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Related Experiment Video

Updated: Apr 24, 2026

Characterization of Recombination Effects in a Liquid Ionization Chamber Used for the Dosimetry of a Radiosurgical Accelerator
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Technical note: a method for improving the calibration reproducibility of an ionization chamber detector array.

Simon Goodall1, Steve Morgan1

  • 1Brighton and Sussex University Hospitals NHS Trust, Eastern Road, Brighton BN2 5BE, United Kingdom.

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|September 5, 2014
PubMed
Summary

This study enhances detector array calibration by adding off-axis exposures, significantly improving the reproducibility of calibration factors for more reliable measurements.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Detector Technology

Background:

  • Wide field calibration methods are crucial for accurate detector array performance.
  • Improving the reproducibility of calibration procedures is essential for consistent clinical applications.

Purpose of the Study:

  • To enhance a wide field calibration method for commercial detector arrays.
  • To improve the reproducibility of the detector array calibration procedure.

Main Methods:

  • Implemented an extended calibration procedure involving off-axis exposures.
  • Acquired additional exposures with detector array shifts along transverse, axial, and diagonal axes.
  • Calculated a linear off-axis correction gradient applied to calibration factors.

Main Results:

  • Reduced mean coefficient of variation from 4.17% to 0.48% across five repeat calibrations.
  • Decreased maximum percentage error in calibration factors from 6.46% to 0.77%.

Conclusions:

  • The enhanced calibration method significantly increases the reproducibility of ionization chamber array calibration factors.
  • Capturing a baseline and two off-axis readings per axis improves calibration accuracy.