| Japanese |
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| Title | 回転型ガンマカメラによる肝ECTの検討 - (1) 基礎的検討 - |
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| Subtitle | 原著 |
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| Authors | 山本和高*, 向井孝夫*, 藤田透*, 湊小太郎*, 玉木長良*, 石井靖*, 鳥塚莞爾* |
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| Organization | *京都大学医学部放射線核医学科 |
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| Journal | 核医学 |
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| Volume | 19 |
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| Number | 6 |
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| Page | 929-934 |
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| Year/Month | 1982/7 |
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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」検出器回転型ガンマカメラを使用したSingle photon emission computed tomography(SPECT)による肝内占拠性病変の検出能を評価するための基礎的な検討をファントームを用いて行った. 画像再構成フィルターは高周波成分の少ないものほど統計雑音が減少し分解能はやや低下するが画質の改善が認められた. SPECTの画質は画像再構成フィルターや収集方向数などいろいろな要因で変化するが, 特に収集するデータ量に影響され, 直径1cmの欠損を描出するには400k counts/slice以上のデータ収集が必要であった. 適切な条件下で実施されたSPECT像は, 従来のシンチグラムでは検出できなかった小さな欠損も描出可能で, コントラストも鮮明になっており, SPECTの有用性が認められた. 「I. はじめに」肝シンチグラムは, 肝疾患, 特に肝腫瘍の疑われた症例に対するスクリーニング検査法として臨床的に広く利用されている. |
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| Practice | 臨床医学：一般 |
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| Keywords | single photon emission computed tomography, liver scintigraphy, liver phantom, cold spot, rotating gamma camera. |
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| English |
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| Title | Evaluation of Single Photon Emission Computed Tomography Using a Rotating Gamma Camera for Detecting Small Space Occupying Lesions in the Liver : (1) Phantom Study |
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| Authors | Kazutaka YAMAMOTO, Takao MUKAI, Toru FUJITA, Kotaro MINATO, Nagara TAMAKI, Yasushi ISHII, Kanji TORIZUKA |
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| Authors(kana) | |
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| Organization | Department of Radiology and Nuclear Medicine, Kyoto University, Faculty of Medicine |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 19 |
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| Number | 6 |
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| Page | 929-934 |
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| Year/Month | 1982/7 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary]Phantom studies were performed under simulated conditions of the human liver in order to evaluate clinical feasibility of single photon emission computed tomography (SPECT) using a rotating gamma camera. A liver-shaped phantom containing solid cylinders of various diameters as cold spots and housed in a ellipsoid phantom was employed in this study. Several filters for reconstructing SPECT images were evaluated. A filter with sufficient cut at high frequency band such as proposed by Chesler resulted in appropriate image quality at the expense of a slight decrease of resolution capability. The number of projections, 32, 64 and 128 views, made no remarkable change of image quality. The total counts collected per slice were seemed to affect the image quality considerably and approximately 400 kcounts per slice appeared to be a minimum acceptable threshold to resolve a cold spot as small as 10 mm in diameter. Attenuation correction was made by the Sorenson's method. Although attenuation coefficient of 140 keV γ-ray in the water is 0.15 cm-1, a lower value of 0.1cm-1 revealed to be suitable to restore the attenuation loss at the central part of the phantom. By the use of SPECT under suitable conditions, small cold spots which could not be detected by conventional planar imaging were resolved with excellent contrast. In conclusion, SPECT was considered to be a very useful modality for screening small space occupying lesions in the liver. |
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| Practice | Clinical medicine |
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| Keywords | single photon emission computed tomography, liver scintigraphy, liver phantom, cold spot, rotating gamma camera. |
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