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Accelerator beam data commissioning equipment and procedures: Report of the TG-106 of the Therapy Physics Committee of the AAPM
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Image of FIG. 1.
FIG. 1.

Depth dose data for a beam for (a) , (b) , and (c) fields using different detectors.

Image of FIG. 2.
FIG. 2.

Comparison of depth doses with good and bad chambers with correct and incorrect bias.

Image of FIG. 3.
FIG. 3.

Ratio of depth doses with positive and negative (±) polarity on various chambers.

Image of FIG. 4.
FIG. 4.

BNC, TNC, and components of the triaxial cable.

Image of FIG. 5.
FIG. 5.

Effect of cable length in radiation beam. The cables are of different types from various manufacturers.

Image of FIG. 6.
FIG. 6.

Sequential appearance of chamber and its reflection in water viewed from tank side. The correct position is when both images form a perfect circle.

Image of FIG. 7.
FIG. 7.

(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.

Image of FIG. 8.
FIG. 8.

Effect of gantry angle tilt on the profiles of a beam for field at depth.

Image of FIG. 9.
FIG. 9.

Impact of scanning speed on the quality of electron profile.

Image of FIG. 10.
FIG. 10.

Surface and buildup dose for field of a beam with various detectors. The actual surface dose is also marked by the arrow.

Image of FIG. 11.
FIG. 11.

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.

Image of FIG. 12.
FIG. 12.

Effect of water ripple on low energy electron beam depth dose.

Image of FIG. 13.
FIG. 13.

Effect of data smoothing on the 60° wedge profiles. Circles are drawn to show the effect of smoothing.


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(a) Typical commissioning measurements for photon beam data for each energy and wedge. (b) Typical commissioning measurements for electron beam data for each energy.

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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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Accelerator beam data commissioning equipment and procedures: Report of the TG-106 of the Therapy Physics Committee of the AAPM