4.シングルフォトンECT法の応用(第39回総会)(II.ECT画像とその性能評価)

概要

論文の詳細を見る
The single photom emission CT method (SPECT) using a rotating scintillation camera has rapidly been spreading because of its handiness and usefulness. However, it has some questions theoretically. We studied the quantative capability of SPECT by phantom experiments. Although the ECT values in the reconstructed image were highly quantitative compared with algorithm in the planar image, it was imposible to estimate absolute activities from the ECT values because of theoretical difficulty in corrections of scattering and absorption. We attempted, on some assumptions, a simultaneous correction for scattering and absorption using an interative convolution counts by Walter et al., considering elimination of scattering and improved the quality of the image. The distribution of absorption coefficients in the tomographic plane was obtained by the transmission CT data using ^<99m>Tc flood source, and corrected, assuming that these data are associated with compton scattering less than 90°. It reduced the scattering and improved the reliability of ECT values. As clinical applications, we have reported on the measurements of organ volumes, the ECT method for cerebral blood flow distribution by continuous ^<81m>Kr infusion, the functional ECT image in hepatobiliary scintigraphy, and the gated cardiac blood pool ECT method. We have further suggested that an application for dynamic study will increase in conjunction with the spread of the ring type SPECT equipment.
社団法人日本放射線技術学会の論文
1983-07-01

4.シングルフォトンECT法の応用(第39回総会)(II.ECT画像とその性能評価)

スポンサーリンク

概要

著者

関連論文

スポンサーリンク