Japanese
Title画像再構成角度が心筋SPECT像に与える影響 - 180度像と360度像との比較 -
Subtitle原著
Authors柏倉健一*, 小林秀樹*, 百瀬満*, 柏倉明美*, 金谷信一*, 日下部きよ子*
Authors(kana)
Organization*東京女子医科大学放射線科
Journal核医学
Volume33
Number4
Page375-382
Year/Month1996/4
Article原著
Publisher日本核医学会
Abstract「要旨」Thallium-201(201Tl)とtechnetium-99m(99mTc)心筋血流SPECT像において同一360度投影データより360度, 180度分のデータを用いて再構成した画像(360度像, 180度像)間の違いを正常例, 局所灌流異常例の双方について検討した. この結果, 201Tlの正常例において180度像は360度像よりも区域間のカウントのばらつきは小さく, 両像の違いは, 右心室, 前壁, 側壁でとりわけ顕著であった. 局所灌流異常例において灌流異常部/正常域のコントラスト(以下欠損コントラストとする)は180度像が360度像よりも高かった. 一方99mTcでは, 360度像は180度像よりも区域間のカウントのばらつきは小さく, 両像の違いは, 右心室, 心尖部, 前壁, 下壁で顕著であった. 欠損コントラストは201Tlと同様180度像が360度像よりも高かった. また, 201TIと99mTc像を比較した場合, 360度, 180度像における欠損コントラストの違いは下・後壁で有意であった(p<0.05). これらの欠損コントラストは, 欠損の解剖学的位置, 画像再構成角度, 光子エネルギーに依存すると考えられた.
Practice臨床医学：一般
KeywordsSPECT system, 180°and 360°arc, 99mTc and 201Tl, Lesion contrast.
English
TitleEffect of Reconstruction Arc in Myocardial SPECT Imaging - Comparison between 180°and 360°Arc -
SubtitleOriginal Articles
AuthorsKenichi KASHIKURA, Hideki KOBAYASHI, Mitsuru MOMOSE, Akemi KASHIKURA, Shinichi KANAYA, Kiyoko KUSAKABE
Authors(kana)
OrganizationDepartment of Radiology, Tokyo Women's Medical College
JournalThe Japanese Journal of nuclear medicine
Volume33
Number4
Page375-382
Year/Month1996/4
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary]A series of thallium-201(201Tl)and technetium-99m(99mTc)myocardial perfusion images with or without perfusion defects were acquired by 360°arc using a triple-head camera. The vertical long, horizontal long, and short axis images of 201Tl and 99mTc with 360°, 180°, and opposite 180°were identically reconstructed and reoriented without attenuation correction. In order to detect the detailed differences between 360°(30°-390°)and 180°(30°-210°)images, the opposite 180°(210°-30°)images were utilized. Opposite 180°images revealed the contribution of those to the 360°images. In the normal perfusion images, the CV(coefficient of variation)of the counts in 360°images with 201Tl by the segments was larger than 180°images. On the contrary, the CV of the counts in 360°images with 99mTc was smaller than 180°images. This difference, caused by the difference of photon energy, were detected mainly as the extent of counts decreasing in the deep segments in the opposite 180°images. Lesion contrasts of the opposite 180°images were lower than those of 180°images due to distance related collimator response(the detector response of the collimated gamma camera varies with source-to-detector distance)and scatter. Therefore, lesion contrasts were more decreased in the 360°images compared with those of 180°images, especially in the segments of lateral and anterior walls. The differences in lesion contrasts between 201Tl and 99mTc images were mainly in the segments of inferior and posterior walls(p<0.05). Lesion contrast was dependent on the location of the perfusion defects, reconstruction arc, and photon energy.
PracticeClinical medicine
KeywordsSPECT system, 180°and 360°arc, 99mTc and 201Tl, Lesion contrast.

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