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The Scientific World Journal
Volume 2013 (2013), Article ID 731590, 5 pages
Research Article

Influence of Image Acquisition on Radiation Dose and Image Quality: Full versus Narrow Phase Window Acquisition Using 320 MDCT

1Department of Radiology, Emory University Hospital Midtown, Atlanta, GA, USA
2Department of Radiology, Beth Israel Deaconess Medical Center, Harvard University, Boston, MA, USA
3Department of Cardiology, Yale University School of Medicine, New Haven, CT, USA
4Department of Cardiology, Los Angeles Biomedical Research Institute, Torrance, CA, USA
5Department of Radiology, Brigham and Women’s Hospital Harvard Medical School, Boston, MA, USA

Received 5 August 2013; Accepted 7 October 2013

Academic Editors: F. D. Knollmann and H.-M. Liu

Copyright © 2013 Faisal Khosa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose. To compare radiation dose and image quality using predefined narrow phase window versus complete phase window with dose modulation during R-R using 320-row MDCTA. Methods. 114 patients underwent coronary CTA study using 320-row MDCT scanner. 87 patients with mean age (61 + 13 years), mean BMI (29 + 6), and mean heart rate (HR) (58 + 7 bpm) were imaged at predefined 66–80% R-R interval and then reconstructed at 75% while 27 patients with mean age (63 + 16 years), mean BMI (28 + 5), and mean HR (57 + 7 bpm) were scanned throughout the complete R-R interval with tube current modulation. The effective dose (ED) was calculated from dose length product (DLP) and conversion k (0.014 mSv/mGy/cm). Image quality was assessed using a three-point ordinal scale (1 = excellent, 2 = good, and 3 = nondiagnostic). Results. Both groups were statistically similar to each other with reference of HR (), BMI (), and tube current mAs (). The median radiation dose was significantly higher in those scanned with complete R-R phase window versus narrow phase window (). Independently of patient and scan parameters, increased phase window was associated with higher radiation dose (). Image quality was better among those scanned with narrow phase window versus complete phase window (). Conclusion. Our study supports that good HR control and predefined narrow window acquisition result in lower radiation dose without compromising diagnostic image quality for coronary disease evaluation.