title: Image timing and detector performance of a matrix ion-chamber electronic portal imaging device.
abstract: Image timing and input/output characteristics of a Varian PortalVision matrix liquid ion-chamber electronic portal imaging device (EPID) used with a Varian CL2100C/D linear accelerator were investigated to examine the variation in image timing and detector performance with acquisition mode. Contrast-detail curves showed that the input/output results were indicative of the image quality variation with acquisition mode. Overall for this accelerator/EPID arrangement the 500 MU/min repetition rate gives the best image quality for the 6 MV and 18 MV acquisition modes.
authors.affiliation: Oncology Department, Auckland Hospital, New Zealand.
authors.forename: P B
authors.initials: PB
authors.lastname: Greer
mesh_terms: D004867:Equipment Design; D007091:Image Processing, Computer-Assisted; D019047:Phantoms, Imaging; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors