open access

Vol 24, No 5 (2019)
Original research articles
Published online: 2019-09-01
Submitted: 2019-02-19
Get Citation

Validation of Dolphin dosimetry in three dimensional patient-specific quality assurance programme

Niyas Puzhakkal, Abdullah Kallikuzhiyil Kochunny, Dinesh Makuny, Arun Krishnan M.P, Ranjith C. Poyil, Vysakh Raveendran
DOI: 10.1016/j.rpor.2019.07.006
·
Rep Pract Oncol Radiother 2019;24(5):481-490.

open access

Vol 24, No 5 (2019)
Original research articles
Published online: 2019-09-01
Submitted: 2019-02-19

Abstract

Aim

The aim of this study is to commission and validate Dolphin-Compass dosimetry as a patient-specific Quality Assurance (QA) device.

Background

The advancement of radiation therapy in terms of highly conformal delivery techniques demands a novel method of patient-specific QA. Dolphin-Compass system is a dosimetry solution capable of doing different QA in radiation therapy.

Materials and methods

Dolphin, air-vented ionization detector array mounted on Versa-HD Linear Accelerator (LINAC) was used for measurements. The Compass is a dose computation algorithm which requires modelling of LINAC head similar to other Treatment Planning Systems (TPS). The dosimetry system was commissioned after measuring the required beam data. The validation was performed by comparison of treatment plans generated in Monaco TPS against the measurement data. Different types of simple, complex, static and dynamic radiation fields and highly conformal treatment plans of patients were used in this study.

Results

For all field sizes, point doses obtained from Dolphin-Compass dosimetry were in good agreement with the corresponding TPS calculated values in most of the regions, except the penumbra, outside field and at build-up depth. The results of gamma passing rates of measurements by using different Multi-leaf Collimator patterns and Intensity Modulated Radiation Therapy fluence were also found to be in good correlation with the corresponding TPS values.

Conclusions

The commissioning and validation of dosimetry was performed with the help of various fields, MLC patterns and complex treatment plans. The present study also evaluated the efficiency of the 3D dosimetry system for the QA of complex treatment plans.

Abstract

Aim

The aim of this study is to commission and validate Dolphin-Compass dosimetry as a patient-specific Quality Assurance (QA) device.

Background

The advancement of radiation therapy in terms of highly conformal delivery techniques demands a novel method of patient-specific QA. Dolphin-Compass system is a dosimetry solution capable of doing different QA in radiation therapy.

Materials and methods

Dolphin, air-vented ionization detector array mounted on Versa-HD Linear Accelerator (LINAC) was used for measurements. The Compass is a dose computation algorithm which requires modelling of LINAC head similar to other Treatment Planning Systems (TPS). The dosimetry system was commissioned after measuring the required beam data. The validation was performed by comparison of treatment plans generated in Monaco TPS against the measurement data. Different types of simple, complex, static and dynamic radiation fields and highly conformal treatment plans of patients were used in this study.

Results

For all field sizes, point doses obtained from Dolphin-Compass dosimetry were in good agreement with the corresponding TPS calculated values in most of the regions, except the penumbra, outside field and at build-up depth. The results of gamma passing rates of measurements by using different Multi-leaf Collimator patterns and Intensity Modulated Radiation Therapy fluence were also found to be in good correlation with the corresponding TPS values.

Conclusions

The commissioning and validation of dosimetry was performed with the help of various fields, MLC patterns and complex treatment plans. The present study also evaluated the efficiency of the 3D dosimetry system for the QA of complex treatment plans.

Get Citation

Keywords

Dolphin detector; Compass; QA; IMRT; Treatment plans

About this article
Title

Validation of Dolphin dosimetry in three dimensional patient-specific quality assurance programme

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 24, No 5 (2019)

Pages

481-490

Published online

2019-09-01

DOI

10.1016/j.rpor.2019.07.006

Bibliographic record

Rep Pract Oncol Radiother 2019;24(5):481-490.

Keywords

Dolphin detector
Compass
QA
IMRT
Treatment plans

Authors

Niyas Puzhakkal
Abdullah Kallikuzhiyil Kochunny
Dinesh Makuny
Arun Krishnan M.P
Ranjith C. Poyil
Vysakh Raveendran

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