Introduction of a novel dose saving acquisition mode for the PortalVision aS500 EPID to facilitate on-line patient setup verification

Vetterli, D; Riem, H; Aebersold, DM; Greiner, RH; Manser, P; Cossmann, P; Kemmerling, L; Born, EJ; Mini, R (2004). Introduction of a novel dose saving acquisition mode for the PortalVision aS500 EPID to facilitate on-line patient setup verification. Medical physics, 31(4), pp. 828-31. College Park, Md.: American Association of Physicists in Medicine AAPM 10.1118/1.1668391

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In external beam radiotherapy, electronic portal imaging becomes more and more an indispensable tool for the verification of the patient setup. For the safe clinical introduction of high dose conformal radiotherapy like intensity modulated radiation therapy, on-line patient setup verification is a prerequisite to ensure that the planned dosimetric coverage of the tumor volume is actually realized in the patient. Since the direction of setup fields often deviates from the direction of the treatment beams, extra dose is delivered to the patient during the acquisition of these portal images which may reach clinical relevance. The aim of this work was to develop a new acquisition mode for the PortalVision aS500 electronic portal imaging device from Varian Medical Systems that allows one to take portal images with reduced dose while keeping good image quality. The new acquisition mode, called RadMode, selectively enables and disables beam pulses during image acquisition allowing one to stop wasting valuable dose during the initial acquisition of "reset frames." Images of excellent quality can be taken with 1 MU only. This low dose per image facilitates daily setup verification with considerably reduced extra dose.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Radiation Oncology > Medical Radiation Physics
UniBE Contributor:	Vetterli, Daniel, Manser, Peter, Mini, Roberto
ISSN:	0094-2405
ISBN:	15125000
Publisher:	American Association of Physicists in Medicine AAPM
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 14:56
Last Modified:	05 Dec 2022 14:17
Publisher DOI:	10.1118/1.1668391
PubMed ID:	15125000
Web of Science ID:	000220898000016
URI:	https://boris.unibe.ch/id/eprint/24124 (FactScience: 47031)