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Operator eye doses during computed tomography fluoroscopic lung biopsy.

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Lead glasses significantly reduce eye radiation exposure during CT fluoroscopy lung biopsies. Increased kVp, mA, and head rotation toward the gantry increase eye radiation dose.

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Area of Science:

  • Radiology
  • Medical Physics
  • Radiation Protection

Background:

  • CT fluoroscopy is crucial for lung biopsies.
  • Ocular radiation exposure is a concern for interventional radiologists.
  • Understanding factors influencing eye dose is vital for radiation safety.

Purpose of the Study:

  • To evaluate peak entrance surface air kerma (ESAK) to the eyes during CT fluoroscopy lung biopsy.
  • To assess the impact of lead glasses, exposure parameters (kVp, mA), head rotation, and height on peak ESAK.

Main Methods:

  • Utilized two phantoms (patient and radiologist) with a 16-slice CT scanner.
  • Measured peak ESAK to the radiologist's eye using a dosimeter.
  • Varied lead glasses, kVp (120/135), mA (10/20/30), and phantom rotation angles.

Main Results:

  • Peak ESAK was significantly lower with lead glasses (p ≤ 0.001).
  • ESAK increased with head rotation towards the gantry (2.42 μGy at 120° to 10.54 μGy at 30°, p = 0.001).
  • Higher kVp and mA settings substantially increased peak ESAK (p ≤ 0.005).

Conclusions:

  • Lead glasses are effective in reducing ocular radiation dose during CT fluoroscopy.
  • Radiologist head rotation, kVp, and mA are critical factors influencing eye radiation exposure.
  • Optimizing these parameters is essential for minimizing radiation risk to the eyes.