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Quantifying the gantry sag on linear accelerators and introducing an MLC-based compensation strategy
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10.1118/1.3697528
/content/aapm/journal/medphys/39/4/10.1118/1.3697528
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/4/10.1118/1.3697528

Figures

Image of FIG. 1.
FIG. 1.

Gantry sag at different gantry angles, measured on three linacs (A, B, and C). The collimator angle was fixed at either (a) 0° or (b) 90° during gantry rotation.

Image of FIG. 2.
FIG. 2.

Gantry sag at different gantry angles, measured three times on linac A: the first time (initial), 1 month later (repeat 1), and 6 months after the initial measurement (repeat 2). The collimator angle was fixed at either (a) 0° or (b) 90° during gantry rotation.

Image of FIG. 3.
FIG. 3.

Gantry sag at different gantry angles, measured on three linacs (A, B, and C) after a gantry angle-specific MLC leaf position compensation was applied. The collimator angle was 90°.

Image of FIG. 4.
FIG. 4.

Gantry sag caused small misalignments between the superior (S) or inferior (I) borders of a test radiation field when the gantry was moved from 0° (G = 0) to 180° (G = 180) on linac C. (a) Collimator angle 0°; (b) collimator angle 90°; (c) collimator angle 90° with MLC leaf position compensation.

Image of FIG. 5.
FIG. 5.

Transverse RFC wobble at different gantry angles, measured on three linacs (A, B, and C). The collimator angle was fixed at either (a) 0° or (b) 90° during gantry rotation.

Tables

Generic image for table
TABLE I.

Displacement of the superior or inferior border of the test radiation field on CR films when the gantry was moved from 0° to 180°.

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/content/aapm/journal/medphys/39/4/10.1118/1.3697528
2012-03-28
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quantifying the gantry sag on linear accelerators and introducing an MLC-based compensation strategy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/39/4/10.1118/1.3697528
10.1118/1.3697528
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