@conference {Ghanavati2010, title = {Multi-Slice to Volume Registration of Ultrasound Data to a Statistical Atlas of Human Pelvis}, booktitle = {SPIE Medical Imaging}, series = {Visualization, Image-Guided Procedures, and Modeling}, volume = {7625}, year = {2010}, month = {23 February 2010}, pages = {76250O-1 {\textendash} 76250O-10}, publisher = {SPIE Digital Library}, organization = {SPIE Digital Library}, address = {San Diego, California, USA}, abstract = {

Identifying the proper orientation of the pelvis is a critical step in accurate placement of the femur prosthesis in the acetabulum in Total Hip Replacement (THR) surgeries. The general approach to localize the orientation of the pelvis coordinate system is to use X-ray fluoroscopy to guide the procedure. An alternative can be employing intra-operative ultrasound (US) imaging with pre-operative CT scan or fluoroscopy imaging. In this paper, we propose to replace the need of pre-operative imaging by using a statistical shape model of the pelvis, constructed from several CT images. We then propose an automatic deformable intensity-based registration of the anatomical atlas to a sparse set of 2D ultrasound images of the pelvis in order to localize its anatomical coordinate system. In this registration technique, we first extract a set of 2D slices from a single instance of the pelvic atlas. Each individual 2D slice is generated based on the location of a corresponding 2D ultrasound image. Next, we create simulated ultrasound images out of the 2D atlas slices and calculate a similarity metric between the simulated images and the actual ultrasound images. The similarity metric guides an optimizer to generate an instance of the atlas that best matches the ultrasound data. We demonstrated the feasibility of our proposed approach on two male human cadaver data. The registration was able to localize a patient-specific pelvic coordinate system with origin translation error of 2 mm and 3.45 mm, and average axes rotation error of 3.5 degrees and 3.9 degrees for the two cadavers, respectively.

}, keywords = {Deformable registration, Freehand ultrasound, Intensity-based registration, Pelvis., Statistical anatomical atlas, Total Hip Replacement}, doi = {10.1117/12.844080}, url = {http://spiedl.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PSISDG00762500000176250O000001\&idtype=cvips\&gifs=yes}, author = {Sugantha Ganapathy and Parvin Mousavi and Gabor Fichtinger and Pezhman Foroughi and Purang Abolmaesumi} } @conference {Foroughi2009, title = {Multi-modality fusion of CT and 3D ultrasound and tracked strain images for breast irradiation planning}, booktitle = {SPIE Medical Imaging 2009: Ultrasonic Imaging and Signal Processing}, volume = {7265}, number = {72651B}, year = {2009}, author = {Pezhman Foroughi and Csaba Csoma and Hassan Rivaz and Gabor Fichtinger and Richard Zellars and Gregory D. Hager and Emad Boctor} } @conference {Foroughi2008b, title = {Automatic initialization for 3D bone registration}, booktitle = {Medical Imaging 2008: Visualization, Image-guided Procedures, and Modeling}, volume = {6918}, number = {1}, year = {2008}, pages = {69182P}, publisher = {SPIE}, organization = {SPIE}, doi = {10 1117/12 772632}, url = {http://link aip org/link/?PSI/6918/69182P/1}, author = {Pezhman Foroughi and Russell H. Taylor and Gabor Fichtinger}, editor = {Michael I. Miga and Kevin Cleary} } @article {Foroughi2008, title = {Localization of pelvic anatomical coordinate system using US/atlas registration for total hip replacement}, journal = {Medical image computing and computer-assisted intervention (MICCAI)}, volume = {11}, number = {Pt 2}, year = {2008}, pages = {871{\textendash}879}, publisher = {Johns Hopkins University, Baltimore, MD, USA pezhman@cs jhu edu}, abstract = {

In Total Hip Replacement (THR) procedures, misalignment of the acetabular component can lead to dislocation, impingement For the successful alignment of acetabular component, precise estimation of pelvic anatomical coordinate system is necessary Conventional navigation systems use CT scan or fluoroscopy, or involve implanted bone fiducials or invasive probing of bony landmarks to locate the anatomical coordinate In this paper, an ultrasound-based approach is proposed that exploits prior knowledge about the anatomy of the pelvis in the form of a 3D surface atlas Tracked ultrasound images are utilized to extract sample points from the surface of the pelvis A generic coordinate system in the specific patient is localized by registering these points to a statistical atlas of the pelvis in which a canonical anatomical coordinate system had been defined This technique has been evaluated using simulation, dry bone, and cadaver experiments, was able to localize the anatomical coordinate system with the accuracy of about 1 degree

}, keywords = {Algorithms, Arthroplasty, Automated, Computer-Assisted, Hip, Hip Joint, Humans, Image Enhancement, Image Interpretation, Imaging, methods, Pattern Recognition, Pelvic Bones, Replacement, Reproducibility of Results, Sensitivity, Specificity, Subtraction Technique, Surgery, surgery/ultrasonography, Three-Dimensional, Ultrasonography}, author = {Pezhman Foroughi and Danny Y Song and Gouthami Chintalapani and Russell H. Taylor and Gabor Fichtinger} } @conference {Foroughi2008a, title = {Ultrasound Based Localization of Pelvic Anatomical Coordinate System}, booktitle = {8th Annual Meeting of Computer Assisted Orthopedic Surgery International (CAOS)}, year = {2008}, pages = {81-83}, author = {Pezhman Foroughi and Danny Y Song and Russell H. Taylor and Gabor Fichtinger} } @article {Rivaz2008a, title = {Ultrasound elastography: a dynamic programming approach}, journal = {IEEE transactions on medical imaging}, volume = {27}, number = {10}, year = {2008}, month = {Oct}, pages = {1373{\textendash}1377}, publisher = {Engineering Research Center for Computer Integrated Surgery, Johns Hopkins University, 3400 N Charles Street, Baltimore, MD 21218, USA}, abstract = {

This paper introduces a 2-D strain imaging technique based on minimizing a cost function using dynamic programming (DP) The cost function incorporates similarity of echo amplitudes, displacement continuity Since tissue deformations are smooth, the incorporation of the smoothness into the cost function results in reduced decorrelation noise As a result, the method generates high-quality strain images of freehand palpation elastography with up to 10\% compression, showing that the method is more robust to signal decorrelation (caused by scatterer motion in high axial compression, nonaxial motions of the probe) in comparison to the standard correlation techniques The method operates in less than 1 s, is thus also potentially suitable for real time elastography

}, keywords = {Algorithms, Computer-Assisted, Elasticity Imaging Techniques, Humans, Image Enhancement, Image Interpretation, Imaging, instrumentation/methods, methods, Numerical Analysis, Phantoms, Sensitivity, Specificity}, doi = {10 1109/TMI 2008 917243}, url = {http://dx doi org/10 1109/TMI 2008 917243}, author = {Hassan Rivaz and Emad Boctor and Pezhman Foroughi and Richard Zellars and Gabor Fichtinger and Gregory D. Hager} } @conference {Foroughi2007, title = {P6D-2 Ultrasound Bone Segmentation Using Dynamic Programming}, booktitle = {Procedings IEEE Ultrasonics Symposium}, year = {2007}, month = {28{\textendash}31 Oct}, pages = {2523{\textendash}2526}, doi = {10 1109/ULTSYM 2007 635}, author = {Pezhman Foroughi and Emad Boctor and Michael Swartz and Russell H. Taylor and Gabor Fichtinger} } @conference {Rivaz2007b, title = {Toward Real-Time 2d Ultrasound Elastography Using Global Optimization Of A Regularized Displacement Field}, booktitle = {Sixth International Conference on the Ultrasonic Measurement and Imaging of Tissue Elasticity}, year = {2007}, author = {Hassan Rivaz and Pezhman Foroughi and Emad Boctor and Richard Zellars and Gabor Fichtinger and Gregory D. Hager} } @conference {Rivaz2007c, title = {Ultrasound Elastography: a Dynamic Programming Approach}, booktitle = {Workshop to the 10th MICCAI Conference}, year = {2007}, author = {Hassan Rivaz and Pezhman Foroughi and Emad Boctor and Richard Zellars and Gabor Fichtinger and Gregory D. Hager} }