| Japanese |
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| Title | シングルフォトンECTによる脳内病巣の定量的評価に関するファントム実験 |
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| Subtitle | 短報 |
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| Authors | 前田敏男*, 松田博史*, 久田欣一*, 山田正人**, 松平正道** |
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| Organization | *金沢大学医学部核医学科, **金沢大学医学部付属病院アイソトープ部 |
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| Journal | 核医学 |
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| Volume | 19 |
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| Number | 4 |
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| Page | 541-544 |
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| Year/Month | 1982/5 |
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| Article | 報告 |
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| Publisher | 日本核医学会 |
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| Abstract | 「I. はじめに」シングルフォトンECTは従来のガンマカメラによる検査よりも病巣検出能がすぐれている. しかしシングルフォトンECTによる定量的評価に関する実験報告はあまりなされていない. トモスキャナーIIの計数率直線性, 均一性, 分解能およびスライス厚さに関する実験結果をすでに報告したが, 今回は脳内病巣の定量的評価について脳ファントムを用いて検討した結果を報告する. 「II. 方法と結果」「1) 装置」ECTはトモスキャナーIIで撮像した. 脳ファントムは, 8.5, 11.5, 14.5および17.5cmの4段階の内径を有する2重円筒を四角形の水槽に固定したものである. 2重円筒の内壁はアルミニウムであり, 外壁はアクリルである. 内壁と外壁は0.8cm離れており, この隙間 (外筒に相当する) に液体を注入できる. 内筒への液体や病巣ファントムの出し入れは四角形の水槽部から行う. 今回は脳ファントムの内径14.5cmの部分を用いて実験を行った. |
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| Practice | 臨床医学：一般 |
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| Keywords | Single photon emission CT, Braine, Phantom study |
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| English |
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| Title | Phantom Study for Quantitative Evaluation of Brain Lesion with Single Photon Emission Computed Tomography |
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| Subtitle | Short Communication |
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| Authors | Toshio MAEDA*, Hiroshi MATSUDA*, Kinichi HISADA*, Masato YAMADA**, Masamichi MATSUDAIRA** |
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| Authors(kana) | |
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| Organization | *Department of Nuclear Medicine, Kanazawa University, **Division of Central Radioisotope, Kanazawa University |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 19 |
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| Number | 4 |
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| Page | 541-544 |
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| Year/Month | 1982/5 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] A phantom study with Tomogscanner II was performed to evaluate the quantitative measurement of the size and radioactivity of hot lesions in a brain phantom with rim. The profile activity curve crossing the widest portion of the lesion was obtained, and the width at a half maximum of the activity curve was determined as a measured size of the lesion. The measured size correlated well with the actual size of the lesion if the peak count in the lesion was greater than the count of the peripheral rim. But if the per pixel count of the peripheral rim was greater than that of the lesion, the measured size increased more than the actual size. The total count in the hot lesion in air correlated well with the true concentration in the lesion, even in a small lesion such as 1.5 cm in diameter. The peak or plateau count in the lesion larger than 3.0 cm in diameter also correlated with the true concentration in the lesion, but the peak count in the smaller lesion was dependent on its size. The relationship between the count in the reconstructed image and the true radioactivity in the lesion showed a linear response in the brain phantom filled with diluted 99mTcO4-solution, but the slope of the regression curve was less than 1. This discrepancy may be due to contamination with compton scatter radiations and inadequacy of a filter function used. |
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| Practice | Clinical medicine |
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| Keywords | Single photon emission CT, Braine, Phantom study |
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