Electrocardiogram-gated Coronary CT Angiography Dose Estimates Using ImPACT

Overview

Journal J Appl Clin Med Phys

Specialties Biophysics
General Medicine

Date 2016 Jul 26

PMID 27455500

Citations 1

Authors

Masanao Kobayashi

Yasuki Asada

Kosuke Matsubara

Shouichi Suzuki

Kichiro Koshida

Yuta Matsunaga

Tomonobu Haba

Ai Kawaguchi

Hiroshi Toyama

Ryouichi Kato

Affiliations

Soon will be listed here.

Abstract

The primary study objective was to assess radiation doses using a modified form of the Imaging Performance Assessment of Computed Tomography (CT) scanner (ImPACT) patient dosimetry for cardiac applications on an Aquilion ONE ViSION Edition scanner, including the Ca score, target computed tomography angiography (CTA), prospective CTA, continuous CTA/cardiac function analysis (CFA), and CTA/CFA modulation. Accordingly, we clarified the CT dose index (CTDI) to determine the relationship between heart rate (HR) and X-ray exposure. As a secondary objective, we compared radiation doses using modified ImPACT, a whole-body dosimetry phantom study, and the k-factor method to verify the validity of the dose results obtained with modified ImPACT. The effective dose determined for the reference person (4.66 mSv at 60 beats per minute (bpm) and 33.43 mSv at 90bpm) were approximately 10% less than those determined for the phantom study (5.28 mSv and 36.68 mSv). The effective doses according to the k-factor (0.014 mSv•mGy-1•cm-1; 2.57 mSv and 17.10 mSv) were significantly lower than those obtained with the other two methods. In the present study, we have shown that ImPACT, when modified for cardiac applications, can assess both absorbed and effective doses. The results of our dose comparison indicate that modified ImPACT dose assessment is a promising and practical method for evaluating coronary CTA.

Citing Articles

Evaluation of radiation dose for inferior vena cava filter placement during pregnancy: A comparison of dosimetry and dose calculation software.

Matsunaga Y, Haba T, Kobayashi M, Suzuki S, Asada Y, Chida K J Appl Clin Med Phys. 2022; 24(2):e13884.

PMID: 36546565 PMC: 9924124. DOI: 10.1002/acm2.13884.

References

Brownell G, ELLETT W, Reddy A . Absorbed fractions for photon dosimetry. J Nucl Med. 1968; :Suppl :29-39. View

. The 2007 Recommendations of the International Commission on Radiological Protection. ICRP publication 103. Ann ICRP. 2007; 37(2-4):1-332. DOI: 10.1016/j.icrp.2007.10.003. View

Halliburton S, Abbara S, Chen M, Gentry R, Mahesh M, Raff G . SCCT guidelines on radiation dose and dose-optimization strategies in cardiovascular CT. J Cardiovasc Comput Tomogr. 2011; 5(4):198-224. PMC: 3391026. DOI: 10.1016/j.jcct.2011.06.001. View

Kobayashi M, Asada Y, Matsubara K, Matsunaga Y, Kawaguchi A, Katada K . Evaluation of organ doses and effective dose according to the ICRP Publication 110 reference male/female phantom and the modified ImPACT CT patient dosimetry. J Appl Clin Med Phys. 2014; 15(5):4823. PMC: 5711082. DOI: 10.1120/jacmp.v15i5.4823. View

Abbara S, Arbab-Zadeh A, Callister T, Desai M, Mamuya W, Thomson L . SCCT guidelines for performance of coronary computed tomographic angiography: a report of the Society of Cardiovascular Computed Tomography Guidelines Committee. J Cardiovasc Comput Tomogr. 2009; 3(3):190-204. DOI: 10.1016/j.jcct.2009.03.004. View

Gosling O, Loader R, Venables P, Rowles N, Morgan-Hughes G, Roobottom C . Cardiac CT: are we underestimating the dose? A radiation dose study utilizing the 2007 ICRP tissue weighting factors and a cardiac specific scan volume. Clin Radiol. 2010; 65(12):1013-7. DOI: 10.1016/j.crad.2010.08.001. View

Einstein A, Elliston C, Arai A, Chen M, Mather R, Pearson G . Radiation dose from single-heartbeat coronary CT angiography performed with a 320-detector row volume scanner. Radiology. 2010; 254(3):698-706. PMC: 2826696. DOI: 10.1148/radiol.09090779. View

Shrimpton P, Wall B, Yoshizumi T, Hurwitz L, Goodman P . Effective dose and dose-length product in CT. Radiology. 2009; 250(2):604-5. DOI: 10.1148/radiol.2502081340. View

Einstein A, Sanz J, Dellegrottaglie S, Milite M, Sirol M, Henzlova M . Radiation dose and cancer risk estimates in 16-slice computed tomography coronary angiography. J Nucl Cardiol. 2008; 15(2):232-40. PMC: 2397551. DOI: 10.1016/j.nuclcard.2007.09.028. View

10.

Mori S, Nishizawa K, Kondo C, Ohno M, Akahane K, Endo M . Effective doses in subjects undergoing computed tomography cardiac imaging with the 256-multislice CT scanner. Eur J Radiol. 2007; 65(3):442-8. DOI: 10.1016/j.ejrad.2007.05.001. View

11.

Raff G, Abidov A, Achenbach S, Berman D, Boxt L, Budoff M . SCCT guidelines for the interpretation and reporting of coronary computed tomographic angiography. J Cardiovasc Comput Tomogr. 2009; 3(2):122-36. DOI: 10.1016/j.jcct.2009.01.001. View

12.

Nishizawa K, Maruyama T, Takayama M, Iwai K, Furuya Y . [Estimation of effective dose from CT examination]. Nihon Igaku Hoshasen Gakkai Zasshi. 1995; 55(11):763-8. View

13.

. 1990 Recommendations of the International Commission on Radiological Protection. Ann ICRP. 1991; 21(1-3):1-201. View

14.

Einstein A, Henzlova M, Rajagopalan S . Estimating risk of cancer associated with radiation exposure from 64-slice computed tomography coronary angiography. JAMA. 2007; 298(3):317-23. DOI: 10.1001/jama.298.3.317. View

15.

Kobayashi M, Asada Y, Matsubara K, Koshida K, Suzuki S, Matsunaga Y . Evaluation of the CT dose index for scans with an ECG using a 320-row multiple-detector CT scanner. Radiat Prot Dosimetry. 2014; 167(4):532-41. DOI: 10.1093/rpd/ncu331. View

16.

Menzel H, Clement C, Deluca P . ICRP Publication 110. Realistic reference phantoms: an ICRP/ICRU joint effort. A report of adult reference computational phantoms. Ann ICRP. 2009; 39(2):1-164. DOI: 10.1016/j.icrp.2009.09.001. View

17.

. Managing patient dose in computed tomography. A report of the International Commission on Radiological Protection. Ann ICRP. 2001; 30(4):7-45. DOI: 10.1016/s0146-6453(01)00049-5. View

18.

Valentin J . Managing patient dose in multi-detector computed tomography(MDCT). ICRP Publication 102. Ann ICRP. 2007; 37(1):1-79, iii. DOI: 10.1016/j.icrp.2007.09.001. View

19.

Hunold P, Vogt F, Schmermund A, Debatin J, Kerkhoff G, Budde T . Radiation exposure during cardiac CT: effective doses at multi-detector row CT and electron-beam CT. Radiology. 2003; 226(1):145-52. DOI: 10.1148/radiol.2261011365. View