5.Rotating Slant Hole Tomographyの基礎的検討とその臨床的有用性(第39回総会)(II.ECT画像とその性能評価)

概要

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To determine the usefulness of the rotating slant hole (RSH) tomography, we evaluated its performonce in phantom studies and clinical applications. The uniformity, sensitivity, resolution were satisfiable enough. The fall in axial resolution was associated with a decrease in planar resolution and both were linearly related to the depth. RSH tomography was more sensitive than planar image (by high resolution collimator) in detecting simulated myocardial defects and could be detected small defect (1 cmφ) in air. When the phantom was tilted 30°, the artifact produced by inducing false defect. This may reduce the specificity of the image. It is necessary to make image in a projection that is more nearly perpendicular to the long axis of the left ventricle. We found the RSH tomography could be useful for comparable small organs spleen, kidney, bone tumor and so on. There are some advantages in RSH tomogaphy such as closer distance between the object and collimator, short time for data aquisition and simple technique. On the contrary, there are some limitations such as one projection tomogram, not suitable for large organs and worse resolution in the deep regions.
1983-07-01