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Dosimetric characterization of a multileaf collimator for a new four-dimensional image-guided radiotherapy system with a gimbaled x-ray head, MHI-TM2000a)
a)Conflicts of interest: This research was sponsored in part by Mitsubishi Heavy Industries, Ltd., Japan. Kenji Takayama has a research contract with Mitsubishi Heavy Industries, Ltd., Japan. Takashi Mizowaki, Masaki Kokubo, and Masahiro Hiraoka have consultancy agreement with Mitsubishi Heavy Industries, Ltd., Japan.
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10.1118/1.3480510
/content/aapm/journal/medphys/37/9/10.1118/1.3480510
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/9/10.1118/1.3480510

Figures

Image of FIG. 1.
FIG. 1.

(a) Geometric scheme of the x-ray head and MLC components. Schematic drawings of the MLC from (b) the front and (c) the side.

Image of FIG. 2.
FIG. 2.

Definition of pan and tilt coordinate system. (a) Pan rotation and (b) tilt rotation.

Image of FIG. 3.
FIG. 3.

A custom-made jig for leaf position accuracy verification.

Image of FIG. 4.
FIG. 4.

Leaf position accuracy testing film at the gantry angle of 90° with a pan rotational angle of 2.5°. The black dotted lines, perpendicular to match lines, show the leaf positions of −57.5, −27.5, 2.5, 32.5, and 62.5 mm. White dotted lines connected opposed small pinholes, indicating that the middle match line was parallel to the in-plane direction.

Image of FIG. 5.
FIG. 5.

An example of dose profiles in the LR and HF directions for the maximum field size of .

Image of FIG. 6.
FIG. 6.

A simplified geometric model with a tilt rotational angle of .

Image of FIG. 7.
FIG. 7.

Intra- and interleaf leakage for the MLC for MHI-TM2000. (a) Leakage testing film. (b) Cross-leaf dose profiles along the dashed line in (a).

Image of FIG. 8.
FIG. 8.

Tongue-and-groove effect on the MLC for MHI-TM2000. (a) Tongue-and-groove effect on testing film. (b) Cross-leaf dose profiles along the dashed line in (a).

Tables

Generic image for table
TABLE I.

Field characteristics without the pan and tilt rotations. Abbreviations: ; .

Generic image for table
TABLE II.

Field characteristics for nominal field size of at the maximum pan or tilt rotational angle of 2.5°. Abbreviations: ; .

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/content/aapm/journal/medphys/37/9/10.1118/1.3480510
2010-08-16
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dosimetric characterization of a multileaf collimator for a new four-dimensional image-guided radiotherapy system with a gimbaled x-ray head, MHI-TM2000a)
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/37/9/10.1118/1.3480510
10.1118/1.3480510
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