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Optimizing monoscopic kV fluoro acquisition for prostate intrafraction motion evaluation.

Justus Adamson1, Qiuwen Wu

  • 1Department of Radiation Oncology, Wayne State University, 4100 John R, Detroit, MI 48201, USA.

Physics in Medicine and Biology
|December 17, 2008
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Summary
This summary is machine-generated.

This study optimizes monoscopic kV imaging for prostate cancer radiotherapy, achieving accurate 3D localization with minimal imaging dose. Optimized protocols reduce dose by 15-40% compared to standard methods.

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Image Guidance

Background:

  • Monoscopic kV imaging is used for prostate intrafraction motion evaluation in radiotherapy.
  • Detailed studies on 3D localization accuracy and dose optimization for monoscopic kV imaging are limited.

Purpose of the Study:

  • To optimize kV acquisition parameters and imaging protocols for improved 3D prostate localization and 2D image registration accuracy.
  • To minimize imaging dose during radiotherapy while maintaining accuracy.

Main Methods:

  • Simulated prostate motion using cine-MRI data to assess 3D localization techniques.
  • Investigated the impact of kV acquisition parameters, including mAs, on 2D image registration accuracy.
  • Measured imaging dose using a phantom to determine acceptable accuracy levels.

Main Results:

  • Simulations indicate a localization error of <1.5 mm for 95% of cases with optimized protocols.
  • Imaging dose varied from 0.4 to 5.5 mGy, significantly lower than CBCT (21.1 mGy).
  • Optimizing mAs with acquisition angle reduced imaging dose by 15-40%; higher mAs needed for images during MV beam delivery.

Conclusions:

  • Optimized monoscopic kV imaging protocols can achieve accurate 3D prostate localization with significantly reduced imaging dose.
  • Protocol optimization, not necessarily higher imaging frequency or gantry rotation acquisition, is key to reducing uncertainty.
  • This approach offers a safer alternative to CBCT for intrafraction motion management in prostate radiotherapy.