Abstract/Details

Image registration and hybrid volume reconstruction of bone anatomy using a statistical shape atlas


2009 2009

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Abstract (summary)

Recovery of three dimensional (3D) anatomical structures is a necessity in image-assisted surgery. Intra-operative x-ray images acquired with a C-arm are traditionally reconstructed in the surgeon's mind, based on his anatomical knowledge. This thesis studies an emerging method for x-ray based reconstruction, where a computational pre-operative anatomical model replaces the surgeon's knowledge. The model can be derived from a patient-specific CT scan or from a statistical database (an anatomical atlas). A registration (alignment) of the prior model and the observed x-rays recovers the 3D shape and radiodensity of the patient's anatomy. This knowledge is then combined with the x-rays to fill-in for missing intra-operative information and improve the quality of a CT-like cone-beam reconstruction. We name the process of registration and fusion between the x-ray and atlas modalities "hybrid reconstruction." Potentially, it can bring affordable and mobile 3D medical imaging to environments and organizations that could not use it before.

To accomplish this goal, the thesis presents the following research contributions. We developed an efficient visualization algorithm to create 2D projections of our atlas. The algorithm, used as a component in registration and subsequent reconstrution, is key for the practical use of the atlas. We present an assessment of the registration of atlas and x-rays. And we demonstrate how hybrid reconstruction reduces artifacts caused by missing or distorted information in conventional reconstruction, due to image truncation, limited scan trajectory, and errors in tracking the C-arm motion.

Importantly, we present results of both simulation and real x-ray data. The latter required development of calibration and scan protocols with a ubiquitous mobile C-arm, which is a minor yet important research contribution. Among our results are a 100X speedup in the rendering of atlas images with the new algorithm, compared with CPU computation, sub-millimetric accuracy of rigid registration in both simulation and x-ray experiments, about 2 mm mean error is deformable registration, low errors in simulated hybrid reconstruction, and successful hybrid reconstruction from x-rays fused with atlas projections.

Indexing (details)


Subject
Biomedical engineering;
Computer science
Classification
0541: Biomedical engineering
0984: Computer science
Identifier / keyword
Applied sciences; Anatomical models; Computational anatomy; Cone-beam reconstruction; Image-assisted surgery; Medical image registration; Visualization; X-ray image processing
Title
Image registration and hybrid volume reconstruction of bone anatomy using a statistical shape atlas
Author
Sadowsky, Ofri
Number of pages
344
Publication year
2009
Degree date
2009
School code
0098
Source
DAI-B 69/12, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549939245
Advisor
Taylor, Russell H.
University/institution
The Johns Hopkins University
University location
United States -- Maryland
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3339967
ProQuest document ID
304916136
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304916136
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