Assessing residual motion for gated proton-beam radiotherapy.

Abstract:

:Gated radiation therapy is a promising method for improving the dose conformality of treatments to moving targets and reducing the total volume of irradiated tissue. Target motion is of particular concern in proton beam radiotherapy, due to the finite range of proton dose deposition in tissue. Gating allows one to reduce the extent of variation, due to respiration, of the radiological depth to target during treatment delivery. However, respiratory surrogates typically used for gating do not always accurately reflect the position of the internal target. For instance, a phase delay often exists between the internal motion and the motion of the surrogate. Another phenomenon, baseline drifting refers to a gradual change in the exhale position over time, which generally affects the external and internal markers differently. This study examines the influence of these two physiological phenomena on gated radiotherapy using an external surrogate.

journal_name

J Radiat Res

authors

Sharp GC,Lu HM,Trofimov A,Tang X,Jiang SB,Turcotte J,Gierga DP,Chen GT,Hong TS

doi

10.1269/jrr.48.a55

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

A55-9

eissn

0449-3060

issn

1349-9157

pii

JST.JSTAGE/jrr/48.A55

journal_volume

48 Suppl A

pub_type

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