Error Detectability of Isodose Volumes as ROIs in Prostate Intensity-modulated RT QA.
In Vivo
; 36(4): 1887-1895, 2022.
Article
en En
| MEDLINE
| ID: mdl-35738601
ABSTRACT
BACKGROUND/AIM:
To evaluate the quality of error detectability with a three-dimensional verification system using isodose volumes as regions of interest (ROIs) in quality assurance (QA) of intensity-modulated radiation therapy. PATIENTS ANDMETHODS:
Treatment plans with four types of intentional errors were created from the data of 20 patients with localized prostate cancer. These plans underwent QA using the three-dimensional verification system. The datasets of another 30 cases without inserted errors were assessed as controls. The ROIs used in the evaluations were those used in our conventional method (planning target volume, rectum, and bladder). The isodose volume method (5%, 50% and 95% isodose volume) and the error detection rates (measurement above the tolerance values, as set from the other 30 cases) were assessed and compared.RESULTS:
There was significantly higher multileaf collimator systematic closed error detectability with the isodose volume method compared to the conventional method (A-side 0.2 mm p=0.005, A-side 0.35 mm p=0.002, B-side 0.2 mm p=0.001 and B-side 0.35 mm p=0.010). There were no error types for which the error detection rate of the isodose volume method was lower than that of the conventional method.CONCLUSION:
The isodose volume method was able to evaluate the irradiated ROIs that could be delineated, and improved error detectability. This method has the potential to provide a wider margin of safety in intensity-modulated radiation therapy.Palabras clave
Texto completo:
1
Colección:
01-internacional
Asunto principal:
Neoplasias de la Próstata
/
Radioterapia de Intensidad Modulada
Límite:
Humans
/
Male
Idioma:
En
Revista:
In Vivo
Asunto de la revista:
NEOPLASIAS
Año:
2022
Tipo del documento:
Article
País de afiliación:
Japón