JPS6116537Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a radiation tomography apparatus.

A radiation tomography apparatus attempts to obtain a distribution image of a radiation source in a certain cross section of a patient.
In other words, RI (radioactive isotope) is taken into the patient's body as a drug, and when this RI accumulates in a specific organ, the radiation emitted from the RI is detected from outside the patient's body, and the RI in a specific cross section is detected.
The aim is to find out the distribution state of . Therefore, it is necessary to set a cross section that crosses the organ to be diagnosed, and perform radiation detection operations from 360° directions within this cross section. Since this cross section is normally set perpendicular to the patient's body axis, the radiation detector is rotated around the patient around the patient's body axis.

By the way, as the radiation detector, a two-dimensional radiation detector such as an Anger-type scintillation camera, which is normally used in a scintillation camera device, is used. That is, as shown in FIG. 1, the scintillation camera 2 is configured to rotate around the body axis O of the patient 1. Note that 3 is a parallel multi-hole collimator. However, subject (patient) 1
If the field of view of the camera 2 is larger than the field of view of the camera 2, there is a problem that the image cannot be reconstructed due to lack of data. Furthermore, since two-dimensional radiation detectors such as scintillation cameras are generally extremely heavy, it is extremely difficult to rotate them and stop them accurately at small angle intervals, which requires an extremely large-scale mechanism. do.

In view of the above, the present invention expands the field of view that can be photographed by swinging the two-dimensional radiation detector itself, facilitates the rotational movement of the entire two-dimensional radiation detector, and simplifies its rotation mechanism. The purpose of the present invention is to provide a radiation tomography device that can perform

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, a collimator 3 is arranged in front of an Anger-type scintillation camera 2, and this camera 2 is attached to the tip of a shaft 4. This shaft 4 is supported for oscillating motion by an oscillating motion drive unit 5 that has a built-in motor for oscillating motion, and this oscillation motion drive unit 5 is rotated by a rotation drive unit 7 that has a built-in motor. The rotary drive unit 7 is held by a stand 8. A patient 1, who is a subject, is lying on a bed 9, and the position of the bed 9 is set so that the body axis O coincides with the center of rotation of the rotary drive unit 7.

Next, the operation will be explained with reference to FIG.
First, the rotation drive unit 7 is stopped and the camera 2 is moved to the patient 1.
The camera 2 is stopped at a certain position on the circumference, and in this state the camera 2 is caused to swing within a certain angular range by the swing movement drive section 5. Then, along with the angle signal of the swing motion and the position signal of the center of the swing motion, the signals obtained from the camera 2 during the swing motion are AD converted, sent to a digital computer, and stored in a storage device or the like. Next, the rotation drive unit 7 moves the camera 2 to the patient 1.
The camera 2 is rotated around the circumference and stopped, and the camera 2 is again oscillated in the same manner as described above. In this way, when the camera 2 makes one rotation around the patient 1, all the data necessary to reconstruct the RI distribution image in the patient's 1 body can be obtained.

Note that even if the camera 2 is not rotated around the patient 1 and only the camera 2 is oscillated, the RI distribution image can be reconstructed, although it is incomplete.

As described in the embodiments above, according to the present invention, in addition to rotating the two-dimensional radiation detector around the subject, the detector is also rotated, so that Even in the case of large objects, it is possible to construct an RI distribution image without running out of data. Furthermore, since the sampling density of data is increased by the swing motion of the detector, the rotation of the detector can be performed intermittently at rough angles, and the rotation operation of the detector is facilitated.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram for explaining the conventional example, Figure 2 is a schematic diagram for explaining the conventional example;
The figure is a schematic perspective view of one embodiment of the present invention, and FIG. 3 is a schematic diagram for explaining the operation of FIG. 2. DESCRIPTION OF SYMBOLS 1...Patient, 2...Anger-type scintillation camera, 3...Collimator, 4...Axis, 5...Owing movement drive section, 6...Arm, 7...Rotation drive section, 8...Stand, 9... Betsudo.

Claims (1)

[Scope of utility model registration request] A radiation tomography system in which a two-dimensional radiation detector is rotated around the subject while facing toward the subject, and data obtained from the detector is processed by a computer to construct a distribution image of the radiation source in a desired cross section within the subject. The photographing device is configured to rotate the detector intermittently at predetermined angles and to cause the detector to oscillate, so that the oscillation occurs during the stop period of each intermittent rotational operation of the detector. A radiation tomography device characterized by being configured to perform exercise.