JPS6384209U - - Google Patents

Description

[Brief explanation of the drawing]

1 is a schematic perspective view of a scanning device according to the invention, FIG. 2 is a schematic perspective view of the rotatable assembly of FIG. 1, and FIG. 3 is a partially cutaway section of the device of FIGS. 1 and 2. FIG. Figure 4 is a schematic electrical block diagram of the control and circuit components utilized in the apparatus of Figures 1, 2 and 3; It shows the relationship with the rest of the processing tomography device. FIG. 5 is a schematic electrical block diagram of a preferred form of an amplification/multiplexing circuit that can be used in the present invention and calibrates a detection signal channel in conjunction with patient diagnosis; FIG. Front view of the slip ring assembly section taken along the
FIG. 7 is a partially cutaway, partially sectional elevational view taken along line 7--7 of FIG. 10...Scanning device, 12...Cover, 16...
rotatable assembly, 20... control and image reproduction station, 36... central aperture, 40... positioning table, 50... X-ray source, 52... fan beam, 54
... patient, 56 ... detector array, 64 ... signal processing conditioning means, 70 ... slip ring assembly, 76, 82 ... cover portion, 92 ... tomography device, 94 ... machine/patient area , 98...
Amplification multiplexing block, 100...Detector control logic circuit, 102...Analog-to-digital converter, 1
04... Slip ring assembly, 106... Input/output/direct memory access control means,
108...Central control panel/logic circuit, 110...
...Slip ring assembly.

Claims (1)

[Scope of utility model registration request] for producing a digital output signal for use in diagnosing a body part of a patient by means of penetrating radiation and reproducing a two-dimensional display of body tissue in a thin section taken through said body part; an assembly rotatable about an axis extending along a central opening formed therein, the body part to be diagnosed such that the axis of rotation of the assembly is substantially perpendicular to the thin section; means for positioning within said central opening, a radiation source mounted on said assembly towards one side of said assembly and producing penetrating radiation in the form of a fan beam, for propagating across said thin section and transmitting said radiation to said assembly; detection means for said radiation disposed on said assembly opposite said radiation source for detecting radiation not absorbed by said body part; said fan beam being directed at said body part from a plurality of angles of incidence; means for rotating said assembly so as to impinge; a signal processor mounted on and movable with said assembly for receiving and amplifying the output signal of said detection means and converting it into a digital signal; conditioning means and first connection means for receiving the output of said signal processing conditioning means and transmitting said digitized output signal to an image reproduction station, said detection means configured to detect a plurality of output signals; the signal processing conditioning means having a plurality of channels for increasing the gain of the output signal;
The channel is such that differences in the intensity levels received by the connected detection elements as a result of differences in the expected density path lengths of the radiation traveling to each detection element increase the gain of the channel according to the expected density path lengths. compensated for by including means for differentiating the gain applied to the output signal of the detection element receiving the end portions of the fan beam from the detection element receiving the central portion of the fan beam; A device characterized in that the device is configured to decrease toward the detection element.