| Japanese |
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| Title | Subtraction radioisotopic angiographyの基礎的並びに臨床的検討 |
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| Subtitle | 原著 |
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| Authors | 仙田宏平*, 佐々木常雄*, 三島厚*, 小原健*, 松原一仁*, 小林英敏*, 改井修*, 石口恒男*, 真下伸一*, 大鹿智*, 児玉行弘*, 岡江俊治* |
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| Organization | *名古屋大学医学部放射線医学教室 |
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| Journal | 核医学 |
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| Volume | 18 |
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| Number | 1 |
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| Page | 1-12 |
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| Year/Month | 1981/1 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「要旨」 循環系の各血流成分を限局的に選択描画することによってRI angiographyの有用性を向上させる目的で, 医用コンピュータによる減算処理法を基礎的並びに臨床的に検討した. まず, ファントム実験で得た連続画像について, 撮像時相による放射能濃度分布の変化を調べ, また減算処理を試みたところ, 減算処理に際しては連続画像の適当な時相部分を加算処理して得た被減および減画像を用意する必要を認めた. 次に, 臨床で得た連続画像に減算処理を試みたところ, 減算画像の画質は選択描画領域の大きさ, 画素計数の量およびartifactの出現程度によって左右されることを認めた. そこで, 減算画像の画質を向上させるため, artifactの除去法など種々の工夫を行った. その結果, 減算画像は心大血管の各領域あるいは肝など腹部臓器を選択的に描画し, それらの血流異常を適確に描出できた. 中でも, 短絡血流など限局的な血流を明瞭に描画できたことは意義が深かった. |
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| Practice | 臨床医学：一般 |
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| Keywords | Radioisotopic angiography, Subtraction processing. |
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| English |
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| Title | Fundamental and Clinical Evaluation of Subtraction Radioisotopic Angiography |
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| Authors | Kouhei SENDA, Tsuneo SASAKI, Atsushi MISHIMA, Ken OHARA, Kazuhito MATSUBARA, Hidetoshi KOBAYASHI, Osamu KAII, Tsuneo ISHIGUCHI, Shinichi MASHITA, Satoru OHSHIKA, Yukihiro KODAMA, Shunji OKAE |
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| Authors(kana) | |
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| Organization | Department of Radiology, School of Medicine, Nagoya University |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 18 |
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| Number | 1 |
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| Page | 1-12 |
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| Year/Month | 1981/1 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] Subtraction processing of radioisotopic angiography with a medical minicomputer was studied in order to improve the clinical usefulness by demonstrating the regional blood flow components selectively in the circulation system. Methods for the processing were evaluated in considering the changes in distribution of radioactivity on original sequential images obtained from a phantom experiment and clinical examinations. Minuend and subtahend images, which demonstrated different distribution in radioactivity with sufficient counts, were prepared by addition processing of original sequential images in suitable phases before subtraction processing. Image quality of the subtraction image obtained was recognized to be affected by area of the region imaged selectively, counts in each element of the image and appearance of artifact. Several procedures were devised to make the image quality improve in practice. Artifact image was reduced by processing subtrahend image with correction factor which was calculated by a ratio of counts in the same region of interest on both the minuend and subtrahend image. In the clinical application, the processing was able to show each ragional component of the heart and great vessels and blood flow image of the liver and kidneys so definetely that lesions with abnormal blood flow in the organs were disclosed more clearly than those detected on the original images. It was especially significant that a regional blood flow component in the organ such as shunt in the heart or different blood flow phase in the liver was clearly visualized. |
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| Practice | Clinical medicine |
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| Keywords | Radioisotopic angiography, Subtraction processing. |
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