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Development of open access tool for automatic use factor calculation using DICOM-RT patient data.

Dong Hyeok Choi1,2,3, Dong Wook Kim1,2,3, So Hyun Park4

  • 1Department of Medicine, Yonsei University College of Medicine, Seoul, Korea.

Physical and Engineering Sciences in Medicine
|July 20, 2023
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Summary

This study recalculated linear accelerator (LINAC) use factors using DICOM-RT data, finding higher values than NCRP 151 recommendations due to modern treatment trends. Institutions should recalculate use factors with patient data for accurate radiation shielding.

Keywords:
DICOM-RTLINACMonitor unitNCRP 151Shielding evaluationUse factor

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiological Shielding

Background:

  • The use factor is crucial for radiation shielding calculations in linear accelerator (LINAC) facilities.
  • NCRP 151 provides established methodologies for determining use factors.
  • Evolving radiation therapy techniques may impact the accuracy of existing use factor calculations.

Purpose of the Study:

  • To recalculate the use factor for LINACs considering modern treatment modalities and trends.
  • To compare recalculated use factors with values from the NCRP 151 report.
  • To assess the influence of treatment techniques and sites on the use factor.

Main Methods:

  • Developed an in-house program utilizing Digital Imaging and Communications in Medicine radiation therapy (DICOM-RT) data.
  • Calculated use factors for four LINACs across three hospitals.
  • Analyzed data based on treatment techniques (3D-CRT, IMRT/VMAT) and treatment sites.

Main Results:

  • Recalculated use factors at 45° and 90° were 14.8% and 13.5% higher, respectively, than NCRP 151 values.
  • In rooms with high 3D-CRT ratios, use factor deviations reached up to 14.6% compared to NCRP 151.
  • Significant differences in use factors were observed for specific sites like breast and spine.

Conclusions:

  • Current use factors may not accurately reflect modern radiation therapy practices.
  • Patient-specific data and institutional recalculations are recommended for precise radiation shielding.
  • Advancements in LINAC technology and treatment planning necessitate updated shielding parameter assessments.