Journal article
The commissioning and validation of Monaco treatment planning system on an Elekta VersaHD linear accelerator
Journal of applied clinical medical physics, Vol.20(1), pp.184-193
01/2019
DOI: 10.1002/acm2.12507
PMCID: PMC6333122
PMID: 30525308
Abstract
Accurate beam modeling is essential to help ensure overall accuracy in the radiotherapy process. This study describes our experience with beam model validation of a Monaco treatment planning system on a Versa
HD
linear accelerator. Data were collected such that Monaco beam models could be generated using three algorithms: collapsed cone (
CC
) and photon Monte Carlo (
MC
) for photon beams, and electron Monte Carlo (
eMC
) for electron beams. Validations are performed on measured percent depth doses (
PDD
s) and profiles, for open‐field point‐doses in homogenous and heterogeneous media, and for obliquely incident electron beams. Gamma analysis is used to assess the agreement between calculation and measurement for intensity modulated radiation therapy (
IMRT
) and volumetric modulated arc therapy (
VMAT
) plans, including volumetric modulated arc therapy for stereotactic body radiation therapy (
VMAT SBRT
). For all relevant conditions, gamma index values below 1 are obtained when comparing Monaco calculated
PDD
s and profiles with measured data. Point‐doses in a water medium are found to be within 2% agreement of commissioning data in 99.5% and 98.6% of the points computed by
MC
and
CC
, respectively. All point‐dose calculations for the
eMC
algorithm in water are within 4% agreement of measurement, and 92% of measurements are within 3%. In heterogeneous media of air and cortical bone, both
CC
and
MC
yielded better than 3% agreement with ion chamber measurements.
eMC
yielded 3% agreement to measurement downstream of air with oblique beams of up to 27°, 5% agreement distal to bone, and within 4% agreement at extended source to surface distance (
SSD
) for all electron energies except 6 MeV. The 6‐MeV point of measurement is on a steep dose gradient which may impact the magnitude of discrepancy measured. The average gamma passing rate for
IMRT
/
VMAT
plans is 96.9% (±2.1%) and 98.0% (±1.9%) for
VMAT SBRT
when evaluated using 3%/2 mm criteria. Monaco beam models for the Versa
HD
linac were successfully commissioned for clinical use.
Details
- Title: Subtitle
- The commissioning and validation of Monaco treatment planning system on an Elekta VersaHD linear accelerator
- Creators
- Jeffrey E Snyder - University of Iowa Hospitals and ClinicsDaniel E Hyer - University of Iowa Hospitals and ClinicsRyan T Flynn - University of Iowa Hospitals and ClinicsAmanda Boczkowski - University of Iowa Hospitals and ClinicsDongxu Wang - University of Iowa Hospitals and Clinics
- Resource Type
- Journal article
- Publication Details
- Journal of applied clinical medical physics, Vol.20(1), pp.184-193
- DOI
- 10.1002/acm2.12507
- PMID
- 30525308
- PMCID
- PMC6333122
- NLM abbreviation
- J Appl Clin Med Phys
- ISSN
- 1526-9914
- eISSN
- 1526-9914
- Publisher
- John Wiley and Sons Inc; Hoboken
- Alternative title
- SNYDER et al
- Language
- English
- Date published
- 01/2019
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiation Oncology
- Record Identifier
- 9984047699202771
Metrics
42 Record Views