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Comparison of two beam angular optimization algorithms guided by automated multicriterial IMRT.

Tiago Ventura1, Humberto Rocha2, Brigida da Costa Ferreira3

  • 1Physics Department of University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Medical Physics Department of Instituto Português de Oncologia de Coimbra Francisco Gentil, EPE, Avenida Bissaya Barreto, n° 98, 3000-075 Coimbra, Portugal; Institute for Systems Engineering and Computers at Coimbra, Rua Sílvio Lima, 3030-290 Coimbra, Portugal.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|September 14, 2019
PubMed
Summary
This summary is machine-generated.

Two beam angle optimization (BAO) algorithms were compared for nasopharynx intensity-modulated radiation therapy. Algorithm B showed marginally better plan quality than algorithm i, though both achieved high-quality results.

Keywords:
Beam angular optimizationMulticriteria optimizationPlan quality assessment

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Cancer Treatment

Background:

  • Intensity-modulated radiation therapy (IMRT) is a cornerstone of modern cancer treatment.
  • Beam Angle Optimization (BAO) is crucial for improving IMRT plan quality by selecting optimal beam angles.
  • Multicriterial optimization frameworks allow for balancing competing objectives in treatment planning.

Purpose of the Study:

  • To compare the performance of two distinct BAO algorithms (discrete search vs. continuous search) within a multicriterial optimization framework.
  • To evaluate these algorithms for both coplanar and non-coplanar treatment geometries in nasopharynx cancer.
  • To assess the impact of different BAO algorithms on IMRT plan quality.

Main Methods:

  • Retrospective analysis of 40 nasopharynx patient plans using the Erasmus-iCycle multicriterial optimization platform.
  • Implementation of two BAO algorithms: Algorithm i (discrete search) and Algorithm B (continuous search).
  • Plan quality evaluation using SPIDERplan, including statistical assessment of differences.

Main Results:

  • Algorithm i produced more asymmetric beam distributions in coplanar plans compared to Algorithm B.
  • Algorithm i resulted in larger deviations from coplanarity during non-coplanar beam optimization.
  • Both algorithms yielded comparable overall plan quality, with Algorithm B demonstrating a slight advantage.

Conclusions:

  • Multicriterial and beam angular optimization significantly enhance IMRT plan quality for nasopharynx cancer.
  • While average plan quality was similar, individual patient cases showed notable differences between the algorithms.
  • Algorithm B may offer a marginal benefit over Algorithm i in achieving optimal beam arrangements.