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Application of the gamma evaluation method in Gamma Knife film dosimetry
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10.1118/1.3641644
/content/aapm/journal/medphys/38/10/10.1118/1.3641644
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/10/10.1118/1.3641644

Figures

Image of FIG. 1.
FIG. 1.

Drawings of Leksell coordinates: the superior posterior right corner of the patient is the origin (0, 0, 0) and the center coordinate of the Leksell frame is (100, 100, 100). The x axis has a right to left direction, the y axis has a posterior to anterior direction, and the z axis has a cranial to caudal direction relative to the patient. [From Elekta AB, Online Reference Manual Leksell GammaPlan® 8.3 (Document number 1008129), Rev. 01, Copyright © 2008/06 by Elekta Instrument AB. Reprinted by permission of Elekta AB].

Image of FIG. 2.
FIG. 2.

Collimator sector configuration for the composite shot, which is a characteristic feature of GK PFX. The 4, 8, and 16 mm shots and blocked sectors were mixed.

Image of FIG. 3.
FIG. 3.

Dosimetric phantoms used for GK QA purpose and irradiation sample of the EBT2 film. (a) Old polystyrene phantom and phantom holder; (b) new solid water phantom and EBT2 film in the axial plane configuration; (c) in the coronal plane configuration; and (d) irradiation sample of Gafchromic EBT2 film.

Image of FIG. 4.
FIG. 4.

Optical density vs absolute dose curves of EBT2 film in the 0–10 Gy dose range for red, green, and blue channels.

Image of FIG. 5.
FIG. 5.

Comparison of isodose lines between planning dose distribution and film measurement in the axial plane. Solid lines are the 20, 50, and 80% isodose lines from the DICOM RT file. Dash lines are measured isodose lines.

Image of FIG. 6.
FIG. 6.

Comparison of the line profiles of four test plans and film measurements in the diagonal direction along the anterior-right to posterior-left side of the patient (top left to right bottom side in Fig. 5). The solid lines correspond to DICOM RT data and the dotted lines correspond to film measurement data.

Image of FIG. 7.
FIG. 7.

Gamma index map for 0.5 mm/0.5% tolerance criteria in the axial plane.

Image of FIG. 8.
FIG. 8.

Dose gamma index histogram in 5% isodose bins for 0.5 mm/0.5% and 0.3 mm/0.3% tolerance criteria in the axial plane.

Image of FIG. 9.
FIG. 9.

Dose pass rate histogram in 5% isodose bins for 0.5 mm/0.5% and 0.3 mm/0.3% tolerance criteria in the axial plane.

Tables

Generic image for table
TABLE I.

Pass rates of gamma evaluation within the 20 and 50% isodose lines using four evaluation criteria (2.0 mm/2.0%, 1.0 mm/1.0%, 0.5 mm/0.5%, and 0.3 mm/0.3%; units, %).

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/content/aapm/journal/medphys/38/10/10.1118/1.3641644
2011-09-27
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Application of the gamma evaluation method in Gamma Knife film dosimetry
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/10/10.1118/1.3641644
10.1118/1.3641644
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