Scholars@Duke
James T. Dobbins III

James T. Dobbins III

Professor Emeritus in Radiology
Radiology
2424 Erwin Road, Suite 302, Durham, NC 27705
2424 Erwin Road, Suite 302, Durham, NC 27705

Scholarly Works - Conferences

Multi-x-ray source array for stationary tomosynthesis or multi-cone angle cone beam CT.

Conference Proc SPIE Int Soc Opt Eng · February 2019 Field-emission x-ray source arrays have been studied for both tomosynthesis and CT applications, however these arrays tend to have limited output. We propose the use of multi-source x-ray arrays using thermionic cathodes, contained within a single vacuum h ... Full text Link to item Cite

Q&A

Conference MEDICAL PHYSICS · June 2018 Link to item Cite

Population of 100 realistic, patient-based computerized breast phantoms for multi-modality imaging research

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · January 1, 2014 Featured Publication Breast imaging is an important area of research with many new Techniques being investigated To further reduce The morbidity and mortality of breast cancer Through early detection. Computerized phantoms can provide an essential Tool To quantitatively compar ... Full text Cite

TH‐A‐103‐10: Improved Segmentation of Low‐Contrast Fibroglandular Structures in High‐Noise Breast CT Volumes for XCAT Modeling

Conference Medical Physics · January 1, 2013 Purpose: This work improves the accuracy and realism of automated breast computed tomography (bCT) tissue segmentation by refining the detection of low‐contrast fibroglandular structures to produce high‐resolution realistic computer‐generated (XCAT) breast ... Full text Cite

Development of matched virtual and physical breast phantoms based on patient data

Conference Progress in Biomedical Optics and Imaging - Proceedings of SPIE · 2013 Featured Publication Physical phantoms are essential for the development, optimization, and clinical evaluation of x-ray systems. These phantoms are used for various tests such as quality assurance testing, system characterization, reconstruction evaluation, and dosimetry. The ... Full text Cite

WE-E-217BCD-01: Digital Breast Tomosynthesis: Basic Principles and the QMP's Role.

Conference Med Phys · June 2012 UNLABELLED: Digital breast tomosynthesis is a form of limited angle tomography, in which section (slice) images are produced from a series of discrete projection images acquired at different angles. Tomosynthesis can be useful in breast imaging by providin ... Full text Link to item Cite

Development of a dynamic 4D anthropomorphic breast phantom for contrast-based breast imaging

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · May 4, 2012 Mammography is currently the most widely accepted tool for detection and diagnosis of breast cancer. However, the sensitivity of mammography is reduced in women with dense breast tissue due to tissue overlap, which may obscure lesions. Digital breast tomos ... Full text Cite

TU‐A‐218‐01: Estimation of the 2‐D Presampled MTF of a Digital Flat Panel Detector Using an Edge Test Device

Conference Medical Physics · January 1, 2012 Purpose: In this work, we report on the novel application of an opaque edge test device for practical estimation of the 2‐D modulation transfer function (MTF) of a digital flat panel (DFP) detector. Methods: We estimated the 2‐ D MTF of a prototype GE Revo ... Full text Cite

TU‐A‐217A‐02: Radiographic Tomosynthesis: Reconstruction Algorithms

Conference Medical Physics · January 1, 2012 Digital tomosynthesis is a form of limited angle tomography, in which section (slice) images are produced from a series of discrete projection images acquired at different angles. The simplest form of tomosynthesis reconstruction is the shift‐and‐add techn ... Full text Cite

Initial investigation into lower-cost CT for resource limited regions of the world

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · December 1, 2010 This paper describes an initial investigation into means for producing lower-cost CT scanners for resource limited regions of the world. In regions such as sub-Saharan Africa, intermediate level medical facilities serving millions have no CT machines, and ... Full text Cite

WE‐E‐201C‐03: Plate‐Specific Gain Map Correction for the Improvement of DQE in Computed Radiography

Conference Medical Physics · January 1, 2010 Purpose: To improve the NPS, and thus DQE, of CR images by correcting for pixel‐to‐pixel gain variations specific to each plate. Method and Materials: Ten high‐exposure, open field images were taken with an RQA5 spectrum, with a sixth generation CR plate s ... Full text Cite

Computerized 3D breast phantom with enhanced High-Resolution detail

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · June 15, 2009 We previously proposed a three-dimensional computerized breast phantom that combines empirical data with the flexibility of mathematical models1. The goal of this project is to enhance the breast phantom to include a more detailed anatomy than currently vi ... Full text Cite

TU‐C‐211A‐01: Becoming a Better Teacher

Conference Medical Physics · January 1, 2009 Every medical physicist is a teacher, either formally in the classroom or informally in the clinic. Some physicists skillfully fulfill their educational obligations, while others struggle with their teaching responsibilities. However, everyone can be a goo ... Full text Cite

Three-dimensional computer generated breast phantom based on empirical data

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · May 14, 2008 The goal of this work is to create a detailed three-dimensional (3D) digital breast phantom based on empirical data and to incorporate it into the four-dimensional (4D) NCAT phantom, a computerized model of the human anatomy widely used in imaging research ... Full text Cite

Methodology of NEQ (f) analysis for optimization and comparison of digital breast tomosynthesis acquisition techniques and reconstruction algorithms

Conference Progress in Biomedical Optics and Imaging Proceedings of SPIE · October 15, 2007 As a new three-dimensional imaging technique, digital breast tomosynthesis allows the reconstruction of an arbitrary set of planes in the breast from a limited-angle series of projection images. Though several tomosynthesis algorithms have been proposed, n ... Full text Cite

MO‐D‐L100F‐03: New Developments in Digital Breast Tomosynthesis

Conference Medical Physics · January 1, 2007 Digital tomosynthesis is one of the most exciting recent developments in breast imaging. By modifying existing full field digital mammography systems, one can achieve this type of limited‐angle cone‐beam CT imaging which produces 3D slice images of the bre ... Full text Cite

SU‐FF‐I‐21: Two‐Dimensional Shift‐And‐Add (SAA) Algorithm for Digital Breast Tomosynthesis Reconstruction

Conference Medical Physics · January 1, 2006 Purpose: To investigate a two‐dimensional Shift‐And‐Add algorithm for three‐dimensional digital breast tomosynthsis reconstruction to correct for defects existing in the traditional Shift‐And‐Add algorithm that calculates only one‐dimensional shift amount ... Full text Cite

SU‐FF‐I‐48: Assessment of Detective Quantum Efficiency: Inter‐Comparison of IEC 62220‐1 with Representative Prior Methods

Conference Medical Physics · January 1, 2006 Purpose: To evaluate a new international standard method for the measurement of detective quantum efficiency (DQE) of digital radiography systems in comparison with representative prior methods. Methods and Materials: Three DQE evaluation methods were cons ... Full text Cite

Online Digital Tomosynthesis (DTS): A Novel Technique for Improving Target Localization in Radiation Therapy

Conference International Journal of Radiation Oncology*Biology*Physics · October 2005 Full text Cite

SU‐FF‐J‐57: Digital Tomosynthesis for Verification of Radiation Therapy Positioning: Preliminary Results From a Kilovoltage On‐Board Imaging System

Conference Medical Physics · January 1, 2005 Purpose: This study introduces a new radiation therapy target localization technique using online digital tomosynthesis (DTS), a method for reconstructing 3‐D slices from 2‐D projection data acquired with limited source motion. By separating the visualizat ... Full text Cite

Tomosynthesis imaging of the chest

Conference MEDICAL PHYSICS · June 2003 Link to item Cite

Proceedings of SPIE - The International Society for Optics: Introduction

Conference Proceedings of SPIE the International Society for Optical Engineering · December 1, 1998 Cite

Dual-energy computed radiography: Improvements in processing

Conference Proceedings of SPIE the International Society for Optical Engineering · May 11, 1994 We have reported on a single-exposure dual-energy system based on computed radiography (CR) technology. In a clinical study conducted over a two year period, the dual-energy system proved to be highly successful in improving the detection (p=0.0005) and ch ... Full text Cite