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Optimization of couch translational corrections to compensate for rotational and deformable target deviations in image guided radiotherapy
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10.1118/1.2977532
/content/aapm/journal/medphys/35/10/10.1118/1.2977532
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/10/10.1118/1.2977532

Figures

Image of FIG. 1.
FIG. 1.

DVHs of PTV and CTV in the plan and the unoptimized CTV DVHs at the three treatments (F1, F2, and F3) for patient 1.

Image of FIG. 2.
FIG. 2.

(a) Comparison of an axial CBCT image with the corresponding axial plan CT image at fraction F1, F2, and F3 (patient 1). The image correspondence was established based on the fiducial markers. The deformity of the CTV from the planning CTV is evident at all of the three fractions. (b) Comparison of an axial CBCT image with the corresponding axial plan CT image at one treatment for patient 2. The deformity of the CTV from the planning CTV is also apparent.

Image of FIG. 3.
FIG. 3.

Comparisons of the CTV dose volume histogram at treatment fractions F1, F2, and F3 (patient 1): the marker-based dose coverage (corresponding to unoptimized table position), and the improved CTV dose coverage with the volume-based and dose-based optimizations, respectively. No dose-based optimized DVHs are presented for F1 and F3 because no further improvements were observed.

Image of FIG. 4.
FIG. 4.

Comparisons of the CTV dose volume histogram at F1, F2, and F3 (patient 1): the marker-based (corresponding to unoptimized table position) and the improved dose coverage with direct dose-based optimization.

Image of FIG. 5.
FIG. 5.

Comparisons of the CTV DVH for patients 2 and 3: between the marker-based and the volume-based optimization, and between the marker-based and the direct dose-based optimization.

Tables

Generic image for table
TABLE I.

CTV rotational magnitudes detected on the acquired CBCTs at treatments for the three patients.

Generic image for table
TABLE II.

Values of optimized table translational corrections after each of the optimization steps for the three patients.

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/content/aapm/journal/medphys/35/10/10.1118/1.2977532
2008-09-10
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optimization of couch translational corrections to compensate for rotational and deformable target deviations in image guided radiotherapy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/35/10/10.1118/1.2977532
10.1118/1.2977532
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