Yogesh Thakur, PhD, MCCPM, Thorarin A

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Radiation Dose Survey for Common Computed Tomography Exams: 2013 British Columbia Results Yogesh Thakur, PhD, MCCPM, Thorarin A. Bjarnason, PhD, MCCPM, Patricia Baxter, MSc, Mitch Griffith, RTNM, Kirk Eaton, MPA Canadian Association of Radiologists Journal Volume 67, Issue 1, Pages 88-95 (February 2016) DOI: 10.1016/j.carj.2015.07.002 Copyright © 2016 Terms and Conditions

Figure 1 Average dose-length product (DLP) for adult head exams reported from 39 of 68 sites, which recorded at least 10 patient data sets. Blue indicates sites without iterative reconstruction available. Black indicates sites with iterative reconstruction (may not be enabled by site for specific protocol). BC012 recorded an average patient dose of 2432 mGy-cm during the survey. The protocol for BC012 was immediately optimized with the survey repeated (BC012* - red). The average dose of scanners with iterative reconstruction enabled required 31% less radiation output (grey solid, diagnostic reference level [DRL] = 800) than scanners with FBP (grey short dash, DRL = 1352), and 10% less radiation than scanners with iterative reconstruction available but not used (grey long dash short, DRL = 1138). The average dose at 7 scanners in BC were above the BC DRL for head examinations (BC: grey long dash, DRL = 1305). BC = British Columbia. Canadian Association of Radiologists Journal 2016 67, 88-95DOI: (10.1016/j.carj.2015.07.002) Copyright © 2016 Terms and Conditions

Figure 2 Average dose-length product (DLP) for adult chest exams reported from 35 of 68 sites, which recorded at least 10 patient data sets. Blue indicates sites without iterative reconstruction available. Black indicates sites with iterative reconstruction (may not be enabled by site for specific protocol). The average dose of scanners with iterative reconstruction enabled required 38% less radiation output (grey solid, diagnostic reference level [DRL] = 312) than scanners with filtered backprojection (grey short dash, DRL = 548), and 29% less radiation than scanners with iterative reconstruction available but not used (grey long dash short, DRL = 391). The average dose at 7 scanners in British Columbia (BC) were above the BC DRL for chest examinations (BC: grey long dash, DRL = 529). Canadian Association of Radiologists Journal 2016 67, 88-95DOI: (10.1016/j.carj.2015.07.002) Copyright © 2016 Terms and Conditions

Figure 3 Average dose-length product (DLP) for adult abdomen/pelvis exams reported from 36 of 68 sites, which recorded at least 10 patient data sets. Blue indicates sites without iterative reconstruction available. Black indicates sites with iterative reconstruction (may not be enabled by site for specific protocol). The average dose of scanners with iterative reconstruction enabled required 22% less radiation output (grey solid, diagnostic reference level [DRL] = 687) than scanners with filtered backprojection (grey short dash, DRL = 882), and 4% less radiation than scanners with iterative reconstruction available but not used (grey long dash short, DRL = 715). The average dose for 4 scanners in British Columbia (BC) were above the BC DRL for abdomen/pelvis examinations (BC: grey long dash, DRL = 819). Canadian Association of Radiologists Journal 2016 67, 88-95DOI: (10.1016/j.carj.2015.07.002) Copyright © 2016 Terms and Conditions

Figure 4 Dose-length product (DLP) for adult abdomen exams reported from 26 of 68 sites, which recorded at least 10 patient data sets. Blue indicates sites without iterative reconstruction available. Black indicates sites with iterative reconstruction (may not be enabled by site for specific protocol). The average dose of scanners with iterative reconstruction enabled required 8% less radiation output (grey solid, DLP = 1181) than scanners with filtered backprojection (grey short dash, DLP = 1289), and 38% more radiation than scanners with iterative reconstruction available but not used (grey long dash short, DLP = 857). The average dose at 1 scanners in British Columbia (BC) were above the BC diagnostic reference level [DRL] for trunk examinations (BC: grey long dash, DLP = 1225). Canadian Association of Radiologists Journal 2016 67, 88-95DOI: (10.1016/j.carj.2015.07.002) Copyright © 2016 Terms and Conditions