Journal ArticleDOI
Two-film brachytherapy reconstruction algorithm.
Robert L. Siddon,Lee M. Chin +1 more
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TLDR
A new isocentric two-film reconstruction algorithm for brachytherapy seed and needle implants that has no requirements that the two films be orthogonal, symmetric, or even be taken in a transverse plane is developed.Abstract:
We have developed a new isocentric two‐film reconstruction algorithm for brachytherapy seed and needle implants. The algorithm has no requirements that the two films be orthogonal, symmetric, or even be taken in a transverse plane. In addition, there is no requirement that the two films even have the same number of images. We have found removal of these usual constraints useful for head and neck implants where images are often obscured by patient anatomy. The inherent image matching ambiguities associated with traditional two‐film techniques are minimized by considering the image end points, rather than just the image centroids. For two films, the new algorithm, which considers all image combinations at o n e time, matches all the end‐point images on one film with those on the other, and then reconstructs the end‐point positions of the seeds. The algorithm minimizes the difference between the actual images and the projected images from the reconstructed seeds. The new two‐film image matching problem is shown to be equivalent to the well‐known assignment problem. For an implant of N seeds, this equivalence allows the two‐film problem to be solved by an algorithm (ACM algorithm 548) that scales with a polynomial power of N, rather than N! as is usually assumed. An implant of N seeds can be matched and reconstructed in approximately (N/20)2 s on a VAX 11/780.read more
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Journal ArticleDOI
Polymer gel dosimetry
Clive Baldock,Y De Deene,Simon J. Doran,Geoffrey S. Ibbott,Andrew Jirasek,Martin Lepage,Kim B. McAuley,Mark Oldham,L John Schreiner +8 more
TL;DR: 3D radiation dose distribution in polymer gel dosimeters may be imaged using magnetic resonance imaging (MRI), optical-computerized tomography (optical-CT), x-ray CT or ultrasound, and clinical dosimetry applications of polymer gel Dosimetry are presented.
Journal ArticleDOI
The american brachytherapy society recommendations for permanent prostate brachytherapy postimplant dosimetric analysis
TL;DR: It is essential that postimplant dosimetry should be performed on all patients undergoing permanent prostate brachytherapy and guidelines were established for the performance and analysis of such Dosimetry.
PatentDOI
Intraoperative dynamic dosimetry for prostate implants
TL;DR: Analytical tools in support of a paradigm shift in brachytherapy treatment planning for prostate cancer--a shift from standard pre-planning to intraoperative planning using dosimetric feedback based on the actual deposited seed positions within the prostate are described.
Journal ArticleDOI
Stereotaxic localization of intracranial targets.
Robert L. Siddon,Norman H. Barth +1 more
TL;DR: This work reports on a useful clinical method for precisely locating intracranial targets using the BRW system, currently used in stereotaxic irradiation of arteriovenous malformations.
Journal ArticleDOI
Matching and reconstruction of brachytherapy seeds using the Hungarian algorithm (MARSHAL).
Ameet Kumar Jain,Yu Zhou,Tabish Mustufa,E. Clif Burdette,Gregory S. Chirikjian,Gabor Fichtinger +5 more
TL;DR: It is proved that two images are insufficient to correctly match the seeds, while a third image renders the matching problem to be of nonpolynomial complexity, and a pseudopolynomial time algorithm is proposed, sufficiently generic to provide a practical solution to any correspondence problem, across different imaging modalities and features.
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