Nuclear medical diagnosing apparatus and data collecting method for nuclear medical diagnosis

Abstract

The nuclear medicine diagnostic apparatus of the present invention detects radiation emitted by an atomic nuclide injected into a subject as projection data with a gamma camera, and obtains an image showing the distribution of atomic nuclides in the subject based on the projection data. The device includes: a rotation unit that rotates the radiation detector around the subject; a breath recognition unit that recognizes breathing stoppage and respiration caused by the stop of breathing of the subject; a data storage unit for storing radiation detection data collected by the radiation detector; and an image generation unit for generating an image based on the radiation detection data stored in the data storage unit based on the identification result of the breathing identification unit.

Description

technical field [0001] The present invention relates to a nuclear medicine diagnostic device that uses a gamma (γ) camera to detect radiation emitted from an atomic nuclide (radioisotope: RI) administered to a subject, and images the distribution of RI from the detected information, and a nuclear medicine diagnostic device. Data Collection Methods. Background technique [0002] With recent technological advancements in hardware and software, nuclear medicine diagnostic devices, which are medical equipment, have also made great progress. [0003] This nuclear medicine diagnostic apparatus includes a measurement unit called a gamma camera, and is used for nuclear medicine examination of a subject. As described above, a drug labeled with a radioactive isotope (hereinafter referred to as RI) is administered into the subject, and the RI distribution in the body is imaged with a gamma camera to perform a nuclear medicine examination. Among the main methods of nuclear medicine in...

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Problems solved by technology

[0007] However, in the case of the above-mentioned breath-synchronized data collection, basically, since the collection statistics corresponding to one phase are reduced, there is a problem that statistical noise and other disturbances are large, and there is a problem that image degradation is caused by this.

On the contrary, when the respiratory phase is roughly divided, although the image quality degradation caused by the decrease of the collection statistics can be reduced, the effect of suppressing the body movement caused by the breathing is poor, and the opposite situation is caused.

[0008] Furthermore, the above-mentioned breath-synchronized data collection is performed with a breath-synchronized monitor, but it is also pointed out that the breath-synchronized monitor cannot reliably detect the breathing state of the subject.

If such a reliable respiratory state detection cannot be performed, the data collection time will be extended and the collection statistics will be reduced, and the number of patients that can be detected will decrease and the above-mentioned image quality will deteriorate significantly.

[0009] Furthermore, in the case of data collection synchronized with respiration, since it is imaging under the average body motion of the subject over the entire time of one respiration phase for data collection, the difference between the subject and the subject stopping breathing When comparing the data collected in the state, the image quality is unsatisfactory due to the influence of a large amount of body movement caused by breathing.

[0010] On the other hand, as another problematic point, if it is possible to collect data only during the breath stop of the subject and generate an image using only the data collected during the stop of breath, it is possible to suppress the noise caused by the body movement of the subject. Deterioration of positional resolution and contrast, on the contrary, also because no data is collected during breathing, so the number of samples decreases and the smoothness of the image, that is, the problem of sensitivity degradation can be cited

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