View : 428 Download: 0
The effect of MLC speed and acceleration on the plan delivery accuracy of VMAT
- Title
- The effect of MLC speed and acceleration on the plan delivery accuracy of VMAT
- Authors
- Park, J. M.; Wu, H-G; Kim, J. H.; Carlson, J. N. K.; Kim, K.
- Ewha Authors
- 김규보
- SCOPUS Author ID
- 김규보
- Issue Date
- 2015
- Journal Title
- BRITISH JOURNAL OF RADIOLOGY
- ISSN
- 0007-1285
1748-880X
- Citation
- BRITISH JOURNAL OF RADIOLOGY vol. 88, no. 1049
- Publisher
- BRITISH INST RADIOLOGY
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Objective: To determine a new metric utilizing multileaf collimator (MLC) speeds and accelerations to predict plan delivery accuracy of volumetric modulated arc therapy (VMAT). Methods: To verify VMAT delivery accuracy, gamma evaluations, analysis of mechanical parameter difference between plans and log files, and analysis of changes in dose-volumetric parameters between plans and plans reconstructed with log files were performed with 40 VMAT plans. The average proportion of leaf speeds ranging from l to h cm s(-1) (Sl-h and l-h = 0-0.4, 0.4-0.8, 0.8-1.2, 1.2-1.6 and 1.6-2.0), mean and standard deviation of MLC speeds were calculated for each VMAT plan. The same was carried out for accelerations in centimetre per second squared (A(l-h) and l-h = 0-4, 4-8, 8-12, 12-16 and 16-20). The correlations of those indicators to plan delivery accuracy were analysed with Spearman's correlation coefficient (r(s)). Results: The S1.2-1.6 and mean acceleration of MLCs showed generally higher correlations to plan delivery accuracy than did others. The highest r(s) values were observed between S1.2-1.6 and global 1%/2mm (r(s) = -0.698 with p<0.001) as well as mean acceleration and global 1%/2mm (r(s) = -0.650 with p<0.001). As the proportion of MLC speeds and accelerations >0.4 and 4 cm s(-2) increased, the plan delivery accuracy of VMAT decreased. Conclusion: The variations in MLC speeds and accelerations showed considerable correlations to VMAT delivery accuracy. Advances in knowledge: As the MLC speeds and accelerations increased, VMAT delivery accuracy reduced.
- DOI
- 10.1259/bjr.20140698
- Appears in Collections:
- 의과대학 > 의학과 > Journal papers
- Files in This Item:
There are no files associated with this item.
- Export
- RIS (EndNote)
- XLS (Excel)
- XML