Test cases for commissioning an add-on micro multi-leaf collimator Apex for stereotactic radiosurgery treatments

Autores

  • Javier Pérez Curbelo Instituto Nacional de Ocología y Radiobiología, Havana, Cuba.
  • Rogelio Diaz Moreno Instituto Nacional de Ocología y Radiobiología, Havana, Cuba.
  • Roberto Caballero Pinelo Hospital Hermanos Ameijeiras

DOI:

https://doi.org/10.29384/rbfm.2020.v14.19849001533

Palavras-chave:

stereotactic radiosurgery, commissioning process, test cases

Resumo

Two comprehensive test cases are presented for dosimetric commissioning of a radiosurgery system, in a hospital where dedicated phantoms are not available. The system consisted of an Elekta Precise linear accelerator, an Apex micro multi-leaf collimator, and a Monaco treatment planning system (TPS). The purpose of Test I was to assess the dose accuracy with coplanar arc beams. Test II was an end-to-end type test, a rigid Leksell stereotactic frame was fixed to a watermelon phantom and Ergo++ TPS was used for stereotactic coordinates definition. The purpose of Test II was to assess the dose accuracy with non-coplanar arc beams and the influence of geometrical accuracy in the whole process. Ionization chambers were used for dose measurements. Results of Test I showed that discrepancies below 1% are achievable, while results of Test II allowed detection of geometric shifts < 1 mm with dose discrepancies lower than 1%. To the best of our knowledge, there are not published works reporting test cases for commissioning a stereotactic radiosurgery system like the one tested in this work. The designed test cases showed adequacy for assessment of TPS accuracy in complex treatment configurations, like those used in stereotactic radiosurgery.

Downloads

Não há dados estatísticos.

Biografia do Autor

Javier Pérez Curbelo, Instituto Nacional de Ocología y Radiobiología, Havana, Cuba.

Medical Physicist, Radiotheraphy Department

Rogelio Diaz Moreno, Instituto Nacional de Ocología y Radiobiología, Havana, Cuba.

Medical Physicist, Radiotheraphy Department

Roberto Caballero Pinelo, Hospital Hermanos Ameijeiras

Medical Physicist, Radiotheraphy Department

Referências

Schell MC, Bova FJ, Larson DA, Leavitt DD, Latz WR, Podgorask EB, et al. Stereotactic Radiosurgery. Report of Task Group 42. AAPM report No. 54. 1995.

International Atomic Energy Agency. Commissioning and Quality Assurance of Computerized Planning Systems for Radiation Treatment of Cancer. IAEA TRS No. 430. 2004.

International Atomic Energy Agency. Specification and Acceptance Testing of Radiotherapy Treatment Planning Systems. IAEA TEC-DOC 1540. 2007.

International Atomic Energy Agency. Commissioning of radiotherapy treatment planning systems: testing for typical external beam treatment techniques. IAEA TEC-DOC 1583. 2008.

Klein EE, Hanley J, Bayouth J, Yin FF, Simon W, Dresser S, et al. Task group 142 report: Quality assurance of medical accelerators. Med Phys. 2009; 36:4197–212.

Heukelom S, Hoffmans-Holtzer N, Marijnissen H, Nulens A, Pittomvils G, Raaijmakers E, et al. Process management and quality assurance for intracranial stereotactic treatment. NCS Report 25. 2015.

The International Commission on Radiation Units and Measurements. Prescribing, recording, and reporting of stereotactic treatments with small photon beams. ICRU Report No. 91. Journal of the ICRU. 2017; 14.

Halvorsen PH, Cirino E, Das IJ, Garrett JA, Yang J, Yin FF, et al. AAPM-RSS Medical Physics Practice Guideline 9.a. for SRS-SBRT. AAPM Reports and Documents. 2017.

Parsai S, Salehi N. Improving Access to Cancer Care: Watermelon as a Quality Assurance Phantom for Cranial Stereotactic Radiosurgery Treatments. Int J Radiat Oncol Biol Phys. 2016; 96: E614–5.

International Atomic Energy Agency. Absorbed Dose Determination in External Beam Radiotherapy based on Standards of Absorbed Dose to Water. IAEA TRS No.398. 2006.

Sánchez-Doblado F, Hartmann GH, Pena J, Capote R, Paiusco M, Rhein B, et al. Uncertainty Estimation in Intensity-Modulated Radiotherapy Absolute Dosimetry Verification. Int J Radiat Oncol Biol Phys. 2007; 68: 301–10.

Downloads

Publicado

2020-12-06

Como Citar

Pérez Curbelo, J., Diaz Moreno, R., & Caballero Pinelo, R. (2020). Test cases for commissioning an add-on micro multi-leaf collimator Apex for stereotactic radiosurgery treatments. Revista Brasileira De Física Médica, 14, 533. https://doi.org/10.29384/rbfm.2020.v14.19849001533

Edição

Seção

Comunicação Técnica