| Japanese |
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| Title | 非焦点型矩形スリットコリメーターのMTF及び情報容量 |
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| Subtitle | 原著 |
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| Authors | 西沢邦秀* |
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| Authors(kana) | |
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| Organization | *名古屋大学医学部放射線医学教室 (主任 : 高橋信次教授) |
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| Journal | 核医学 |
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| Volume | 11 |
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| Number | 1 |
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| Page | 1-6 |
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| Year/Month | 1974/2 |
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| Article | 原著 |
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| Publisher | 日本核医学会 |
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| Abstract | 「緒言」シンチカメラあるいはスキャナーによる面スキャンによつてシンチグラム像を得る際のコリメーターを含めた測定系の情報伝達特性はMTFや情報容量で表されている. リニヤスキャンにより人体内アイソトープ分布の再現及び定量を行う際に非焦点型矩形スリットコリメーターはよく用いられる. ところがリニヤスキャンを行う測定系の情報伝達特性を情報容量を用いて評価した例は見られないように思われる. そこで非焦点型矩形スリットコリメーターを装着した系の情報伝達特性をMTFと情報容量で表し, 同時に系の特性を表現するこの2つの方法の得失を論ずる. 「研究方法」陰イオン交換樹脂を塩酸酸性の203Hg溶液で処理し, 乾燥させ0.3mmΦの点線源とした. 図1のごとく3インチシンチスキャナーに非焦点型矩形スリットコリメーターを装着して測定を行つた. コリメーターのスリット幅は可変であり, 長さ15cm, 厚さは鉄1cmである. |
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| Practice | 臨床医学：一般 |
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| English |
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| Title | Modulation Transfer Function and Information Capacity of Unfocussed Rectangle Slit Collimator |
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| Subtitle | Original |
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| Authors | Kunihide NISHIZAWA |
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| Authors(kana) | |
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| Organization | Department of Radiology, Nagoya University School of Medicine |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 11 |
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| Number | 1 |
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| Page | 1-6 |
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| Year/Month | 1974/2 |
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| Article | Original article |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary]The information transmitting character of unfocussed rectangle slit collimator system, which is used for restoration of radionuclides in human body and quantitation, was investigated by modulation transfer function (MTF) and entropy (information capacity) and the following results were obtained. The vertical displacement of radionuclides in human body to crystal causes to smooth the profile scanning curve rather than slit width variation. MTF became worth and entropy decreased with increasing the slit width and distance between source plane and crystal surface. The resolving power can be denoted by "bit" of entropy also as well as MTF and the system having larger value of entropy have better resolution. MTF is superior to entropy in the description of information transmitting character of collimator system, on the other hand entropy is superior to and simpler than MTF for the description of character as entire system. |
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| Practice | Clinical medicine |
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| Keywords | |
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