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CT tube current for attenuation map in a combined PET/CT system: obese patient simulated phantom study
http://hdl.handle.net/2297/30317
http://hdl.handle.net/2297/303171c7a0aa8-b00a-404d-89c1-d1f7d60fe069
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
ME-PR-ONOGUCHI-M-359.pdf (601.0 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2017-10-03 | |||||
| タイトル | ||||||
| タイトル | CT tube current for attenuation map in a combined PET/CT system: obese patient simulated phantom study | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者 |
Nagaki, Akio
× Nagaki, Akio× Onoguchi, Masahisa× Matsutomo, Norikazu |
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| 書誌情報 |
Annals of Nuclear Medicine 巻 26, 号 4, p. 359-364, 発行日 2012-05-01 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 0914-7187 | |||||
| NCID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA10708017 | |||||
| DOI | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1007/s12149-012-0584-5 | |||||
| 出版者 | ||||||
| 出版者 | Springer Verlag (Germany) / The Japanese Society of Nuclear Medicine | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Objective: The CT portion of PET/CT provides attenuation correction of the PET emission scan. This study was performed to evaluate how much the CT tube current can be lowered while still providing attenuation maps on PET images. Methods: Two body phantoms (outside diameters of 300 and 500 mm) were used to investigate, and PET/CT acquisitions were performed with an Aquiduo PCA-7000B (Toshiba Medical Systems, Otawara, Japan). The CT scan was performed with the following parameters (120 kVp; 0.5-s rotation; 10, 20, 40, 80, 160, 200, 320, 460 mA). After the CT scan, PET images for 18F-FDG (5.3 kBq/mL) were obtained for 4 min/bed position. The linear attenuation coefficients for 18F-FDG in 300- and 500-mm phantoms, pixel values and SD of CT images, radioactivity concentration values and hot- and cold-sphere contrast on PET images in the 500-mm phantom were evaluated. Results: In the 300-mm phantom, all eight tube currents gave average linear attenuation coefficients of approximately 0.095 cm -1. In contrast, the average linear attenuation coefficients of the 500-mm phantom at 10, 20, and 40 mA were significantly decreased (0.081, 0.087, and 0.092 cm -1, respectively; p < 0.05) as compared to 0.096 cm -1 of the other tube currents. Further, CT pixel values decreased 10 and 20 mA. Thus, the background radioactivity concentration values at 10 and 20 mA were substantially underestimated to be 57 and 80%, respectively (p < 0.05); the hot-sphere contrast values at 10 and 20 mA were 0.26 and 0.29; the cold-sphere contrast values at 10, 20, and 40 mA were -0.33, -0.16, and 0.08. Conclusions: Although the linear attenuation coefficients in the 300-mm phantom remained the same with varying CT tube currents, the 500-mm phantom yielded significant differences in the range 10-40 mA. Therefore, the CT tube currents for attenuation correction should be adjusted over 40 mA in obese patients. © 2012 The Japanese Society of Nuclear Medicine. | |||||
| 著者版フラグ | ||||||
| 出版タイプ | AM | |||||
| 出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
