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Planar IGRT dose reduction: A practical approach.

Alec M Block1, Jason Luce1, Jeffrey Y Lin1

  • 1Loyola University Medical Center, Department of Radiation Oncology, Maywood, Illinois.

Practical Radiation Oncology
|November 27, 2014
PubMed
Summary
This summary is machine-generated.

Reducing kilovoltage (kV) x-ray imaging dose in radiation therapy is feasible. Lowering milliampere-seconds (mAs) significantly cuts skin dose by approximately 50% without impacting image quality (contrast-to-noise ratio).

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Area of Science:

  • Medical Physics
  • Radiology
  • Radiation Oncology

Background:

  • Patients undergoing radiation therapy can receive significant cumulative skin dose from kilovoltage (kV) planar x-ray imaging.
  • Optimizing imaging parameters is crucial for balancing diagnostic image quality with patient radiation exposure.

Purpose of the Study:

  • To retrospectively estimate the cumulative skin dose from kV planar x-rays in 90 patients treated on a Varian iX system.
  • To determine if this dose could be reduced without compromising image quality.

Main Methods:

  • Developed a global equation to estimate skin dose based on imaging settings (kVp, mAs), source-to-skin distance, and image count.
  • Systematically reduced milliampere-seconds (mAs) for phantom images, assessing contrast-to-noise ratio (CNR) and skin dose.
  • Applied optimized, reduced mAs settings to 7 patients undergoing image-guided radiation therapy, comparing CNR and skin dose.

Main Results:

  • Average cumulative kV imaging dose reached up to 162.2 cGy for pelvic cases.
  • Reducing mAs decreased skin dose by 49% with a negligible 0.9% drop in CNR.
  • In clinical application, reduced mAs yielded statistically similar CNR values (P = .79) while lowering skin dose by ~50%.

Conclusions:

  • Significant cumulative skin dose from kV planar imaging necessitates dose reduction strategies.
  • Reducing mAs is a clinically feasible method for achieving substantial planar dose reduction without sacrificing image quality.