open access

Vol 23, No 5 (2018)
Original research articles
Published online: 2018-09-01
Submitted: 2017-09-25
Get Citation

Establishment of national diagnostic reference levels (DRLs) for radiotherapy localisation computer tomography of the head and neck

Celine Clerkin, Sinead Brennan, Laura M. Mullaney
DOI: 10.1016/j.rpor.2018.07.012
·
Rep Pract Oncol Radiother 2018;23(5):407-412.

open access

Vol 23, No 5 (2018)
Original research articles
Published online: 2018-09-01
Submitted: 2017-09-25

Abstract

Aim

The aim of this research is to establish if variation exists in the dose delivered for head and neck (HN) localisation computed tomography (CT) imaging in radiation therapy (RT); to propose a national diagnostic reference levels (DRLs) for this procedure and to make a comparison between the national DRL and a DRL of a European sample.

Background

CT has become an indispensable tool in radiotherapy (RT) treatment planning. It is a requirement of legislation in many countries that doses of ionising radiation for medical exposures be kept ‘As Low As Reasonably Achievable’. There are currently no dose guidelines for RT localisation CT of the HN.

Materials and methods

All RT departments in Ireland and a sample of European departments were surveyed. Dose data on CT dose length product (DLP); dose index volume (CTDIvol); current time product; tube voltage and scan length was acquired for ten average-sized HN patients from each department. DRLs were proposed for DLP and CTDIvol using the rounded 75th percentile of the distribution of the means.

Results

42% of Irish departments and one European department completed the survey. Significant variation was found in the mean DLP, CTDIvol and scan lengths across the Irish departments. The proposed Irish DRL is 882 mGy cm and 21 mGy and the European department DRL is 816 mGy cm and 21 mGy, for DLP and CTDIvol, respectively.

Conclusions

Variation exists in doses used for HN RT localisation CT. DRLs have been proposed for comparison purposes with the aim of dose optimisation.

Abstract

Aim

The aim of this research is to establish if variation exists in the dose delivered for head and neck (HN) localisation computed tomography (CT) imaging in radiation therapy (RT); to propose a national diagnostic reference levels (DRLs) for this procedure and to make a comparison between the national DRL and a DRL of a European sample.

Background

CT has become an indispensable tool in radiotherapy (RT) treatment planning. It is a requirement of legislation in many countries that doses of ionising radiation for medical exposures be kept ‘As Low As Reasonably Achievable’. There are currently no dose guidelines for RT localisation CT of the HN.

Materials and methods

All RT departments in Ireland and a sample of European departments were surveyed. Dose data on CT dose length product (DLP); dose index volume (CTDIvol); current time product; tube voltage and scan length was acquired for ten average-sized HN patients from each department. DRLs were proposed for DLP and CTDIvol using the rounded 75th percentile of the distribution of the means.

Results

42% of Irish departments and one European department completed the survey. Significant variation was found in the mean DLP, CTDIvol and scan lengths across the Irish departments. The proposed Irish DRL is 882 mGy cm and 21 mGy and the European department DRL is 816 mGy cm and 21 mGy, for DLP and CTDIvol, respectively.

Conclusions

Variation exists in doses used for HN RT localisation CT. DRLs have been proposed for comparison purposes with the aim of dose optimisation.

Get Citation

Keywords

Radiotherapy; CT localisation; Diagnostic reference levels; Head and neck

About this article
Title

Establishment of national diagnostic reference levels (DRLs) for radiotherapy localisation computer tomography of the head and neck

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 23, No 5 (2018)

Pages

407-412

Published online

2018-09-01

DOI

10.1016/j.rpor.2018.07.012

Bibliographic record

Rep Pract Oncol Radiother 2018;23(5):407-412.

Keywords

Radiotherapy
CT localisation
Diagnostic reference levels
Head and neck

Authors

Celine Clerkin
Sinead Brennan
Laura M. Mullaney

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