Mr. William R. Warner Profile

William R. Warner

at Thayer School of Engineering at Dartmouth

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Author

Publications (10)

Proceedings Article | 29 March 2024 Poster + Paper

Large MRI specimen submersion phantom design

Haley Stoner, Keith Paulsen, Sohail Mirza, Xiaoyao Fan, Ryan Duke, Ross Warner

Proceedings Volume 12928, 129281Z (2024) https://doi.org/10.1117/12.3006481

KEYWORDS: Magnetic resonance imaging, Robotics, Design, 3D metrology, Surgery, 3D printing, Visualization, Minerals, Plastics, Water

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Ever since the early 1980s, surgical robotics/robot assisted surgeries have gained more of a foothold in modern treatments. The extra guidance/precision that surgical robotics have provided in operations has been indispensable. The next step for surgical robotics is MRI compatibility to provide close to real time intraoperative imaging for space constrained operations. The robotic component artifact influence over the region of surgical interest (ROSI) is to be mitigated for complications in addition to providing accurate guidance for the surgeon. This study defines a large MRI phantom design for specimen submersion to verify/quantify artifact generation from robotic components as well as provide a better visualization platform for robotic performance during preliminary testing and evaluation. The main topics of focus for the phantom design are fluid selection, phantom shape, phantom containment material, and 3D printed artifact measurement evaluation grids. The MRI scans were conducted using a 3T Magnetom Prisma MRI. Three scan types were selected: T1 weighted, T2 weighted, and SGE (spoiled gradient echo). The investigated phantom fluids were a solution of nickel chloride and sodium chloride (the ACR phantom, 10mM NiCl2 75mM NaCl), two salt doped distilled water (13g, 26g), and food grade mineral oil. The oil and ACR phantom outperformed the doped water with similar SNR/CNR returns (SGE: SNR/CNR 250/240/57, PIU 83/60/85). The phantom containment material was inconclusive due to motion artifact production and will be rerun with alternative fluid. The 3D printed artifact measurement grid was printed in PETG as a cost-effective substitute as PLA started warping the grid after extended water exposure (0.2mm). After N4 implementation, the image uniformity was determined through the ACR method while the SNR/CNR values were calculated in Fiji. The results illustrated the preferred environmental constraints according to the main topics: food grade mineral oil, cylindrical, motion artifact interference, and PETG 3D printed grid.

Proceedings Article | 29 March 2024 Poster + Paper

Simulation study of minimally invasive surgical scenes and their effect on hand-held stereovision driven level-wise registration techniques

Ryan Duke, Xiaoyao Fan, William Warner, Linton Evans, Songbai Ji, Sohail Mirza, Keith Paulsen

Proceedings Volume 12928, 129281T (2024) https://doi.org/10.1117/12.3006256

KEYWORDS: Image segmentation, Deformation, Data modeling, Spine, Data processing, Surgery, Rigid registration, Image registration, Image processing, Depth maps

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Proceedings Article | 29 March 2024 Poster + Paper

Smart line detection and histogram-based approach to robust freehand ultrasound calibration

William Warner, Xiaoyao Fan, Ryan Duke, Kristen Chen, Chengpei Li, Haley Stoner, Kirthi Bellamkonda, Linton Evans, Richard Powell, Sohail Mirza, Keith Paulsen

Proceedings Volume 12928, 1292825 (2024) https://doi.org/10.1117/12.3006728

KEYWORDS: Calibration, Ultrasonography, Histograms, Video, Navigation systems, Surgery, Data acquisition, Equipment, Tunable filters, Image filtering

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Proceedings Article | 13 March 2024 Poster + Paper

Evaluation of multiple fluorescent agents and intraoperative MRI in a novel pig glioma model for fluorescence guided neurosurgery

Caleb Kwon, Augustino Scorzo, Rendall Strawbridge, Ryan Duke, William Warner, Kristen Chen, Chengpei Li, Xiaoyao Fan, David Roberts, Keith Paulsen, Scott Davis

Proceedings Volume 12825, 128250E (2024) https://doi.org/10.1117/12.3005564

KEYWORDS: Fluorescence, Tumors, RGB color model, Animal model studies, Magnetic resonance imaging, Imaging systems, Resection, Contrast agents, Animals, Fluorophores

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Proceedings Article | 13 March 2024 Presentation + Paper

Comparing fluorescent contrast agents for fluorescence guided surgery using 3-D cryo-imaging

Augustino Scorzo, Caleb Kwon, Rendall Strawbridge, Ryan Duke, William Warner, Kristen Chen, Chengpei Li, Xiaoyao Fan, David Roberts, Keith Paulsen, Scott Davis

Proceedings Volume 12825, 1282504 (2024) https://doi.org/10.1117/12.3003221

KEYWORDS: Contrast agents, Fluorescence, Molecules, Animal model studies

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Proceedings Article | 3 April 2023 Presentation + Paper

SIFT-based cortical surface shift estimation for intraoperative image updating

Xiaoyao Fan, Kristen Chen, William Warner, Ryan Duke, Chen Li, Linton Evans, Keith Paulsen

Proceedings Volume 12466, 1246613 (2023) https://doi.org/10.1117/12.2654258

KEYWORDS: Image registration, Resection, Surgery, Optical flow, Image processing, Brain, Deformation, Tumors, Neuroimaging

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Proceedings Article | 3 April 2023 Presentation + Paper

Towards accounting for intraoperative spine motion: a simulation study of registration between stereovision surfaces

William Warner, Xiaoyao Fan, Ryan Duke, Kristen Chen, Haley Stoner, Chen Li, Shaoju Wu, Songbai Ji, Sohail Mirza, Keith Paulsen

Proceedings Volume 12466, 124661H (2023) https://doi.org/10.1117/12.2654396

KEYWORDS: Spine, Printed circuit board testing, Image registration, Surgery, Anatomy, Point clouds, Data acquisition, Computed tomography, MATLAB, Imaging systems

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Proceedings Article | 3 April 2023 Poster + Paper

Automated localization of mini-screw fiducials in spine CT scans

Ryan Duke, Xiaoyao Fan, William Warner, Steven Baltic, Kristen Chen, Linton Evans, Songbai Ji, Sohail Mirza, Keith Paulsen

Proceedings Volume 12466, 124662J (2023) https://doi.org/10.1117/12.2654221

KEYWORDS: Computed tomography, Image segmentation, Printed circuit board testing, Spine, Image registration, Image processing, Head, Deformation, Voxels, Metals

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Proceedings Article | 4 April 2022 Poster + Paper

Preoperative-to-interoperative shift in spine pose measured as change in lordosis Cobb angle and its effect on navigational accuracy

William Warner, Xiaoyao Fan, Ryan Duke, Tahsin Khan, Songbai Ji, Steven Baltic, Sohail Mirza, Keith Paulsen

Proceedings Volume 12034, 120342B (2022) https://doi.org/10.1117/12.2612600

KEYWORDS: Spine, Navigation systems, Image registration, Computed tomography, Image processing, Motion measurement, Image segmentation, Surgery, Imaging systems, Image acquisition

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Proceedings Article | 4 March 2022 Presentation + Paper

Whole-brain MR-registered cryo-imaging of a porcine-human glioma model to compare contrast agent biodistributions

B. Byrd, R. Duke, X. Fan, D. Wirth, P. Hoopes, W. Warner, R. Strawbridge, L. Evans, S. Davis, K. Paulsen

Proceedings Volume 11943, 1194303 (2022) https://doi.org/10.1117/12.2608252

KEYWORDS: Luminescence, Tumors, Magnetic resonance imaging, Brain, Image segmentation, Image registration, Tissues, Surgery, RGB color model, 3D image processing

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Showing 5 of 10 publications

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