open access

Vol 21, No 1 (2016)
Original research articles
Published online: 2016-01-01
Submitted: 2015-05-17
Get Citation

Analyzing the performance of ArcCHECK diode array detector for VMAT plan

Rajesh Thiyagarajan, Arunai Nambiraj, Sujit Nath Sinha, Girigesh Yadav, Ashok Kumar, Vikraman Subramani, - Kothandaraman
DOI: 10.1016/j.rpor.2015.10.004
·
Rep Pract Oncol Radiother 2016;21(1):50-56.

open access

Vol 21, No 1 (2016)
Original research articles
Published online: 2016-01-01
Submitted: 2015-05-17

Abstract

Aim

The aim of this study is to evaluate performance of ArcCHECK diode array detector for the volumetric modulated arc therapy (VMAT) patient specific quality assurance (QA). VMAT patient specific QA results were correlated with ion chamber measurement. Dose response of the ArcCHECK detector was studied.

Background

VMAT delivery technique improves the dose distribution. It is complex in nature and requires proper QA before its clinical implementation. ArcCHECK is a novel three dimensional dosimetry system.

Materials and methods

Twelve retrospective VMAT plans were calculated on ArcCHECK phantom. Point dose and dose map were measured simultaneously with ion chamber (IC-15) and ArcCHECK diode array detector, respectively. These measurements were compared with their respective TPS calculated values.

Results

The ion chamber measurements are in good agreement with TPS calculated doses. Mean difference between them is 0.50% with standard deviation of 0.51%. Concordance correlation coefficient (CCC) obtained for ion chamber measurements is 0.9996. These results demonstrate a strong correlation between the absolute dose predicted by our TPS and the measured dose. The CCC between ArcCHECK doses and TPS predictions on the CAX was found to be 0.9978. In gamma analysis of dose map, the mean passing rate was 98.53% for 3% dose difference and 3[[ce:hsp sp="0.25"/]]mm distance to agreement.

Conclusions

The VMAT patient specific QA with an ion chamber and ArcCHECK phantom are consistent with the TPS calculated dose. Statistically good agreement was observed between ArcCHECK measured and TPS calculated. Hence, it can be used for routine VMAT QA.

Abstract

Aim

The aim of this study is to evaluate performance of ArcCHECK diode array detector for the volumetric modulated arc therapy (VMAT) patient specific quality assurance (QA). VMAT patient specific QA results were correlated with ion chamber measurement. Dose response of the ArcCHECK detector was studied.

Background

VMAT delivery technique improves the dose distribution. It is complex in nature and requires proper QA before its clinical implementation. ArcCHECK is a novel three dimensional dosimetry system.

Materials and methods

Twelve retrospective VMAT plans were calculated on ArcCHECK phantom. Point dose and dose map were measured simultaneously with ion chamber (IC-15) and ArcCHECK diode array detector, respectively. These measurements were compared with their respective TPS calculated values.

Results

The ion chamber measurements are in good agreement with TPS calculated doses. Mean difference between them is 0.50% with standard deviation of 0.51%. Concordance correlation coefficient (CCC) obtained for ion chamber measurements is 0.9996. These results demonstrate a strong correlation between the absolute dose predicted by our TPS and the measured dose. The CCC between ArcCHECK doses and TPS predictions on the CAX was found to be 0.9978. In gamma analysis of dose map, the mean passing rate was 98.53% for 3% dose difference and 3[[ce:hsp sp="0.25"/]]mm distance to agreement.

Conclusions

The VMAT patient specific QA with an ion chamber and ArcCHECK phantom are consistent with the TPS calculated dose. Statistically good agreement was observed between ArcCHECK measured and TPS calculated. Hence, it can be used for routine VMAT QA.

Get Citation

Keywords

Quality assurance; VMAT; Diode array; ArcCHECK; Gamma

About this article
Title

Analyzing the performance of ArcCHECK diode array detector for VMAT plan

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 21, No 1 (2016)

Pages

50-56

Published online

2016-01-01

DOI

10.1016/j.rpor.2015.10.004

Bibliographic record

Rep Pract Oncol Radiother 2016;21(1):50-56.

Keywords

Quality assurance
VMAT
Diode array
ArcCHECK
Gamma

Authors

Rajesh Thiyagarajan
Arunai Nambiraj
Sujit Nath Sinha
Girigesh Yadav
Ashok Kumar
Vikraman Subramani
- Kothandaraman

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