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A dosimetric study of volumetric modulated arc therapy planning techniques for treatment of low-risk prostate cancer in patients with bilateral hip prostheses.

South Asian journal of cancerยท2014
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Dose prediction accuracy of anisotropic analytical algorithm and pencil beam convolution algorithm beyond high

Suresh B Rana1

  • 1Department of Radiation Oncology, Arizona Center for Cancer Care, Peoria, AZ, USA.

South Asian Journal of Cancer
|January 24, 2014
PubMed
Summary
This summary is machine-generated.

The anisotropic analytical algorithm (AAA) more accurately calculates radiation doses than pencil beam convolution (PBC) when treating tumors near dense bone. This improves accuracy in photon beam radiation therapy for complex patient anatomies.

Keywords:
Anisotropic analytical algorithmdose predictionhigh density heterogeneityinhomogeneity correctionspencil beam convolution

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Radiotherapy Dosimetry

Background:

  • Accurate dose calculation is crucial for effective photon beam radiation therapy.
  • Heterogeneity in patient anatomy, such as bone, presents challenges for dose calculation algorithms.
  • Pencil beam convolution (PBC) and anisotropic analytical algorithm (AAA) are commonly used algorithms.

Purpose of the Study:

  • To evaluate and compare the accuracy of PBC and AAA in predicting radiation doses.
  • To assess algorithm performance beyond high-density heterogeneities, specifically bone.
  • To quantify dose discrepancies between calculated and measured values.

Main Methods:

  • A five-layer anthropomorphic phantom with water, air, bone, and water layers was created.
  • Depth doses were calculated using AAA and PBC (Eclipse v8.6.15) for 6 MV photon beams.
  • Measured doses were acquired using an ionization chamber in a physical phantom mimicking the heterogeneous structure.

Main Results:

  • AAA demonstrated better agreement with measured doses compared to PBC across all depths.
  • Both algorithms showed dose overestimation near the high-density heterogeneity interface (AAA: up to 5.3%, PBC: up to 6.7%).
  • Discrepancies increased with larger field sizes and may stem from beam modeling inaccuracies in heterogeneous media.

Conclusions:

  • AAA is more accurate than PBC for dose calculations in the presence of high-density heterogeneities.
  • The findings support the use of AAA for improved treatment planning in complex anatomical regions.
  • Further investigation into beam modeling for heterogeneous media is warranted.