Depth dose data for a beam for (a) , (b) , and (c) fields using different detectors.
Comparison of depth doses with good and bad chambers with correct and incorrect bias.
Ratio of depth doses with positive and negative (±) polarity on various chambers.
BNC, TNC, and components of the triaxial cable.
Effect of cable length in radiation beam. The cables are of different types from various manufacturers.
Sequential appearance of chamber and its reflection in water viewed from tank side. The correct position is when both images form a perfect circle.
(a) Beam profiles of a beam at different depths with scanning arm tilt for a field, (b) electron beam profiles at depth of 80% depth dose for cone with gantry tilt. Arrows and circle are shown to represent the impact of arm and gantry tilt.
Effect of gantry angle tilt on the profiles of a beam for field at depth.
Impact of scanning speed on the quality of electron profile.
Surface and buildup dose for field of a beam with various detectors. The actual surface dose is also marked by the arrow.
Effect of chamber orientation on photon beam profiles for a fields: (a) long axis scan, (b) short axis scan with various size detectors. Only half scans are shown.
Effect of water ripple on low energy electron beam depth dose.
Effect of data smoothing on the 60° wedge profiles. Circles are drawn to show the effect of smoothing.
(a) Typical commissioning measurements for photon beam data for each energy and wedge. (b) Typical commissioning measurements for electron beam data for each energy.
Physical characteristics of commerically avialable water equivalent materilas. NA: Nuclear Associates, NY; Radiation Product Design, Albertsville, MN; RMI. Radiation Measurements, Inc., Middleton, WI; CIRS: Computerized Imaging Reference Systems, Inc. Norfolk, VA.
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