KR101035412B1 - X-ray detection method and x-ray detector - Google Patents

Abstract

PURPOSE: An X-ray detecting method and an X-ray detector are provided to improve the accuracy of X-ray detection by measurement from a time point of the application of an electric field on a gas layer to a time point of the collection of electric charge on an electrode. CONSTITUTION: An X-ray detector comprises a pixel(310), an electrode(312), a detection unit(320), a measuring unit(330), and a conversion unit(340). The pixel comprises a gas layer. The electrode creates electric fields on the gas layer. The detection unit senses the electric charge collected in the electrode. The measuring unit measure time from the creation of the electric field to the detection of the electric charge by a detecting unit. The conversion unit changes the time measured by the measuring unit into digital information.

Description

X-ray detection method and X-ray detector {X-RAY DETECTION METHOD AND X-RAY DETECTOR}

The present invention relates to a x-ray detection method.

X-ray (X-ray) detection method currently widely used in medical, engineering, etc. is taken using an X-ray detection film, and undergoes a predetermined film printing step in order to know the result. However, this caused a long time in terms of usability since the photograph of the desired object could be recognized after a certain time, especially when the film itself was damaged due to difficulty in storing and preserving the film after shooting. There was a difficult problem to check.

In order to solve the above problems, a detector for X-ray image detection using a thin film transistor (TFT) has been researched and developed. A detector using a TFT can realize the advantage of using a TFT as a switching element and diagnosing a result in real time immediately after an X-ray is taken. There are an indirect method and a direct method in X-ray signal detection methods that are currently commercialized.

The indirect method converts the irradiated X-rays into visible light and converts the visible light back into an electrical signal, and the direct method refers to converting the irradiated X-rays directly into an electrical signal. The indirect method and the direct method have advantages and disadvantages. However, in the case of the method using the TFT, the detector using the TFT generally has a problem that the large area is difficult, the cost is increased, and the sensitivity is lowered.

In the situation where there is an urgent need for the development of a breakthrough digital imaging device that can solve these problems, a method of using PDP (Plasma Display Panel) as a replacement detector has recently been proposed. The PDP is filled with an inert gas such as Xe or Ne between two substrates on which a plurality of electrodes are formed, and then applies a voltage, and the phosphor formed on the lower plate is excited by ultraviolet rays in the discharge generated by the applied voltage. Refers to an imaging device that obtains text or graphics.

Hereinafter, an X-ray detector and an X-ray detection method using a conventional PDP will be described.

1 is a block diagram of a conventional X-ray detector.

As shown in FIG. 1, the X-ray detector includes a pixel 110 including the gas layer 111, two or more electrodes 112 and 113 for generating an electric field in the gas layer 111, and an amount of charge collected in the electrode. The measurement unit 130 for measuring the value of the charge measured by the measurement unit 130 and the measurement unit 130 to measure the total amount of charge collected by the electrodes 112 and 113 by integrating the charge detected by the detection unit 120 And a converting unit 140 for converting the amount into digital information XIF <0: A>.

An operation of the X-ray detector will be described with reference to FIG. 1.

The pixel 110 refers to a minimum sensing and display unit in the x-ray detector. When the information about the X-ray 101 irradiated by the pixel 110 is converted into an electrical signal and stored as a digital code, the X-ray image may be permanently stored.

The gas layer 111 is generally formed by filling an inert gas such as Xe or Ne between the upper plate and the lower plate in the PDP. When the X-rays 101 are irradiated to the pixel 110, gas molecules forming the gas layer 111 collide with the X-rays 101 to absorb the energy of the X-rays 101 and ionize to electrons and positive ions. do. In this case, the degree of ionization of the gas layer 111 varies according to the irradiation amount of the X-ray 101 or the energy of the X-ray 101.

When the gas layer 111 is ionized, a voltage is applied to at least two electrodes 112 and 113 to collect charges included in the gas layer 111. An electric field is formed between the two or more electrodes 112 and 113 by the applied voltage, and the formed electric field is applied to the gas layer 111. At this time, electric charges formed in accordance with the irradiation of the gas layer 111 by the electric field are collected to each electrode (112, 113) and the detection unit 120 detects this. The formed charges may move with the electric field and collide with gas particles of the gas layer 111 to generate additional charges.

When the collection of charges to the electrodes 112 and 113 is completed, the measurement unit 130 integrates the amount of charges detected by the detector 120 to measure the total amount of charges collected by the electrodes 112 and 113. As described above, the degree of ionization of the gas layer 111 varies depending on the amount of radiation of the X-rays 101 or the energy of the X-rays 101, and as a result, the amount of charge collected on the electrodes 112 and 113 is determined by the amount of radiation of the X-rays 101. Or depends on the energy of the X-rays 101.

The conversion unit 140 converts the amount of charge measured by the measurement unit 130 into digital information XIF <0: A>. Through this process, information about the X-ray 101 irradiated to the pixel may be converted into digital information XIF <0: A> and stored. This digital information (XIF <0: A>) can be permanently preserved and can be represented as an x-ray image whenever necessary.

In general, the X-ray detector includes a plurality of pixels 110. The X-rays 101 irradiated to the plurality of pixels 110 may be detected and converted into digital information and used in various fields including the medical field.

As described above, the X-ray detector using the conventional PDP ionizes the gas molecules of the gas layer 111 by the irradiated X-ray and collects the ionized charges. The digital information XIF <0: A> is then calculated from the amount of collected charges. Hereinafter, a problem that may occur in the above-described method will be described.

2 is a diagram illustrating the amplification degree of a signal according to an electric field applied to the gas layer 111.

The first line 201 shows the degree of amplification of the signal according to the intensity of the electric field when irradiated with X-ray rays having an energy of 1MeV, and the second line 202 shows the intensity of the electric field when irradiated with X-ray rays having an energy of 2MeV. The amplification degree of the signal is shown. Here, the degree of amplification of the signal corresponds to the amount of charges collected in the electrodes 112 and 113 in the description of FIG. 1.

In the first section 203, the degree of amplification of the signal varies according to the energy of the X-ray. In other words, if the amount of X-ray radiation or the energy of the X-ray changes, the degree of amplification of the signal also changes. However, as shown in FIG. 2, the amplification degree of the signal and the energy of the irradiated X-ray do not have a linear relationship but a non-linear relationship.

However, even if the energy of the X-ray energy from the second section 204 is changed, the amplification degree of the signal does not change (in the second section 204, the first line 201 and the second line 202 overlap). .

In general, since the X-rays 101 have strong permeability, the degree of ionization of gas molecules of the gas layer 111 into the X-rays is small. Therefore, the strength of the electric field applied to the gas layer 111 must be increased to increase the amount of charge collected. However, when the intensity of the electric field applied to the gas layer 111 is increased, a problem may occur that the energy difference of the X-rays irradiated with the pixel 110 may not be detected as described above with reference to FIG. 2.

The present invention has been proposed to solve the above problems of the prior art, and an object thereof is to provide an X-ray detection method and an X-ray detector with improved accuracy of X-ray detection.

X-ray detection method according to the present invention for achieving the above object comprises the steps of generating a charge to ionize the gas by the X-ray to be irradiated; Applying an electric field to the gas; Collecting charges generated from the gas; Measuring a time between the point of application of the electric field and the point at which the charge begins to collect; And generating an X-ray image based on the measured time.

The X-ray detection method may further include initializing an ionization state of the gas before the X-rays are irradiated.

In addition, the X-ray detection method according to the present invention for achieving the above object, the method of detecting an X-ray by an X-ray detector including a plurality of pixels, comprising: generating a charge by irradiating the X-rays to the plurality of pixels; Applying an electric field inside the plurality of pixels to detect the irradiated x-rays; Collecting the charge generated in the plurality of pixels to detect the irradiated x-rays; Measuring a time between the time when an electric field is applied inside the plurality of pixels and the time when the charge generated in the plurality of pixels starts to be collected; And generating an X-ray image based on the measured time.

The X-ray detection method may further include initializing the plurality of pixels before the X-rays are irradiated to the plurality of pixels.

In addition, the X-ray detector according to the present invention for achieving the above object, the pixel including a gas layer; Two or more electrodes for generating an electric field in said gas layer; A detector for sensing charge collected in the electrode; And a measuring unit measuring a time from the time of generating the electric field by the two or more electrodes to the time of detecting the electric charge by the detector, wherein the time measured by the measuring unit is the basis of X-ray image generation.

The apparatus may further include a converting unit converting the time measured by the measuring unit into digital information.

The pixel may include a conversion layer that absorbs the X-rays and emits electrons or ultraviolet rays.

The X-ray detection method according to the present invention improves the accuracy of X-ray detection by detecting the irradiated X-ray by measuring from the time of applying the electric field to the gas layer to the time when the charge begins to be collected on the electrode.

1 is a block diagram of a conventional x-ray detector,
2 is amplification degree of the signal according to the electric field applied to the gas layer 111,
3 is a block diagram of an x-ray detector according to an embodiment of the present invention;
4 is a flowchart illustrating an x-ray detection method according to the present invention;
5 is a configuration diagram of a pixel 310 for simulating the performance of the X-ray detector according to the present invention;
6 is a waveform diagram showing changes in voltage V and current density J of the second electrode 502 and the third electrode 503.
7 shows simulation results.

Hereinafter, the most preferred embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the technical idea of the present invention.

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3 is a block diagram of an X-ray detector according to an embodiment of the present invention.

As shown in FIG. 3, the X-ray detector includes a pixel 310 including the gas layer 311, two or more electrodes 312 and 313 and an electrode 312 and 313 for generating an electric field in the gas layer 311. A detector 320 for sensing the collected charges, a measurement unit 330 for measuring the time from the electric field generation time by the two or more electrodes 312 and 313 to the time when the detector 320 detects the charge, and a measurement unit And a converter 340 for converting the time measured by 330 into digital information XIF <0: A>.

An operation of the X-ray detector will be described with reference to FIG. 3.

The pixel 310 refers to a basic unit for converting information about the X-ray 301 irradiated from the X-ray detector into digital information XIF <0: A>. Therefore, when displaying the converted digital information (XIF <0: A>), an X-ray image is generated based on the digital information (XIF <0: A>) collected in the pixel.

Prior to irradiating the X-ray 301 to the pixel 310, an electric field is generated at the electrodes 312 and 313 to initialize the pixel 310. Here, the meaning of initializing the pixel 310 is as follows. For example, consider the case of detecting the X-ray twice in succession using an X-ray detector. After detecting the first irradiated X-ray 301, the charge distribution in the pixel 310 such as the gas layer 311 and the electrodes 312 and 313 may be changed differently from the charge distribution before the X-ray 301 is irradiated. do. In this case, when the second detection operation is performed as it is, the second irradiated X-ray 301 may not be properly detected due to the charge distribution in the changed pixel 310. Therefore, before performing the detection operation and starting the next detection operation, an electric field for returning the electric charge distribution such as the gas layer 311 and the electrodes 312 and 313 to the state before the X-ray 301 is irradiated is applied to the electrodes 312 and 313. Will be applied to.

When the initialization of the pixel 310 is completed, the X-ray 301 is irradiated onto the pixel 310. The gas molecules of the gas layer 311 are ionized by the irradiated X-ray 301 to generate charges in the gas layer 311. In general, the X-rays 301 have a strong permeability and often pass through as they are without ionizing gas molecules. If the ionized gas molecules are too small, the irradiated X-ray 301 may not be properly detected, so that the pixel 310 absorbs the X-ray 301 in order to increase the amount of charge generated in the process of irradiating the X-ray 301. The conversion layer 314 may emit electrons or ultraviolet rays.

The conversion layer 314 generates electrons or ultraviolet rays, visible light, and the like according to the irradiation amount and energy of the irradiated X-ray 301. In the case of electrons, when an electric field is formed in the electrodes 312 and 313, the electrons are collected immediately. In the case of ultraviolet light or visible light, the gas molecules in the gas layer 311 are excited or ionized again, and the generated charges are transferred to the electrodes 312 and 313. Is collected. That is, the conversion layer 314 is a means for increasing the amount of charge generated by the irradiated X-ray 301. The conversion layer 314 for converting the X-ray 301 into an electron hole pair may be any one selected from PbO, HgI ₂ , PbI ₂ , CdS, CdTe, and a-Se (photoconductor), or a combination of two or more thereof. . In addition, the conversion layer 314 for converting the X-ray 301 into electrons may be made of CsI, KI, KBr, and MgO, and the conversion layer 314 for converting the X-ray 301 into ultraviolet light may be formed of LaF ₃ (Nd). have.

When charge is generated in the pixel 310 by the irradiated X-ray 301, an electric field for collecting charges is generated in the electrodes 312 and 313. A predetermined voltage is applied to the electrodes 312 and 313 to generate an electric field. If the voltage applied is a voltage capable of generating a potential difference between the electrodes 312 and 313, a charge may be collected at any voltage. However, the amount of charges generated by ionizing gas molecules of the gas layer 311 by the X-rays 301 irradiated as described above may be less for accurately detecting the X-rays 301. Thus, it is possible to generate an electric field to increase the amount of generated charge while simultaneously generating an electric field for collecting charges.

As one of methods for increasing the generated charge, a method of changing the direction of one or more times of the electric field generated inside the pixel 310 may be used. Since the charge (positive charge reference) moves in the direction of the electric field, changing the direction of the electric field before reaching the electrodes 312 and 313 also changes the direction of movement of the charge. The charge moves and collides with the gas molecules of the gas layer 311 to generate another charge. If the direction of the electric field is continuously changed as described above, the generated charge moves between the electrodes 312 and 313, and the gas of the gas layer 311 is moved. As they continue to collide with the molecule, they generate different charges, which can increase the amount of charge generated. In order to change the direction of the electric field, the voltage applied to the electrodes 312 and 313 may be changed.

The amount of charge generated through the above-described process is related to the dose and energy of the irradiated X-ray 301. The greater the irradiation amount of the X-ray 301, and the greater the energy of the irradiated X-ray 301, the more electric charges are generated in the pixel 310. The generated charges are collected by the electric fields generated by the electrodes 312 and 313 to the electrodes 312 and 313, and the detector 320 detects the electric charges thus collected. Since the current density of the electrodes 312 and 313 changes when the charges are collected, the charges collected by the electrodes 312 and 313 may be detected by changing the current density of the electrodes 312 and 313.

The measurement unit 330 generates an electric field for collecting charges generated by the X-rays 301 irradiated to the electrodes 312 and 313, and starts to collect the generated charges in the electrodes 312 and 313. Measure the time until. That is, starting from the point where the voltage for generating the electric field is applied to the electrodes 312 and 313, the point at which the change occurs in the current density of the electrodes 312 and 313 (hereinafter referred to as 'measurement interval') Just measure the time. In this case, the end may not be clearly specified (the time at which the collection is started may be difficult to detect because the change in current density is too small), and another time may be defined as the end. For example, it is possible to measure the time of the 'measurement interval' by defining the end point when the current density reaches 10% of the peak value. Similar to the total charges collected at the electrodes 312 and 313, the time of the 'measurement interval' is related to the dose and energy of the irradiated X-ray 301.

The conversion unit 340 converts the time of the 'measurement interval' into digital information XIF <0: A>. For conversion, it is measured how it changes in time of the 'measurement interval' according to the dose and energy of the X-ray 301 irradiated through experiment in advance and applies it to the conversion operation of the conversion unit 340. The digital information (XIF <0: A>) can be stored and displayed as an X-ray image.

The X-ray detector according to the present invention is characterized by different measurement parameters for detecting the X-ray 301.

4 is a flowchart illustrating an x-ray detection method according to the present invention.

As shown in FIG. 4, the X-ray detection method includes initializing an ionization state of a gas (which is a gas constituting the gas layer 311) before the X-ray is irradiated (S401), and gas is ionized by the irradiated X-ray. Step (S402), applying an electric field to the gas (S403), collecting the charge generated from the gas (S404), measuring the time between the time when the charge starts to be collected from the application of the electric field (S405) ), And the time between the start of charge collection from the point of application of the electric field and the time between the dose of irradiated X-rays and the start of charge from the point of application of the electric field as digital information (XIF <0: A>). And converting (S406).

Hereinafter, an X-ray detection method will be described with reference to FIGS. 3 and 4.

Before the X-ray 301 is irradiated, the ionization state of the gas molecules of the gas is initialized (S401). Initialization means returning the ionized state of the gas to the state before the X-ray 301 is irradiated. This is so that the result of the detection operation is not affected by the previous detection operation. This is because when the X-ray 301 is irradiated again while the charge of the gas layer is disturbed by the previous operation, the information about the irradiated X-ray 301 may be incorrectly measured. Initialization of the gas is performed by applying an electric field for initialization to the gas layer 310 (initialization step).

When the initialization (S401) is completed, the X-ray 301 is irradiated to the gas layer 311 to ionize the gas to generate a charge (S402). The amount of charge generated increases as the dose and energy of the irradiated X-ray 301 increases. In this case, the amount of generated charge may be increased for accurate measurement. For this purpose, the conversion layer 314 that absorbs the X-ray 301 and emits electrons or ultraviolet rays may be used (the X-ray irradiation step).

When the charge is generated, an electric field is applied to the gas to collect the generated charge (S403). When a predetermined voltage is applied to the electrodes 312 and 313 to apply an electric field, the time point at which the electric fields are applied to the electrodes 312 and 313 is the start of the measurement section. At this time, the direction of the electric field applied to the gas may be changed more than once to increase the amount of charge generated as in the charge generation step (S402). The generated charges are moved up and down between the gas layers 311 to collide with gas molecules to generate other charges (electric field applying step).

When the electric field is applied, the charges generated in the charge generation step S402 are moved to the electrodes 312 and 313 (S404). At this time, positive charges (positive ions) move in the direction of the electric field, and electrons move in the opposite direction of the electric field and are collected by the electrodes 312 and 313, respectively (charge collection step).

When the electric charge starts to be collected, the electric charge is collected at the time when the electric field is applied to the gas layer 311 by the electrodes 312 and 313 in the electric field applying step S403 and the electrodes 312 and 313 in the electric charge collecting step S404. The time between the start time points (time of the 'measurement section') is measured (time measurement step, S405). Strictly speaking, since the time of the 'measurement interval' is measured at the stage where the generated charge starts to be collected, the charge collection step (S404) and the time measurement step (S405) can be considered to be performed simultaneously without temporal relationship. From the point of view of cause and effect, it is logically reasonable to first collect charges and measure time measurements.

The time of the 'measurement interval' thus measured is converted into digital information (XIF <0: A>) (S406). The converted digital information (XIF <0: A>) is stored as a digital code and can be displayed as an X-ray image if necessary (information conversion step).

When the above-described step is considered to be applied to a general X-ray detector including a plurality of pixels 310 as follows.

 In the method for detecting an X-ray by the X-ray detector including a plurality of pixels 310, the step of initializing the plurality of pixels 310 before the X-ray 301 is irradiated to the plurality of pixels (310), Generating a charge by irradiating the plurality of pixels 310 with the X-ray 301 (S402), applying an electric field inside the plurality of pixels 310 to detect the irradiated X-rays 301 (S403), Collecting charges generated in the plurality of pixels 310 to detect the irradiated X-ray 301 (S404), generated in the plurality of pixels 310 from the time when an electric field is applied to the plurality of pixels 310 Measuring the time between the time points at which the collected charges start to be collected (S405), and the time point at which the charges generated in the plurality of pixels 310 start to be collected from the time point at which the electric field is applied to the plurality of pixels 310. Converting the time of the digital data into digital information XIF <0: A> (S4). 06).

Each step of the X-ray irradiation method described above is the same as described above in the description of FIG. 4. However, in the initialization step S401, the meaning of initialization may be expanded. In FIG. 4, the initialization of the ionization state of the gas layer 311 before the X-ray 301 is defined as initialization. However, in a wide range of initialization, X-rays 301 may be used to determine the state of a plurality of pixels 310 such as the gas layer 311, the electrodes 312 and 313, and the conversion layer 314 included in the plurality of pixels 310 of the X-ray detector. ) Means returning to the state before irradiation, where the central meaning of the state corresponds to the state of charge distribution. This is to prevent the result of the X-ray detection operation from being affected by the result of the previous X-ray detection operation as described above.

For reference, the time (hereinafter referred to as T _parameter ) of the measurement parameter 'measurement interval' may be expressed as T _parameter = T ₁ (start time) + T ₂ (delay time). T ₁ and T ₂ are the structure of the pixel (distance between electrodes), the intensity of the applied electric field and the mobility of the generated charge (μ: mobility), the collision of charge with the initial charge amount (n ₀ ) in the space of the pixel 310 It is influenced by the generation rate (G: Gain) in which new charge is generated.

The X-ray detection method according to the present invention differs from the conventional X-ray detection method by measuring parameters. In the conventional case, the X-ray 301 is detected using the total amount of collected charges. However, in the present invention, the X-ray is detected by measuring the time from when the electric field is applied to the gas to the time when the generated charge starts to be collected. This method is more linear in relation to the amount of charge generated than the conventional method. Since the generated charge amount is related to the irradiation amount and energy of the irradiated X-ray 301, when the linearity between the generated charge amount and the measurement parameter is improved, the Detective Quantum Efficiency (DQE) and the Signal to Noise Ratio (SNR) of the pixel 310 are reduced. There is an advantage to increase.

5 is a block diagram of a pixel 310 for simulating the performance of the X-ray detector according to the present invention.

Pixel 310 for simulation is composed of a first electrode 501, a second electrode 502, a third electrode 503, a first dielectric 504, a second dielectric 505, the size of each part 5 is shown. The space 506 between the first dielectric 504 and the second dielectric 505 corresponds to the gas layer 311. The first electrode 501 is not used. After the voltage is applied to the second electrode 502 and the third electrode 503, the change in the total amount of charge collected by the second electrode 502 and the third electrode 503 (hereinafter referred to as 'P1') and the measurement period Measure the time of '(' P2 '). After the measurement, the change of the two parameters is observed while varying the initial charge amount n ₀ inside the pixel 310.

The initial charge amount n ₀ inside the pixel 310 changes according to the irradiation amount and energy of the X-ray 301 irradiated to the pixel 310. Accordingly, the change of the two parameters' P1 'and' P2 'according to the change of the initial charge amount n ₀ inside the pixel 310 is measured. As a result, the measurement parameters'P1',' You can see how sensitively P2 'changes.

FIG. 6 is a waveform diagram illustrating changes in voltage V and current density J of the second electrode 502 and the third electrode 503.

In order to measure 'P1', a voltage for generating an electric field in the space 506 is applied to the second electrode 502 in the first section 601 and the current density J of the third electrode 503 is measured. To integrate it. In order to measure 'P2', a voltage for generating an electric field in the space 506 is applied to the second electrode 502, and the third electrode 503 starts at the time when the voltage is applied to the second electrode 502. The time T of the second section 602, starting at the point where the charge begins to collect, must be measured. The first section 601 is 0.5 s.

The direction of the electric field applied to the space 506 is changed once to increase the amount of charge collected. The direction of the electric field is determined by the voltage V applied to the second electrode 502 and the third electrode 503. At the change point 603, the polarity of the voltage applied to the second electrode 502 is changed to reverse the direction of the electric field applied to the space 506. The charge generated through this process collides with the gas molecules of the gas layer 311 to generate another charge.

The first vertical axis 604 represents the current density J of the second electrode 502 and the third electrode 503, and the second vertical axis 605 represents the second electrode 502 and the third electrode 503. The voltage V is shown.

7 is a diagram illustrating a simulation result.

The horizontal axis 701 represents the initial charge amount n ₀ inside the pixel 310, the first vertical axis 702 represents the current density J, and the second vertical axis 703 represents the time T. The first line 702 changes the 'P1' according to the change of the initial charge amount n ₀ in the pixel 310, and the second line 703 changes the initial charge amount n ₀ in the pixel 310. It shows the change of 'P2'.

From the simulation results, it can be seen that 'P2' has a linear relationship with the initial charge amount n ₀ inside the pixel 310 rather than 'P1'. This simulation result means that 'P2' (the time between the start of charge collection from the point of application of the electric field) is a more effective parameter for detecting the dose and energy of the irradiated X-ray 301 as described above. will be.

Therefore, the x-ray detection method and the x-ray detector according to the present invention improves the performance of the x-ray detection method and the x-ray detector by different measurement parameters for detecting the dose and energy of the irradiated x-ray 301.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

Claims (14)

Generating a charge in which the gas is ionized by the irradiated x-ray;
Applying an electric field to the gas;
Collecting charges generated from the gas;
Measuring a time between the point of application of the electric field and the point at which the charge begins to collect; And
Generating an x-ray image based on the measured time
X-ray detection method comprising a.
The method of claim 1,
And initializing an ionization state of the gas before the X-rays are irradiated.
The method of claim 1,
Converting the time between the point of application of the electric field and the point at which the charge begins to be collected into information about the irradiated x-ray. The method of claim 3, wherein
The x-ray information is digital information X-ray detection method.
The method of claim 1,
And changing the direction of the electric field applied to the gas at least once in the step of applying the electric field to the gas.
In the method for detecting an x-ray by an x-ray detector comprising a plurality of pixels,
Irradiating the X-rays to the plurality of pixels to generate charges;
Applying an electric field inside the plurality of pixels to detect the irradiated x-rays;
Collecting the charge generated in the plurality of pixels to detect the irradiated x-rays;
Measuring a time between the time when an electric field is applied inside the plurality of pixels and the time when the charge generated in the plurality of pixels starts to be collected; And
Generating an x-ray image based on the measured time
X-ray detection method comprising a.
The method of claim 6,
And initializing the plurality of pixels before the X-rays are irradiated to the plurality of pixels.
The method of claim 6,
And converting time between the time point at which the electric field is applied to the plurality of pixels from the time point at which the charge generated in the plurality of pixels starts to be collected into digital information.
The method of claim 6,
And changing the direction of the electric field one or more times in the step of applying an electric field inside the plurality of pixels to detect the irradiated X-rays.
A pixel comprising a gas layer;
Two or more electrodes for generating an electric field in said gas layer;
A detector for sensing charge collected in the electrode; And
A measurement unit for measuring a time from when the electric field is generated by the two or more electrodes to the time when the detection unit detects the charge
Including but the time measured by the measuring unit is the x-ray detector that is the basis of the X-ray image generation.
The method of claim 10,
The two or more electrodes,
Generating an electric field for initializing the pixel before the pixel is irradiated with X-rays,
An x-ray detector generating an electric field for collecting the charge after the pixel is irradiated with the x-ray.
12. The method of claim 11,
And the electric field generated inside the pixel by the two or more electrodes after the X-ray is irradiated to the pixel is changed in direction more than once.
The method of claim 10,
And the pixel includes a conversion layer for absorbing the x-rays to emit electrons or ultraviolet rays.
The method of claim 10,
And a conversion unit for converting the time measured by the measurement unit into digital information.

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