| Japanese |
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| Title | γ線による透過型CTデータを用いたシングルフォトンECTにおける吸収補正 |
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| Subtitle | 原著 |
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| Authors | 尾川浩一*, 高木八重子*, 久保敦司*, 橋本省三*, 三宮敏和*, 岡野義幸*, 諸角建**, 中島真人**, 油田信一*** |
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| Authors(kana) | |
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| Organization | *慶應義塾大学医学部放射線科学教室, **理工学部電気工学科, ***筑波大学電子情報工学系 |
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| Journal | 核医学 |
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| Volume | 22 |
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| Number | 4 |
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| Page | 477-490 |
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| Year/Month | 1985/4 |
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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」シングルフォトンエミッションCTの新しい吸収補正アルゴリズムについてその臨床応用の際に生ずる問題点に対して検討を加えた. この吸収補正手法は被検体内における吸収係数の分布を正確に吸収補正の反復修正計算の過程に反映させるために, 外部線源による透過型のCTを施行し, これに基づいて計算されたγ線の吸収係数分布画像からコレクションマトリックスを算出し吸収補正を行っている. 本論文ではγ線の吸収係数値の正確さが補正画像に与える影響, および統計変動が補正計算のプロセスに与える影響について調査するために実施した, 計算機シミュレーションおよび基礎実験の結果を示し, 本手法の臨床レベルのデータに対する有効性を示した. また, 臨床応用も試み良好な結果が得られた. |
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| Practice | 臨床医学：一般 |
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| Keywords | Single photon emission CT, Correction matrix, Iterative correction, Transmission data, Emission data |
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| English |
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| Title | An Attenuation Correction Method of Single Photon Emission Computed Tomography Using Gamma Ray Transmission CT |
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| Subtitle | Original Articles |
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| Authors | Koichi OGAWA*, Yaeko TAKAGI*, Atsushi KUBO*, Syouzou HASHIMOTO*, Toshiyuki SANNMIYA*, Yasuyuki OKANO*, Tatsuru MOROZUMI**, Masato NAKAJIMA**, Shin-ichi YUTA*** |
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| Authors(kana) | |
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| Organization | *Department of Radiology, School of Medicine, Keio University, **Department of Electrical Engineering, Faculty of Science and Technology, ***Institute of Information Science and Electronics, the University of Tsukuba |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 22 |
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| Number | 4 |
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| Page | 477-490 |
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| Year/Month | 1985/4 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] In this paper we discussed some problems which occur in the clinical application of a new absorption correction algorithm based on the correction matrix method. The attenuation correction of a distorted image caused by interactions of gamma rays with various tissues is a major problem in the single photon emission computed tomography. So an accurate distribution of gamma ray attenuation coefficient is necessary to reconstruct a quantitative image of radioisotope's distribution. In the new algorithm the correction matrix is constructed with the distribution of attenuation coefficient calculated using measured projections of gamma ray transmission computed tomography data. And the modification of the distorted image is performed iteratively based on the correction matrix method. To confirm the effectiveness of the proposed algorithm, we made simulations and fundamental experiments about its validity in the clinical level and discussed from following standpoints. First, we discuss about the influence of the distribution of attenuation coefficient to corrected images calculated in the process of the iterative correction. Second, we discuss also about the statistical noise intermixed inevitably in the process of data aquisition. The results of computer simulation and fundamental experiments showed its validity. And we also show the results of clinical study applied this algorithm. |
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| Practice | Clinical medicine |
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| Keywords | Single photon emission CT, Correction matrix, Iterative correction, Transmission data, Emission data |
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