DEVELOPMENTAL STUDY ON A NEW TYPE OF COLLIMATOR THE "TOMO-COLLIMATOR"
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概要
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A new system was proposed for gamma-ray longitudinal tomography, using a scintillation camera and a new type of collimator, the 'Tomo-collimator'. The 'Tomo-collimator' is the multichannel collimator with 1400 parallel holes, which can be inclined synchronously (with the movement of the crystal) at an optimal angle to the scintillation crystal under the servo-motor control. This collimator can be also mounted on any standard gamma camera containing a 11.5 inch-crystal. By using this system, the experimental study proved that the resolution of the obtained tomo-scintigram at the focal plane was the same with the 1000 holes collimator's case at plane 8 and plane 11, and the blurring effect of other planes was conspicuous. And furthermore, a 2 cm in diameter cold lesion in the liver phantom filled with 500 μCi of <198>^Au-colloid, which could scarcely be found in the conventional scintigram (and dimly found in the filtered scintigram) was contrasted more clearly on the blurred back ground. The clinical application of this method proved that this tomographic system was useful for detecting the cold lesions in the liver and for obtaining the three dimensional definition. And moreover, the digital filtering resulted in enforcing the significant information. In conclusion, the new system proved to have increased much useful information about the focal plane, which consequently increased the detectability of the cold lesions in the hot substrate, and in addition about the three-dimensional definition.
- 神戸大学の論文