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Quality assurance of asymmetric jaw alignment using 2D diode array.

Sun Mo Kim1, Renata Chmielewski, Ahmar Abbas

  • 1Department of Medical Physics, Stronach Regional Cancer Centre, Southlake Regional Health Centre, Newmarket, Ontario L3Y 2P9, Canada and Radiation Medicine Program, Princess Margaret Hospital∕University Health Network, Toronto, Ontario M5G 2M9, Canada.

Medical Physics
|December 11, 2013
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Summary

A new 2D diode array method precisely measures junction gap and dose for asymmetric jaw alignment quality assurance. This technique offers high accuracy and reproducibility, crucial for radiation therapy safety.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance

Background:

  • Accurate quality assurance of asymmetric jaw alignment is critical in radiation therapy.
  • Traditional methods for measuring junction gap and dose may lack precision or spatial resolution.

Purpose of the Study:

  • To propose and validate a novel method using a 2D diode array for high-precision measurement of junction gap and dose.
  • To assess the routine quality assurance applicability for asymmetric jaw alignment.

Main Methods:

  • Determined central axis (CAX) using a 15 × 15 cm² photon field at four collimator angles.
  • Utilized two abutting fields (15 cm × 7.5 cm) to irradiate a 2D diode array (MapCHECK2) with 100 MU at 6 MV.
  • Rotated the collimator 15° to optimize diode coverage for junction gap measurement.
  • Compared results with electronic portal imaging device (EPID) and radiochromic film.

Main Results:

  • MapCHECK2 measurements showed excellent agreement with EPID and film for junction gap (differences: -0.01 to 0 cm) and dose (differences: -1.34% to 0.6%).
  • Demonstrated high reproducibility for junction gap measurements (no variation) and minimal variation for dose measurements (0.21%-0.35%).
  • The method exhibited ideal sensitivity for junction gap (1 cm/cm) and high sensitivity to dose changes with decreasing gap (201.7%/cm).

Conclusions:

  • The proposed 2D diode array method is suitable for comprehensive quality assurance of asymmetric jaw alignment.
  • The technique provides precise and reproducible measurements essential for patient safety in radiation therapy.