The role of complexity metrics in a multi-institutional dosimetry audit of VMAT

To demonstrate the benefit of complexity metrics such as the modulation complexity score (MCS) and monitor units (MUs) in multi-institutional audits of volumetric-modulated arc therapy (VMAT) delivery. 39 VMAT treatment plans were analysed using MCS and MU. A virtual phantom planning exercise was pl...

Full description

Saved in:
Bibliographic Details
Published in:British journal of radiology 2016-01, Vol.89 (1057), p.20150445-20150445
Main Authors: McGarry, Conor K, Agnew, Christina E, Hussein, Mohammad, Tsang, Yatman, McWilliam, Alan, Hounsell, Alan R, Clark, Catharine H
Format: Article
Language:English
Subjects:
Algorithms
Humans
Particle Accelerators
Phantoms, Imaging
Radiometry
Radiotherapy and Oncology
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted - methods
Radiotherapy Planning, Computer-Assisted - statistics & numerical data
Radiotherapy, Intensity-Modulated - methods
Radiotherapy, Intensity-Modulated - statistics & numerical data
Technical/Instrumental
United Kingdom
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:To demonstrate the benefit of complexity metrics such as the modulation complexity score (MCS) and monitor units (MUs) in multi-institutional audits of volumetric-modulated arc therapy (VMAT) delivery. 39 VMAT treatment plans were analysed using MCS and MU. A virtual phantom planning exercise was planned and independently measured using the PTW Octavius(®) phantom and seven29(®) 2D array (PTW-Freiburg GmbH, Freiburg, Germany). MCS and MU were compared with the median gamma index pass rates (2%/2 and 3%/3 mm) and plan quality. The treatment planning systems (TPS) were grouped by VMAT modelling being specifically designed for the linear accelerator manufacturer's own treatment delivery system (Type 1) or independent of vendor for VMAT delivery (Type 2). Differences in plan complexity (MCS and MU) between TPS types were compared. For Varian(®) linear accelerators (Varian(®) Medical Systems, Inc., Palo Alto, CA), MCS and MU were significantly correlated with gamma pass rates. Type 2 TPS created poorer quality, more complex plans with significantly higher MUs and MCS than Type 1 TPS. Plan quality was significantly correlated with MU for Type 2 plans. A statistically significant correlation was observed between MU and MCS for all plans (R = -0.84, p 
ISSN:0007-1285
1748-880X
DOI:10.1259/bjr.20150445