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Related Experiment Video

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Irradiator Commissioning and Dosimetry for Assessment of LQ &#945; and &#946; Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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Leaf-individual calibration for a double stack multileaf collimator in photon radiotherapy.

Carolin Rippke1,2,3, C Katharina Renkamp1,2, Charbel Attieh4

  • 1Department of Radiation Oncology, Heidelberg University Hospital, Heidelberg, Baden-Württemberg, Germany.

Physics and Imaging in Radiation Oncology
|August 28, 2023
PubMed
Summary

A new radiation-based leaf-individual calibration (LIMCA) method enhances accuracy for double stack multileaf collimators (MLCs) in online adaptive radiotherapy. This method ensures precise delivery, crucial for patient safety and effective cancer treatment.

Keywords:
Adaptive radiotherapyImage guided radiotherapyMR-LinacMR-guided radiotherapyMultileaf collimatorPhoton radiotherapyQuality assuranceQuality controlSmall field dosimetry

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Technology

Background:

  • Accurate linear accelerator delivery is critical for online adaptive stereotactic body radiotherapy.
  • Double stack multileaf collimators (MLCs) present unique calibration challenges.
  • Existing calibration methods may not fully address the complexities of double stack MLCs.

Purpose of the Study:

  • To establish a novel radiation-based leaf-individual calibration (LIMCA) method specifically for double stack MLCs.
  • To evaluate the accuracy and repeatability of the LIMCA method.
  • To assess the impact of MLC positioning errors on treatment accuracy.

Main Methods:

  • MLC leaf positions were assessed from four cardinal angles using radiochromic film.
  • Test patterns were used to evaluate positions across the radiation field for each single stack.
  • The effect of MLC positioning errors was quantified using an output factor curve and a clinical patient plan.

Main Results:

  • The LIMCA method optimized all positions in the calibration file, achieving mean accuracies of 0.2 ± 0.1 mm (X1) and 0.2 ± 0.2 mm (X2).
  • Leaf position evaluation accuracy was 0.2 mm (95% confidence level), with calibration stability over four months.
  • Minor MLC errors (1.2 mm field size reduction) caused significant dose errors (-5.8%) in small fields, highlighting the need for precise single stack accuracy.

Conclusions:

  • LIMCA is an effective new calibration method for double stack MLCs.
  • The method enhances treatment accuracy by accounting for four angles and all moving leaves.
  • Accurate MLC calibration is essential for precise dose delivery in advanced radiotherapy techniques.