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Multiscale registration of planning CT and daily cone beam CT images for adaptive radiation therapy
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10.1118/1.3026602
/content/aapm/journal/medphys/36/1/10.1118/1.3026602
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/1/10.1118/1.3026602

Figures

Image of FIG. 1.
FIG. 1.

Step 1 of the multiscale registration algorithm: decompose each of the images to be registered into hierarchical scales.

Image of FIG. 2.
FIG. 2.

Step 2 of the multiscale registration algorithm: register the coarse scales using a landmark-based registration algorithm.

Image of FIG. 3.
FIG. 3.

Step 3 of the multiscale registration algorithm: iteratively register the scales with one another, at each stage using the previous scale transformation as the starting point for the new registration procedure.

Image of FIG. 4.
FIG. 4.

The original and noisy deformed CT images of the rectum.

Image of FIG. 5.
FIG. 5.

The translation, translation, and rotation angle deformation parameters obtained upon registering the noisy deformed rectum images with the CT images using the multiscale registration algorithm.

Image of FIG. 6.
FIG. 6.

The deformation field illustrating the known vector deformation between the original rectum CT image and the noisy deformed image. The magnitude of the vector deformation ranges from .

Image of FIG. 7.
FIG. 7.

Rectum example. Planning CT image (upper left), daily CBCT image (upper right), checkerboard comparison after ordinary B-splines deformable registration (lower left), checkerboard comparison after multiscale registration (lower right). The arrows indicate examples of areas of misalignment between the images after ordinary registration.

Image of FIG. 8.
FIG. 8.

Head and neck example. Planning CT image (upper left), daily CBCT image (upper right), checkerboard comparison after ordinary B-splines deformable registration (lower left), checkerboard comparison after multiscale registration (lower right). The arrows indicate examples of areas of misalignment between the images after ordinary registration.

Image of FIG. 9.
FIG. 9.

Prostate example. Planning CT image (upper left), daily CBCT image (upper right), checkerboard comparison after ordinary B-splines deformable registration (lower left), checkerboard comparison after multiscale registration (lower right). The arrows indicate examples of areas of misalignment between the images after ordinary registration.

Image of FIG. 10.
FIG. 10.

The mutual information similarity measures between the rectum planning CTs and daily CBCTs before registration, after B-splines deformable registration, and after multiscale registration.

Tables

Generic image for table
TABLE I.

The mean, median, minimum, and maximum MADs between the computed and known vector deformation fields. The first column contains the MADs obtained upon using the multiscale registration algorithm to register the CT images with the non-noisy deformed images; the second column contains the MADs obtained upon using the multiscale registration algorithm to register the CT images with the noisy deformed images; the third column contains the MADs obtained upon using a standard B-splines deformable registration algorithm to register the CT images with the non-noisy deformed images.

Generic image for table
TABLE II.

The mean mutual information between the planning CTs and daily CBCTs before registration, after B-splines deformable registration, and after multiscale registration.

Generic image for table
TABLE III.

The mutual information similarity measures between the three-dimensional planning CT volumes and daily CBCT volumes before registration, after B-splines deformable registration, and after multiscale registration.

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/content/aapm/journal/medphys/36/1/10.1118/1.3026602
2008-12-04
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multiscale registration of planning CT and daily cone beam CT images for adaptive radiation therapy
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/36/1/10.1118/1.3026602
10.1118/1.3026602
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