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The feasibility of halfcycle reconstruction in high heart rates in coronary CT angiography using 320-row CT

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Abstract

Our aim was to investigate when halfcycle reconstruction (HCR) was feasible in patients who were predicted to have a heart rate over 65 bpm in coronary CT angiography (CTA) using 320-row CT. Seventy-four patients who underwent multiple heart beat scanning were included. The time to reach 230 HU at the ascending aorta during the bolus tracking scan was recorded (T230). HCR image and multicycle reconstruction (MCR) image were reconstructed for each patient. Image quality for each coronary segment was rated on a 3-point scale (3: good, 1: poor). For each patient, we determined that a single beat acquisition was feasible for diagnosis (HCR group) when the number of segments graded score 1 in the HCR image was the same or less than that in the MCR image. Otherwise, we included the patients in the MCR group. HCR group and MCR group included 38 and 36 patients, respectively. Regression analysis showed that body height >1.66 m (odds ratio (OR), 5.74; CI 1.59–25.6; p < 0.007), T230 >16 s (OR 3.11; CI 1.07–9.58; p = 0.04), and heart rate ≤72 bpm (OR 3.18; CI 1.11–9.49; p = 0.03) were related with the HCR group. When all three criteria were fulfilled, the calculated probability that MCR would improve image quality was only 7 %. When the heart rate is ≤72 bpm, single heart beat acquisition is feasible for patients with body height >1.66 m and T230 > 16 s in coronary CTA using 320-row CT.

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Conflict of interest

One author (R.T.) is an employee of Toshiba Medical Systems.

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Authors and Affiliations

  1. Department of Radiology, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

    Nobuo Tomizawa, Kodai Yamamoto, Masaaki Akahane & Kuni Ohtomo

  2. Toshiba Medical Systems Corporation, Tokyo Metropolitan Regional Office, 1-6, Tsukuda 2-Chome, Chuo-ku, Tokyo, 104-0051, Japan

    Rumiko Torigoe

  3. Department of Radiology, Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan

    Shigeru Kiryu

Authors
  1. Nobuo Tomizawa
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  2. Kodai Yamamoto
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  3. Masaaki Akahane
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  4. Rumiko Torigoe
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  5. Shigeru Kiryu
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  6. Kuni Ohtomo
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Correspondence to Nobuo Tomizawa.

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Tomizawa, N., Yamamoto, K., Akahane, M. et al. The feasibility of halfcycle reconstruction in high heart rates in coronary CT angiography using 320-row CT. Int J Cardiovasc Imaging 29, 907–911 (2013). https://doi.org/10.1007/s10554-012-0151-0

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  • DOI: https://doi.org/10.1007/s10554-012-0151-0

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