| Full text | |
| Author(s): |
Lizar, Jessica Caroline
[1]
;
Volpato, Karina Cristina
[2]
;
Brandao, Fernanda Calixto
[2]
;
Guimaraes, Flavio da Silva
[2]
;
Arruda, Gustavo Viani
[3]
;
Pavoni, Juliana Fernandes
[1, 3]
Total Authors: 6
|
| Affiliation: | [1] Univ Sao Paulo, Fac Philosophy Sci & Letters Ribeirao Preto, Dept Phys, Av Bandeirantes 3900, BR-14040901 Ribeirao Preto, SP - Brazil
[2] Sao Carlos Radiotherapy Ctr, Rua Maestro Joao Seppe S-N, BR-13561180 Sao Carlos - Brazil
[3] Univ Sao Paulo, Ribeirao Preto Med Sch Hosp & Clin, Radiotherapy Dept, Av Bandeirantes 3900, BR-14040900 Ribeirao Preto, SP - Brazil
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS; v. 81, p. 60-68, JAN 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
Purpose: To evaluate the respiratory motion influence on the tridimensional (3D) dose delivery to breast-shaped phantoms using conformal radiotherapy (3D-RT), Field-in Field (FiF), and IMRT planning techniques. Methods: This study used breast-shaped phantoms filled with MAGIC-f gel dosimeter to simulate the breast, and an oscillation platform to simulate the respiratory motion. The platform allowed motion in the anterior-posterior direction with oscillation amplitudes of 0.34 cm, 0.88 cm, and 1.22 cm. CT images of the static phantom were used for the 3D-RT, FiF, and IMRT treatment planning. Five phantoms were prepared and irradiated for each planning technique evaluated. Phantom 1 was irradiated static, phantoms 2-4 were irradiated moving with the three different motion amplitudes, and phantom 5 was used as a reference. The 3D dose distributions were obtained by relaxometry of magnetic resonance imaging, and the respiratory motion influence in the doses distribution was accessed by gamma evaluations (3%/3mm/15% threshold) comparing the measurements of the phantoms irradiated under movement with the static ones. Results: The mean gamma approvals for three oscillatory amplitudes were 96.44%, 93.23%, and 91.65%; 98.42%, 95.66%, and 94.31%; and 94.49%, 93.51%, and 86.62% respectively for 3D-RT, FiF and IMRT treatments. A gamma results profile per slice along the phantom showed that for FiF and IMRT irradiations, most of the failures occurred in the central region of the phantom. Conclusions: By increasing the respiratory motion movement, the dose distribution variations for the three planning techniques were more pronounced, being the FiF technique variations the smallest one. (AU) | |
| FAPESP's process: | 14/03370-6 - Clinical applications and optimization of polymeric gel dosimetry technique |
| Grantee: | Juliana Fernandes Pavoni |
| Support Opportunities: | Regular Research Grants |