title: Organ and effective dose evaluation in coronary angiography by using a 320 MDCT based on in-phantom dose measurements with TLDs.
abstract: The purpose of this study is to estimate the organ and effective dose (E) from computed tomography coronary angiography (CTCA) on a 320-MDCT scanner. Radiation dose was estimated for the prospectively ECG-gated CTCA in a male phantom. A total of 451 chips of thermoluminescent dosimeter were implanted in the phantom for measuring the organ doses. The effective doses were calculated using measured organ doses and the tissue-weighting factors. The dose length product (DLP) values were recorded and used to develop the conversion coefficient k = 0.017 mSv•(mGy•cm)(-1) (E/DLP). In a 3-beat acquisition, the organ doses ranged from 0.24 to 71.55 mGy, and the doses in breast, bone surface, oesophagus, and lung were higher than 20 mGy. The effective doses in 2-beat and 3-beat acquisition were estimated to be 14.3 and 24.3 mSv. More beats of acquisition led to higher radiation dose. The reported k values for chest CT scan can be used to roughly estimate the E value from CTCA for 320 MDCT.
authors.affiliation: Department of Radiation Protection, Institute of Radiation Medicine, Fudan University, Shanghai 200032, People's Republic of China. Department of Medical Equipment, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai 201204, People's Republic of China.
authors.forename: Heqing
authors.initials: H
authors.lastname: Lu
authors.forename: Weihai
authors.initials: W
authors.lastname: Zhuo
authors.forename: Bing
authors.initials: B
authors.lastname: Xu
authors.forename: Minjie
authors.initials: M
authors.lastname: Wang
mesh_terms: D001822:Body Burden; D055424:Cardiac-Gated Imaging Techniques; D017023:Coronary Angiography; D006801:Humans; D008297:Male; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011835:Radiation Protection; D013819:Thermoluminescent Dosimetry; D014057:Tomography, X-Ray Computed