Abstract：
OBJECTIVES:To evaluate the performance of RapidArc® (Eclipse 10.0.28) and SmartArc® (Pinnacle 9.0) radiotherapy plans for lung stereotactic body radiation therapy (SBRT) in terms of dosimetric plan quality, delivery efficiency, inhomogeneity corrections and accuracy of dose delivery using a custom-built heterogeneity insert for ArcCHECK™ (Sun Nuclear Corp., FL, USA). METHODS:SmartArc® and RapidArc® plans were generated for 10 patients. The quality of the plans was evaluated in terms of conformity indices (R100 and R50 ) and the dose to the organs at risk. The efficiency was evaluated in terms of the monitor units (MUs) required for a given prescription dose. For dose verification, we designed and manufactured a heterogeneity insert for ArcCHECK™ with densities that simulate soft tissue, lung, bone, and air and having multiple locations for point dose measurements. Accuracy of dose delivery was assessed using gamma analysis. RESULTS:The overall plan quality was similar when comparing SmartArc® with RapidArc®. However, RapidArc® plans required significantly more MUs-up to 72%™compared with SmartArc® plans (p<0.001). ArcCHECK™ measurements in the presence of inhomogeneities showed better agreement for SmartArc® plans. CONCLUSION:Plan quality for SmartArc® and RapidArc® was comparable. However, SmartArc® plans were more efficient, requiring significantly fewer monitor units, and were delivered more accurately in a non-homogeneous phantom. With the custom-built heterogeneity insert, ArcCHECK™ can be used efficiently to verify inhomogeneity corrections and dose delivery accuracy for lung SBRT plans.
journal_name
Med Physjournal_title
Medical physicsauthors
Fakir H,Hoover D,Chen JZdoi
10.1118/1.4740172subject
Has Abstractpub_date
2012-07-01 00:00:00pages
4637issue
7Part3eissn
0094-2405issn
2473-4209journal_volume
39pub_type
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