Reducing the radiation exposure of physicians during computed tomography-guided biopsy using an adjustable X-ray beam...

Area of Science:

• Medical Physics
• Radiology
• Radiation Protection

Background:

• Physicians performing intermittent computed tomography (CT) fluoroscopy face occupational radiation exposure.
• Minimizing radiation dose is crucial for the safety of healthcare professionals during interventional procedures.

Purpose of the Study:

• To evaluate the impact of the half-scan technique on physician radiation exposure during CT fluoroscopy.
• To determine optimal angular ranges for the half-scan to reduce radiation dose.
• To assess the effectiveness of lead shielding in conjunction with the half-scan technique.

Main Methods:

• Simulated intermittent CT fluoroscopy on a chest phantom using varying angular ranges (0°, 90°, 180°, 270°) for the half-scan.
• Measured ambient dose equivalent at physician-relevant heights (eye lens, chest, pelvis) using an optically stimulated luminescence dosemeter.
• Evaluated the effect of a lead shielding drape on radiation exposure.

Main Results:

• The minimum ambient dose equivalent was observed at 180° for the head and 90° for the chest and abdomen.
• Similar dose reduction trends were noted for the physician's upper extremities.
• A lead shielding drape reduced radiation exposure by 72% (head), 73% (chest), and 33% (pelvis).

Conclusions:

• The half-scan technique, with optimized angular settings, can effectively reduce physician radiation exposure in CT fluoroscopy.
• Combining the half-scan technique with lead shielding provides substantial radiation dose reduction.
• Implementing lead shielding and half-scan strategies is important for radiation safety in CT-guided interventions, particularly lung procedures.