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01.02.2012 | Original Article

Effect of bismuth breast shielding on radiation dose and image quality in coronary CT angiography

verfasst von: Andrew J. Einstein, MD, PhD, Carl D. Elliston, MA, Daniel W. Groves, MD, Bin Cheng, PhD, Steven D. Wolff, MD, PhD, Gregory D. N. Pearson, MD, PhD, M. Robert Peters, MD, Lynne L. Johnson, MD, Sabahat Bokhari, MD, Gary W. Johnson, AAS, Ketan Bhatia, CNMT, Theodore Pozniakoff, RT, CNMT, David J. Brenner, PhD, DSc

Erschienen in: Journal of Nuclear Cardiology | Ausgabe 1/2012

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Abstract

Background

Coronary computed tomographic angiography (CCTA) is associated with high radiation dose to the female breasts. Bismuth breast shielding offers the potential to significantly reduce dose to the breasts and nearby organs, but the magnitude of this reduction and its impact on image quality and radiation dose have not been evaluated.

Methods

Radiation doses from CCTA to critical organs were determined using metal-oxide-semiconductor field-effect transistors positioned in a customized anthropomorphic whole-body dosimetry verification phantom. Image noise and signal were measured in regions of interest (ROIs) including the coronary arteries.

Results

With bismuth shielding, breast radiation dose was reduced 46%-57% depending on breast size and scanning technique, with more moderate dose reduction to the heart, lungs, and esophagus. However, shielding significantly decreased image signal (by 14.6 HU) and contrast (by 28.4 HU), modestly but significantly increased image noise in ROIs in locations of coronary arteries, and decreased contrast-to-noise ratio by 20.9%.

Conclusions

While bismuth breast shielding can significantly decrease radiation dose to critical organs, it is associated with an increase in image noise, decrease in contrast-to-noise, and changes tissue attenuation characteristics in the location of the coronary arteries.

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Titel: Effect of bismuth breast shielding on radiation dose and image quality in coronary CT angiography
verfasst von: Andrew J. Einstein, MD, PhD
Carl D. Elliston, MA
Daniel W. Groves, MD
Bin Cheng, PhD
Steven D. Wolff, MD, PhD
Gregory D. N. Pearson, MD, PhD
M. Robert Peters, MD
Lynne L. Johnson, MD
Sabahat Bokhari, MD
Gary W. Johnson, AAS
Ketan Bhatia, CNMT
Theodore Pozniakoff, RT, CNMT
David J. Brenner, PhD, DSc
Publikationsdatum: 01.02.2012
Verlag: Springer-Verlag
Erschienen in: Journal of Nuclear Cardiology / Ausgabe 1/2012
Print ISSN: 1071-3581
Elektronische ISSN: 1532-6551
DOI: https://doi.org/10.1007/s12350-011-9473-x

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Effect of bismuth breast shielding on radiation dose and image quality in coronary CT angiography