Japanese
TitleTl-201心筋ファントムにおけるSPECT斜断層再構成の再現性と定量性の検討
Subtitle原著
Authors分校久志*, 南部一郎*, 関宏恭*, 渡辺直人*, 隅屋寿*, 山田正人**, 松平正道**, 飯田泰治**, 多田明*, 中嶋憲一*, 滝淳一*, 利波紀久*, 久田欣一*
Authors(kana)
Organization*金沢大学医学部核医学教室, **アイソトープ部
Journal核医学
Volume21
Number6
Page723-730
Year/Month1984/6
Article原著
Publisher日本核医学会
Abstract「要旨」負荷Tl-201心筋SPECTにおける, washoutの評価に対する基礎的検討として, 心筋ファントムを用いて, 斜断層再構成像の再現性, 定量性の検討を行った. 再現性は, 検者間で変異係数(C.V.)平均6.7%以下, 検者内で3.3%(C.V.)以下と良好であった. 斜断層再構成における, 欠損部位置の変動は, CFPの1サンプリング点(6°)以内であった. スライス位置の変動は, 0.6スライス以下と, わずかであった. 計数の直線性は壁厚16mm以上では約6%の過大評価のみと, 良好であった. 心筋Tl-201 SPECTによる3次元立体再構成は, 絶対的な定量評価には限界があるが, 再現性, 計数の直線性はともに良好であり, 心筋局所ごとのTI-201の経時的, 相対的定量測定, すなわち, wash-outの測定には, 欠損部を除き, 十分利用可能と考えられた.
Practice臨床医学：一般
KeywordsTl-201, SPECT, Oblique angle reconstruction, Reproducibility, Quantitatibity.
English
TitleReproducibility and Quantitativity of Oblique-angle Reconstruction in Single Photon Emission Computed Tomography Using Tl-201 Myocardial Phantom
SubtitleOriginal Articles
AuthorsHisashi BUNKO*, Ichiro NANBU*, Hiroyasu SEKI*, Naoto WATANABE*, Hisashi SUMIYA*, Masato YAMADA**, Masamichi MATSUDAIRA**, Taiji IIDA**, Akira TADA*, Kenichi NAKAJIMA*, Norihisa TONAMI*, Kinichi HISADA*
Authors(kana)
Organization*Department of Nuclear Medicine, **Department of Radioisotope Technology, Kanazawa University Hospital
JournalThe Japanese Journal of nuclear medicine
Volume21
Number6
Page723-730
Year/Month1984/6
ArticleOriginal article
PublisherTHE JAPANESE SOCIETY OF NUCLEAR MEDICINE
Abstract[Summary]Three-dimensional oblique-angle reconstruction is necessary for visualization of all of the myocardial segments in Tl-201 myocardial single photon emission computed tomography (SPECT). In oblique-angle reconstructed SPECT, exact correspondance of each myocardial segments is quite important for quantitative evaluation of Tl-201 myocardial wash-out from stress and redistribution images. This study was carried out in order to evaluate reproducibility and quantitativity of oblique-angle reconstruction of myocardial phantom SPECT. Myocardial phantom with transmural and subendcardial defects, and off-axis phantom with wall thickness changing continuously from 0 to 23 mm were used. Sixty projection data in every 6°were aquired using dual-camera (ZLC) with high resolution collimators connected to Scintipac-2400 computer system. Oblique-angle reconstructed images were obtained by indicating the long axis of the phantom manually in the transaxial and vertical long axial tomograms. Reproducibility and quantitativity were evaluated by creating circumferential profile (CFP) of the finally reconstructed short axial images. Inter- and intra-operater reproducibility of relative counting ratio were less than 6.7% (C. V. ) and 3.3% (C. V. ), respectively. Both inter-and intraoperater reproducibility of absolute counts were better than that of counting ratio (less than 5.1% (C. V. ) and 2.9% (C. V. ), respectively). Variation of defect location in the reconstructed image and between the slices were less than 1 sampling interval of CFP (6°) and 0.6 slice, respectively. Quantitativity of counts in the reconstructed images was poor in the transmulal defect, but was fair in the subendocardial defect. Counting ratio was greatly affected by wall thickness. Temporal quantitatibity or linearity of the counts in sequential SPECTs was good in non-defect area, especially when wall thickness was greater than 70% (16mm) of maximum. In conclusion, three-dimensional oblique-angle reconstruction in Tl-201 myocardial SPECT could be applicable to relative and temporal quantitation of local myocardial activity other than defect area for the quantitative evaluation of Tl-201 myocardial wash-out.
PracticeClinical medicine
KeywordsTl-201, SPECT, Oblique angle reconstruction, Reproducibility, Quantitatibity.

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