Radiation Dose Reduction and Coronary Assessability of Prospective Electrocardiogram-Gated Computed Tomography Coronary AngiographyComparison With Retrospective Electrocardiogram-Gated Helical Scan
Takao Maruyama, MD, PhD*,*,
Masanori Takada, MD*,
Toshiaki Hasuike, MD*,
Atsushi Yoshikawa, MD*,
Eiji Namimatsu, RT and
Tohru Yoshizumi, RT*,
Department of Cardiology, Kawasaki Hospital, Kobe, Japan
Department of Radiology, Kawasaki Hospital, Kobe, Japan
Department of Internal Medicine and Molecular Science, Graduate School of Medicine, Osaka University, Osaka, Japan
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Figure 3 Reconstructed Coronary Images of Helical Scan and Prospective Gating
(A) Curved multiplanar reformatted and cross-sectional images by helical scan. Left anterior descending artery of 58-year-old man who was suspected of exhibiting effort angina is shown, and a partially calcified plaque was observed (arrow). Estimated effective dose: 22.8 mSv. (B) Selective angiography of the same patient. Moderate coronary stenosis is observed in the same position as in panel A as detected by multidetector (row) computed tomography coronary angiography. A myocardial perfusion test revealed no ischemia (not shown); therefore, this patient was treated medically. (C) Multidetector (row) computed tomography coronary angiography follow-up by prospective gating 6 months after angiography in the same patient. Similar image quality was obtained. Estimated effective dose: 4.0 mSv.
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