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Ultrasound-fluoroscopy registration for prostate brachytherapy dosimetry.

Abstract：

:Prostate brachytherapy is a treatment for prostate cancer using radioactive seeds that are permanently implanted in the prostate. The treatment success depends on adequate coverage of the target gland with a therapeutic dose, while sparing the surrounding tissue. Since seed implantation is performed under transrectal ultrasound (TRUS) imaging, intraoperative localization of the seeds in ultrasound can provide physicians with dynamic dose assessment and plan modification. However, since all the seeds cannot be seen in the ultrasound images, registration between ultrasound and fluoroscopy is a practical solution for intraoperative dosimetry. In this manuscript, we introduce a new image-based nonrigid registration method that obviates the need for manual seed segmentation in TRUS images and compensates for the prostate displacement and deformation due to TRUS probe pressure. First, we filter the ultrasound images for subsequent registration using thresholding and Gaussian blurring. Second, a computationally efficient point-to-volume similarity metric, an affine transformation and an evolutionary optimizer are used in the registration loop. A phantom study showed final registration errors of 0.84 ± 0.45 mm compared to ground truth. In a study on data from 10 patients, the registration algorithm showed overall seed-to-seed errors of 1.7 ± 1.0 mm and 1.5 ± 0.9 mm for rigid and nonrigid registration methods, respectively, performed in approximately 30s per patient.

journal_name

Med Image Anal

journal_title

Medical image analysis

authors

Dehghan E,Lee J,Fallavollita P,Kuo N,Deguet A,Le Y,Clif Burdette E,Song DY,Prince JL,Fichtinger G

doi

10.1016/j.media.2012.06.001

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

1347-58

issue

7

eissn

1361-8415

issn

1361-8423

pii

S1361-8415(12)00081-3

journal_volume

16

pub_type

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