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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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Skin dose mapping for non-uniform x-ray fields using a backscatter point spread function.

Sarath Vijayan1,2, Zhenyu Xiong1,2, Alok Shankar1,2

  • 1Toshiba Stroke and Vascular Research Center, University at Buffalo, Buffalo, NY, USA.

Proceedings of Spie--The International Society for Optical Engineering
|June 27, 2017
PubMed
Summary
This summary is machine-generated.

Beam shaping devices alter x-ray intensity, affecting patient skin dose. A new backscatter convolution technique accurately calculates this dose, validated with Gafchromic film for improved radiation therapy.

Keywords:
EGSnrcROI attenuatorbackscattercompensation filterdosepoint spread function

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Area of Science:

  • Medical Physics
  • Radiological Sciences
  • Radiation Dosimetry

Background:

  • Beam shaping devices (ROI attenuators, compensation filters) alter x-ray intensity distributions.
  • This modulation causes spatial variations in patient skin dose due to primary and backscattered radiation.
  • Accurate skin dose assessment is crucial for radiation therapy and interventional procedures.

Purpose of the Study:

  • To develop and validate a convolution technique for determining backscatter dose distribution.
  • To integrate this technique into a dose tracking system (DTS) for real-time skin dose monitoring.
  • To improve the accuracy of patient skin dose calculations in procedures utilizing shaped x-ray beams.

Main Methods:

  • Generated backscatter point spread functions (PSF) using EGS Monte-Carlo simulations for head and PMMA phantoms.
  • Normalized PSF's (PSF_n) were curve-fit with a Lorentzian function.
  • Convolved normalized PSF's with primary dose distributions to calculate scatter dose, then added to primary dose for total dose.
  • Developed a convolution method for non-uniformly spaced graphic model vertices.
  • Validated the technique using Gafchromic film measurements for shaped x-ray beams.

Main Results:

  • Backscatter PSF's were successfully generated and modeled.
  • The backscatter convolution technique accurately calculated total dose distributions.
  • Calculated dose distributions showed close agreement with Gafchromic film measurements.
  • The technique was successfully incorporated into a DTS for 3D dose mapping.

Conclusions:

  • The developed backscatter convolution technique provides accurate skin dose estimation for shaped x-ray beams.
  • This method enhances the capabilities of dose tracking systems for real-time monitoring during fluoroscopic procedures.
  • The findings support improved patient safety and treatment planning in radiation oncology and interventional radiology.