Verificação das etapas de registro e delineamento em planejamentos de radiocirurgia estereotáxica

Authors

  • Laura Furnari Instituto de Radiologia, InRad – Setor de Radioterapia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo https://orcid.org/0000-0002-4039-1152
  • Ana Paula Vollet Cunha Instituto de Radiologia, InRad – Setor de Radioterapia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo https://orcid.org/0000-0001-8346-7519
  • Caroline Zeppelin dos Santos Emiliozzi Instituto de Radiologia, InRad – Setor de Radioterapia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo
  • Caroline Castilhano Sampaio Instituto de Câncer do Estado de São Paulo https://orcid.org/0000-0002-3270-4112
  • Carlos Eduardo Bravin Maistro Instituto de Radiologia, InRad – Setor de Radioterapia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo
  • Marcus Vinicius Saad de Paula Rodrigues Instituto de Radiologia, InRad – Setor de Radioterapia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo https://orcid.org/0009-0008-1343-2992
  • Victor Augusto Bertotti Ribeiro Instituto de Radiologia, InRad – Setor de Radioterapia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo

DOI:

https://doi.org/10.29384/rbfm.2022.v16.19849001695

Keywords:

stereotaxic radiosurgery; image registration; delineation; StereoPHAN; quality control.

Abstract

Some requirements in the quality assurance process are necessary to perform special treatments, such as stereotaxic cranial radiosurgery (CR). Among some points of attention, it is possible to mention small-field dosimetry; validation of the planning system; assessment of IGRT systems; teams training, end-to-end test; periodic quality controls definition and others. The goals of this work were to verify the steps of image acquisition, registration and delineation of structures in a radiosurgery plan, bringing greater security to the process. Using Sun Nuclear's StereoPHAN phantom, computed tomography, magnetic resonance imaging and planar images obtained from a angiography device were acquired from the phantom and imported into the treatment planning system (SPC) iPlan. The images were visually and quantitatively inspected, using metrics such as the Target Registration Error (TRE), internal cavities dimensions evaluation and variations between the edges of the volumes delineated between the different series of images. The results were satisfactory for the analysis of the TRE, being smaller than the size of one voxel in the fusion process, the superposition of the delineation of the spheres, did not present a difference in the edges greater than 1 mm, but the calculated volumes were superior to the smaller spheres when delineated using the planar images. This fact is related to the low contrast of the planar images obtained, causing the delineation to be slightly larger than expected. It is concluded, therefore, that the SPC used is adequate for the processes tested in CR and the SteroPHAN phantom contributed to an independent verification, even though the institution already has established quality controls for the practice of CR.

Downloads

Download data is not yet available.

Author Biography

Laura Furnari, Instituto de Radiologia, InRad – Setor de Radioterapia, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo

Grande área: Ciências Exatas e da Terra / Área: Física / Subárea: Controle de qualidade em radioterapia.
Grande área: Ciências Exatas e da Terra / Área: Física / Subárea: Física Médica/Especialidade: Dosimetria das Radiações Ionizantes.
Grande área: Ciências Exatas e da Terra / Área: Física / Subárea: Física Médica/Especialidade: Radioterapia.

References

Schell, M.C. et al. Stereotactic Radiosurgery: AAPM Report No 54. Radiation Therapy Committee Report of Task Group 42, USA, June 1995.

Halvorsen, P. H. et al. AAPM-RSS Medical Physics Practice Guideline 9.a. for SRS-SBRT. J. Appl. Clin. Med. Phys., v. 18, n. 5, p. 10-21, 2017.

Smith, K. et al. AAPM Medical Physics Practice Guideline 8.a.: Linear accelerator performance tests. J. Appl. Clin. Med. Phys., v. 18, n. 4, p. 23-39, 2017.

Klein, E. E. et al. Task Group 142 report: Quality assurance of medical accelerators. Med.Phys., v. 36, n. 9, set. 2009.

Furnari, L. e Colaboradores. Controle da qualidade em radioterapia. 2ª Ed. São Paulo, Brasil (2021).

American Association of Physicist in Medicine (AAPM). Radiation Therapy Committee Task Group 132 Use of image registration and fusion algorithms and techniques in radiotherapy. Med. Phys., v. 44, n. 7, 2017.

Published

2022-12-30

How to Cite

Furnari, L., Vollet Cunha , A. P., Zeppelin dos Santos Emiliozzi, C., Castilhano Sampaio, C., Bravin Maistro, C. E., Saad de Paula Rodrigues, M. V., & Bertotti Ribeiro, V. A. . (2022). Verificação das etapas de registro e delineamento em planejamentos de radiocirurgia estereotáxica. Brazilian Journal of Medical Physics, 16, 695. https://doi.org/10.29384/rbfm.2022.v16.19849001695

Issue

Section

Artigo Original

Most read articles by the same author(s)

<< < 1 2