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Influence of dose reduction recommendations on changes in chest radiography techniques
H M Warren-Forward1, M J Haddaway, I W McCall
1Department of Radiology, Robert Jones & Agnes Hunt Orthopaedic Hospital, Oswestry, Shropshire, UK.
The British Journal of Radiology
|August 1, 1996
Summary
Following recommendations, chest radiography patient entrance surface dose (ESD) was reduced by 47%. This significant reduction in radiation exposure was achieved by increasing applied potential and using faster film-screen sensitivities.
Area of Science:
- Medical Physics
- Radiological Protection
- Diagnostic Imaging
Background:
- Previous research identified methods to decrease patient entrance surface dose (ESD) in chest radiography.
- Recommendations were issued to optimize radiation exposure in diagnostic imaging procedures.
Purpose of the Study:
- To monitor changes in applied potential and film-screen sensitivity post-recommendations.
- To assess the impact of issued recommendations on patient radiation dose.
- To identify factors influencing the adoption of reduced radiation exposure techniques.
Main Methods:
- Collected exposure factors for 30 patients per X-ray tube where changes occurred.
- Calculated mean ESD for each tube and validated with TLD measurements for 10 units.
- Analyzed changes in applied potential (kVp) and film-screen sensitivity (e.g., 400 speed).
Main Results:
- 89% of units now use >90 kVp; 51% use 400-speed film-screen.
- Mean ESD decreased by 47% (from 0.15 mGy to 0.08 mGy).
- Estimated annual collective dose reduction exceeding 40 man Sv in 30 hospitals.
Conclusions:
- Issued recommendations effectively reduced patient ESD in chest radiography.
- Increased applied potential and faster film-screen sensitivity were key factors.
- Awareness of dose levels, feedback, and inter-departmental contact drove positive changes.