open access

Vol 13, No 3 (2008)
Untitled
Published online: 2008-05-01
Submitted: 2007-12-12
Get Citation

The evaluation of 3DRT and IMRT techniques in postoperative radiotherapy for thyroid medullary carcinoma

Dorota GABRYŚ, Iwona WESOŁOWSKA, Rafał SUWIŃSKI
DOI: 10.1016/S1507-1367(10)60002-8
·
Rep Pract Oncol Radiother 2008;13(3):126-129.

open access

Vol 13, No 3 (2008)
Untitled
Published online: 2008-05-01
Submitted: 2007-12-12

Abstract

Background

Radical surgical excision is the treatment of choice in all medullary thyroid carcinomas. External beam radiotherapy for medullary thyroid carcinoma is necessary in advanced cases. Unfortunately, a large volume of the head and neck region which has to be irradiated is close to critical structures such as the spinal cord, larynx, and parotid glands, which creates a challenge during radiotherapy planning.

Aim

The aim of the study is to compare IMRT and 3D plans of patients diagnosed with medullary thyroid carcinoma in terms of CTV coverage and normal tissue sparing.

Materials and Methods

A 46-year-old woman with medullary thyroid carcinoma, stage pT4a N1b M0, underwent radical resection, followed by adjuvant radiotherapy to a total dose 60 Gy to the clinical target volume (CTV). Three plans were generated to irradiate the thyroid bed and regional lymph nodes. Two intensity-modulated radiation therapy (IMRT) and three-dimensional conformal radiation therapy (3DRT) plans were compared in terms of CTV coverage and organ at risk sparing.

Results

Using the IMRT plans we achieved more homogeneous dose distribution with higher minimal dose and lower maximal dose in the target volume compared to 3DRT technique. Furthermore, mean and maximal dose to critical structures were lower when IMRT was applied compared to 3DRT.

Conclusions

IMRT results in improved dose distribution within CTV compared to 3DRT. With the IMRT plan it is also possible to reduce the dose to the organ at risk, especially the larynx, salivary glands and spinal cord.

Abstract

Background

Radical surgical excision is the treatment of choice in all medullary thyroid carcinomas. External beam radiotherapy for medullary thyroid carcinoma is necessary in advanced cases. Unfortunately, a large volume of the head and neck region which has to be irradiated is close to critical structures such as the spinal cord, larynx, and parotid glands, which creates a challenge during radiotherapy planning.

Aim

The aim of the study is to compare IMRT and 3D plans of patients diagnosed with medullary thyroid carcinoma in terms of CTV coverage and normal tissue sparing.

Materials and Methods

A 46-year-old woman with medullary thyroid carcinoma, stage pT4a N1b M0, underwent radical resection, followed by adjuvant radiotherapy to a total dose 60 Gy to the clinical target volume (CTV). Three plans were generated to irradiate the thyroid bed and regional lymph nodes. Two intensity-modulated radiation therapy (IMRT) and three-dimensional conformal radiation therapy (3DRT) plans were compared in terms of CTV coverage and organ at risk sparing.

Results

Using the IMRT plans we achieved more homogeneous dose distribution with higher minimal dose and lower maximal dose in the target volume compared to 3DRT technique. Furthermore, mean and maximal dose to critical structures were lower when IMRT was applied compared to 3DRT.

Conclusions

IMRT results in improved dose distribution within CTV compared to 3DRT. With the IMRT plan it is also possible to reduce the dose to the organ at risk, especially the larynx, salivary glands and spinal cord.

Get Citation

Keywords

medullary thyroid carcinoma; IMRT; 3DRT; postoperative radiotherapy

About this article
Title

The evaluation of 3DRT and IMRT techniques in postoperative radiotherapy for thyroid medullary carcinoma

Journal

Reports of Practical Oncology and Radiotherapy

Issue

Vol 13, No 3 (2008)

Pages

126-129

Published online

2008-05-01

DOI

10.1016/S1507-1367(10)60002-8

Bibliographic record

Rep Pract Oncol Radiother 2008;13(3):126-129.

Keywords

medullary thyroid carcinoma
IMRT
3DRT
postoperative radiotherapy

Authors

Dorota GABRYŚ
Iwona WESOŁOWSKA
Rafał SUWIŃSKI

Important: This website uses cookies. More >>

The cookies allow us to identify your computer and find out details about your last visit. They remembering whether you've visited the site before, so that you remain logged in - or to help us work out how many new website visitors we get each month. Most internet browsers accept cookies automatically, but you can change the settings of your browser to erase cookies or prevent automatic acceptance if you prefer.

By "Via Medica sp. z o.o." sp.k., ul. Świętokrzyska 73, 80–180 Gdańsk, Poland
tel.:+48 58 320 94 94, fax:+48 58 320 94 60, e-mail: journals@viamedica.pl