Epid Dosimetry

Journal Article · Thu May 05 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3576163· OSTI ID:21608096

Greer, Peter B ^[1]; Vial, Philip ^[2]

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1. Dept.Radiation Oncology, Calvary Mater Newcastle Hospital, Locked Bag 7, Hunter Region Mail Centre, Newcastle, NSW 2310 (Australia)
2. Dept Medical Physics, Liverpool and Macarthur Cancer Therapy Centre, Liverpool, NSW 2170 (Australia)

Electronic portal imaging devices (EPIDs) were introduced originally for patient position verification. The idea of using EPIDs for dosimetry was realised in the 1980s. Little was published on the topic until the mid 1990's, when the interest in EPIDs for dosimetry increased rapidly and continues to grow. The increasing research on EPID dosimetry coincided with the introduction of intensity modulated radiation therapy (IMRT). EPIDs are well suited to IMRT dosimetry because they are high resolution, two-dimensional (2D) digital detectors. They are also pre-existing on almost all modern linear accelerators. They generally show a linear response to increasing dose. Different types of EPIDs have been clinically implemented, and these have been described in several review papers. The current generation of commercially available EPIDs are indirect detection active matrix flat panel imagers, also known as amorphous silicon (a-Si) EPIDs. Disadvantages of a-Si EPIDs for dosimetry include non-water equivalent construction materials, and the energy sensitivity and optical scatter of the phosphor scintillators used to create optical signal from the megavoltage beam. This report discusses current knowledge regarding a-Si EPIDs for dosimetry.

• OSTI ID: 21608096
• Journal Information: AIP Conference Proceedings, Vol. 1345, Issue 1; Conference: SSD summer school on concepts and trends in medical radiation dosimetry, Wollongong (Australia), 15-18 Sep 2010; Other Information: DOI: 10.1063/1.3576163; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
DOSES
DOSIMETRY
LINEAR ACCELERATORS
MONTE CARLO METHOD
PATIENTS
PHOSPHORS
RADIATION DETECTORS
RADIOTHERAPY
RESOLUTION
SENSITIVITY
SILICON
TWO-DIMENSIONAL CALCULATIONS
ACCELERATORS
CALCULATION METHODS
ELEMENTS
MEASURING INSTRUMENTS
MEDICINE
NUCLEAR MEDICINE
RADIOLOGY
SEMIMETALS
THERAPY