Title: Radiation Dose from Diagnostic Computed Tomography (CT) in
Researcher names: David A. Leswick MD FRCPC, Derek A. Fladeland MD FRCPC,
Nida S. Syed
Type of presentation: Research Study
Objective: To estimate the effective dose from diagnostic CT scans in Saskatchewan,
Canada and to compare the patient dose to accepted standards.
Methods: Eleven hospitals across the province will be invited to provide information on
CT scan technique and estimated patient dose. Collected data will include the patient
age, scan type and selected technique parameters including the Dose Linear Product
(DLP) and the Computed Tomography Dose Index (CTDI) for a two week period. The
patient height and weight will also be collected in the Royal University Hospital. The
average patient dose and the range for each specific exam in each hospital will be
compared among the sites. Those doses will also be compared to similar studies carried
out in British Columbia, the United Kingdom and Germany.
Discussion: This is a work in progress. The results of this study will allow us to assess if
standard methods of minimizing patient doses are being utilized and will help to promote
the use of minimum radiation dose to patients undergoing diagnostic CT scans at the
participating hospitals. This study will also strive to identify specific patient
characteristics that may subject them to higher CT dose when hospitals routinely use
automatic tube current modulation as a method of minimizing patient dose. It is possible
that scanning parameters are variable between the hospitals and that the dose reducing
parameters are not being utilized. This study wishes to find evidence of this statement
and to aid in the future reduction of diagnostic radiation dose by computed tomography
scans in Saskatchewan.