Prof. Elvis C.S. Chen Profile

Prof. Elvis C.S. Chen

Assistant Professor at Western Univ

Area of Expertise:

Image-Guided Intervention , Registration , Computer Assisted Orthopaedics Surgery , Calibration

Publications (41)

Proceedings Article | 29 March 2024 Presentation + Paper

Physical replication and validation of mathematical mitral valve models

Patrick Carnahan, Charles C. Yuan, John Moore, Gianluigi Bisleri, Daniel Bainbridge, Terry Peters, Elvis C. Chen

Proceedings Volume 12928, 1292807 (2024) https://doi.org/10.1117/12.3006494

KEYWORDS: Mathematical modeling, Education and training, 3D modeling, Heart, Modeling, Doppler effect, Computer simulations, Silicon

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Proceedings Article | 3 April 2023 Presentation + Paper

Open source video-based hand-eye calibration

Tara Kemper, Daniel Allen, Adam Rankin, Terry Peters, Elvis C. Chen

Proceedings Volume 12466, 1246606 (2023) https://doi.org/10.1117/12.2651160

KEYWORDS: Calibration, Cameras, Optical tracking, Matrices, 3D image processing, Video, Imaging systems, Image segmentation, Data acquisition, 3D tracking

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Proceedings Article | 3 April 2023 Presentation + Paper

An open-source 3D Slicer module for fluoro-free transcatheter vessel navigation

Hareem Nisar, Patrick Carnahan, Daniel Bainbridge, Elvis C. Chen, Terry Peters

Proceedings Volume 12466, 1246616 (2023) https://doi.org/10.1117/12.2653969

KEYWORDS: Image segmentation, Ice, 3D tracking, 3D image processing, Ultrasonography, In vivo imaging, Calibration, Magnetic tracking, 3D modeling, 3D image reconstruction

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Proceedings Article | 3 April 2023 Presentation + Paper

Towards virtual displays in the interventional radiology suite: a feasibility study

Daniel Allen, Nadia Cattari, Joeana Cambranis, Terry Peters, Elvis C. Chen

Proceedings Volume 12466, 124661A (2023) https://doi.org/10.1117/12.2654267

KEYWORDS: Visualization, Augmented reality, Liver, Image-guided intervention, Virtual reality, Image quality, Ablation, Light sources and illumination

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Proceedings Article | 3 April 2023 Poster + Paper

Real-time mitral annulus segmentation from 4D transesophageal echocardiography using deep learning regression

Patrick Carnahan, Apurva Bharucha, Mehdi Eskandari, Daniel Bainbridge, Elvis C. Chen, Terry Peters

Proceedings Volume 12464, 124641X (2023) https://doi.org/10.1117/12.2653618

KEYWORDS: Image segmentation, Data modeling, Fourier transforms, Deep learning, Echocardiography, Ultrasonography, 3D modeling, Network architectures, Image registration

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Proceedings Article | 4 April 2022 Poster + Paper

The automatic localization of the vena contracta using Intracardiac Echocardiography (ICE): a feasibility study

Djalal Fakim, Hareem Nisar, John Moore, Terry Peters, Elvis C. Chen

Proceedings Volume 12034, 1203421 (2022) https://doi.org/10.1117/12.2610813

KEYWORDS: Image segmentation, Visualization, Image processing, Doppler effect, Algorithm development, Echocardiography, Ultrasonography, Silicon, Imaging systems, Therapeutics

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Proceedings Article | 4 April 2022 Presentation + Paper

Intra-procedural evaluation of tumor coverage using 3D US images for percutaneous focal liver thermal ablation

Shuwei Xing, Joeana Cambranis Romero, Derek Cool, Amol Mujoomdar, Leandro Cardarelli Leite, Elvis C. Chen, Terry Peters, Aaron Fenster

Proceedings Volume 12034, 120340P (2022) https://doi.org/10.1117/12.2611864

KEYWORDS: Tumors, 3D image processing, Liver, Safety, Tissues, Visualization, Visibility, Radiofrequency ablation, Medical research, Clinical trials

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Proceedings Article | 4 April 2022 Poster + Presentation + Paper

A co-calibration framework for the accuracy assessment of vision-based tracking systems

Daniel Allen, Terry Peters, Elvis C. S. Chen

Proceedings Volume 12034, 120342J (2022) https://doi.org/10.1117/12.2606815

KEYWORDS: Cameras, Calibration, Optical tracking, Visual process modeling, Augmented reality, 3D modeling, Image segmentation, RGB color model, Image registration, Head-mounted displays

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Advancements in Head-Mounted-Display (HMD) technology have led to an increasing focus in the development of Augmented Reality (AR) applications in the image-guided surgery field. These applications are often enabled by third-party vision-based tracking techniques, allowing virtual models to be registered to their corresponding real-world objects. The accuracy of the underlying vision-based tracking technique is critical towards the efficacy of these systems, and must be thoroughly evaluated before integration into clinical practice. In this paper, we propose a framework for the purpose of evaluating the technical accuracy of the HMD’s intrinsic vision-based tracking techniques using an extrinsic tracking system as ground truth. Specifically, we assess the tracking accuracy of the Vuforia Augmented Reality Software Development Kit, a vision-based tracking technique commonly used in conjunction with the Microsoft Hololens 2, against a commercial optical tracking system using a co calibration apparatus. The framework follows a two-stage pipeline of first calibrating the cameras with respect to the optical tracker (hand-eye calibration), and then calibrating a Vuforia target to the optical tracker using a custom calibration apparatus. We then evaluate the absolute tracking accuracy of three Vuforia target types (image, cylinder, and cube) using a stand-alone Logitech webcam and the front-facing camera on the Hololens 2. The hand-eye calibration projection errors were 1.4 ± 0.6 pixels for the Logitech camera and 2.3 ± 1.2 pixels for the Hololens 2 camera. The cylinder target provided the most stable and accurate tracking, with mean errors of 12.5 ± 0.6 mm and 10.7 ± 0.0 mm for the Logitech and Hololens 2 cameras, respectively. These results show that Vuforia has promising potential for integration into surgical navigation systems, but the type and size of target must be optimized for the particular surgical scenario to minimize tracking error. Future work will use our framework to perform a more robust analysis of optimal target shapes and sizes for vision-based navigation systems, both independently and when fused with the Simultaneous Localization and Mapping (SLAM) based tracking embedded with the Microsoft Hololens 2.

Proceedings Article | 4 April 2022 Poster + Paper

Development of a mini stereotactic guidance system for percutaneous focal liver tumor ablation

Joeana Cambranis Romero, Terry Peters, Elvis C. Chen

Proceedings Volume 12034, 120342F (2022) https://doi.org/10.1117/12.2611524

KEYWORDS: Tumors, Calibration, Sensors, Error analysis, Visualization, Liver, 3D modeling, Navigation systems, Ultrasonography, Surgery

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Percutaneous ablation is a viable treatment option for patients with early-stage hepatocellular carcinoma (HCC) who are not candidates for surgical resection or liver transplantation,1 but the efficacy of this procedure depends heavily on the surgeon’s ability to place the ablation probe accurately into the target tumor. This paper introduces a surgical navigation system for guiding an ablation needle percutaneously, using an electromagnetic tracking system and a mini-stereotactic aiming device. A clamp to attach an EM sensor was designed to attach to the a patient-attached needle guider. The pose information from the guider sensor after calibration was used to project a virtual line that follows the needle guider movements, and shows the applicator path before insertion. A surgical navigation application was developed in the 3D Slicer platform and a pose calibration technique was incorporated to ensure that the virtual needle path that is projected from the needle guider aligns with the physical needle once a needle is inserted into the guider. The estimated ablation zone, based on manufacturer’s guidelines, is displayed at the tip of the virtual path to help the user ensure total tumor coverage. The guidance software allows updating the estimated ablation zone in real-time depending on the treatment specifications. The ablation zone is displayed as a 3D model and as an ellipse overlaid on the 2D ultrasound video. A rotation analysis to obtain the angular error between two virtual lines (guider and a pre-calibrated needle) was performed in two different setups. The first was the ideal setup without anything that could bend the pre-calibrated needle, and the second used a Polyvinyl Alcohol cryogel Phantom. The results for the rotation analysis, mean and STD, for the ideal setup, was (0.33 ± 0.29)°; while using the PVA-c phantom the results (2.70 ± 0.07)°. These results suggest that the disposable mini-stereotactic needle guider has the potential to assist the surgeons in the accurate placement of the ablation needle in the clinical setting.

Proceedings Article | 4 April 2022 Poster + Paper

Development of a multi-modal liver phantom with flow for the validation and training of focal ablation procedures

Noa Chazot, Joeana Cambranis Romero, Terry Peters, Adam Rankin, Elvis C. Chen

Proceedings Volume 12034, 120342R (2022) https://doi.org/10.1117/12.2611919

KEYWORDS: Liver, Tumors, Computed tomography, Speckle, Ultrasonography, Tissues, Fourier transforms, Silicon, Veins, Manufacturing

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Proceedings Article | 4 April 2022 Presentation + Paper

A 2D/3D US/CT-guided system for percutaneous focal liver thermal ablation

Shuwei Xing, Derek Cool, Lori Gardi, Jeffrey Bax, Elvis C. Chen, Terry Peters, Aaron Fenster

Proceedings Volume 12034, 1203413 (2022) https://doi.org/10.1117/12.2612085

KEYWORDS: Calibration, Tumors, Liver, 3D image processing, Computed tomography, Mechatronics, Image registration, Optical tracking, Transducers, Visualization

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Proceedings Article | 4 April 2022 Poster + Presentation + Paper

Towards ultrasound-based navigation: deep learning based IVC lumen segmentation from intracardiac echocardiography

Hareem Nisar, Patrick Carnahan, Djalal Fakim, Humayon Akhuanzada, David Hocking, Terry Peters, Elvis C. Chen

Proceedings Volume 12034, 1203422 (2022) https://doi.org/10.1117/12.2611117

KEYWORDS: Image segmentation, Ultrasonography, Navigation systems, Intravascular ultrasound, Echocardiography, Neural networks, Image processing, Heart, Veins, Medical research

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Proceedings Article | 16 March 2020 Paper

Patient-specific, dynamic models of hypoplastic left heart syndrome tricuspid valves for simulation and planning

Nora Boone, Hannah Nam, John Moore, Patrick Carnahan, Olivia Ginty, Christian Herz, Andras Lasso, Matthew Jolley, Elvis C. Chen, Terry Peters

Proceedings Volume 11315, 113152E (2020) https://doi.org/10.1117/12.2549745

KEYWORDS: Process modeling, 3D modeling, Heart, Silicon, Pathology, Image segmentation, Data modeling, Ultrasonography, Surgery, Visual process modeling

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Proceedings Article | 16 March 2020 Presentation + Paper

Miniature C-arm simulator using wireless accelerometer based tracking

Daniel Allen, John Moore, Abigayel Joschko, Collin Clarke, Terry Peters, Elvis C. Chen

Proceedings Volume 11315, 1131502 (2020) https://doi.org/10.1117/12.2547388

KEYWORDS: Spine, X-rays, Visualization, Computer simulations, 3D modeling, Radiography, Control systems, Fluoroscopy, Human-machine interfaces, Virtual reality

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Proceedings Article | 16 March 2020 Presentation + Paper

Multi-view 3D echocardiography volume compounding for mitral valve procedure planning

Patrick Carnahan, John Moore, Daniel Bainbridge, Elvis C. Chen, Terry Peters

Proceedings Volume 11315, 1131510 (2020) https://doi.org/10.1117/12.2549598

KEYWORDS: Echocardiography, 3D image processing, Ultrasonography, Image processing, Visualization, Image registration, Image quality

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Proceedings Article | 16 March 2020 Presentation + Paper

Towards electromagnetic tracking of J-tip guidewire: precision assessment of sensors during bending tests

Roberta Piazza, Hareem Nisar, John Moore, Sara Condino, Mauro Ferrari, Vincenzo Ferrari, Terry Peters, Elvis C. Chen

Proceedings Volume 11315, 1131506 (2020) https://doi.org/10.1117/12.2549764

KEYWORDS: Sensors, Computer aided design, Electromagnetism, Navigation systems, Sensor performance, Manufacturing, Surgery, Image sensors

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Proceedings Article | 16 March 2020 Paper

Applications of VR medical image visualization to chordal length measurements for cardiac procedures

Patrick Carnahan, John Moore, Daniel Bainbridge, Gavin Wheeler, Shujie Deng, Kuberan Pushparajah, Elvis C. Chen, John Simpson, Terry Peters

Proceedings Volume 11315, 1131528 (2020) https://doi.org/10.1117/12.2549597

KEYWORDS: Virtual reality, Visualization, Echocardiography, 3D image processing, Ultrasonography, Volume rendering, 3D displays, Medical image visualization, Medical imaging

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Proceedings Article | 8 March 2019 Presentation + Paper

The effect of imaging and tracking parameters on ultrasound probe calibration robustness

Leah Groves, Adam Rankin, Terry Peters, Elvis C. Chen

Proceedings Volume 10951, 109510X (2019) https://doi.org/10.1117/12.2513057

KEYWORDS: Calibration, Visualization, Ultrasonography, Matrices, Virtual reality, Sensors, Image segmentation, 3D image processing, Image registration, Detection and tracking algorithms

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Proceedings Article | 8 March 2019 Paper

Ultrasound calibration for unique 2.5D conical images

Hareem Nisar, John Moore, Natasha Alves, Germain Hwang, Terry Peters, Elvis C. Chen

Proceedings Volume 10951, 1095126 (2019) https://doi.org/10.1117/12.2506193

KEYWORDS: Calibration, Ultrasonography, 3D image processing, Imaging systems, Sensors, Data acquisition, Precision calibration, Magnetic tracking

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SPIE Journal Paper | 9 February 2018

Signal dropout correction-based ultrasound segmentation for diastolic mitral valve modeling

Wenyao Xia, John Moore, Elvis C. S. Chen, Yuanwei Xu, Olivia Ginty, Daniel Bainbridge, Terry M. Peters

JMI, Vol. 5, Issue 02, 021214, (February 2018) https://doi.org/10.1117/12.10.1117/1.JMI.5.2.021214

KEYWORDS: Image segmentation, Image processing algorithms and systems, 3D modeling, Electronic filtering, Ultrasonography, Data modeling, Image fusion, 3D image processing, 3D acquisition, Echocardiography

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Proceedings Article | 27 March 2017 Paper

Is pose-based pivot calibration superior to sphere fitting?

Burton Ma, Niloofar Banihaveb, Joy Choi, Elvis C. Chen, Amber Simpson

Proceedings Volume 10135, 101351U (2017) https://doi.org/10.1117/12.2256050

KEYWORDS: Calibration, Quality measurement, Kinematics, Motion models, MATLAB, Computing systems, Aluminum, Electrical engineering, Computer science

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Proceedings Article | 10 March 2017 Paper

Hologram stability evaluation for Microsoft HoloLens

Reid Vassallo, Adam Rankin, Elvis C. Chen, Terry Peters

Proceedings Volume 10136, 1013614 (2017) https://doi.org/10.1117/12.2255831

KEYWORDS: Holograms, Head-mounted displays, Image-guided intervention, Augmented reality, Safety, Optical testing, Measurement devices, Image analysis, Optical tracking, Head, Software development, Calibration

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Proceedings Article | 3 March 2017 Presentation + Paper

Which point-line registration?

Elvis C. Chen, Terry Peters, Burton Ma

Proceedings Volume 10135, 1013509 (2017) https://doi.org/10.1117/12.2253692

KEYWORDS: Calibration, Detection and tracking algorithms, Cameras, Computer simulations, 3D modeling, Coded apertures, 3D image processing, 3D metrology

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SPIE Journal Paper | 28 February 2017

Effects of line fiducial parameters and beamforming on ultrasound calibration

Golafsoun Ameri, John S. Baxter, A. Jonathan McLeod, Terry Peters, Elvis C. Chen

JMI, Vol. 4, Issue 01, 015002, (February 2017) https://doi.org/10.1117/12.10.1117/1.JMI.4.1.015002

KEYWORDS: Calibration, Image segmentation, Ultrasonography, Image resolution, Magnetic tracking, Image registration, Image processing, Error analysis, Image quality, Scanners

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SPIE Journal Paper | 14 June 2016

Optimization-based interactive segmentation interface for multiregion problems

John S. Baxter, Martin Rajchl, Terry Peters, Elvis C. Chen

JMI, Vol. 3, Issue 02, 024003, (June 2016) https://doi.org/10.1117/12.10.1117/1.JMI.3.2.024003

KEYWORDS: Image segmentation, Human-machine interfaces, Interfaces, Brain, Data modeling, Blood, Medical imaging, Computed tomography, Magnetic resonance imaging, Image processing algorithms and systems

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Proceedings Article | 4 April 2016 Paper

Characterization of various tissue mimicking materials for medical ultrasound imaging

Audrey Thouvenot, Tamie Poepping, Terry Peters, Elvis C. Chen

Proceedings Volume 9783, 97835E (2016) https://doi.org/10.1117/12.2218160

KEYWORDS: Tissues, Ultrasonography, Signal attenuation, Medical imaging, Medical research, Diagnostics, Acoustics, Liquids, Transducers, Manufacturing, Silicon

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Proceedings Article | 18 March 2016 Paper

Estimation of line-based target registration error

Burton Ma, Terry Peters, Elvis C. Chen

Proceedings Volume 9786, 978626 (2016) https://doi.org/10.1117/12.2217059

KEYWORDS: Calibration, Ultrasonography, Error analysis, Image registration, Computer simulations, Transducers, Magnetic sensors, Image segmentation, Magnetic tracking

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Proceedings Article | 18 March 2016 Paper

Freehand 3D-US reconstruction with robust visual tracking with application to ultrasound-augmented laparoscopy

Uditha Jayarathne, Elvis C. Chen, John Moore, Terry Peters

Proceedings Volume 9786, 978617 (2016) https://doi.org/10.1117/12.2214338

KEYWORDS: Laparoscopy, Ultrasonography, Optical tracking, 3D acquisition, Visualization, 3D image reconstruction, Cameras, Calibration

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Proceedings Article | 21 April 2015 Paper

Optimization-based interactive segmentation interface for multi-region problems

John S. H. Baxter, Martin Rajchl, Terry Peters, Elvis C. S. Chen

Proceedings Volume 9413, 94133T (2015) https://doi.org/10.1117/12.2081388

KEYWORDS: Image segmentation, Human-machine interfaces, Medical imaging, Blood, Brain, Image processing algorithms and systems, Data modeling, Visualization, Algorithm development, Magnetic resonance imaging

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Proceedings Article | 18 March 2015 Paper

Line fiducial material and thickness considerations for ultrasound calibration

Golafsoun Ameri, A. McLeod, John S. Baxter, Elvis C. Chen, Terry Peters

Proceedings Volume 9415, 941529 (2015) https://doi.org/10.1117/12.2081294

KEYWORDS: Calibration, Image segmentation, Ultrasonography, Error analysis, Image resolution, Image-guided intervention, Synthetic aperture imaging, Image registration, Detection and tracking algorithms, Magnetic tracking

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Ultrasound calibration is a necessary procedure in many image-guided interventions, relating the position of tools and anatomical structures in the ultrasound image to a common coordinate system. This is a necessary component of augmented reality environments in image-guided interventions as it allows for a 3D visualization where other surgical tools outside the imaging plane can be found. Accuracy of ultrasound calibration fundamentally affects the total accuracy of this interventional guidance system. Many ultrasound calibration procedures have been proposed based on a variety of phantom materials and geometries. These differences lead to differences in representation of the phantom on the ultrasound image which subsequently affect the ability to accurately and automatically segment the phantom. For example, taut wires are commonly used as line fiducials in ultrasound calibration. However, at large depths or oblique angles, the fiducials appear blurred and smeared in ultrasound images making it hard to localize their cross-section with the ultrasound image plane. Intuitively, larger diameter phantoms with lower echogenicity are more accurately segmented in ultrasound images in comparison to highly reflective thin phantoms. In this work, an evaluation of a variety of calibration phantoms with different geometrical and material properties for the phantomless calibration procedure was performed. The phantoms used in this study include braided wire, plastic straws, and polyvinyl alcohol cryogel tubes with different diameters. Conventional B-mode and synthetic aperture images of the phantoms at different positions were obtained. The phantoms were automatically segmented from the ultrasound images using an ellipse fitting algorithm, the centroid of which is subsequently used as a fiducial for calibration. Calibration accuracy was evaluated for these procedures based on the leave-one-out target registration error. It was shown that larger diameter phantoms with lower echogenicity are more accurately segmented in comparison to highly reflective thin phantoms. This improvement in segmentation accuracy leads to a lower fiducial localization error, which ultimately results in low target registration error. This would have a profound effect on calibration procedures and the feasibility of different calibration procedures in the context of image-guided procedures.

Proceedings Article | 18 March 2015 Paper

Acoustic characterization of polyvinyl chloride and self-healing silicone as phantom materials

Dennis Ceh, Terry Peters, Elvis C. Chen

Proceedings Volume 9412, 94123G (2015) https://doi.org/10.1117/12.2081449

KEYWORDS: Signal attenuation, Silicon, Acoustics, Tissues, Ultrasonography, Transducers, Skin, Oscilloscopes, Medical imaging, Solids

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Proceedings Article | 12 March 2014 Paper

Synthetic aperture imaging in ultrasound calibration

Golafsoun Ameri, John S. Baxter, A. Jonathan McLeod, Uditha Jayaranthe, Elvis C. Chen, Terry Peters

Proceedings Volume 9036, 90361I (2014) https://doi.org/10.1117/12.2043899

KEYWORDS: Calibration, Ultrasonography, Image segmentation, Image resolution, Synthetic aperture imaging, Magnetic tracking, Image registration, Electroluminescent displays, Calcium, Image processing

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Proceedings Article | 12 March 2014 Paper

Solving for free-hand and real-time 3D ultrasound calibration with anisotropic orthogonal Procrustes analysis

Elvis C. Chen, A. Jonathan McLeod, Uditha Jayarathne, Terry Peters

Proceedings Volume 9036, 90361Z (2014) https://doi.org/10.1117/12.2043080

KEYWORDS: Calibration, Ultrasonography, 3D acquisition, Optical spheres, Magnetic tracking, Image registration, 3D image processing, Algorithm development, Silicon, Numerical analysis

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Proceedings Article | 17 February 2012 Paper

Intra-operative Prostate Motion Tracking Using Surface Markers for Robot-Assisted Laparoscopic Radical Prostatectomy: A Phantom Study

Mehdi Esteghamatian, Kripasindhu Sarkar, Stephen Pautler, Elvis C. Chen, Terry Peters

Proceedings Volume 8316, 83162N (2012) https://doi.org/10.1117/12.911151

KEYWORDS: Laparoscopy, Prostate, Cameras, Optical tracking, Magnetic resonance imaging, Surgery, Image registration, Calibration, 3D image processing, 3D acquisition

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Proceedings Article | 17 February 2012 Paper

Towards real-time 3D US-CT registration on the beating heart for guidance of minimally invasive cardiac interventions

Feng Li, Pencilla Lang, Martin Rajchl, Elvis C. Chen, Gerard Guiraudon, Terry Peters

Proceedings Volume 8316, 831615 (2012) https://doi.org/10.1117/12.911605

KEYWORDS: Ultrasonography, Computed tomography, Image registration, Image segmentation, Heart, Surgery, Navigation systems, Motion models, 3D image processing, Imaging systems

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Proceedings Article | 17 February 2012 Paper

An augmented reality platform for planning of minimally invasive cardiac surgeries

Elvis C. Chen, Kripasindhu Sarkar, John Baxter, John Moore, Chris Wedlake, Terry Peters

Proceedings Volume 8316, 831617 (2012) https://doi.org/10.1117/12.911998

KEYWORDS: Cameras, Autoregressive models, Surgery, Glasses, Calibration, Optical tracking, Imaging systems, Distortion, Video, Optical calibration

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Proceedings Article | 2 March 2011 Paper

A unified framework for voxel classification and triangulation

John S. Baxter, Terry Peters, Elvis C. Chen

Proceedings Volume 7964, 796436 (2011) https://doi.org/10.1117/12.877715

KEYWORDS: Visualization, Data modeling, Binary data, Optical spheres, Volume rendering, Brain, Magnetic resonance imaging, Medical imaging, Visual process modeling, Image classification

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Proceedings Article | 2 March 2011 Paper

GPU accelerated registration of a statistical shape model of the lumbar spine to 3D ultrasound images

Siavash Khallaghi, Purang Abolmaesumi, Ren Hui Gong, Elvis Chen, Sean Gill, Jonathan Boisvert, David Pichora, Dan Borschneck, Gabor Fichtinger, Parvin Mousavi

Proceedings Volume 7964, 79642W (2011) https://doi.org/10.1117/12.878377

KEYWORDS: Image registration, Ultrasonography, 3D modeling, Statistical modeling, Spine, Computed tomography, 3D image processing, Graphics processing units, Error analysis, Bone

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Proceedings Article | 2 March 2011 Paper

Feature-based US to CT registration of the aortic root

Pencilla Lang, Elvis C. Chen, Gerard Guiraudon, Doug Jones, Daniel Bainbridge, Michael Chu, Maria Drangova, Noby Hata, Ameet Jain, Terry Peters

Proceedings Volume 7964, 79641G (2011) https://doi.org/10.1117/12.878386

KEYWORDS: Image registration, Computed tomography, Fluoroscopy, Ultrasonography, Heart, Visualization, Detection and tracking algorithms, 3D acquisition, Image segmentation, Reconstruction algorithms

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Proceedings Article | 24 February 2010 Paper

Ultrasound guided spine needle insertion

Elvis C. Chen, Parvin Mousavi, Sean Gill, Gabor Fichtinger, Purang Abolmaesumi

Proceedings Volume 7625, 762538 (2010) https://doi.org/10.1117/12.843716

KEYWORDS: Navigation systems, Spine, Computed tomography, Transducers, Image registration, Ultrasonography, Sensors, Visualization, Tissues, X-ray computed tomography

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Proceedings Article | 24 February 2010 Paper

Representing flexible endoscope shapes with hermite splines

Elvis C. Chen, Sharyle Fowler, Lawrence Hookey, Randy Ellis

Proceedings Volume 7625, 76251D (2010) https://doi.org/10.1117/12.844234

KEYWORDS: Endoscopes, Visualization, Sensors, Surgery, Navigation systems, Endoscopy, Electromagnetism, Optical tracking, Magnetic sensors, Human-machine interfaces

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