Dosimetric Effect of Type S Overlay Boards in Head and Neck Cases

This abstract has open access
Abstract Description
Abstract ID :
HAC800
Submission Type
Authors (including presenting author) :
Wong PW(1), Lee CH(1)
Affiliation :
Department of Medical Physics, Pamela Youde Nethersole Eastern Hospital
Introduction :
Immobilization devices are used in radiation therapy for reducing patient movement and reproducing treatment positions. As most of the immobilization devices are made of low density materials such as hollow carbon fiber tubes and the dosimetric effect was considered negligible, they are usually not included for dose calculation in treatment planning. In fact, high density materials are often added to reinforce some regions like edges or joints of an immobilization device.
Objectives :
The dosimetric effect from Type S overlay boards, used as an immobilization device in head and neck cases, was examined.
Methodology :
This study examine the effect of such device by comparing the differences in point doses and dose volume histograms (DVH) with and without a Type S overlay board using Eclipse treatment planning system.
Result & Outcome :
Some regions of the board showed significant attenuation of photon beams, the effect was minor on the dose volume histograms of a head and neck IMRT case but it might not be clinically negligible. In this study, we would also demonstrate a simple and fast procedure in Eclipse treatment planning system to include the immobilization device for dose calculation to compensate for the majority of the dosimetric effects.

Abstracts With Same Type

Abstract ID
Abstract Title
Abstract Topic
Submission Type
Primary Author
HAC720
Clinical Safety and Quality Service I
HA Staff
Maria SINN Dr
HAC456
Enhancing Partnership with Patients and Community
HA Staff
Donna TSE
HAC1262
Enhancing Partnership with Patients and Community
HA Staff
S F LEE Dr
HAC997
Clinical Safety and Quality Service II
HA Staff
K L CHAN
412 visits