open access

Vol 24, No 1 (2019)
Original research articles
Published online: 2019-01-01
Submitted: 2018-07-10
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Multi-institutional evaluation using the end-to-end test for implementation of dynamic techniques of radiation therapy in Thailand

Lalida Tuntipumiamorn, Puangpen Tangboonduangjit, Taweap Sanghangthum, Rattapol Rangseevijitprapa, Chirasak Khamfongkhruea, Thida Niyomthai, Boonrut Vuttiprasertpong, Supranee Supanant, Nongnuch Chatchaipaiboon, Porntip Iampongpaiboon, Pitchayut Nakkrasae, Tanwiwat Jaikuna
DOI: 10.1016/j.rpor.2018.11.005
·
Rep Pract Oncol Radiother 2019;24(1):124-132.

open access

Vol 24, No 1 (2019)
Original research articles
Published online: 2019-01-01
Submitted: 2018-07-10

Abstract

Aim

In this study, an accuracy survey of intensity-modulated radiation therapy (IMRT) and volumetric arc radiation therapy (VMAT) implementation in radiotherapy centers in Thailand was conducted.

Background

It is well recognized that there is a need for radiotherapy centers to evaluate the accuracy levels of their current practices, and use the related information to identify opportunities for future development.

Materials and methods

An end-to-end test using a CIRS thorax phantom was carried out at 8 participating centers. Based on each center's protocol for simulation and planning, linac-based IMRT or VMAT plans were generated following the IAEA (CRP E24017) guidelines. Point doses in the region of PTVs and OARs were obtained from 5 ionization chamber readings and the dose distribution from the radiochromic films. The global gamma indices of the measurement doses and the treatment planning system calculation doses were compared.

Results

The large majority of the RT centers (6/8) fulfilled the dosimetric goals, with the measured and calculated doses at the specification points agreeing within ±3% for PTV and ±5% for OARS. At 2 centers, TPS underestimated the lung doses by about 6% and spinal cord doses by 8%. The mean percentage gamma pass rates for the 8 centers were 98.29±0.67% (for the 3%/3mm criterion) and 96.72±0.84% (for the 2%/2mm criterion).

Conclusions

The 8 participating RT centers achieved a satisfactory quality level of IMRT/VMAT clinical implementation.

Abstract

Aim

In this study, an accuracy survey of intensity-modulated radiation therapy (IMRT) and volumetric arc radiation therapy (VMAT) implementation in radiotherapy centers in Thailand was conducted.

Background

It is well recognized that there is a need for radiotherapy centers to evaluate the accuracy levels of their current practices, and use the related information to identify opportunities for future development.

Materials and methods

An end-to-end test using a CIRS thorax phantom was carried out at 8 participating centers. Based on each center's protocol for simulation and planning, linac-based IMRT or VMAT plans were generated following the IAEA (CRP E24017) guidelines. Point doses in the region of PTVs and OARs were obtained from 5 ionization chamber readings and the dose distribution from the radiochromic films. The global gamma indices of the measurement doses and the treatment planning system calculation doses were compared.

Results

The large majority of the RT centers (6/8) fulfilled the dosimetric goals, with the measured and calculated doses at the specification points agreeing within ±3% for PTV and ±5% for OARS. At 2 centers, TPS underestimated the lung doses by about 6% and spinal cord doses by 8%. The mean percentage gamma pass rates for the 8 centers were 98.29±0.67% (for the 3%/3mm criterion) and 96.72±0.84% (for the 2%/2mm criterion).

Conclusions

The 8 participating RT centers achieved a satisfactory quality level of IMRT/VMAT clinical implementation.

Get Citation

Keywords

IMRT; VMAT; Quality assurance; Accuracy; End-to-end test

About this article
Title

Multi-institutional evaluation using the end-to-end test for implementation of dynamic techniques of radiation therapy in Thailand

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 24, No 1 (2019)

Pages

124-132

Published online

2019-01-01

DOI

10.1016/j.rpor.2018.11.005

Bibliographic record

Rep Pract Oncol Radiother 2019;24(1):124-132.

Keywords

IMRT
VMAT
Quality assurance
Accuracy
End-to-end test

Authors

Lalida Tuntipumiamorn
Puangpen Tangboonduangjit
Taweap Sanghangthum
Rattapol Rangseevijitprapa
Chirasak Khamfongkhruea
Thida Niyomthai
Boonrut Vuttiprasertpong
Supranee Supanant
Nongnuch Chatchaipaiboon
Porntip Iampongpaiboon
Pitchayut Nakkrasae
Tanwiwat Jaikuna

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