Total effective radiation dose from spiral CT and conventional radiography of the pelvis with regard to fracture classification.
OBJECTIVE
In most departments CT has replaced special radiographic projections with regard to classification of pelvic fractures. This change of procedure calls for analysis in terms of dosimetry.


METHODS
The total effective radiation doses given with spiral CT and conventional 5 projection radiography were determined according to ICRP 60 by measuring organ doses with an anthropomorphic Rando Alderson phantom packed with thermoluminescence dosimeters. For comparison, easily obtainable calculated effective doses were also determined, based on the CT dose index (CTDI), measured free-in-air and as entrance surface dose using organ conversion factors according to NRPB-R250 and NRPB-R262.


RESULTS
The total effective radiation dose was lower in spiral CT than in conventional 5 projection radiography, 4.4 and 5.0 mSv, respectively. In spiral CT the calculated effective dose was 11% lower and in conventional radiography 68% higher than the dose obtained by actual measurement using the Alderson phantom.


CONCLUSIONS
As CT gives important diagnostic information with regard to classification of pelvic fractures, and without a greater radiation risk than impacted by 5 projection conventional radiography, we recommend the performance of spiral CT instead of special projections.
Department of Diagnostic Radiology, Municipal Hospital, University Hospital of Aarhus, Denmark.
A G
AG
Jurik
L C
LC
Jensen
J
J
Hansen
D000077:Acetabulum / Q000293:injuries*; D050723:Fractures, Bone / Q000000981:diagnostic imaging*; D006801:Humans; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011835:Radiation Protection; D011859:Radiography / Q000295:instrumentation; D013819:Thermoluminescent Dosimetry; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*