Dr. Vikram Chalana Profile

Dr. Vikram Chalana

Senior Engineer at Diagnostic Ultrasound Corp

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Author

Publications (15)

Proceedings Article | 15 May 2003 Paper

Image enhancement and segmentation of fluid-filled structures in 3D ultrasound images

Vikram Chalana, Stephen Dudycha, Gerald McMorrow

Proceedings Volume 5032, (2003) https://doi.org/10.1117/12.481382

KEYWORDS: Image segmentation, Image enhancement, Bladder, 3D image enhancement, 3D image processing, Ultrasonography, Image filtering, Electronic filtering, Image processing algorithms and systems, 3D metrology

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Proceedings Article | 3 July 2001 Paper

Validation of brain segmentation and tissue classification algorithm for T1-weighted MR images

Vikram Chalana, Lydia Ng, Larry Rystrom, James Gee, David Haynor

Proceedings Volume 4322, (2001) https://doi.org/10.1117/12.431079

KEYWORDS: Brain, Image segmentation, Tissues, Neuroimaging, Image processing algorithms and systems, Magnetic resonance imaging, Algorithm development, Image registration, Image classification, Head

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Proceedings Article | 6 June 2000 Paper

General-purpose software tool for serial segmentation of stacked images

Vikram Chalana, Michael Sannella, David Haynor

Proceedings Volume 3979, (2000) https://doi.org/10.1117/12.387675

KEYWORDS: Image segmentation, Image processing algorithms and systems, Detection and tracking algorithms, Algorithm development, Motion estimation, Brain, Image filtering, Medical imaging, Human-machine interfaces, 3D image processing

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Proceedings Article | 26 May 1999 Paper

Interactive tool for visualization and segmentation of permanent radioactive seeds in postoperative prostate brachytherapy CT images

Sayan Pathak, Kevin Stoknes, Peter Grimm, Jacque Estlund, Vikram Chalana, Yongmin Kim

Proceedings Volume 3658, (1999) https://doi.org/10.1117/12.349417

KEYWORDS: Prostate, Image segmentation, X-ray computed tomography, Visualization, Human-machine interfaces, Computed tomography, Prostate cancer, Image processing algorithms and systems, Radiation effects, Tissues

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Proceedings Article | 26 May 1999 Paper

Predicting pubic arch interference using multiplanar transrectal ultrasound (TRUS) for prostate brachytherapy

Sayan Pathak, Peter Grimm, Jacque Estlund, Vikram Chalana, Yongmin Kim

Proceedings Volume 3658, (1999) https://doi.org/10.1117/12.349471

KEYWORDS: Prostate, Ultrasonography, Bone, Tissues, Image segmentation, Visualization, Image enhancement, Speckle, Surgery, Image contrast enhancement

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Proceedings Article | 29 January 1999 Paper

Simultaneous spatiotemporal target segmentation and motion estimation in a variational formulation

Alan Li, Vikram Chalana, Hongkai Zhao

Proceedings Volume 3584, (1999) https://doi.org/10.1117/12.339834

KEYWORDS: Image segmentation, Optical flow, Motion estimation, Image fusion, Image processing algorithms and systems, Automatic target recognition, Image analysis, Motion models, Expectation maximization algorithms, Sensors

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Proceedings Article | 26 June 1998 Paper

Quantitative three-dimensional transrectal ultrasound (TRUS) for prostate imaging

Sayan Pathak, Rene Aarnink, Jean de la Rosette, Vikram Chalana, Hessel Wijkstra, David Haynor, Frans Debruyne, Yongmin Kim

Proceedings Volume 3335, (1998) https://doi.org/10.1117/12.312551

KEYWORDS: Prostate, Image segmentation, Ultrasonography, Image processing algorithms and systems, Image processing, Statistical analysis, 3D image processing, Speckle, Prostate cancer, Error analysis

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Proceedings Article | 24 June 1998 Paper

Unified data structures in a software environment for medical image segmentation

Vikram Chalana, Jennifer Hodgdon, David Haynor

Proceedings Volume 3338, (1998) https://doi.org/10.1117/12.310973

KEYWORDS: Image segmentation, Image processing algorithms and systems, Algorithm development, Medical imaging, Tissues, Computer architecture, Software development, Image classification, Databases, 3D modeling

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Proceedings Article | 1 April 1998 Paper

Duplicate document detection in DocBrowse

Vikram Chalana, Andrew Bruce, Thien Nguyen

Proceedings Volume 3305, (1998) https://doi.org/10.1117/12.304630

KEYWORDS: Databases, Feature extraction, Detection and tracking algorithms, Optical character recognition, Image retrieval, Algorithm development, Wavelets, Wavelet transforms, Vector spaces, Digital libraries

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Proceedings Article | 7 May 1997 Paper

MedPlus: a medical image analysis and browsing environment

Vikram Chalana, Mysore Jaisimha, David Haynor, Emmanuel Arbogast

Proceedings Volume 3031, (1997) https://doi.org/10.1117/12.273925

KEYWORDS: Databases, Medical imaging, Image analysis, Image processing, Statistical analysis, Visualization, Analytical research, Head, Image visualization, Algorithm development

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Proceedings Article | 7 May 1997 Paper

Multimedia systems in ultrasound image boundary detection and measurements

Sayan Pathak, Vikram Chalana, Yongmin Kim

Proceedings Volume 3031, (1997) https://doi.org/10.1117/12.273917

KEYWORDS: Ultrasonography, Image processing, Head, Digital signal processing, Detection and tracking algorithms, Signal processing, Multimedia, Algorithm development, Sun, Fetus

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Ultrasound as a medical imaging modality offers the clinician a real-time of the anatomy of the internal organs/tissues, their movement, and flow noninvasively. One of the applications of ultrasound is to monitor fetal growth by measuring biparietal diameter (BPD) and head circumference (HC). We have been working on automatic detection of fetal head boundaries in ultrasound images. These detected boundaries are used to measure BPD and HC. The boundary detection algorithm is based on active contour models and takes 32 seconds on an external high-end workstation, SUN SparcStation 20/71. Our goal has been to make this tool available within an ultrasound machine and at the same time significantly improve its performance utilizing multimedia technology. With the advent of high- performance programmable digital signal processors (DSP), the software solution within an ultrasound machine instead of the traditional hardwired approach or requiring an external computer is now possible. We have integrated our boundary detection algorithm into a programmable ultrasound image processor (PUIP) that fits into a commercial ultrasound machine. The PUIP provides both the high computing power and flexibility needed to support computationally-intensive image processing algorithms within an ultrasound machine. According to our data analysis, BPD/HC measurements made on PUIP lie within the interobserver variability. Hence, the errors in the automated BPD/HC measurements using the algorithm are on the same order as the average interobserver differences. On PUIP, it takes 360 ms to measure the values of BPD/HC on one head image. When processing multiple head images in sequence, it takes 185 ms per image, thus enabling 5.4 BPD/HC measurements per second. Reduction in the overall execution time from 32 seconds to a fraction of a second and making this multimedia system available within an ultrasound machine will help this image processing algorithm and other computer-intensive imaging applications become a practical tool for the sonographers in the feature.

Proceedings Article | 25 April 1997 Paper

Parameter estimation in deformable models using Markov chain Monte Carlo

Vikram Chalana, David Haynor, Paul Sampson, Yongmin Kim

Proceedings Volume 3034, (1997) https://doi.org/10.1117/12.274096

KEYWORDS: Expectation maximization algorithms, Monte Carlo methods, Statistical analysis, Data modeling, Statistical modeling, Image segmentation, Medical imaging, Mathematical modeling, Stochastic processes, Data analysis

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Proceedings Article | 16 April 1996 Paper

Methodology for evaluation of image segmentation algorithms on medical images

Vikram Chalana, Yongmin Kim

Proceedings Volume 2710, (1996) https://doi.org/10.1117/12.237922

KEYWORDS: Image processing algorithms and systems, Image segmentation, Distance measurement, Medical imaging, Skull, Ultrasonography, Head, Error analysis, Echocardiography, Fetus

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Proceedings Article | 12 May 1995 Paper

Integrating region growing and edge detection using regularization

Vikram Chalana, Wendy Costa, Yongmin Kim

Proceedings Volume 2434, (1995) https://doi.org/10.1117/12.208697

KEYWORDS: Image segmentation, Data modeling, Sensors, Edge detection, Statistical modeling, Echocardiography, Ultrasonography, Image processing algorithms and systems, Image processing, Convolution

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Proceedings Article | 11 May 1994 Paper

Left-ventricular boundary detection from short-axis echocardiograms: the use of active contour models

Vikram Chalana, David Haynor, Yongmin Kim

Proceedings Volume 2167, (1994) https://doi.org/10.1117/12.175117

KEYWORDS: 3D modeling, Detection and tracking algorithms, 3D image processing, Heart, Edge detection, Ultrasonography, Image processing, Image filtering, Image segmentation, Digital filtering

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Showing 5 of 15 publications

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