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Portal dosimetry scripting application programming interface (PDSAPI) for Winston-Lutz test employing ceramic balls.

Yao Hao1, Matthew C Schmidt1, Yu Wu1

  • 1Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO, USA.

Journal of Applied Clinical Medical Physics
|October 24, 2020
PubMed
Summary

A new Portal Dosimetry Scripting Application Programming Interface (PDSAPI) streamlines the Winston-Lutz (WL) test for stereotactic radiosurgery (SRS) and stereotactic body radiation therapy (SBRT). This method offers comparable accuracy to commercial software, potentially enabling daily testing.

Keywords:
BBDoseLabPDSAPIRITWinston-Lutzdisplacementshift

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiosurgery Technology

Background:

  • Stereotactic radiosurgery (SRS) and stereotactic body radiation therapy (SBRT) demand high precision.
  • Accurate coincidence of mechanical, imaging, and radiation isocenters is critical for treatment efficacy.
  • The Winston-Lutz (WL) test is a standard method for verifying isocenter alignment, but can be time-consuming.

Purpose of the Study:

  • To develop and validate novel methods using the Portal Dosimetry Scripting Application Programming Interface (PDSAPI) to streamline the WL test.
  • To reduce the time burden associated with routine WL testing and documentation.
  • To assess the accuracy and efficiency of PDSAPI for WL testing compared to existing methods.

Main Methods:

  • Developed and implemented a PDSAPI-based tool for analyzing WL imaging data.
  • Compared PDSAPI results against two commercial software packages (RIT and DoseLab) and two manual ground truth methods.
  • Analyzed 20 WL test datasets, comprising 10 fields each (200 images total).

Main Results:

  • PDSAPI demonstrated high agreement with other methods, with over 99.5% of 1D shifts matching within ±0.33 mm.
  • Agreement within ±0.22 mm and ±0.11 mm was achieved for 96% and 63% of shifts, respectively.
  • Similar accuracy trends were observed for 2D displacement analysis.

Conclusions:

  • The PDSAPI-based WL test achieves accuracy comparable to commercial software solutions.
  • This novel application significantly reduces data transfer time and has the potential to facilitate daily WL testing.
  • PDSAPI offers data storage and easy access to imaging and shift data, enhancing workflow efficiency.