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Radiation Exposure to the Sacroiliac Joint From Low-Dose CT Compared With Radiography.

Baljot S Chahal1, Alexander L C Kwan1, Sukhvinder S Dhillon1

  • 11 Department of Radiology and Diagnostic Imaging, Faculty of Medicine and Dentistry, University of Alberta, 2A2.41 WC MacKenzie Health Sci Centre. 8440-112 St, Edmonton, AB T6G 2B7, Canada.

AJR. American Journal of Roentgenology
|September 13, 2018
PubMed
Summary

Low-dose CT delivers a safe effective radiation dose to the sacroiliac joint (SIJ), under 1 mSv. This study recommends low-dose CT over radiography for SIJ evaluation due to its diagnostic quality and reliability.

Keywords:
low-dose CTradiationradiographysacroiliac jointspondyloarthropathy

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Dosimetry

Background:

  • Radiography for sacroiliac joint (SIJ) evaluation has limitations in reliability and sensitivity.
  • Assessing radiation dose from diagnostic imaging is crucial for patient safety.

Purpose of the Study:

  • To estimate the effective radiation dose to the SIJ from low-dose computed tomography (LD CT) compared to radiography.
  • To evaluate the diagnostic quality of LD CT for the SIJ.
  • To develop a clinical protocol for LD CT of the SIJ.

Main Methods:

  • Analyzed data from 36 patients undergoing LD CT for suspected renal colic.
  • Calculated effective dose estimates for the SIJ and an extended region.
  • Matched LD CT scans with anteroposterior pelvic and SIJ view radiographs.
  • Estimated radiation dose using International Commission on Radiologic Protection Publication 60 guidelines.

Main Results:

  • Maximum effective dose to the SIJ from LD CT was consistently below 1 mSv (mean 0.42 ± 0.18 mSv).
  • Mean dose from SIJ radiographs was 0.15 ± 0.10 mSv, and from pelvic radiographs was 0.09 ± 0.06 mSv.
  • All LD CT studies provided diagnostic quality for SIJ assessment.

Conclusions:

  • LD CT of the SIJ can be performed with an effective radiation dose below 1 mSv.
  • LD CT offers superior diagnostic quality and reliability compared to radiography for SIJ evaluation.
  • Recommend LD CT as a replacement for radiography in dedicated SIJ assessments.