Radiation Dose from Diagnostic Computed Tomography in Saskatchewan

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Presentation transcript:

Radiation Dose from Diagnostic Computed Tomography in Saskatchewan David A. Leswick, MD, FRCPC, Nida S. Syed, MD, Chance S. Dumaine, Hyun J. Lim, PhD, Derek A. Fladeland, MD, FRCPC Canadian Association of Radiologists Journal Volume 60, Issue 2, Pages 71-78 (April 2009) DOI: 10.1016/j.carj.2009.02.035 Copyright © 2009 Canadian Association of Radiologists Terms and Conditions

Figure 1 The radiation dose from head CT scans in Saskatchewan. The x-axis indicates the scanners, which are shown by number to retain anonymity. Scanners 1 and 2 are SDR scanners, with scanners 3 through 12 representing the MDR scanners, with no relationship between scanner number and CT scanner design. The numbers in parentheses indicate the number of total scans and the number of single-phase scans, respectively. Single-phase data are not presented for scanner 12 because information regarding the number of phases was not provided by that particular site. Note the difference in the y-axis scale between Figure 1 and Figures 2 and 3. Canadian Association of Radiologists Journal 2009 60, 71-78DOI: (10.1016/j.carj.2009.02.035) Copyright © 2009 Canadian Association of Radiologists Terms and Conditions

Figure 2 The radiation dose from chest CT scans in Saskatchewan. The x-axis indicates the scanners, which are shown by number to retain anonymity. Scanners 1 and 2 are SDR scanners, with scanners 3 through 12 representing the MDR scanners, with no relationship between scanner number and CT scanner design. The numbers in parentheses indicate the number of total scans and the number of single-phase scans, respectively. Single-phase data are not presented for scanner 12 because information regarding the number of phases was not provided by that particular site. Canadian Association of Radiologists Journal 2009 60, 71-78DOI: (10.1016/j.carj.2009.02.035) Copyright © 2009 Canadian Association of Radiologists Terms and Conditions

Figure 3 The radiation dose from combined abdominal-pelvic CT scans in Saskatchewan. This chart does not include CT scans performed solely on the abdomen or pelvis. Scanners 1 and 2 are SDR scanners, with scanners 3 through 12 representing the MDR scanners, with no relationship between scanner number and CT scanner design. The x-axis indicates the scanners, which are shown by number to retain anonymity. The numbers in parentheses indicate the number of total scans and the number of single-phase scans, respectively. Single-phase data are not presented for scanner 12 because information regarding the number of phases was not provided by that particular site. Canadian Association of Radiologists Journal 2009 60, 71-78DOI: (10.1016/j.carj.2009.02.035) Copyright © 2009 Canadian Association of Radiologists Terms and Conditions

Figure 4 Provincial-wide effective dose histogram for CT scans of the (A) head, (B) chest, and (C) abdomen-pelvis. Note that although the range for head, chest, and abdomen pelvis scans is large, much of this apparent range is made up by outliers. Specifically, this can be seen by the 8 head scans greater than 7.5 mSv (3 SDs above the mean), 5 chest scans greater than 38 mSv (3 SDs greater than the mean), and 9 abdomen-pelvis scans greater than 45.5 mSv (3 SDs greater than the mean). Canadian Association of Radiologists Journal 2009 60, 71-78DOI: (10.1016/j.carj.2009.02.035) Copyright © 2009 Canadian Association of Radiologists Terms and Conditions