JPS63266385A - Data collecting device for x-ray ct - Google Patents

Abstract

PURPOSE:To prevent a noise from being mixed, by forming a base wiring board by a pattern interval layer type, and placing a signal processing wiring board in the direction vertical to the X-ray incident direction. CONSTITUTION:In a circular arc-like Xe gas detector 10 in which the one end of a hermetic pin connected the other end thereof to an inner channel electrode is led out in the direction vertical to the X-ray incident direction, a base wiring board 11 shielded with a ground plane is placed by plural pattern internal layer types at a suitable interval along its peripheral direction. To plural signal processing wiring board connectors 13 of the base wiring board 11, plural signal processing wiring boards 14 to which an integrated circuit element, a capacitor and a resistance, etc., are mounted are expanded in the vertical direction against the base wiring board 11 and fitted. In such a way, an X-ray shielding substance 15 can be placed on the X-ray incident direction side of the signal processing wiring board, therefore, mixture of a noise due to irradiation of X rays can be prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention includes a Xe gas detector, performs signal processing on the signal from the Xe gas detector, and outputs it as collected data. A small data collection device for XICT. - (Prior art) Xe gas detectors such as ionization chamber type detectors and semiconductor detectors are generally used as detectors for XICT data collection equipment, but ionization chamber type Xe gas detectors are multi-channel. Since the semiconductor detector can be configured as a single type, it can take out multi-channel signals, and since the semiconductor detector can take out one-channel signals, it can be configured as an X-ray CT data acquisition device, especially for signals. The structure of the processing stage is different, and noise countermeasures are a common problem. That is, regardless of whether it is an Xe gas detector or a semiconductor detector, the configuration as an X-ray CT data acquisition device must include multi-channel detection elements and signal processing elements derived from each of these detection elements. , Flexible flat cable (FFC) is a multi-core electric wire because it has multiple channels.
) or a flexible printed circuit (FPC), a large number of detection elements and a large number of signal processing elements are electrically connected and roughly led out to the outside.

FIG. 3 shows a conventional data station data collection device for XIICT (US Pat. No. 4,571,495). Third
In the figure, a plurality of semiconductor detectors 2 are provided at appropriate intervals on one surface (the surface on the X-ray incident side) of a base wiring board 1 by dipping terminals. A signal processing board 3 is provided on the other surface of the base distribution board 1 so as to be electrically connected to the terminals via a board connector 4 and to face in the same direction as the X-ray incident direction. A flat cable connector 5 is provided at the longitudinal end of the base wiring board 1, and an FFC 6 for deriving collected data is connected to this connector 5. This FFC6 is Xl1CT (not shown)
computer system.

According to the above configuration, the base wiring board 1 is
It is fixedly incorporated into the gantry of the lmCT and is opposed to an X-ray source (not shown), thereby arranging multi-channel detection elements on an arc, and transmitting signals from these multi-channel detection elements to each signal processing board. FF after signal processing in 3
Collected data can be obtained by C6. in this case,
The FFC6 is subjected to vibration due to the rotation of the gantry, etc., and generates frictional charges, so as a noise countermeasure, the FFC6 uses a shielded multicore coaxial cable to prevent the above charges from entering the signal line as noise. .

However, in the configuration shown in the third factor, the signal processing board 3
Since the base wiring board 1 and the signal processing board 3 are provided so as to face in the same direction as the X-ray incident direction, and no X-ray shield is provided between the base wiring board 1 and the signal processing board 3, the X-rays, which are ionizing radiation, are The light passes through the substrate 1 and irradiates the signal processing substrate 3. Therefore, it has an electrical effect on electronic components such as integrated circuit elements and capacitors mounted on the signal processing board 3,
When a high-power X-ray source is used, problems comparable to the cable noise described above may arise.

(Problems to be Solved by the Invention) As described above, although cable noise is suppressed in the conventional technology,
Since the influence of lines was not taken into consideration, the collected data contained noise and had low accuracy, which was a problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an X-ray system that can prevent noise from being mixed in and that is not affected by X-rays in the signal processing stage.
An object of the present invention is to provide a data acquisition device for line CT.

[Structure of the Invention] (Means for Solving the Problems) The present invention has a structure in which the following measures are taken to solve the above problems and achieve the object. That is, the present invention converts incident X-rays into electrical signals, performs signal processing on the signals, and outputs them as collected data.
An Xe gas detector formed by connecting one end of a hermetic pin to an internal channel electrode and leading out the other end of the hermetic pin in a direction perpendicular to the direction of X-ray incidence;
A patterned inner layer type base wiring board which is electrically connected to the other end of the hermetic pin at a right angle, and each channel of the Xe gas detector which is installed at a right angle to the base wiring board and is introduced through the hermetic pin. The present invention is characterized by comprising a signal processing wiring board that performs signal processing on the signal and outputs it as collected data.

(Function) According to this configuration, the signal from the Xe gas detector is guided to the base wiring board via the hermetic pin, and then introduced to the signal processing wiring board provided perpendicularly to the base wiring board. Predetermined signal processing is performed and collected data is output, but since the base wiring board 11 is a patterned inner layer type, it has noise resistance, and the signal processing wiring board is installed in a direction perpendicular to the direction of X-ray incidence. Since X1s is extended to the side, the signal processing wiring board is not irradiated with Since the processing wiring board is not irradiated, it is possible to prevent noise from entering, and the signal processing stage has XI! can be made unaffected by

(Embodiment) An embodiment of the X-ray CT data acquisition device according to the present invention will be described below with reference to FIG. 1 and FIG. 2, which is a cross-sectional view taken along the AA direction of FIG. 1.

In FIGS. 1 and 2, the arc-shaped Xe gas detector 10 has one end connected to an internal channel electrode and the other end of the hermetic pin 10a led out in a direction perpendicular to the X-ray incident direction. A plurality of patterned inner layer type base wiring boards 11 shielded by ground brains are arranged at appropriate intervals along the circumferential direction. This base wiring board 11 has a multilayer structure with a conductive pattern layered inside, and as shown in FIG. , the base wiring board 11 is fixed by screws 12 to a surface of the arc-shaped Xe gas detector 10 in a direction perpendicular to the X-ray incident direction.

Further, a plurality of signal processing wiring board connectors 13 are arranged in multiple stages on the base wiring board 11, and the terminals of the connectors 13 are electrically connected to the conductive patterns of the base wiring board 11. The connector 13 includes an integrated circuit element,
A plurality of signal processing wiring boards 14 on which capacitors, resistors, etc. are mounted are extended and fitted in a direction perpendicular to the base wiring board 11.

According to the above configuration, the following effects are achieved.

According to the configuration of this embodiment, the signal from the Xe gas detector 10 is transmitted to the base wiring board 1 through the hermetic pin 10a.
1, and connect connector 1 to the base wiring board 11.
3 to the signal processing wiring board 14 provided at right angles, and undergoes predetermined signal processing and outputs collected data.

Furthermore, since the base ta substrate 11 is of a patterned inner layer type, it has noise resistance.

Further, since the signal processing wiring board 14 is provided extending in a direction perpendicular to the direction of X-ray incidence, the signal processing wiring board 14 is not irradiated with X-rays, preventing noise from entering, and allowing the signal processing The stage can be protected from the influence of X-rays.

Further, since the signal processing wiring board 14 is provided at right angles to the base wiring board 11 and extending in a direction perpendicular to the X-ray incident direction, the signal processing wiring board 14 is provided on the X-ray incident direction side as shown in FIG. As shown, the X-ray shield 15 can be arranged, and as a result, the signal processing wiring board 14 is not irradiated with X-rays, thereby preventing the incorporation of noise and preventing the influence of X-rays in the signal processing stage. You can avoid receiving

Generally speaking, since the signal processing board 14 can be inserted into and removed from the connector 13, if the signal processing board 14 is configured for each channel, it is possible to easily check the operation of the signal processing system of the channel.

Note that the present invention is not limited to the above-mentioned embodiments,
A semiconductor detector is provided on one surface of the base arrangement substrate 11,
The signal processing wiring board may be provided extending in a direction perpendicular to the X-ray incident direction on the other surface. The invention can be modified in various ways without departing from the gist of the invention.

[Effects of the Invention] As described above, the present invention provides an Xe gas detector in which one end of the hermetic pin is connected to an internal channel electrode and the other end of the hermetic pin is led out in a direction perpendicular to the X-ray incident direction, and the hermetic A patterned inner layer type base wiring board that is electrically connected to the other end of the pin at a right angle, and a signal for each channel of the Xe gas detector that is installed at right angles to this base wiring board and introduced through the hermetic pin. Since the X13 gas detector is equipped with a signal processing wiring board that performs signal processing and outputs it as collected data, the signal from the The base wiring board is a patterned inner layer type, so it is noise resistant, and the signal processing wiring board is Since it is provided extending in a direction perpendicular to the direction of X-ray incidence, the signal processing wiring board is not irradiated with X-rays, and an X-ray shield is placed on the side of the signal processing wiring board in the direction of X-ray incidence. Since the signal processing wiring board is not irradiated with X-rays, it is possible to prevent noise from being mixed in, and the signal processing stage is not affected by the X-rays. be.

[Brief explanation of drawings]

FIG. 1 shows a partial front entrance of an embodiment of an X-ray CT data acquisition device according to the present invention, and FIG.
A cross-sectional view along direction A, the third factor is a diagram showing a conventional example. 10...Xe gas detector, 11...Base wiring board. 14...Signal processing wiring board. Applicant's agent Patent attorney Takegu Suzue Figure 1 Figure 2

Claims (1)

[Claims] In an X-ray CT data acquisition device that converts incident X-rays into electrical signals, performs signal processing on the signals, and outputs them as collected data, the other end of a hermetic pin connected to an internal channel electrode is connected to an X-ray an Xe gas detector led out in a direction perpendicular to the incident direction; a patterned inner layer type base wiring board electrically connected to the other end of the hermetic pin at right angles; and a Xe gas detector provided perpendicularly to the base wiring board. and a signal processing wiring board that performs signal processing on the signals of each channel of the Xe gas detector introduced via the hermetic pin and outputs the processed data as collected data. Device.