Variability of Repeated Coronary Artery Calcium Scoring and Radiation Dose on 64-slice and 16-slice CT by Prospective Electrocardiograph-triggered Axial and Retrospective Electrocardiograph-gated Spiral CT : A Phantom Study

Academic Radiology 15 巻 8 号 958-965 頁 2008-08 発行
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タイトル ( eng )
Variability of Repeated Coronary Artery Calcium Scoring and Radiation Dose on 64-slice and 16-slice CT by Prospective Electrocardiograph-triggered Axial and Retrospective Electrocardiograph-gated Spiral CT : A Phantom Study
作成者
Horiguchi Jun
Kiguchi Masao
Fujioka Chikako
Shen Yun
Arie Ryuichi
Sunasaka Kenichi
Ito Katsuhide
収録物名
Academic Radiology
15
8
開始ページ 958
終了ページ 965
抄録
Rationale and Objectives: To compare coronary artery calcium scores, the variability and radiation doses on 64-slice and 16-slice CT scanners by both prospective electrocardiograph (ECG)-triggered and retrospective ECG-gated scans.

Materials and Methods: Coronary artery models (n=3) with different plaque CT densities (~240 HU, ~600 HU and ~1000 HU) of four sizes (1 mm, 3 mm, 5 mm and 10 mm in length) on a cardiac phantom were scanned three times in 5 heart rate sequences. The tube current-time-products were set to almost the same on all four protocols (32.7 mAs for 64-slice prospective and retrospective scans, 33.3 mAs for 16-slice prospective and retrospective scans). Slice-thickness was set to 2.5 mm in order to keep the radiation dose low. Overlapping reconstruction with 1.25 mm increment was applied on the retrospective ECG-gated scan.

Results: The coronary artery calcium scores were not different between the four protocols (one-factor ANOVA, Agatston; p=0.32, volume; p=0.19 and mass; p=0.09). Two-factor factorial ANOVA test revealed that the interscan variability was different between protocols (p<0.01) and scoring algorithms (p<0.01). The average variability of Agatston/volume/mass scoring and effective doses were 64-slice prospective scan: 16%/15%/11% and 0.5 mSv, 64-slice retrospective scan: 11%/11%/8% and 3.7 mSv, 16-slice prospective scan: 20%/18%/13% and 0.6 mSv & 16-slice retrospective scan: 16%/15%/11% and 2.9 to 3.5 mSv (depending on the pitch).

Conclusions: Retrospective ECG-gated 64-slice CT showed the lowest variability. Prospective ECG-triggered 64-slice CT, with low radiation dose, shows low variability on coronary artery calcium scoring comparable to retrospective ECG-gated 16-slice CT.
著者キーワード
CT
coronary artery
calcium
radiation dose
NDC分類
医学 [ 490 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
Elsevier Science Inc.
発行日 2008-08
権利情報
Copyright (c) 2008 AUR Published by Elsevier Inc.
出版タイプ Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 1076-6332
[DOI] 10.1016/j.acra.2008.03.007
[NCID] AA11053376
[DOI] http://dx.doi.org/10.1016/j.acra.2008.03.007