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Deformable planning CT to cone-beam CT image registration in head-and-neck cancer
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10.1118/1.3554647
/content/aapm/journal/medphys/38/4/10.1118/1.3554647
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/4/10.1118/1.3554647

Figures

Image of FIG. 1.
FIG. 1.

Flow chart of the multiresolution Demons algorithm to register planning CT images with respect to weekly CBCT images.

Image of FIG. 2.
FIG. 2.

Illustration of histogram matching in which the intensity histogram of one image set is adjusted to match the intensity histogram of the other image set.

Image of FIG. 3.
FIG. 3.

Results of histogram matching: (a) CBCT image slice, (b) corresponding planning CT image slice before histogram matching, and (c) planning CT image slice after histogram matching.

Image of FIG. 4.
FIG. 4.

Checkerboard display of CBCT and CT images before (left) and after (right) Demons registration. After registration, the two images match each other well.

Image of FIG. 5.
FIG. 5.

Anatomic targets used for TRE calculations (left column: Planning CT; middle column: CBCT; right column: Registered CT). The target points are shown as enlarged dots for illustration. Top row: Bony tissue targets. Bottom row: Soft tissue targets. tip of coronoid mandible process, tip of coronoid mandible process, external auditory canal, and external auditory canal.

Image of FIG. 6.
FIG. 6.

Registration accuracy as measured by the mean TRE value averaged over the 9 anatomical points in weekly CBCT images derived from 12 head-and-neck cancer patients. The TRE averages demonstrate registration accuracy near the level of voxel size

Image of FIG. 7.
FIG. 7.

TRE sorted by anatomical point for the 12 cases considered. Box-and-whisker plots represent the median TRE (horizontal line), the 25th and 75th percentiles (edges of the box), and total range (extent of whiskers) excluding outliers ( symbols), with outliers defined as greater than 1.5× interquartile range below the first or above the third quartile. The TRE averages demonstrate registration accuracy near the level of voxel size.

Tables

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TABLE I.

Volume overlap index for eight head-and-neck cases.

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/content/aapm/journal/medphys/38/4/10.1118/1.3554647
2011-03-23
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Deformable planning CT to cone-beam CT image registration in head-and-neck cancer
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/38/4/10.1118/1.3554647
10.1118/1.3554647
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