. Author manuscript; available in PMC: 2022 Sep 1.

Published in final edited form as: J Cardiovasc Comput Tomogr. 2021 Jan 27;15(5):441–448. doi: 10.1016/j.jcct.2021.01.003

Table 1.

Cardiothoracic CT Conversion Factors (k factor) for DLP to mSv Calculation.

Age group	Age interval (years)	Historic conversion factors (ICRP 60)¹¹ (mSv*mGy⁻¹cm⁻¹)	Conversion factors (ICRP 103)¹² (mSv*mGy⁻¹cm⁻¹)
0	≤0.5	0.078	0.085
1	>0.5–2.5	0.052	0.079
5	>2.5–7.5	0.036	0.065
10	>7.5–12.5	0.026	0.037
15	>12.5	0.014	0.026

CT, computed tomography; DLP, dose-length product; ED, effective dose; ICRP, International Commission on Radiological Protection (ICRP). ICRP 60 (1990),¹¹ ICRP 103 (2007).¹² Conversion factors are for DLP from a 32 cm phantom.