| Japanese |
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| Title | PETの3次元収集における被検体の形状と計数率特性の関係 |
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| Subtitle | 技術報告 |
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| Authors | 山本誠一*, 三浦修一**, 飯田秀博**, 菅野巖** |
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| Authors(kana) | |
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| Organization | *島津製作所医用技術部(現所属 ; 神戸高専電気工学科), **秋田県立脳血管研究センター |
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| Journal | 核医学 |
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| Volume | 33 |
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| Number | 4 |
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| Page | 435-441 |
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| Year/Month | 1996/4 |
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| Article | 報告 |
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| Publisher | 日本核医学会 |
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| Abstract | 「要旨」PETにおける3次元(3D)収集において2次元(2D)収集より画質の向上が期待できる放射能濃度の範囲を複数の直径と長さのファントムを用いた計数率特性の実験により求めた. 画質の評価はNoise Equivalent Count Rate(NECR)を指標とした. その結果20 cm直径, 15 cm長さのファントムに対しては, 1.2μCi/ml以上で3Dより2DのほうがNECRは高くなった. 30 cm直径, 15cm長さのファントムに対しては, 0.7μCi/ml以上で2Dの方が高くなることがわかった. 14cm直径, 長さ25 cmのファントムに対する3DのNECRは, 長さ15 cmに比べピークが低くなった. これらの結果より, 投与量が少ない場合は3D収集は有効であるが, 一定濃度以上では2Dの方が画質が良くなることが明らかになった. 直径の大きな部位や長い部位では, より低い濃度で3Dの有効性がなくなることがわかった. |
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| Practice | 臨床医学：一般 |
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| Keywords | PET, 3D acquisition, Count rate, NECR. |
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| English |
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| Title | Observation of Relation between Object Size or Length and Count Rate for 3D PET |
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| Subtitle | Technical Reports |
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| Authors | Seiichi YAMAMOTO*, Shuichi MIURA**, Hidehiro IIDA**, Iwao KANNO** |
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| Authors(kana) | |
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| Organization | *Shimadzu Corporation(Kobe City College of Technology), **Department of Radiology, Akita Research Institute for Brain and Blood Vessels |
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| Journal | The Japanese Journal of nuclear medicine |
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| Volume | 33 |
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| Number | 4 |
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| Page | 435-441 |
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| Year/Month | 1996/4 |
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| Article | Report |
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| Publisher | THE JAPANESE SOCIETY OF NUCLEAR MEDICINE |
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| Abstract | [Summary]We obtained the concentration range of better S/N in 3D than 2D acquisition by measuring count rate for phantoms of different size and length. We used noise equivalent count rate(NECR)for evaluation of S/N of images. For 20 cm diameter 15cm length cylindrical phantom, NECR of 2D was higher than that of 3D more than 1.2μCi/ml. For 30 cm diameter 15 cm length cylindrical phantom, NECR of 2D was higher than that of 3D more than 0.7 μCi/ml. For 14 cm diameter 25 cm length cylindrical phantom, NECR of 3D was lower than that of 25 cm length phantom. With these results, though 3D is useful when administered dose is small, image quality of 2D becomes better than 3D more than a certain concentration. For the larger diameter or longer object, the advantage of 3D is diminished at lower concentration. |
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| Practice | Clinical medicine |
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| Keywords | PET, 3D acquisition, Count rate, NECR. |
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