Multi-institutional comparison of computer-based independent dose calculation for intensity modulated radiation therapy and volumetric modulated arc therapy.
Phys Med
; 45: 72-81, 2018 Jan.
Article
en En
| MEDLINE
| ID: mdl-29472094
ABSTRACT
PURPOSE:
No multi-institutional studies of computer-based independent dose calculation have addressed the discrepancies among radiotherapy treatment planning systems (TPSs) and the verification programs for intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT). We conducted a multi-institutional study to investigate whether ±5% is a reasonable action level for independent dose calculation for IMRT/VMAT.METHODS:
In total, 477 IMRT/VMAT plans for prostate or head and neck (H&N) malignancies were retrospectively analyzed using a modified Clarkson-based commercial verification program. The doses from the TPSs and verification programs were compared using the mean ±1 standard deviation (SD).RESULTS:
In the TPS-calculated dose comparisons for prostate and H&N malignancies, the sliding window (SW) technique (-2.5⯱â¯1.8% and -5.3⯱â¯2.6%) showed greater negative systematic differences than the step-and-shoot (S&S) technique (-0.3⯱â¯2.2% and -0.8⯱â¯2.2%). The VMAT dose differences for prostate and H&N malignancies were 0.9⯱â¯1.8% and 1.1⯱â¯3.3%, respectively. The SDs were larger for the H&N plans than for the prostate plans in both IMRT and VMAT. Such plans including more out-of-field control points showed greater systematic differences and SDs.CONCLUSIONS:
This study will help individual institutions to establish an action level for agreement between primary calculations and verification for IMRT/VMAT. A local dose difference of ±5% at a point within the planning target volume (above -350â¯HU) may be a reasonable action level.Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Dosificación Radioterapéutica
/
Planificación de la Radioterapia Asistida por Computador
/
Radioterapia de Intensidad Modulada
Tipo de estudio:
Observational_studies
Límite:
Humans
/
Male
Idioma:
En
Revista:
Phys Med
Asunto de la revista:
BIOFISICA
/
BIOLOGIA
/
MEDICINA
Año:
2018
Tipo del documento:
Article