Donald B. Plewes

chapter

Exploring Symmetries in Breast MRI Scan

Robert Alterson, Donald B. Plewes

Lecture Notes in Computer Science > Medical Image Computing and Computer-Assisted Intervention - MICCAI 2003 > Segmentation II > 754-761

In this work we employ computer-vision techniques to detect natural biological symmetries in breast MR scans. Currently, breast MR images are assessed in terms of the kinetics and location of uptake of Gd-DTPA. However, mammographic interpretation often uses symmetry between left and right breasts to indicate the site of potential tumour masses but has not been used in breast MRI. In this study, we...

chapter

Piecewise-Quadrilateral Registration by Optical Flow – Applications in Contrast-Enhanced MR Imaging of the Breast

Michael S. Froh, David C. Barber, Kristy K. Brock, Donald B. Plewes, more

Lecture Notes in Computer Science > Medical Image Computing and Computer-Assisted Intervention – MICCAI 2006 > Registration II > 686-693

In this paper we propose a method for the nonrigid registration of contrast-enhanced dynamic sequences of magnetic resonance(MR) images. The algorithm has been developed with accuracy in mind, but also has a clinically viable execution time (i.e. a few minutes) as a goal. The algorithm is driven by multiresolution optical flow with the brightness consistency assumption relaxed, subject to a regularized...

article

Exploiting sparsity in x-f space for higher spatiotemporal resolution in breast dynamic contrast-enhanced (DCE)-MRI

Muhammad Usman, Elizabeth A. Ramsay, Peter Siegler, Donald B. Plewes, more

European Journal of Radiology > 2012 > 81 > Supplement 1 > S171-S173

article

Supine breast MRI and assessment of future clinical applications

Peter Siegler, Mehran Ebrahimi, Claire M.B. Holloway, Gilbert Thevathasan, more

European Journal of Radiology > 2012 > 81 > Supplement 1 > S153-S155

article

Physics of MRI: A primer

Donald B. Plewes, Walter Kucharczyk

Journal of Magnetic Resonance Imaging > 35 > 5 > 1038 - 1054

This article is based on an introductory lecture given for the past many years during the “MR Physics and Techniques for Clinicians” course at the Annual Meeting of the ISMRM. This introduction is not intended to be a comprehensive overview of the field, as the subject of magnetic resonance imaging (MRI) physics is large and complex. Rather, it is intended to lay a conceptual foundation by which magnetic...

article

Physics of MRI: A primer

Donald B. Plewes, Walter Kucharczyk

Journal of Magnetic Resonance Imaging > 35 > 5 > spcone - spcone

This article is based on an introductory lecture given for the past many years during the “MR Physics and Techniques for Clinicians” course at the Annual Meeting of the ISMRM. This introduction is not intended to be a comprehensive overview of the field, as the subject of magnetic resonance imaging (MRI) physics is large and complex. Rather, it is intended to lay a conceptual foundation by which magnetic...

article

The influence of radial undersampling schemes on compressed sensing reconstruction in breast MRI

Rachel W. Chan, Elizabeth A. Ramsay, Edward Y. Cheung, Donald B. Plewes

Magnetic Resonance in Medicine > 67 > 2 > 363 - 377

Fast imaging applications in magnetic resonance imaging (MRI) frequently involve undersampling of k‐space data to achieve the desired temporal resolution. However, high temporal resolution images generated from undersampled data suffer from aliasing artifacts. In radial k‐space sampling, this manifests as undesirable streaks that obscure image detail. Compressed sensing reconstruction has been shown...

article

Supine breast MRI

Peter Siegler, Claire M.B. Holloway, Petrina Causer, Gilbert Thevathasan, more

Journal of Magnetic Resonance Imaging > 34 > 5 > 1212 - 1217

Purpose:To achieve high‐quality unilateral supine breast magnetic resonance imaging (MRI) as a step to facilitate image aiding of clinical applications, which are often performed in the supine position. Contrast‐enhanced breast MRI is a powerful tool for the diagnosis of cancer. However, prone patient positioning typically used for breast MRI hinders its use for image aiding. Materials and Methods:A...

article

Improvement in DCIS Detection Rates by MRI Over Time in a High‐Risk Breast Screening Study

Ellen Warner, Petrina A. Causer, John W‐N. Wong, Frances C. Wright, more

The Breast Journal > 17 > 1 > 9 - 17

Abstract: Although magnetic resonance imaging (MRI) is much more sensitive than mammography for detecting early invasive breast cancer, in many high‐risk screening studies MRI was less sensitive than mammography for detecting ductal carcinoma in situ (DCIS). We reviewed our experience detecting DCIS in our single center study of annual MRI, mammography, ultrasound and clinical breast examination...

article

Evaluation of multicoil breast arrays for parallel imaging

Helen Marshall, Patrick M. Devine, Nishanthan Shanmugaratnam, Ryan Fobel, more

Journal of Magnetic Resonance Imaging > 31 > 2 > 328 - 338

Purpose:To evaluate three multicoil breast arrays for both conventional and SENSE‐accelerated imaging. Materials and Methods:Two commercially available 8‐element coils and a prototype 16‐element coil were compared. One 8‐element array had adjustable coils located next to the breast tissue and the other had a fixed coil arrangement; both were designed to allow parallel imaging in the left–right direction...

article

Predicting Response to Chemotherapy in Locally Advanced Breast Cancer by Diffusion Weighted MRI: A Pilot Study

Caron Murray, Ruby Endre, Elizabeth Ramsay, Donald B. Plewes

Canadian Journal of Medical Radiation Technology > 2007 > 38 > 3 > 51

article

Supine Breast MRI Utilizing a Zonal Motion-Adapted Acquisition and Reordering Technique

Caron Murray, Ruby Endre, Peter Siegler, Donald B. Plewes

Canadian Journal of Medical Radiation Technology > 2007 > 38 > 3 > 52

article

An MRI/US/X-Ray Compatible Breast Localization Marker: In Vivo Evaluation1

Yangmei Li, Claire M.B. Holloway, Carrie M. Purcell, Jianxiong Wang, more

Academic Radiology > 2005 > 12 > 12 > 1557-1566

An in vivo evaluation of a new trimodality breast localization marker was performed with magnetic resonance imaging (MRI), ultrasound (US), x-ray, and histopathology. The evaluation of the marker in animal tests should help define its utility for surgical biopsy localization in humans. Five rabbits were used and sacrificed at 2 days, 1 week, 2 weeks, 4 weeks, and 7 weeks after marker implantation...

INFONA - science communication portal

Search results for: Donald B. Plewes

Exploring Symmetries in Breast MRI Scan

Piecewise-Quadrilateral Registration by Optical Flow – Applications in Contrast-Enhanced MR Imaging of the Breast

Exploiting sparsity in x-f space for higher spatiotemporal resolution in breast dynamic contrast-enhanced (DCE)-MRI

Supine breast MRI and assessment of future clinical applications

Physics of MRI: A primer

Physics of MRI: A primer

The influence of radial undersampling schemes on compressed sensing reconstruction in breast MRI

Supine breast MRI

Improvement in DCIS Detection Rates by MRI Over Time in a High‐Risk Breast Screening Study

Evaluation of multicoil breast arrays for parallel imaging

Predicting Response to Chemotherapy in Locally Advanced Breast Cancer by Diffusion Weighted MRI: A Pilot Study

Supine Breast MRI Utilizing a Zonal Motion-Adapted Acquisition and Reordering Technique

An MRI/US/X-Ray Compatible Breast Localization Marker: In Vivo Evaluation1

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