| Japanese |
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| Title | 頭部SPECTにおける頭蓋骨を考慮した散乱線の定量 |
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| Subtitle | 原著 |
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| Authors | 前田繁*, 尾川浩一* |
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| Authors(kana) | |
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| Organization | *法政大学工学部電気工学科 |
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| Journal | 核医学 |
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| Volume | 31 |
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| Number | 5 |
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| Page | 431-439 |
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| Year/Month | 1994/5 |
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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」頭部SPECTにおいて, エネルギーウインドウ内に混入する散乱線の割合を評価するためにモンテカルロシミュレーションを行った. シミュレーションでは, パラメータとして頭蓋骨の厚さ(0.5, 1.0, 1.5cm)や密度(1.55, 1.70, 1.85g/cm3), 投与する核種の種類(99mTc:141keV, 123I:159keV)を変化させ, プラナー画像におけるエネルギースペクトル, エネルギーウインドウ内の散乱線の割合を計算した. この結果, 頭蓋骨が存在しない場合の(散乱線)/(一次線)の割合がほぼ0.23-0.25であるのに対し, 頭蓋骨が存在すれば, その厚さや密度が増大するにつれて, この比が0.28-0.42まで変化することが明らかになった. |
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| Practice | 臨床医学：一般 |
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| Keywords | Monte Carlo method, Single photon emission CT, Compton scattering, Image processing, Skull bone. |
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| English |
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| Title | Quantitative Assessment of Scattered Photons Considering Skull Bone in Brain SPECT |
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| Subtitle | Original Articles |
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| Authors | Shigeru MAEDA, Koichi OGAWA |
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| Authors(kana) | |
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| Organization | Department of Electrical Engineering, College of Engineering, Hosei University |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 31 |
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| Number | 5 |
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| Page | 431-439 |
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| Year/Month | 1994/5 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary] A Monte Carlo simulation was performed to estimate scattered photons generated in skull bone in brain SPECT. In the simulation, we used cylindrical phantoms which consisted of water and calcium. We calculated energy spectra of planar images and the scatter fractions, which were defined by the ratio of the scattered photons to primary photons, within the energy windows of 20 % centered at the photopeak energy. For radionuclides [99mTc (141 keV), 123I (159 keV)], we changed the following parameters: the thickness of the calcium layer (0.0, 0.5, 1.0, 1.5 cm) and its density (1.55, 1.70, 1.85g/cm3). The results showed that the shape of the energy spectra depended on the photon energy, the thickness of skull and its density. Consequently, the scatter fractions within the energy windows varied from 0.23 to 0.25 (without skull) and from 0.28 to 0.42 (with skull). |
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| Practice | Clinical medicine |
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| Keywords | Monte Carlo method, Single photon emission CT, Compton scattering, Image processing, Skull bone. |
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