Radiographic workload and use factors for orthopedic facilities

Area of Science:

• Medical Physics
• Radiological Sciences
• Health Physics

Background:

• Orthopedic radiography facilities require specific radiation shielding to protect staff and patients.
• Current shielding calculations rely on assumptions from the National Council on Radiation Protection (NCRP) regarding workload, use factors, and operating potential.
• The adequacy and potential overestimation of these shielding recommendations in dedicated orthopedic settings warrant investigation.

Purpose of the Study:

• To evaluate the accuracy of current NCRP recommended assumptions for protective barrier design in orthopedic radiography.
• To assess actual radiation workload, use factors, and operating potentials in clinical orthopedic radiography settings.
• To determine if existing shielding is potentially excessive based on empirical measurements.

Main Methods:

• Conducted observations of technique factors at nine orthopedic radiography installations.
• Performed monthly area radiation measurements using thermoluminescent dosimeters at three facilities.
• Analyzed data on workload (mA min/wk), use factors (e.g., chest wall, vertical barriers), and operating potential (kVp).

Main Results:

• Observed average workload of 224 mA min/wk, with a maximum weekly average of 670 mA min/wk.
• Measured average use factor for the chest wall at 5%, and for other vertical barriers below 1%.
• Average operating potential was 75 kVp; radiation measurements indicated some walls and the control booth may function as secondary barriers.

Conclusions:

• Empirical data suggests that current NCRP recommended assumptions for protective barrier computations in orthopedic radiography may result in overshielding.
• The findings indicate a potential for optimizing shielding requirements, leading to more efficient radiation protection strategies.
• Further research could refine shielding guidelines based on specific clinical practices in orthopedic imaging.