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Use of 100 kV versus 120 kV in cardiac dual source computed tomography: effect on radiation dose and image quality

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Abstract

To evaluate the effective radiation dose and image quality resulting from use of 100 vs. 120 kV among patients referred for cardiac dual source CT exam (DSCT). Prospective data was collected on 294 consecutive patients referred for DSCT. For each scan, a physician specializing in cardiac CT chose all parameters including tube current and voltage, axial versus helical acquisition, and use of tube current modulation. Lower tube voltage was selected for thinner patients or when lower radiation was desired for younger patients, particularly females. For each study, image quality (IQ) was rated on a subjective IQ score and contrast (CNR) and signal-to-noise (SNR) ratios were calculated. Tube voltage of 100 kV was used for 77 (26%) exams while 120 kV was used for 217 (74%) exams. Use of 100 kV was more common in thinner patients (weight 166lbs vs. 199lbs, P < .001). The effective radiation dose for the 100 and 120 kV scans was 8.5 and 15.4 mSv respectively. Among scans utilizing 100 and 120 kV, there was no difference in exam indication, use of beta blockers, heart rate, scan length and use of radiation saving techniques such as prospective ECG triggering and tube current modulation. The IQ score was significantly higher for 100 kV scans. While 100 kV scans were found to have higher image noise then those utilizing 120 kV, the contrast-to-noise and signal-to-noise were significantly higher (SNR: 9.4 vs. 8.3, P = .02; CNR: 6.9 vs. 6.0, P = .02). In selected non-obese patients, use of low kV results in a substantial reduction of radiation dose and may result in improved image quality. These results suggest that low kV should be used more frequently in non-obese patients.

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Acknowledgments

Drs. Blankstein and Rogers received support from NIH grant 1T32 HL076136-02.

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Authors and Affiliations

  1. Cardiac MR PET CT Program, Department of Radiology and Division of Cardiology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA

    Ron Blankstein, Rodrigo Pale, Meagan K. Murphy, Amar B. Shah, Hiram G. Bezerra, Ammar Sarwar, Ian S. Rogers, Udo Hoffmann, Suhny Abbara, Ricardo C. Cury & Thomas J. Brady

  2. Non-invasive Cardiovascular Imaging Program, Department of Medicine (Cardiovascular Division) and Radiology, Brigham and Women’s Hospital, 75 Francis Street, Boston, MA, 02115, USA

    Ron Blankstein

  3. Cardiovascular Section, Imaging Institute, Cleveland Clinic, Cleveland, OH, 44195, USA

    Michael A. Bolen

  4. Baptist Cardiac and Vascular Institute, 8900 N. Kendall Drive, Miami, FL, 33176, USA

    Ricardo C. Cury

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  1. Ron Blankstein
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  2. Michael A. Bolen
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  3. Rodrigo Pale
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  4. Meagan K. Murphy
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  8. Ian S. Rogers
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  12. Thomas J. Brady
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Correspondence to Ron Blankstein.

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Blankstein, R., Bolen, M.A., Pale, R. et al. Use of 100 kV versus 120 kV in cardiac dual source computed tomography: effect on radiation dose and image quality. Int J Cardiovasc Imaging 27, 579–586 (2011). https://doi.org/10.1007/s10554-010-9683-3

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  • DOI: https://doi.org/10.1007/s10554-010-9683-3

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