JP2007027455A - Analog/digital hybrid mounting circuit board and nuclear medical diagnosing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an analog/digital hybrid mounting circuit board which prevents the noise from mixing in through-holes of analog and digital signal wirings, and a nuclear medical diagnosing apparatus such as PET apparatus or SPECT apparatus having an observation unit containing a plurality of the circuit boards. <P>SOLUTION: The analog/digital hybrid mounting circuit board mounts analog signal circuits and digital signal circuits on the different surfaces of the board with a shielding power source layer disposed as an inner layer. Analog and digital signal wirings are connected from the shielding power source layer to the inner layers at the respective signal circuits, using blind through-holes. Signals for connecting between mutual circuits of the analog and digital signal systems make connection of only portions entering circuits at the connecting destination, using through-holes or open through-holes. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is a PET (Positron Emission Tomography) apparatus having an analog / digital mixed mounting circuit board that uses both an analog signal and a digital signal and an observation unit provided with the analog / digital mixed mounting circuit board. The present invention relates to a nuclear medicine diagnostic apparatus such as a SPECT (Single Photon Emission Computer Tomography) apparatus.

  A conventional printed circuit board using both an analog signal and a digital signal is known in Japanese Patent Application Laid-Open No. 11-145570 (Patent Document 1). In Patent Document 1, an analog ground directly corresponding to an analog circuit and a digital ground directly corresponding to a digital circuit are provided on a printed circuit board in which digital and analog circuits are mixed, and the analog circuit and the digital circuit are connected to each other. It is described that a signal line ground corresponding to the signal line is also provided, and the signal line ground extends the circuit-corresponding ground on the signal output side in both circuits.

  On the other hand, a PET (Positron Emission Tomography) apparatus that uses both an analog signal and a digital signal is known in Japanese Patent Laid-Open No. 2005-106805 (Patent Document 2). Patent Document 2 includes a support member and a plurality of detector units detachably attached to the support member, and a plurality of the detector units are detachably stored in the storage member. The unit substrate includes a first substrate and a second substrate, and the first substrate includes a plurality of semiconductors that detect radiation generated from a chemical solution injected into the body of the subject. A radiation detector, and the second substrate has an integrated circuit for processing a radiation detection signal output from each of the plurality of semiconductor radiation detectors, and the integrated circuit outputs a signal output from the semiconductor radiation detector. An analog integrated circuit for processing the analog integrated circuit, an AD converter for converting an analog signal output from the analog integrated circuit into a digital signal, and a digital integrated circuit for inputting the signal output from the AD converter, Each of the outputs from the circuit is input, and a counting device that counts the outputs corresponding to a pair of radiation detection signals detected during a set time is counted, and the counting information output from the counting device is used. A nuclear medicine diagnostic apparatus such as a PET apparatus for creating tomographic image information is described.

JP-A-11-145570 JP-A-2005-106805

  However, in the above-mentioned Patent Document 1, sufficient consideration has not been given to increasing the wiring density.

  Further, in the above-mentioned Patent Document 2, since noise mixing with respect to the minute analog signal detected from the radiation detector has not been sufficiently taken into consideration, the inaccuracy of diagnosis for the subject and the time burden required for the diagnosis are increased. It had the problem that.

  An object of the present invention is to enable high-density wiring of analog signal wiring and digital signal wiring in order to solve the above problems, prevent attenuation of a minute analog signal output from an analog signal system circuit, and also within the same substrate. An analog / digital mixed mounting circuit board in which noise from digital signals is reduced.

  Another object of the present invention is to prevent attenuation of a minute analog signal detected from a radiation detector, and to suppress the influence of noise in the substrate and noise from surroundings on the minute analog signal. An object of the present invention is to provide a nuclear medicine diagnostic apparatus such as a PET apparatus or a SPECT apparatus that includes an analog / digital mixed mounting circuit board that realizes wiring and reduces the accuracy of diagnosis for a subject and the burden of time required for diagnosis. .

  To achieve the above object, the present invention provides an analog signal system circuit mounted on one surface of a substrate, an analog / digital mixed circuit and a digital signal system circuit mounted on the other surface of the substrate, and an inner layer of the substrate. An analog / digital mixed mounting circuit board that handles both analog signals and digital signals provided with a shielding ground layer, wherein analog signal wiring is formed on the analog signal system circuit side of the shielding ground layer. A structure for performing wiring connection between the analog signal wiring and the analog signal system circuit using a non-through hole, and forming a digital signal wiring on the digital signal system circuit side of the shielding ground layer, A structure for performing wiring connection between the signal wiring and the digital signal system circuit and the analog-digital mixed circuit using a non-through hole, And having a structure for wiring connection between the analog signal wiring and the analog-digital mixed circuit with a through hole or through hole.

  Further, the present invention is characterized in that the analog / digital mixed mounting circuit board further has a structure in which a shielding ground layer is provided on one surface side of the board so as to sandwich the analog signal wiring.

  In the analog-digital mixed mounting circuit board, the present invention further includes another analog signal system circuit that outputs an analog signal having an amplitude different from that of the analog signal system circuit on one surface side of the board, It is characterized in that a shielding ground layer is provided between the analog signal wirings having different amplitudes.

Further, the present invention is a nuclear medicine diagnostic apparatus comprising an observation unit that observes radiation emitted from a subject and performs diagnosis by tomography,
The observation unit section
A radiation detector group configured by arranging a plurality of radiation detectors for detecting the radiation is mounted on one surface of the substrate, and at least amplifies a radiation detection signal output from each of the radiation detector groups. Analog integrated circuit having an analog integrated circuit and an ADC circuit that converts the amplified radiation signal into a digital radiation signal, radiation information obtained from the analog digital mixed circuit, and detection time when the radiation is detected An analog signal and a digital signal having a digital signal system circuit for generating integrated information including information and detector ID information for detecting the radiation mounted on the other surface of the substrate and having a shielding ground layer on the inner layer of the substrate Have both analog and digital mixed mounting circuit boards that handle both
The analog / digital mixed mounting circuit board forms an analog signal wiring for transmitting a radiation detection signal to the radiation detector group side of the shielding ground layer, and the formed analog signal wiring and each radiation detector And a digital signal wiring is formed on the digital signal system circuit side of the shielding ground layer, and the digital signal wiring, the digital signal system circuit, and the analog digital A structure in which wiring connection between the embedded circuit is performed using a non-through hole and a structure in which wiring connection between the analog signal wiring and the analog / digital mixed circuit is performed using a through hole or a through hole. It is characterized by having.

Further, the present invention is a nuclear medicine diagnostic apparatus comprising an observation unit that observes radiation emitted from a subject and performs diagnosis by tomography,
The observation unit section
A radiation detector group configured by arranging a plurality of semiconductor radiation detectors for detecting the radiation is mounted on one surface of a substrate, and at least amplifying a radiation detection signal output from each of the radiation detector groups An analog integrated circuit for obtaining a peak value of radiation, an analog / digital mixed circuit having an ADC circuit for converting the obtained peak value of radiation into a digital radiation peak value, and a radiation obtained from the analog / digital mixed circuit A digital signal system circuit that generates integrated information including peak value information, detection time information when the radiation is detected, and detector ID information that detects the radiation is mounted on the other surface of the substrate, and the inner layer of the substrate Has a mixed analog / digital mounting circuit board that handles both analog and digital signals with a shielding ground layer,
The analog / digital mixed mounting circuit board forms an analog signal wiring for transmitting a radiation detection signal to the radiation detector group side of the shielding ground layer, and the formed analog signal wiring and each radiation detector And a digital signal wiring is formed on the digital signal system circuit side of the shielding ground layer, and the digital signal wiring, the digital signal system circuit, and the analog digital A structure in which wiring connection between the embedded circuit is performed using a non-through hole and a structure in which wiring connection between the analog signal wiring and the analog / digital mixed circuit is performed using a through hole or a through hole. It is characterized by having.

  According to the present invention, analog signal wiring and digital signal wiring are performed by non-through-holes that do not cross the shielding power supply layer, so that noise contamination due to interference between through-holes can be eliminated and shielding is achieved. Analog signal through hole and digital signal through hole can be placed on the same plane coordinate with the power supply layer in between, enabling the implementation of mixed analog / digital mounting circuit boards with improved wiring efficiency and increased board mounting density It becomes possible to do.

  In addition, according to the present invention, by using the structure of the analog / digital mixed mounting circuit board to suppress the influence of noise on the minute analog signal from the radiation detector, it is possible to perform highly accurate measurement and reduce the time required for diagnosis. A shortened PET device or SPECT device can be configured, and a diagnostic device with less burden on the patient can be provided.

  A nuclear medicine diagnostic apparatus such as a PET (Positron Emission Tomography) apparatus or a SPECT (Single Photon Emission Computer Tomography) apparatus provided with the analog / digital mixed mounting circuit board according to the present invention. Embodiments will be described with reference to the drawings.

[First Embodiment]
A circuit board according to a first embodiment of the present invention will be described with reference to FIGS. The symbols in each figure indicate the same items.

  The structure of a typical first example of the circuit board according to the first embodiment of the present invention is shown in FIG. Reference numeral 100a denotes the analog / digital mixed mounting circuit board of the first embodiment. Reference numeral 101 denotes a number of analog signal circuits that output analog signals each having a minute amplitude. Reference numeral 102 denotes a process of amplifying the minute amplitude analog signals output from each of the analog signal circuits 101, for example. Analog ASIC having a plurality of analog signal processing circuits made into an analog ASIC and a plurality of ADC circuits for converting each of a plurality of analog signals (peak values) subjected to processing such as amplification by the analog ASIC into digital signals Reference numeral 103 denotes a mixed circuit. Reference numeral 103 denotes a digital signal system circuit including a plurality of packet data generation devices including a plurality of time information generation circuits and an ADC control circuit, and a digital ASIC in which the data transfer circuit is formed as an LSI. In the present invention, the analog / digital mixed circuit 102 is also included in a part of the digital signal system circuit 103.

  The analog signal system circuit 101 is disposed on one side (front surface) of the analog / digital mixed mounting circuit board, and the analog / digital mixed circuit 102 and the digital signal system circuit 103 are disposed on the other side (back surface) of the circuit board. . A shielding power supply layer (ground layer) 104 is disposed on the inner layer of the circuit board. The analog signal wiring 106 used between the analog signal system circuit 101 and the analog / digital mixed circuit 102 is an inner layer (analog signal system wiring layer) on the surface where the analog signal system circuit 101 is arranged from the shielding power supply layer 104. The digital signal wiring 107 used for connection between the digital signal system circuit 103 and the analog / digital mixed circuit 102 is an inner layer on the surface where the digital signal system circuit 103 is arranged from the shielding power supply layer 104. Connect using (digital signal system wiring layer). As a result, noise contamination from the digital signal wiring 107 to the analog signal wiring 106 is separated (shielded) by the shielding power supply layer (ground layer) 104.

  The power supply layer (ground layer) 105 for the digital signal system circuit is placed on the inner layer (digital signal system wiring layer) on the arrangement surface of the digital signal system circuit 103 from the shielding power supply layer 104 to be supplied with power.

  The analog signal wiring 106 connected from the analog signal system circuit 101 to the analog / digital mixed circuit 102 passes most of the wiring from the shielding power supply layer (ground layer) 104 to the inner layer on the analog signal system circuit arrangement side, and the digital signal system circuit Only the lead-in portion 106b (corresponding to 110b in the case of the third embodiment shown in FIG. 3) connected to the analog / digital mixed circuit 102 is a through-hole or a through-through hole, and the inner layer (digital signal system) Pass through the wiring layer). The noise that the minute analog signal passing through the analog signal system wiring 106 receives from the digital signal is limited to the short length of only the digital layer portion of the through hole 106b and the through hole 107b, so that the analog signal wiring 106 receives noise. Can be reduced.

  In addition, each of the analog signal wiring 106a and the digital signal wirings 107a and 107b is connected by using a non-through hole, so that the analog / digital heterogeneous signal through holes can be arranged at the same coordinates on the substrate plane. Thus, it is possible to contribute to an increase in board mounting density, and it is possible to prevent the through holes 107a and 107b of the digital signal wiring from entering and interfering with the analog signal wiring layer 106.

  As described above, the analog / digital mixed mounting circuit board according to the first embodiment of the present invention includes the analog signal system circuit 101, the analog / digital mixed circuit 102, and the digital signal system circuit 103 as shown in FIG. A circuit board that is mounted on different surfaces and has a configuration in which both circuits are separated by a shielding power supply layer 104 in the board, and has a multilayer board structure, and shields the analog signal wiring 106 and the digital signal wiring 107. The analog signal system circuit 101 and the analog / digital mixed circuit are configured so that interference between the through hole 106a and the through hole 107a can be eliminated by passing the through hole for wiring through different sides of the power supply layer 104 for wiring. Through-holes 106b connected to different signal system circuits such as those connected to each other (in the case of the third embodiment shown in FIG. 110b is correspondingly) only a through-hole or through hole.

  In addition, after implementing the substrate structure shown in the first embodiment, the analog wiring 106 and the digital wiring 107 in FIG. By adjusting the thickness of the interlayer insulating film), the wiring pattern width, etc., the wiring impedance can be set to an arbitrary wiring impedance that meets both needs. That is, when a minute signal is handled as an analog signal, it is possible to apply a wiring impedance significantly different from that of the digital signal wiring 107 to the analog signal wiring 106 in order to prevent attenuation of the signal.

  Next, a second embodiment different from the representative first embodiment shown in FIG. 1 will be described with reference to FIG. Reference numeral 100b denotes the analog / digital mixed mounting circuit board of the second embodiment. FIG. 2 shows the substrate structure shown in the first embodiment, and the analog signal wiring 106 is a signal line with a minute amplitude, which is shielded not only for the digital signal system circuit but also for blocking the influence of external electromagnetic waves. A structure is shown in which a power supply layer (ground layer) 108 is added to improve resistance to noise mixing in an analog signal wiring. That is, by sandwiching both sides of the analog signal wiring 106 through which a minute signal passes between the shielding power supply layers (ground layers) 104 and 108, it is possible to block not only the digital signal system circuit but also the influence of external electromagnetic waves. Become.

  Next, a third embodiment different from the representative first embodiment shown in FIG. 1 will be described with reference to FIG. Reference numeral 100c denotes an analog / digital mixed mounting circuit board according to the third embodiment. FIG. 3 shows an analog signal system circuit such as an amplification processing circuit, which is different from the analog signal wiring 106 having a small amplitude, in addition to the analog signal wiring 106 having a small amplitude, after implementing the substrate structure shown in the first embodiment. 102b is shown, and the wirings 106 and 110 having different amplitudes are separated by a power supply layer (ground layer) 111 for blocking, so that noise can be prevented from entering the analog signal wiring 106 having a minute amplitude. It becomes. That is, when signals 110 having different signal amplitudes are used as analog signals, the analog signal wiring 106 with a minute amplitude is separated from the wiring layer, each signal is separated by a non-through hole, and a shielding power supply layer (ground layer) In 108, it is possible to prevent noise from being mixed. In the third embodiment, in the first and second embodiments, the analog / digital mixed circuit 102 performs analog processing such as amplification processing and the like (analog signal system circuit) 102b and the analog signal is converted into a digital signal. Separately from the ADC circuit portion 102a to be converted, the ADC circuit portion 102a is mounted on the other surface (back surface) of the substrate, and a circuit portion (analog signal system circuit) 102b for performing analog processing such as amplification processing is provided on one side of the substrate. It is mounted on the surface (surface).

  Further, in FIGS. 1 to 3, even when the number of wiring requests for analog signals / digital signals increases, the number of wirings can be increased without increasing the influence on noise mixing by increasing the layers of each region. It becomes possible.

[Second Embodiment]
Next, a second embodiment of a nuclear medicine diagnosis apparatus such as a PET apparatus or a SPECT apparatus provided with the analog / digital mixed mounting circuit board according to the present invention will be described with reference to FIG.

  A nuclear medicine diagnosis apparatus such as a PET apparatus or a SPECT apparatus according to the present invention uses the circuit board 100a described in the first embodiment as a bonding board described in JP-A-2005-106805 (Patent Document 3). That is, it is composed of 100b or 100c.

  FIG. 4 shows a basic configuration of an observation unit (detector unit) 30 constituting a camera in the PET apparatus and the SPECT apparatus. As a nuclear medicine diagnostic apparatus, a PET apparatus includes a camera (imaging apparatus), a data processing apparatus, a display apparatus, and the like. A subject 320 is placed on a bed and photographed with a camera. The camera incorporates a large number of semiconductor radiation detectors 101, and the semiconductor radiation detector 301 (101) detects radiation (γ rays) emitted from the body of the subject 320. The camera has an integrated circuit (ASIC: Application Specific IC) for measuring the crest value and detection time of the radiation, and is configured to measure the crest value and detection time of the detected radiation (γ-ray). Is done. A data processing device (not shown) captures packet information including the detected crest value, detection time data, and the detector (channel) ID. The simultaneous measuring device in the data processing device performs simultaneous measurement based on the packet information, particularly the detection time data and the detector ID, and the simultaneously measured count value (counting information) and the detector at the time of radiation detection. The tomogram information of the subject is created using the position information of the subject, and information such as the packet information, the count value obtained by the simultaneous measurement, the position information of the detector, and the tomogram information is stored in the storage device. Furthermore, a tomographic image information creation device (not shown) in the data processing device creates a functional image (tomographic image) based on the detection position of the detector and displays it on a display device (not shown). To do.

  Inside the camera, in order to detect radiation emitted from the subject 320, a circuit board in which a large number of semiconductor radiation detectors 301 (101) are arranged in a grid (for example, 16 in a row and 64 in a total of 64 rows). A large number of observation unit units (detector units) 30 that accommodate a plurality of 300 (100) are arranged in a circumferential shape. The subject 320 lies on the bed and is positioned at the center of the camera. At this time, each semiconductor radiation detector surrounds the bed. From the observation unit 30, the radiation peak value information and the radiation detection time information obtained based on the detection signal when the semiconductor radiation detector 301 (101) interacts with radiation, and the radiation detector 301. Address information (detector ID) is output for each radiation detector 301 included in the observation unit 30.

  Next, a number of circuit boards 300 (100) installed in the observation unit 30 will be described. Each circuit board 300 arranges radiation detectors 301 as a plurality of analog signal system circuits on one side (surface), and performs processing such as amplifying a small amplitude analog signal output from each of the radiation detectors. An analog ASIC 3021 in which a large number of analog signal processing circuits to be performed are made into LSI, and a plurality of ADC circuits 3022 that convert each of a plurality of analog signals (peak values) subjected to processing such as amplification by the analog ASIC 3021 into digital signals are provided. A digital ASIC in which an analog / digital mixed circuit 302 (102) is arranged on the other side (back side), and a plurality of packet data generation devices 3031 and a data transfer circuit 3032 including a plurality of time information generation circuits and ADC control circuits are formed as LSIs. The digital signal system circuit 303 (103) provided with the other side (back side) The plurality of radiation detectors 301 and the analog / digital mixed circuit 302 are connected by a plurality of analog signal wirings 306 (106, 106a, 106b), and the analog / digital mixed circuit 302 and the digital signal system circuit are connected. 303 is connected with a digital signal wiring 307 (107, 107a, 107b), and as shown in the first embodiment of FIG. 1, a shielding power supply layer (ground layer) 104 and a digital signal system circuit power supply layer ( A ground layer) 105 is provided inside. In the case of the second embodiment shown in FIG. 2, a shielding power supply layer (ground layer) 108 is further provided.

  The analog ASIC 3021 includes a plurality of radiation detectors 301 (101) and analog signal wirings 306 (106), and an analog signal processing circuit having a slow system and a fast system is provided corresponding to the radiation detector 301. Is done. The slow system amplifies a signal with a small amplitude detected by the radiation detector 301, performs processing such as shaping, obtains the peak value of the radiation, holds it in a peak hold circuit, and stores the peak value of the held radiation. The wiring is supplied to the ADC circuit 3022 and converted into a digital peak value, and is transmitted to the plurality of packet data generation devices 3031 of the digital ASIC of the digital signal system circuit 303 (103) through the digital signal wiring 307 (107). The first system outputs a timing signal for specifying the radiation detection time, and is supplied to the digital ASIC (data processing digital circuit) of the digital signal system circuit 303 (103) through the digital signal wiring 307.

  All the digital ASICs provided in the PET apparatus operate in synchronization with receiving a clock signal from the clock generator. The clock signal input to each digital ASIC is input to each time information generation circuit in all packet data generation devices 3031. The time information generation circuit determines the radiation detection time (time information) based on the clock signal when the timing signal is input from the first system of the analog ASIC 3021. The ADC control circuit specifies the detector ID corresponding to the time determination, converts the peak value of the radiation corresponding to the specified radiation detector ID into the digital peak value in the ADC circuit 3022, and converts the digital peak value into the digital signal wiring 307. (107) to the packet data generation device 3031 of the digital ASIC 303 (103). In this manner, each packet data generation device 3031 obtains packet data (integrated information) including radiation detector ID information (detector position information), the time information, and peak value information, and is input to the data transfer circuit 3032. The In this way, the unit provided in the detector unit 30 that accommodates a large number of analog / digital mixed mounting circuit boards 300 (100) periodically, for example, is packet data that is digital information obtained from the data transfer circuit 3032. It is transmitted to an integrated circuit (unit integrated FPGA (Field Programmable Gate Array)) 310 for integration. The unit integrated FPGA (data summing digital circuit) 310 transmits the digital information to the data processing device (not shown) via the information transmission wiring connected to the connector.

  As described above, according to the second embodiment, in the nuclear medicine diagnostic apparatus such as a PET apparatus or a SPECT apparatus, each of the multiple analog / digital mixed mounting circuit boards installed in the observation unit section is the first. By configuring as in the embodiment, it is possible to perform diagnosis by tomography based on high-accuracy radiation detection by suppressing noise mixing in an analog signal having a minute amplitude detected by a semiconductor radiation detector, In addition, the time required for the diagnosis can be shortened.

  According to the present invention, an analog signal having a minute amplitude can be handled in a state in which mixing of different signals within the same substrate or noise from an external radiated electromagnetic field is suppressed, and an analog signal system circuit and a digital signal system circuit Can be mounted at high density.

  Further, by providing a PET apparatus and a SPECT apparatus using the analog / digital mixed mounting circuit board according to the present invention, it is possible to provide a diagnostic apparatus with less burden on the patient.

It is sectional drawing which shows the 1st Example of the analog digital mixed mounting circuit board which is 1st Embodiment based on this invention. It is sectional drawing which shows the 2nd Example of the analog digital mixed mounting circuit board which is 1st Embodiment based on this invention. It is sectional drawing which shows the 3rd Example of the analog digital mixed mounting circuit board which is 1st Embodiment based on this invention. The basic structure of the observation unit part which comprises the camera which is 2nd Embodiment of nuclear medicine diagnostic apparatuses, such as PET apparatus or SPECT apparatus provided with the analog digital mixed mounting circuit board based on this invention concerning this invention. It is the shown perspective view.

Explanation of symbols

100, 100a to 100c, 300 ... analog / digital mixed mounting circuit board, 101, 102b ... analog signal system circuit, 102, 102a ... analog / digital mixed circuit, 103 ... digital signal system circuit (digital ASIC), 104, 108 ... for shielding Power supply layer (ground layer), 106, 110, 306 ... analog signal wiring, 106a, 107a, 107b ... non-through hole, 106b ... through hole or through hole, 107,307 ... digital signal wiring,
DESCRIPTION OF SYMBOLS 30 ... Observation unit part 301 ... Radiation detector (analog signal system circuit) 302 ... Analog digital mixed circuit (Analog ASIC and ADC circuit, such as an amplifier circuit), 3021 ... Analog ASIC, such as an amplifier circuit, 3022 ... ADC circuit , 303... Digital signal system circuit (data processing digital circuit: digital ASIC), 3031... Packet data generation device, 3032... Data transfer device, 310 .. unit integration integrated circuit (data aggregation digital circuit: unit integration FPGA) 320 ... Subject (patient).

Claims (3)

An analog signal system circuit is mounted on one side of the board, an analog / digital mixed circuit and a digital signal system circuit are mounted on the other side of the board, and an analog signal and digital signal having a shielding ground layer on the inner layer of the board An analog-digital mixed mounting circuit board that handles both signals,
A structure in which an analog signal wiring is formed on the analog signal system circuit side of the shielding ground layer, and a wiring connection between the formed analog signal wiring and the analog signal system circuit is performed using a non-through hole. ,
A digital signal wiring is formed on the digital signal system circuit side of the shielding ground layer, and a wiring connection between the digital signal wiring and the digital signal system circuit and the analog / digital mixed circuit is made using a non-through hole. Structure to do,
An analog / digital mixed mounting circuit board having a structure in which wiring connection between the analog signal wiring and the analog / digital mixed circuit is performed using a through hole or a through hole. A nuclear medicine diagnostic apparatus comprising an observation unit for observing radiation emitted from a subject and making a diagnosis by tomography,
The observation unit section
A radiation detector group configured by arranging a plurality of radiation detectors for detecting the radiation is mounted on one surface of the substrate, and at least amplifies a radiation detection signal output from each of the radiation detector groups. Analog integrated circuit having an analog integrated circuit and an ADC circuit that converts the amplified radiation signal into a digital radiation signal, radiation information obtained from the analog digital mixed circuit, and detection time when the radiation is detected An analog signal and a digital signal having a digital signal system circuit for generating integrated information including information and detector ID information for detecting the radiation mounted on the other surface of the substrate and having a shielding ground layer on the inner layer of the substrate Have both analog and digital mixed mounting circuit boards that handle both
The analog / digital mixed mounting circuit board forms an analog signal wiring for transmitting a radiation detection signal to the radiation detector group side of the shielding ground layer, and the formed analog signal wiring and each radiation detector And a digital signal wiring is formed on the digital signal system circuit side of the shielding ground layer, and the digital signal wiring, the digital signal system circuit, and the analog digital A structure in which wiring connection between the embedded circuit is performed using a non-through hole and a structure in which wiring connection between the analog signal wiring and the analog / digital mixed circuit is performed using a through hole or a through hole. A nuclear medicine diagnostic apparatus comprising: A nuclear medicine diagnostic apparatus comprising an observation unit for observing radiation emitted from a subject and making a diagnosis by tomography,
The observation unit section
A radiation detector group configured by arranging a plurality of semiconductor radiation detectors for detecting the radiation is mounted on one surface of a substrate, and at least amplifying a radiation detection signal output from each of the radiation detector groups An analog integrated circuit for obtaining a peak value of radiation, an analog / digital mixed circuit having an ADC circuit for converting the obtained peak value of radiation into a digital radiation peak value, and a radiation obtained from the analog / digital mixed circuit A digital signal system circuit that generates integrated information including peak value information, detection time information when the radiation is detected, and detector ID information that detects the radiation is mounted on the other surface of the substrate, and the inner layer of the substrate Has a mixed analog / digital mounting circuit board that handles both analog and digital signals with a shielding ground layer,
The analog / digital mixed mounting circuit board forms an analog signal wiring for transmitting a radiation detection signal to the radiation detector group side of the shielding ground layer, and the formed analog signal wiring and each radiation detector And a digital signal wiring is formed on the digital signal system circuit side of the shielding ground layer, and the digital signal wiring, the digital signal system circuit, and the analog digital A structure in which wiring connection between the embedded circuit is performed using a non-through hole and a structure in which wiring connection between the analog signal wiring and the analog / digital mixed circuit is performed using a through hole or a through hole. A nuclear medicine diagnostic apparatus comprising:

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