Minimizing the acquisition phase in coronary CT angiography using the second generation 320-row CT

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• 作者：Nobuo Tomizawa (1) (2)
  Shigeaki Kanno (1)
  Eriko Maeda (1)
  Masaaki Akahane (1) (3)
  Rumiko Torigoe (4)
  Kuni Ohtomo (1)
  
• 关键词：Acquisition phase ; Coronary CT angiography ; Image quality ; 320 ; row CT
• 刊名：Japanese Journal of Radiology
• 出版年：2014
• 出版时间：July 2014
• 年：2014
• 卷：32
• 期：7
• 页码：391-396
• 全文大小：273 KB
• 参考文献：1. Hsiao EM, Rybicki FJ, Steigner M. CT coronary angiography: 256-slice and 320-detector row scanners. Curr Cardiol Rep. 2010;12:68-5. CrossRef
  2. Steigner ML, Otero HJ, Cai T, Mitsouras D, Nallamshetty L, Whitmore AG, et al. Narrowing the phase window width in prospectively ECG-gated single heartbeat 320-detector row coronary CT angiography. Int J Cardiovasc Imaging. 2009;25:85-0. CrossRef
  3. Tomizawa N, Nojo T, Akahane M, Torigoe R, Kiryu S, Ohtomo K. Adaptive iterative dose reduction in coronary CT angiography using 320-row CT: assessment of radiation dose reduction and image quality. J Cardiovasc Comput Tomogr. 2012;6:318-4. CrossRef
  4. Tomizawa N, Nojo T, Akahane M, Torigoe R, Kiryu S, Ohtomo K. Shorter delay time reduces interpatient variability in coronary enhancement in coronary CT angiography using the bolus tracking method with 320-row CT. Int J Cardiovasc Imaging. 2013;29:185-0. CrossRef
  5. Chen MY, Steigner ML, Leung SW, Kumamaru KK, Schultz K, Mather RT, et al. Simulated 50% radiation dose reduction in coronary CT angiography using adaptive iterative dose reduction in three dimensions (AIDR3D). Int J Cardiovasc Imaging. 2013;29:1167-5. CrossRef
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  7. Raff GL, Abidov A, Achenbach S, Berman DS, Boxt LM, Budoff MJ, et al. SCCT guidelines for the interpretation and reporting of coronary computed tomographic angiography. J Cardiovasc Comput Tomogr. 2009;3:122-6. CrossRef
  8. Tomizawa N, Komatsu S, Akahane M, Torigoe R, Kiryu S, Ohtomo K. Relationship between beat to beat coronary artery motion and image quality in prospectively ECG-gated two heartbeat 320-detector row coronary CT angiography. Int J Cardiovasc Imaging. 2012;28:139-6. CrossRef
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  10. Halliburton SS, Abbara S, Chen MY, Gentry R, Mahesh M, Raff GL, et al. SCCT guidelines on radiation dose and dose-optimization strategies in cardiovascular CT. J Cardiovasc Comput Tomogr. 2011;5:198-24. CrossRef
  11. Zhang C, Zhang Z, Yan Z, Xu L, Yu W, Wang R. 320-row CT coronary angiography: effect of 100-kV tube voltages on image quality, contrast volume, and radiation dose. Int J Cardiovasc Imaging. 2011;27:1059-8. CrossRef
  12. Motoyama S, Sarai M, Harigaya H, Anno H, Inoue K, Hara T, et al. Computed tomographic angiography characteristics of atherosclerotic plaques subsequently resulting in acute coronary syndrome. J Am Coll Cardiol. 2009;54:49-7. CrossRef
  
• 作者单位：Nobuo Tomizawa (1) (2)
  Shigeaki Kanno (1)
  Eriko Maeda (1)
  Masaaki Akahane (1) (3)
  Rumiko Torigoe (4)
  Kuni Ohtomo (1)
  
  1. Department of Radiology, The University of Tokyo, Tokyo, Japan
  2. Department of Radiology, New Tokyo Hospital, 1271 Wanagaya, Matsudo city, Chiba, 270-2232, Japan
  3. Department of Radiology, NTT Medical Center Tokyo, Tokyo, Japan
  4. Toshiba Medical Systems Corporation, Tokyo, Japan
  
• ISSN：1867-108X

文摘

Purpose We aimed to compare the radiation dose and image quality of a minimal phase window centered at 77?% compared with a wide phase window in coronary CT angiography using the second-generation 320-row CT. Materials and methods Eighty patients with heart rate ?5?bpm were retrospectively included. The first 40 patients underwent scanning with a wide phase window (65-5?%), while the last 40 patients underwent scanning with a minimal phase window centered at 77?%. Subjective image quality was graded using a 4-point scale (4 = excellent). Image noise and contrast-to-noise ratio at the proximal segments were also analyzed. The mean effective dose was derived from the dose length product multiplied by a chest conversion coefficient (κ?=?0.014?mSv?mGy??cm?). Results Minimal phase window scanning centered at 77?% reduced the radiation dose by 30?% compared with wide phase window scanning (1.7 vs 2.4?mSv, p?=?0.0009). The subjective image quality showed no significant difference (3.75 vs 3.76, p?=?0.77). No significant difference was observed in the image noise, CT number, and contrast-to-noise ratio. Conclusions Radiation dose could be reduced while maintaining image quality by use of a minimal phase window centered at 77?% compared with a wide phase window in coronary CT angiography using the second generation 320-row CT.