オフセット再構成によるSPECT像の検討 : オフセット・ディテクタ方式を応用して

概要

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When SPECT images are reconstructed, 60 projection data-sets are produced if data are collected in a 360-degree sweep at a sampling angle of 6 degrees. This in involves 30 projection(=60×1/2)because data are also collected by the opposing detector located opposite(180 degrees)the primary detector. With the off-set reconstruction method, data are collected in a 360-degree sweep at angles of 6 degrees, but one detector collects data from 0 to 180 degrees, and the opposing detector collects data at two non-opposing angles, which are 183 degrees instead of 180 degrees from each other. When images obtained using this method were compared with conventional SPECT images, it was found that the off-set reconstruction SPECT images were superior in terms of uniformity of the columnar phantom, the ability to image hot spots, uniformity of the myocardial phantom, and the ability to quantify defects. When this technique was used in healthy individuals, the ability to image the cardiac lumen was better than ever, and high-quality images were obtained. Although the off-set reconstruction method is based on data collected at a sampling angle of degress, the apparent projection data obtained by this method resemble data collected at a sampling angle of 3 degrees.
社団法人日本放射線技術学会の論文
1998-08-20