Mr. Thomas S. Pheiffer Profile

Thomas S. Pheiffer

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Publications (11)

Proceedings Article | 12 March 2014 Paper

Registration of liver images to minimally invasive intraoperative surface and subsurface data

Yifei Wu, D. Rucker, Rebekah Conley, Thomas Pheiffer, Amber Simpson, Sunil Geevarghese, Michael Miga

Proceedings Volume 9036, 90360V (2014) https://doi.org/10.1117/12.2044250

KEYWORDS: Image registration, Data modeling, Liver, Laparoscopy, Natural surfaces, Surgery, Image segmentation, Tissues, Lawrencium, Computed tomography

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Proceedings Article | 12 March 2014 Paper

Image to physical space registration of supine breast MRI for image guided breast surgery

Rebekah Conley, Ingrid Meszoely, Thomas Pheiffer, Jared Weis, Thomas Yankeelov, Michael Miga

Proceedings Volume 9036, 90362N (2014) https://doi.org/10.1117/12.2043817

KEYWORDS: Breast, Tumors, Magnetic resonance imaging, Ultrasonography, Image registration, Surgery, Tissues, Clouds, Natural surfaces, Breast cancer

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Breast conservation therapy (BCT) is a desirable option for many women diagnosed with early stage breast cancer and involves a lumpectomy followed by radiotherapy. However, approximately 50% of eligible women will elect for mastectomy over BCT despite equal survival benefit (provided margins of excised tissue are cancer free) due to uncertainty in outcome with regards to complete excision of cancerous cells, risk of local recurrence, and cosmesis. Determining surgical margins intraoperatively is difficult and achieving negative margins is not as robust as it needs to be, resulting in high re-operation rates and often mastectomy. Magnetic resonance images (MRI) can provide detailed information about tumor margin extents, however diagnostic images are acquired in a fundamentally different patient presentation than that used in surgery. Therefore, the high quality diagnostic MRIs taken in the prone position with pendant breast are not optimal for use in surgical planning/guidance due to the drastic shape change between preoperative images and the common supine surgical position. This work proposes to investigate the value of supine MRI in an effort to localize tumors intraoperatively using image-guidance. Mock intraoperative setups (realistic patient positioning in non-sterile environment) and preoperative imaging data were collected from a patient scheduled for a lumpectomy. The mock intraoperative data included a tracked laser range scan of the patient's breast surface, tracked center points of MR visible fiducials on the patient's breast, and tracked B-mode ultrasound and strain images. The preoperative data included a supine MRI with visible fiducial markers. Fiducial markers localized in the MRI were rigidly registered to their mock intraoperative counterparts using an optically tracked stylus. The root mean square (RMS) fiducial registration error using the tracked markers was 3.4mm. Following registration, the average closest point distance between the MR generated surface nodes and the LRS point cloud was 1.76±0.502 mm.

Proceedings Article | 14 March 2013 Paper

Geometric reconstruction using tracked ultrasound strain imaging

Thomas Pheiffer, Amber Simpson, Janet Ondrake, Michael Miga

Proceedings Volume 8671, 86711E (2013) https://doi.org/10.1117/12.2008045

KEYWORDS: Ultrasonography, Tumors, Computed tomography, Tissues, Imaging systems, Image segmentation, Calibration, Surgery, Optical tracking, Image registration

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Proceedings Article | 14 March 2013 Paper

Phantom-based comparison of the accuracy of point clouds extracted from stereo cameras and laser range scanner

Ankur Kumar, Thomas Pheiffer, Amber Simpson, Reid Thompson, Michael Miga, Benoit Dawant

Proceedings Volume 8671, 867125 (2013) https://doi.org/10.1117/12.2008036

KEYWORDS: Clouds, Cameras, Microscopes, Calibration, Imaging systems, Brain, Neodymium, Stereoscopic cameras, 3D image processing, Video

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Proceedings Article | 8 March 2013 Paper

Nonrigid liver registration for image-guided surgery using partial surface data: a novel iterative approach

D. Caleb Rucker, Yifei Wu, Janet Ondrake, Thomas Pheiffer, Amber Simpson, Michael Miga

Proceedings Volume 8671, 86710B (2013) https://doi.org/10.1117/12.2007991

KEYWORDS: Data modeling, Liver, Natural surfaces, Image registration, Rigid registration, Computed tomography, Image-guided intervention, Lawrencium, Surgery, Detection and tracking algorithms

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Proceedings Article | 17 February 2012 Paper

Intraoperative brain tumor resection cavity characterization with conoscopic holography

Amber Simpson, Jessica Burgner, Ishita Chen, Thomas Pheiffer, Kay Sun, Reid Thompson, Robert Webster, Michael Miga

Proceedings Volume 8316, 831631 (2012) https://doi.org/10.1117/12.911926

KEYWORDS: Tumors, Brain, Holography, Lawrencium, Data acquisition, Mathematical modeling, 3D modeling, Signal to noise ratio, Neuroimaging, Tissues

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Proceedings Article | 17 February 2012 Paper

Utilizing ultrasound as a surface digitization tool in image guided liver surgery

Kristen Miller, Janet Ondrake, Thomas Pheiffer, Amber Simpson, Michael Miga

Proceedings Volume 8316, 83163D (2012) https://doi.org/10.1117/12.912373

KEYWORDS: Liver, Natural surfaces, Lawrencium, Surgery, Ultrasonography, Image-guided intervention, Transducers, Optical tracking, Gold, Clouds

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Proceedings Article | 17 February 2012 Paper

Initial study of breast tissue retraction toward image guided breast surgery

Michael Shannon, Ingrid Meszoely, Janet Ondrake, Thomas Pheiffer, Amber Simpson, Kay Sun, Michael Miga

Proceedings Volume 8316, 831621 (2012) https://doi.org/10.1117/12.912860

KEYWORDS: Surgery, Breast, Tissues, Lawrencium, Image-guided intervention, Natural surfaces, Tumors, Data modeling, Clouds, Medical imaging

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Proceedings Article | 17 February 2012 Paper

Tracked 3D ultrasound targeting with an active cannula

Philip Swaney, Jessica Burgner, Thomas Pheiffer, D. Caleb Rucker, Hunter Gilbert, Janet Ondrake, Amber Simpson, E. Clif Burdette, Michael Miga, Robert Webster

Proceedings Volume 8316, 83160R (2012) https://doi.org/10.1117/12.912021

KEYWORDS: Ultrasonography, Liver, Calibration, Tissues, Kinematics, Actuators, Optical tracking, 3D acquisition, Tumors, Robotics

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Proceedings Article | 2 March 2011 Paper

Development of a novel laser range scanner

Thomas Pheiffer, Brian Lennon, Amber Simpson, Michael Miga

Proceedings Volume 7964, 796424 (2011) https://doi.org/10.1117/12.878390

KEYWORDS: Lawrencium, Optical spheres, Cameras, Scanners, Clouds, Optical tracking, Charge-coupled devices, Laser range finders, Gold, Diodes

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Proceedings Article | 24 February 2010 Paper

Automatic generation of boundary conditions using Demons non-rigid image registration for use in 3D modality-independent elastography

Thomas Pheiffer, Jao Ou, Michael Miga

Proceedings Volume 7625, 76250D (2010) https://doi.org/10.1117/12.844556

KEYWORDS: Tumors, Tissues, Reconstruction algorithms, Image registration, Detection and tracking algorithms, Elastography, Breast, Magnetic resonance imaging, Breast cancer, Process modeling

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Showing 5 of 11 publications

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