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A method to implement full six-degree target shift corrections for rigid body in image-guided radiotherapy
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10.1118/1.2138009
/content/aapm/journal/medphys/33/1/10.1118/1.2138009
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/1/10.1118/1.2138009

Figures

Image of FIG. 1.
FIG. 1.

Definitions of coordinate systems: (a) machine coordinate system, (b) patient coordinate system ( axis points out of the paper).

Image of FIG. 2.
FIG. 2.

Definitions of (a) gantry vector , (b) collimator vector , and (c) table vector .

Image of FIG. 3.
FIG. 3.

(1) Comparison of beam portals on DRRs between the planned beam and the setup treatment beam that were not corrected for the target shift in a phantom study. (a) Beam portal of the planned field 1; (ḇa) beam portal of the setup treatment field 1. (2) Comparison of beam portals on DRRs between the planned beam and the beam that were corrected for the target shift in all six degrees for field 1. (ḇb) Beam portal of the corrected treatment field 1. (3) Comparison of beam portals on DRRs between the planned beam and the beam that were only corrected for the isocenter shift for field 1. No rotational correction was done. (ḇc) Beam portal of the isocenter-corrected treatment field 1.

Image of FIG. 4.
FIG. 4.

Target DVH comparisons for the plan, the “treatment” with the full six-degree corrections, and the “treatment” with isocenter correction only.

Tables

Generic image for table
TABLE I.

Gantry, collimator, table, and iso-center information for the three planned beams used in the presented clinical case (IEC convention). The origin of the coordinate system was at the machine isocenter, and , , and axes were defined as in Fig. 1.

Generic image for table
TABLE II.

Derived gantry, collimator, table, and iso-center information for the three beams (IEC convention). With the derived beam parameters, the detected target shift should be fully (six degrees) corrected for. The origin of the coordinate system was at the machine isocenter, and , , and axes were defined as in Fig. 1.

Generic image for table
TABLE III.

(a) Dose comparisons at four corresponding locations between the plan and the “treatment” with the full six-degree correction. (b) Dose comparisons at four corresponding locations between the plan and the “treatment” with the isocenter correction only.

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/content/aapm/journal/medphys/33/1/10.1118/1.2138009
2005-12-19
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A method to implement full six-degree target shift corrections for rigid body in image-guided radiotherapy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/33/1/10.1118/1.2138009
10.1118/1.2138009
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