Ultrasonic Generation by Ferromagnetic Resonance in Evaporated Ni–Fe Alloy Films. I

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 ECGgated 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 tissueweighting 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. H Lu et al J. Radiol. Prot. 35 (2015) 597 H Lu et al J. Radiol. Prot. 35 (2015) 597 H Lu et al J. Radiol. Prot. 35 (2015) 597 H Lu et al J. Radiol. Prot. 35 (2015) 597