CTDIvol: a suitable normalization for CT dose conversion coefficients at different tube voltages?

Helmut Schlattl; Maria Zankl; Christoph Hoeschen

doi:10.1117/12.910905

3 March 2012 CTDI_vol: a suitable normalization for CT dose conversion coefficients at different tube voltages?

Helmut Schlattl, Maria Zankl, Christoph Hoeschen

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 83131P (2012) https://doi.org/10.1117/12.910905
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

Abstract

Reliable estimates for patient doses for CT examinations are desirable for the patients themselves as well as for new epidemiological studies. It has been shown that dose conversion coefficients normalized to CTDI_vol provide rather scanner independent quantities. In this work, it is demonstrated that this normalization provides also tube voltage independent values by simulating axial CT scans of a seven-year old infant and an adult. The differences in the effective dose conversion coefficients per CTDIvol between 80 and 120 kV is for most body heights below 5%. Only at the height of the testes and the thyroid the difference can be as large as 15%. This results in differences of the effective dose conversion coefficient per CTDIvol between 80 and 120 kV of less than 6-7% for typical CT examinations.

Citation Download Citation

Helmut Schlattl, Maria Zankl, and Christoph Hoeschen "CTDI_vol: a suitable normalization for CT dose conversion coefficients at different tube voltages?", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83131P (3 March 2012); https://doi.org/10.1117/12.910905

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