A resistive plate detector that reads positive and negative signals using differential amplifiers.

Abstract

A resistive plate detector, which reads positive and negative signals using differential amplifiers, includes a plurality of first positive (+) signal strips formed in the shape of strips extending in a first direction on a first surface of a first substrate and arranged in parallel; a plurality of first negative (-) signal strips formed in the same shape as the first positive signal strips on a second surface of the first substrate opposite to the first surface, facing each corresponding first positive signal strip in a pair and arranged parallel to the first direction; and a plurality of first ground strips formed in the same shape between the plurality of first positive signal strips and the plurality of first negative signal strips and arranged parallel to the first direction. The output signals of the corresponding pair of first positive signal strips and first negative signal strips are input to a single differential amplifier. In this invention, since the ground strips are rectangular in shape, or a variation thereof, like the signal strips, noise in the resistive plate detector can be reduced and performance can be improved.

Description

Technical Field

[0001] The present invention relates to a resistive plate detector for decoding signals using a strip pair, and more particularly to a technique for reducing the load and noise of a resistive plate detector applied to TOF (Time-of-flight) PET (Positron Emission Tomography).

[0002] [Cross-reference to related applications] The present invention claims the priority of Korean Patent Application No. 10-2023-0102167 filed on August 4, 2023, the entire contents of which are incorporated herein by reference.

Background Art

[0003] A positron emission tomography machine (hereinafter, PET; Positron Emission Tomography) injects a pharmaceutical combined with a radioactive isotope that emits positrons into the body, and then tracks the emission position of the positrons from the outside of the human body using a detector.

[0004] According to such tracking, by investigating the activity of the pharmaceutical injected into the body within the body, the state of the patient can be investigated in a non-invasive manner. Therefore, PET technology is widely used in various medical examinations for grasping the state of a patient's cancer, heart disease, brain disease, brain function, etc.

[0005] In PET, a positron emitted from a radioactive substance injected into the body collides with surrounding electrons and annihilates, and two gamma rays emitted in almost 180° directions are observed, data corresponding to the line integral of the positron distribution is obtained, and a positron distribution image is calculated using that data.

[0006] Specifically, if two PET detectors detect gamma rays from the same positron-electron collision at times t1 and t2, it means that one positron lies on the response line (LOR) connecting the two detectors, and therefore the line integral of the positron distribution along that response line can be obtained.

[0007] Methods widely used to calculate distribution images from the aforementioned line integral values ​​include the filtered backprojection (FBP) method and the expectation-maximization (EM) method.

[0008] Methods to more accurately estimate the position of positrons in the LOR using time-of-flight (TOF) t=t1-t2 information observed by the detector, and to improve image reconstruction, have been studied since the early stages of PET development, but this was difficult to achieve with the low temporal resolution of PET at the time.

[0009] Improvements in PET-related technologies since the 2000s have made it possible to apply temporal resolution to image reconstruction. Currently, methods such as pixel-based imaging are used to acquire signals from resistive plate detectors that have high temporal resolution.

[0010] However, when attempting to obtain a desired positional resolution on a plane using a resistive plate detector, the pixel method requires a very large number of channels (n∝x×y), resulting in problems of high load and noise. [Overview of the project] [Problems that the invention aims to solve]

[0011] Therefore, the technical problem of the present invention is focused on these points, and the present invention aims to provide a resistive plate detector that reads positive and negative signals with differential amplifiers in order to reduce load and noise. [Means for solving the problem]

[0012] A resistive plate detector according to one embodiment for realizing the object of the present invention described above, which reads positive and negative signals with differential amplifiers, includes a plurality of first positive (+) signal strips formed in the shape of strips extending in a first direction on a first surface of a first substrate and arranged in parallel; a plurality of first negative (-) signal strips formed in the same shape as the first positive signal strips on a second surface of the first substrate opposite to the first surface, facing each corresponding first positive signal strip in a pair and arranged in parallel in the first direction; and a plurality of first ground strips formed in the same shape between the plurality of first positive signal strips and the plurality of first negative signal strips and arranged in parallel in the first direction, wherein the output signals of the corresponding pair of first positive signal strips and first negative signal strips are input to a single differential amplifier.

[0013] In embodiments of the present invention, the plurality of first positive signal strips, the plurality of first negative signal strips, and the plurality of first ground strips may each be formed to have the same shape, the same width, the same length, the same thickness, and the same spacing.

[0014] In embodiments of the present invention, the plurality of first positive signal strips, the plurality of first negative signal strips, and the plurality of first ground strips may be formed to have the same shape, the same width, the same length, the same thickness, and the same spacing from one another.

[0015] In embodiments of the present invention, each of the first positive signal strip and the first negative signal strip may have at least one resistive element and at least one capacitive element connected to both ends.

[0016] In embodiments of the present invention, the widths and spacing of the plurality of first positive signal strips and the plurality of first negative signal strips may be adjusted according to the target input impedance of the differential amplifier.

[0017] In embodiments of the present invention, a resistive plate detector that reads positive and negative signals with differential amplifiers may further include: a plurality of second positive signal strips formed in strip shape on the first surface of a second substrate, which is separated by a predetermined distance from the first surface of the first substrate and arranged in parallel; a plurality of second negative signal strips formed in the same shape as the second positive signal strips on the second surface of the second substrate, which is opposite to the first surface, and arranged in parallel, facing each corresponding second positive signal strip in pairs; and a plurality of second ground strips formed in the same shape and arranged in parallel between the plurality of second positive signal strips and the plurality of second negative signal strips.

[0018] In embodiments of the present invention, the plurality of second positive signal strips, the plurality of second negative signal strips, and the plurality of second ground strips may extend in a second direction perpendicular to the first direction.

[0019] In embodiments of the present invention, the output signals of a corresponding pair of second positive and second negative signal strips are input to a differential amplifier, and the widths and spacing of the multiple second positive and second negative signal strips may be adjusted according to the target input impedance of the differential amplifier.

[0020] In embodiments of the present invention, each of the plurality of first positive signal strips, plurality of first negative signal strips, plurality of second positive signal strips, plurality of second negative signal strips, plurality of first ground strips, and plurality of second ground strips may have at least one of the following forms: rectangular, rectangular with both ends narrowing in a triangular shape, and rectangular with one end narrowing diagonally.

[0021] In embodiments of the present invention, a resistive plate detector that reads positive and negative electrode signals using differential amplifiers may be applied to TOF (Time-of-flight) PET (Positron Emission Tomography). [Effects of the Invention]

[0022] According to such a resistive plate detector that differentially amplifies the positive and negative signals respectively, the signal load and noise can be reduced, and the performance of the applied TOF-PET can be improved.

Brief Description of the Drawings

[0023] [Figure 1] It is a schematic perspective view for explaining a resistive plate detector that differentially amplifies the positive and negative signals respectively according to an embodiment of the present invention. [Figure 2] It is a specific perspective view of the resistive plate detector of FIG. 1. [Figure 3] It is a cross-sectional circuit diagram showing an example of the resistive plate detector of FIG. 2. [Figure 4] It is a planar circuit diagram showing an example of the resistive plate detector of FIG. 2. [Figure 5] It is a diagram showing an example of the strip form of FIG. 2. [Figure 6] It is a diagram showing an example of the strip form of FIG. 2. [Figure 7] It is a diagram showing an example of the strip form of FIG. 2. [Figure 8] It is a schematic plan view of the resistive plate detector of FIG. 2.

Modes for Carrying Out the Invention

[0024] The detailed description of the present invention, as described below, will be made with reference to the accompanying drawings illustrating examples of specific embodiments for carrying out the present invention. These embodiments will be described in detail so that those skilled in the art will be able to fully implement the present invention. The embodiments of the present invention are distinct but should be understood not to be mutually exclusive. For example, the specific shapes, structures and characteristics described herein relate to one embodiment but can be realized in other embodiments without departing from the spirit and scope of the present invention. Furthermore, the position or arrangement of individual components in each disclosed embodiment should be understood not to be departing from the spirit and scope of the present invention. Thus, the detailed description described below is not to be used in a restrictive sense, and the scope of the present invention, as appropriately described, includes all equivalents to those claimed in the claims and is limited only by the claims. Similar reference numerals in the drawings indicate identical or similar functions in various respects.

[0025] When we say that an element or layer is "on" or "above" another element or layer, this includes not only those directly above a different element or layer, but also those with other layers or elements in between. In contrast, when we say that an element is "directly on" or "directly above," it indicates that there are no other elements or layers in between.

[0026] Spatially relative terms such as "below," "beneath," "lower," "above," and "upper" are used to facilitate the description of the correlation between one element or component and other elements or components, as shown in the diagram. Spatially relative terms should be understood to include different orientations of the element during use or operation, in addition to the orientation shown in the diagram. For example, if an element shown in the diagram is flipped over, an element mentioned as being "below" or "beneath" another element becomes "above" the other element. Therefore, the illustrative term "below" includes both the downward and upward directions. Since elements can also be oriented in other directions, spatially relative terms are interpreted according to that orientation.

[0027] Even if terms such as "first," "second," etc., are used to indicate various elements, components, and / or sections, it goes without saying that these elements, components, and / or sections are not limited by those terms. These terms are simply used to distinguish one element, component, or section from other elements, components, or sections. Therefore, it goes without saying that the first element, first component, or first section described later may also be the second element, second component, or second section within the technical concept of the present invention.

[0028] The terms used herein are for illustrative purposes only and do not limit the invention. In this specification, the singular includes the plural unless otherwise specified. Where the terms “comprises” and / or “comprising” are used in the specification, the components, steps, operations and / or elements referred to are not excluded from the presence or addition of one or more other components, steps, operations and / or elements.

[0029] Unless otherwise specified, all terms used herein (including technical and scientific terms) are used in a sense that is commonly understood by those with ordinary skill in the art to which the present invention pertains. Furthermore, terms defined in commonly used dictionaries should not be interpreted ideally or excessively unless otherwise specified.

[0030] Embodiments of the present invention will be described in detail below with reference to the attached drawings. When describing with reference to the attached drawings, the same or corresponding components will be denoted by the same reference numerals regardless of the drawing number, and redundant descriptions will be omitted.

[0031] Preferred embodiments of the present invention will be described in more detail below with reference to the drawings.

[0032] Figure 1 is a schematic perspective view illustrating a resistive plate detector according to one embodiment of the present invention, in which positive and negative signals are read by differential amplifiers, respectively. Figure 2 is a specific perspective view of the resistive plate detector of Figure 1.

[0033] The resistive plate detector 1 according to the present invention is a device that outputs a signal for detecting the position of a positron when applied to TOF-PET (Time-of-flight Positron Emission Tomography). The resistive plate detector 1 may be a separate device from the TOF-PET, or it may be a module of the device.

[0034] As shown in Figures 1 and 2, the resistance plate detector 1 according to the present invention includes a plurality of positive (+) signal strips 110 and a plurality of negative (-) signal strips 130 arranged in pairs on both sides of a first substrate 10, and a plurality of ground strips 120 corresponding to the space between the positive signal strips 110 and the negative signal strips 130.

[0035] Multiple first positive signal strips 110, multiple first negative signal strips 130, and multiple first ground strips 120 extend in one direction (the first direction) and are arranged in parallel.

[0036] The output signals of a pair of first positive signal strips 110 and first negative signal strips 130 are each used as inputs to a differential amplifier. The width and spacing of the multiple first positive signal strips 110 and multiple first negative signal strips 130 are adjusted according to the target input impedance of the differential amplifier.

[0037] In the present invention, the multiple first grounding strips 120 are in the form of strips rather than a single planar shape, and the signal flows linearly along the grounding strips without spreading widely from the ground, thereby reducing interference between channels and reducing signal noise.

[0038] For convenience, the first substrate 10 is referred to as the x-plane, and the second substrate 30 is referred to as the y-plane. The first substrate 10 has a first surface 11 and a second surface 13 on the opposite side, and the second substrate 30 has a first surface 33 and a second surface 31 on the opposite side.

[0039] For example, the first substrate 10 and the second substrate 30 are PCB (Printed Circuit Board) substrates with a predetermined thickness d and a dielectric constant ε. The first substrate 10 and the second substrate 30 may be single-layer or multi-layer. Furthermore, the first substrate 10 and the second substrate 30 are formed parallel to each other with a predetermined distance D between them.

[0040] In this invention, the upper surface of the first substrate 10 is referred to as the first surface 11, and the lower surface is referred to as the second surface 13. Furthermore, the lower surface of the second substrate 30, which faces the first surface 11 of the first substrate 10, is referred to as the first surface 33, and the upper surface of the second substrate 30 is referred to as the second surface 31. However, these are illustrative examples for the sake of explanation, and the top, bottom, left, and right orientations of the substrates or surfaces may be changed as needed, depending on their position and selection.

[0041] Multiple first positive electrode signal strips 110 are formed in the shape of strips extending in the x-axis direction on the first surface 11 of the first substrate 10 and are arranged in parallel.

[0042] Multiple first positive electrode signal strips 110 are formed in the shape of an elongated rectangle or a modified form thereof, and are formed to be the same shape, the same width w, the same length l, and the same thickness t as each other. Furthermore, multiple first positive electrode signal strips 110 are formed at the same intervals on the first surface 11 of the first substrate 10.

[0043] For example, the width w of the first positive signal strip 110 is 4 mm, the length l of the first signal strip 110 is 160 mm, the thickness t of the first signal strip 110 is 0.5 oz, and the spacing of the first signal strip 110 is 1 mm. However, these sizes may be modified depending on the design.

[0044] Multiple first negative signal strips 130 are formed on the second surface 13 of the first substrate 10 in the same shape as multiple first positive signal strips 110, and are arranged to face each corresponding first positive signal strip in pairs.

[0045] In other words, the first positive electrode signal strip 110 and the first negative electrode signal strip 130 formed on the first substrate 10 are matched one-to-one and formed corresponding to each other on opposite sides of their overlapping positions. For example, there are a total of 32 pairs of corresponding first positive electrode signal strips 110 and first negative electrode signal strips 130, forming 32 channels.

[0046] Similarly, multiple first negative electrode signal strips 130 are formed in the shape of strips extending in the x-axis direction on the second surface 13 of the first substrate 10 and are arranged in parallel.

[0047] Multiple first negative electrode signal strips 130 are formed in the shape of an elongated rectangle or a modified form thereof, and are formed to be the same shape, the same width w, the same length l, and the same thickness t as each other. Furthermore, multiple first negative electrode signal strips 130 are formed at equal intervals on the second surface 13 of the first substrate 10.

[0048] Multiple first grounding strips 120 are formed in the shape of strips extending in the x-axis direction inside the first substrate 10 and are arranged in parallel.

[0049] The multiple first grounding strips 120 are formed in the shape of an elongated rectangle or a variation thereof, and are formed to be the same shape, the same width w, the same length l, and the same thickness t as each other. Furthermore, the multiple first grounding strips 120 are formed at equal intervals.

[0050] In one embodiment, the first positive signal strip 110, the first negative signal strip 130, and the first ground strip 120 formed on the first substrate 10 are all formed to overlap with the same shape and size in the x-axis direction.

[0051] In this embodiment, for convenience, a configuration in which a plurality of first positive signal strips 110 are formed on the first surface 11 of the first substrate 10 and a plurality of first negative signal strips 130 are formed on the second surface 13 of the first substrate 10 has been described. However, conversely, a plurality of first positive signal strips 110 may be formed on the second surface 13 and a plurality of first negative signal strips 130 may be formed on the first surface 11.

[0052] In one embodiment, the second substrate 30 further includes a plurality of second positive signal strips 330 and a plurality of second negative signal strips 310 formed on opposite sides.

[0053] Similarly, a second ground strip 320 is formed between the corresponding second positive signal strip 330 and the second negative signal strip 310.

[0054] Multiple second positive signal strips 330, multiple second negative signal strips 310, and multiple second ground strips 320 extend in one direction (the second direction) and are arranged in parallel.

[0055] In one embodiment, the plurality of second positive electrode signal strips 330, the plurality of second negative electrode signal strips 310, and the plurality of second ground strips 320 formed on the second substrate 30 are formed in a second direction which is perpendicular to the first direction.

[0056] The output signals of a pair of second positive signal strips 330 and second negative signal strips 310 are each used as inputs to a differential amplifier. The width and spacing of the multiple second positive signal strips 330 and multiple second negative signal strips 310 are adjusted according to the target input impedance of the differential amplifier.

[0057] The multiple second positive signal strips 330 are formed in the same way as the multiple first positive signal strips 110, in the form of an elongated rectangle or a variation thereof, and are formed to be the same shape, the same width w, the same length l, and the same thickness t as each other. Furthermore, the multiple second positive signal strips 330 are formed at the same intervals on the first surface 33 of the second substrate 30.

[0058] In one embodiment, the plurality of second positive signal strips 330 are formed to have the same shape, the same width w, the same length l, and the same thickness t as the plurality of first positive signal strips 110.

[0059] Multiple second negative signal strips 310 are formed on the second surface 31 of the second substrate 30 in the same shape as multiple second positive signal strips 330, and are arranged to face each corresponding second positive signal strip 330 in pairs.

[0060] In other words, the second positive signal strip 330 and the second negative signal strip 310 formed on the second substrate 30 are matched one-to-one and formed corresponding to each other on opposite sides of the overlapping position. For example, there are a total of 32 pairs of corresponding second positive signal strips 330 and second negative signal strips 310, forming 32 channels.

[0061] Similarly, multiple second negative electrode signal strips 310 are formed in the shape of strips extending in the y-axis direction on the second surface 31 of the second substrate 30 and are arranged in parallel.

[0062] Multiple second negative electrode signal strips 310 are formed in the shape of an elongated rectangle or a modified thereof, and are formed to be the same shape, the same width w, the same length l, and the same thickness t as each other. Furthermore, multiple second negative electrode signal strips 310 are formed at equal intervals on the second surface 31 of the second substrate 30.

[0063] In one embodiment, the plurality of second negative electrode signal strips 310 are formed to have the same shape, the same width w, the same length l, and the same thickness t as the plurality of first negative electrode signal strips 130.

[0064] Multiple second grounding strips 320 are formed in the shape of strips extending in the y-axis direction inside the second substrate 30 and are arranged in parallel.

[0065] The multiple second grounding strips 320 are formed in the shape of an elongated rectangle or a variation thereof, and are formed to be the same shape, the same width w, the same length l, and the same thickness t as each other. Furthermore, the multiple second grounding strips 320 are formed at equal intervals.

[0066] In one embodiment, the plurality of second grounding strips 320 are formed to have the same shape, the same width w, the same length l and the same thickness t as the plurality of first grounding strips 120.

[0067] In one embodiment, the second positive signal strip 330, the second negative signal strip 310, and the second ground strip 320 formed on the second substrate 30 are all formed to overlap with the same shape and size in the y-axis direction.

[0068] In this embodiment, for convenience, a configuration in which a plurality of second positive signal strips 330 are formed on the first surface 33 of the second substrate 30 and a plurality of second negative signal strips 310 are formed on the second surface 31 of the second substrate 30 has been described. However, the opposite configuration may also be used, where a plurality of second positive signal strips 330 are formed on the second surface 31 and a plurality of second negative signal strips 310 are formed on the first surface 33.

[0069] Figure 3 is a cross-sectional circuit diagram showing an example of the resistive plate detector in Figure 2, and Figure 4 is a planar circuit diagram showing an example of the resistive plate detector in Figure 2.

[0070] Figures 3 and 4 show the first substrate 10 as a representative example, but the second substrate 30 has the same configuration. This is also true in the following explanation.

[0071] As shown in Figures 3 and 4, each of the first positive signal strip 110 and the first negative signal strip 130 is connected to at least one resistor and at least one capacitor at both ends.

[0072] Specifically, a capacitor C11 and a resistor R11 are connected to one end of the first positive signal strip 110, and a capacitor C12 and a resistor R12 are connected to the other end. Also, a capacitor C21 and a resistor R21 are connected to one end of the first negative signal strip 130, and a capacitor C22 and a resistor R22 are connected to the other end.

[0073] Figures 3 and 4 show the first positive signal strip 110 and the first negative signal strip 130, but the second positive signal strip 330 and the second negative signal strip 310 are similarly connected to resistors and capacitors. In addition, two or more resistors or capacitors may be connected, and their positions can be changed.

[0074] Figures 5 through 7 show examples of the strip configuration shown in Figure 2.

[0075] In the present invention, the first positive electrode signal strip 110 is a rectangular shape that extends long in one direction, or a modified form thereof.

[0076] Figure 5 shows the first positive electrode signal strip 110 in a rectangular shape, and Figure 7 shows the first positive electrode signal strip 110 in a shape where one end is narrowed at an angle.

[0077] Figure 7 shows a design where both ends narrow in a triangular shape. In this case, the refraction caused by the change in width when the signal is transmitted to the trace can be reduced.

[0078] Figures 5 to 7 show the first positive signal strip 110 as a representative example, but the first negative signal strip 130, the first ground strip 120, the second positive signal strip 330, the second negative signal strip 310, and the second ground strip 320 are similar.

[0079] Figure 8 is a schematic plan view of the resistive plate detector shown in Figure 2.

[0080] As shown in Figure 8, the first substrate 10 and the second substrate 30 each further include connectors. The connectors are formed on the extensions of the first substrate 10 and the second substrate 30, but the positions shown in Figure 8 are illustrative, and the design can be freely modified to change their positions.

[0081] Capacitors C11, C12, C21, C22, resistors R11, R12, R21, R22, etc., formed at both ends of the signal strip are connected to a differential amplifier (not shown). The differential amplifier, capacitors C11, C12, C21, C22, resistors R11, R12, R21, R22, etc., are formed on connectors formed on the first substrate 10 and the second substrate 30.

[0082] The width and spacing of the signal strips are adjusted according to the target input impedance of the differential amplifier.

[0083] In a resistive plate detector that interprets positive and negative signals using differential amplifiers, the ground strip is formed separately, similar to a signal strip, thus reducing interference between channels. Therefore, noise in the resistive plate detector can be reduced, improving the performance of the TOF-PET to which it is applied.

[0084] Although the invention has been described above based on embodiments, those skilled in the art will understand that the invention can be modified and altered in various ways without departing from the spirit and scope of the invention as described in the claims. [Industrial applicability]

[0085] Positron emission tomography (PET), initially limited to applications such as Parkinson's disease research, operates on a crystal scintillator and optical amplifier. This device is increasingly being used for cancer diagnosis. While time-based PET (TOF-PET) and whole-body PET, which combine time measurement capabilities, have been developed, these are extremely expensive devices.

[0086] In recent years, the possibility of inexpensively fabricating high-performance TOF-PET systems by replacing crystal scintillators and optical amplifiers with resistive plate detectors has been demonstrated. Therefore, it is expected that applying the resistive plate detector of the present invention to TOF-PET systems will enable the inexpensive fabrication of high-performance equipment. [Explanation of Symbols]

[0087] 1. Resistive plate detector 10 First substrate 30 Second circuit board 11 First surface of the first substrate 13 Second surface of the first substrate 31 The second surface of the second substrate 33 First surface of the second substrate 110 First positive signal strip 130 First negative signal strip 120 First ground strip 310 Second negative signal strip 330 Second positive signal strip 320 Second grounding strip

Claims

1. A plurality of first positive (+) signal strips are formed in the shape of strips extending in a first direction on a first surface of a first substrate and arranged in parallel, A plurality of first negative (-) signal strips are formed on the second surface of the first substrate, opposite to the first surface, in the same shape as the first positive signal strip, facing each corresponding first positive signal strip in a pair, and arranged parallel to the first direction. It includes a plurality of first positive signal strips and a plurality of first negative signal strips, each formed in the same shape and arranged parallel to a first direction, The output signals of a corresponding pair of first positive signal strips and first negative signal strips are input to a single differential amplifier. A resistive plate detector that reads positive and negative signals using differential amplifiers.

2. Multiple first positive signal strips, multiple first negative signal strips, and multiple first ground strips are each formed to have the same shape, the same width, the same length, the same thickness, and the same spacing. A resistor plate detector that reads the positive and negative signals according to claim 1 using differential amplifiers, respectively.

3. Multiple first positive signal strips, multiple first negative signal strips, and multiple first ground strips are formed to have the same shape, the same width, the same length, the same thickness, and the same spacing from one another. A resistor plate detector that reads the positive and negative signals according to claim 1 using differential amplifiers, respectively.

4. Each of the first positive signal strip and the first negative signal strip is connected to at least one resistor and at least one capacitor at both ends. A resistor plate detector that reads the positive and negative signals according to claim 1 using differential amplifiers, respectively.

5. The widths and spacing of the multiple first positive signal strips and the multiple first negative signal strips are adjusted according to the target input impedance of the differential amplifier. A resistor plate detector that reads the positive and negative signals according to claim 1 using differential amplifiers, respectively.

6. A plurality of second positive electrode signal strips are formed in the shape of strips and arranged in parallel on the first surface of a second substrate, which is separated by a predetermined distance from the first surface of the first substrate, and facing the first surface of the first substrate. A plurality of second negative signal strips are formed on the second surface of the second substrate, opposite to the first surface, in the same shape as the second positive signal strip, and are arranged in parallel, facing each corresponding second positive signal strip in pairs; The system further includes a plurality of second ground strips, which are formed in the same shape and arranged in parallel between a plurality of second positive signal strips and a plurality of second negative signal strips. A resistor plate detector that reads the positive and negative signals according to claim 1 using differential amplifiers, respectively.

7. Multiple second positive signal strips, multiple second negative signal strips, and multiple second ground strips extend in a second direction perpendicular to the first direction. A resistor plate detector that reads the positive and negative signals according to claim 6 using differential amplifiers, respectively.

8. The output signals from the corresponding pair of second positive signal strips and second negative signal strips are input to a differential amplifier. The widths and spacing of the multiple second positive signal strips and the multiple second negative signal strips are adjusted according to the target input impedance of the differential amplifier. A resistor plate detector that reads the positive and negative signals according to claim 6 using differential amplifiers, respectively.

9. Each of the multiple first positive signal strips, multiple first negative signal strips, multiple second positive signal strips, multiple second negative signal strips, multiple first ground strips, and multiple second ground strips has at least one of the following shapes: rectangular, rectangular with both ends narrowing in a triangular shape, and rectangular with one end narrowing diagonally. A resistor plate detector that reads the positive and negative signals according to claim 6 using differential amplifiers, respectively.

10. Applicable to TOF (Time-of-flight) PET (Positron Emission Tomography), A resistor plate detector that reads the positive and negative signals according to claim 1 using differential amplifiers, respectively.

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