The Electronic Portal Imaging System Siemens Beamview Plus ® Versus the Conventional Verification Films CEA-TVS ® and DuPont CQL-7 ®

Abstract

As data of EPIDS are digital, images can be postprocessed and enhanced in a wide variety of ways. Using this tool the electronic portal imaging device provides images that, in terms of visual image quality, are at least comparable to the two evaluated types of radiographic films and also have the added advantage that such images are stored and can be transferred electronically being presupposition for digital patient documentation.

Filmless Evaluation of the Mechanical Accuracy of the Isocenter in Stereotactic Radiotherapy

“…This flat panel was operated by the software COHERENCE Therapist Workspace (version 1.0.657, Siemens Medical Solutions). The second investigated portal imaging system was the BEAMVIEW PLUS ® TI (version 2.2, Siemens Medical Solutions) that is attached to the accelerator PRIMUS ® [11]. This portal imaging device contains a fluorescent intensifying screen viewed by a CCD camera.…”

“…Such alternative techniques are electronic portal imaging devices [1,3,5,7,11,20,23,35] or the digital luminescence radiography [2,4,13,16,17,32,37].…”

Third party EPID with IGRT capability retrofitted onto an existing medical linear accelerator

“…Beamview TI Plus® is based on target integration technology, making it capable of acquiring portal images with a very low number of Monitor Units. The Beamview Plus® electronic portal imaging device has been evaluated against conventional radiographic films and found to provide significantly "visible" or better images [31].…”

“…Additional software at an additional cost from another third party vendor is required to perform surrogate based IGRT image review and manipulation. Unlike conventional radiographic film, the metal phosphor plate used with this imaging system is reusable and no film processor is required; the quality of digital images from this system is comparable to conventional film images [31], but unlike amorphous silicon or camera-based systems, the imaging is not "real time," since cassettes must physically be manipulated before images are available for review.…”

Digitalization and Networking of Analog Simulators and Portal Images

“…Portal verification imaging [1,3,5,6,12] using the therapy equipment is required in radiotherapy but cobalt units have no electronic portal imaging devices. The solution may be based on screen-film techniques [6-8, 10, 11, 14] or on digital luminescence radiography [2,4,9,10,12,16].…”