Grant Gullberg, PhD
Adjunct Professor
Radiology
School of Medicine

Grants and Projects

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• Dynamic cardiac SPECT, NIH, 2017-2021
• Dynamic Cardiac SPECT Imaging, NIH, 1995-2015
• Improved Cardiac SPECT-CT with Converging Hole Collimation, NIH, 1988-2013
• Molecular Imaging of Cardiac Hypertrophy Using microPET and Pinhole SPECT, NIH, 2008-2013
• Improved Cardiac Spect with Convergent Hole Collimators, NIH, 1988-2002
• Fully Three-dimensional Tomography Meeting, NIH, 1993-1994

Publications (169)

Top publication keywords:
Image Processing, Computer-AssistedInterferometryImage Interpretation, Computer-AssistedImaging, Three-DimensionalTomography, Emission-Computed, Single-PhotonImage EnhancementPositron-Emission TomographyTomography, Emission-ComputedModels, CardiovascularCoronary CirculationHeartAlgorithmsHeart VentriclesPhantoms, ImagingMyocardial Perfusion Imaging

• Physical phantom validation of clustering-initiated factorization in dynamic PET.
  Medical physics 2025 Kobzarenko V, Baker SL, Janabi M, Choong WS, Gullberg GT, Seo Y, Boutchko R, Mitra D
• A Technique to Quantify Very Low Activities in Regions of Interest With a Collimatorless Detector.
  IEEE transactions on medical imaging 2024 Caravaca J, Bobba KN, Du S, Peter R, Gullberg GT, Bidkar AP, Flavell RR, Seo Y
• A generalization of the maximum likelihood expectation maximization (MLEM) method: Masked-MLEM.
  Physics in medicine and biology 2023 Zheng Y, Frame E, Caravaca J, Gullberg GT, Vetter K, Seo Y
• Simulation studies of a full-ring, CZT SPECT system for whole-body imaging of 99m Tc and 177 Lu.
  Medical physics 2023 Huh Y, Caravaca J, Kim J, Cui Y, Huang Q, Gullberg G, Seo Y
• An Analytical Algorithm for Tensor Tomography From Projections Acquired About Three Axes.
  IEEE transactions on medical imaging 2022 Tao W, Rohmer D, Gullberg GT, Seo Y, Huang Q

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• Monte Carlo Simulation and Reconstruction: Assessment of Myocardial Perfusion Imaging of Tracer Dynamics With Cardiac Motion Due to Deformation and Respiration Using Gamma Camera With Continuous Acquisition.
  Frontiers in cardiovascular medicine 2022 Huh Y, Shrestha UM, Gullberg GT, Seo Y
• Accuracy and Reproducibility of Myocardial Blood Flow Quantification by Single Photon Emission Computed Tomography Imaging in Patients With Known or Suspected Coronary Artery Disease.
  Circulation. Cardiovascular imaging 2022 de Souza ACDAH, Harms HJ, Martell L, Bibbo C, Harrington M, Sullivan K, Hainer J, Dorbala S, Blankstein R, Taqueti VR, Foley Kijewski M, Park MA, Meretta A, Breault C, Roth N, Poitrasson-Rivière A, …
• Compton and proximity imaging of 225Ac in vivo with a CZT gamma camera: a proof of principle with simulations.
  IEEE transactions on radiation and plasma medical sciences 2022 Caravaca J, Huh Y, Gullberg GT, Seo Y
• Data Management and Network Architecture Effect on Performance Variability in Direct Attenuation Correction via Deep Learning for Cardiac SPECT: A Feasibility Study.
  IEEE transactions on radiation and plasma medical sciences 2021 Torkaman M, Yang J, Shi L, Wang R, Miller EJ, Sinusas AJ, Liu C, Gullberg GT, Seo Y
• X-ray bi-prism interferometry-A design study of proposed novel hardware.
  Medical physics 2021 Gullberg GT, Shrestha U, Kim SJW, Seo Y, Fuller M
• Tomography of dark-field scatter including single-exposure Moiré fringe analysis with X-ray biprism interferometry-A simulation study.
  Medical physics 2021 Tao W, Sung Y, Kim SJW, Huang Q, Gullberg GT, Seo Y, Fuller M
• Novel Methodology for Measuring Regional Myocardial Efficiency.
  IEEE transactions on medical imaging 2021 Gullberg GT, Shrestha UM, Veress AI, Segars WP, Liu J, Ordovas K, Seo Y
• Evaluation of a variable-aperture full-ring SPECT system using large-area pixelated CZT modules: A simulation study for brain SPECT applications.
  Medical physics 2021 Huh Y, Yang J, Dim OU, Cui Y, Tao W, Huang Q, Gullberg GT, Seo Y
• Direct Attenuation Correction Using Deep Learning for Cardiac SPECT: A Feasibility Study.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2021 Yang J, Shi L, Wang R, Miller EJ, Sinusas AJ, Liu C, Gullberg GT, Seo Y
• Direct Image-Based Attenuation Correction using Conditional Generative Adversarial Network for SPECT Myocardial Perfusion Imaging.
  Proceedings of SPIE--the International Society for Optical Engineering 2021 Torkaman M, Yang J, Shi L, Wang R, Miller EJ, Sinusas AJ, Liu C, Gullberg GT, Seo Y
• CT-less Direct Correction of Attenuation and Scatter in the Image Space Using Deep Learning for Whole-Body FDG PET: Potential Benefits and Pitfalls.
  Radiology. Artificial intelligence 2020 Yang J, Sohn JH, Behr SC, Gullberg GT, Seo Y
• Assessment of late-term progression of cardiac allograft vasculopathy in patients with orthotopic heart transplantation using quantitative cardiac 82Rb PET.
  The international journal of cardiovascular imaging 2020 Shrestha UM, Sciammarella M, Pampaloni MH, Botvinick EH, Gullberg GT, DeMarco T, Seo Y
• Transmural Remodeling of Cardiac Microstructure in Aged Spontaneously Hypertensive Rats by Diffusion Tensor MRI.
  Frontiers in physiology 2020 Giannakidis A, Gullberg GT
• Multiresolution spatiotemporal mechanical model of the heart as a prior to constrain the solution for 4D models of the heart.
  Proceedings of SPIE--the International Society for Optical Engineering 2019 Gullberg GT, Veress AI, Shrestha UM, Liu J, Ordovas K, Segars WP, Seo Y
• Joint correction of attenuation and scatter in image space using deep convolutional neural networks for dedicated brain 18F-FDG PET.
  Physics in medicine and biology 2019 Yang J, Park D, Gullberg GT, Seo Y
• PET imaging of glucose and fatty acid metabolism for NAFLD patients.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 2018 Gullberg GT, Shrestha UM, Seo Y
• Tensor Tomography of Dark Field Scatter using X-ray Interferometry with Bi-prisms.
  IEEE Nuclear Science Symposium conference record. Nuclear Science Symposium 2018 Gullberg GT, Fuller M, Shrestha U, Seo Y
• Comparison of sparse domain approaches for 4D SPECT dynamic image reconstruction.
  Medical physics 2018 Mitra D, Abdalah M, Boutchko R, Chang H, Shrestha U, Botvinick E, Seo Y, Gullberg GT
• Dynamic cardiac PET imaging: Technological improvements advancing future cardiac health.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 2018 Gullberg GT, Shrestha UM, Seo Y
• Sparse domain approaches in dynamic SPECT imaging with high-performance computing.
  American journal of nuclear medicine and molecular imaging 2017 Pan H, Chang H, Mitra D, Gullberg GT, Seo Y
• A combined static-dynamic single-dose imaging protocol to compare quantitative dynamic SPECT with static conventional SPECT.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 2017 Sciammarella M, Shrestha UM, Seo Y, Gullberg GT, Botvinick EH
• Design of a short nonuniform acquisition protocol for quantitative analysis in dynamic cardiac SPECT imaging - a retrospective 123 I-MIBG animal study.
  Medical physics 2017 Zan Y, Long Y, Chen K, Li B, Huang Q, Gullberg GT
• Noninvasive PET quantitative myocardial blood flow with regadenoson for assessing cardiac allograft vasculopathy in orthotopic heart transplantation patients.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 2017 Pampaloni MH, Shrestha UM, Sciammarella M, Seo Y, Gullberg GT, Botvinick EH
• Longitudinal Evaluation of Myocardial Fatty Acid and Glucose Metabolism in Fasted and Nonfasted Spontaneously Hypertensive Rats Using MicroPET/CT.
  Molecular imaging 2017 Huber JS, Hernandez AM, Janabi M, O'Neil JP, Brennan KM, Murphy ST, Seo Y, Gullberg GT
• Quantitative analysis of hypertrophic myocardium using diffusion tensor magnetic resonance imaging.
  Journal of medical imaging (Bellingham, Wash.) 2016 Tran N, Giannakidis A, Gullberg GT, Seo Y
• On the averaging of cardiac diffusion tensor MRI data: the effect of distance function selection.
  Physics in medicine and biology 2016 Giannakidis A, Melkus G, Yang G, Gullberg GT
• Value of Formalin Fixation for the Prolonged Preservation of Rodent Myocardial Microanatomical Organization: Evidence by MR Diffusion Tensor Imaging.
  Anatomical record (Hoboken, N.J. : 2007) 2016 Giannakidis A, Gullberg GT, Pennell DJ, Firmin DN
• Measurement of absolute myocardial blood flow in humans using dynamic cardiac SPECT and 99mTc-tetrofosmin: Method and validation.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 2015 Shrestha U, Sciammarella M, Alhassen F, Yeghiazarians Y, Ellin J, Verdin E, Boyle A, Seo Y, Botvinick EH, Gullberg GT
• Image reconstruction in higher dimensions: myocardial perfusion imaging of tracer dynamics with cardiac motion due to deformation and respiration.
  Physics in medicine and biology 2015 Shrestha UM, Seo Y, Botvinick EH, Gullberg GT
• Clustering-initiated factor analysis application for tissue classification in dynamic brain positron emission tomography.
  Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism 2015 Boutchko R, Mitra D, Baker SL, Jagust WJ, Gullberg GT
• The direct incorporation of perfusion defect information to define ischemia and infarction in a finite element model of the left ventricle.
  Journal of biomechanical engineering 2015 Veress AI, Fung GS, Lee TS, Tsui BM, Kicska GA, Paul Segars W, Gullberg GT
• Longitudinal Evaluation of Sympathetic Nervous System and Perfusion in Normal and Spontaneously Hypertensive Rat Hearts with Dynamic Single-Photon Emission Computed Tomography.
  Molecular imaging 2015 Zan Y, Boutchko R, Huang Q, Li B, Chen K, Gullberg GT
• Handling Big Data in Medical Imaging: Iterative Reconstruction with Large-Scale Automated Parallel Computation.
  IEEE Nuclear Science Symposium conference record. Nuclear Science Symposium 2014 Lee JH, Yao Y, Shrestha U, Gullberg GT, Seo Y
• Multipinhole collimator with 20 apertures for a brain SPECT application.
  Medical physics 2014 Lee TC, Ellin JR, Huang Q, Shrestha U, Gullberg GT, Seo Y
• Quantitative Signature of Coronary Steal in a Patient with Occluded Coronary Arteries Supported by Collateral Circulation Using Dynamic SPECT.
  IEEE Nuclear Science Symposium conference record. Nuclear Science Symposium 2014 Shrestha U, Botvinick EH, Yeghiazarians Y, Seo Y, Gullberg GT
• Reconstruction of 4-D dynamic SPECT images from inconsistent projections using a Spline initialized FADS algorithm (SIFADS).
  IEEE transactions on medical imaging 2014 Abdalah M, Boutchko R, Mitra D, Gullberg GT
• Improved trabecular bone structure of 20-month-old male spontaneously hypertensive rats.
  Calcified tissue international 2014 Lee TC, Burghardt AJ, Yao W, Lane NE, Majumdar S, Gullberg GT, Seo Y
• Preclinical and Translational PET/MR Imaging.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2014 Wehrl HF, Wiehr S, Divine MR, Gatidis S, Gullberg GT, Maier FC, Rolle AM, Schwenck J, Thaiss WM, Pichler BJ
• Myocardial blood flow measurement with a conventional dual-head SPECT/CT with spatiotemporal iterative reconstructions - a clinical feasibility study.
  American journal of nuclear medicine and molecular imaging 2013 Alhassen F, Nguyen N, Bains S, Gould RG, Seo Y, Bacharach SL, Song X, Shao L, Gullberg GT, Aparici CM
• Longitudinal evaluation of left ventricular substrate metabolism, perfusion, and dysfunction in the spontaneously hypertensive rat model of hypertrophy using small-animal PET/CT imaging.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2013 Hernandez AM, Huber JS, Murphy ST, Janabi M, Zeng GL, Brennan KM, O'Neil JP, Seo Y, Gullberg GT
• Design and performance evaluation of a 20-aperture multipinhole collimator for myocardial perfusion imaging applications.
  Physics in medicine and biology 2013 Bowen JD, Huang Q, Ellin JR, Lee TC, Shrestha U, Gullberg GT, Seo Y
• Fast direct estimation of the blood input function and myocardial time activity curve from dynamic SPECT projections via reduction in spatial and temporal dimensions.
  Medical physics 2013 Zan Y, Boutchko R, Huang Q, Li B, Chen K, Gullberg GT
• A Comparison of Hyperelastic Warping of PET Images with Tagged MRI for the Analysis of Cardiac Deformation.
  International journal of biomedical imaging 2013 Veress AI, Klein G, Gullberg GT
• Left ventricular finite element model bounded by a systemic circulation model.
  Journal of biomechanical engineering 2013 Veress AI, Raymond GM, Gullberg GT, Bassingthwaighte JB
• Practical implementation of tetrahedral mesh reconstruction in emission tomography.
  Physics in medicine and biology 2013 Boutchko R, Sitek A, Gullberg GT
• A detector response function design in pinhole SPECT including geometrical calibration.
  Physics in medicine and biology 2013 El Bitar Z, Huesman RH, Boutchko R, Bekaert V, Brasse D, Gullberg GT
• On the bias of finite-view interior tomography using piecewise-constant and non-negativity constraints.
  Physics in medicine and biology 2013 Zeng GL, Gullberg GT
• Fourier domain closed-form formulas for estimation of kinetic parameters in reversible multi-compartment models.
  Biomedical engineering online 2012 Zeng GL, Kadrmas DJ, Gullberg GT
• Kinetic parameter estimation using a closed-form expression via integration by parts.
  Physics in medicine and biology 2012 Zeng GL, Hernandez A, Kadrmas DJ, Gullberg GT
• Null-space function estimation for the interior problem.
  Physics in medicine and biology 2012 Zeng GL, Gullberg GT
• Imaging and modeling of flow in porous media using clinical nuclear emission tomography systems and computational fluid dynamics.
  Journal of applied geophysics 2012 Boutchko R, Rayz VL, Vandehey NT, O'Neil JP, Budinger TF, Nico PS, Druhan JL, Saloner DA, Gullberg GT, Moses WW
• Investigation of dynamic SPECT measurements of the arterial input function in human subjects using simulation, phantom and human studies.
  Physics in medicine and biology 2011 Winant CD, Aparici CM, Zelnik YR, Reutter BW, Sitek A, Bacharach SL, Gullberg GT
• Development of a model of the coronary arterial tree for the 4D XCAT phantom.
  Physics in medicine and biology 2011 Fung GS, Segars WP, Gullberg GT, Tsui BM
• MR-based keyhole SPECT for small animal imaging.
  Physics in medicine and biology 2011 Lee KS, Roeck WW, Gullberg GT, Nalcioglu O
• Longitudinal Evaluation of Fatty Acid Metabolism in Normal and Spontaneously Hypertensive Rat Hearts with Dynamic MicroSPECT Imaging.
  International journal of molecular imaging 2010 Reutter BW, Huesman RH, Brennan KM, Boutchko R, Hanrahan SM, Gullberg GT
• Closed-form kinetic parameter estimation solution to the truncated data problem.
  Physics in medicine and biology 2010 Zeng GL, Gullberg GT, Kadrmas DJ
• Incorporation of a left ventricle finite element model defining infarction into the XCAT imaging phantom.
  IEEE transactions on medical imaging 2010 Veress AI, Segars WP, Tsui BM, Gullberg GT
• Realistic Simulation of Regional Myocardial Perfusion Defects for Cardiac SPECT Studies.
  IEEE Nuclear Science Symposium conference record. Nuclear Science Symposium 2010 Fung GS, Segars WP, Lee TS, Higuchi T, Veress AI, Gullberg GT, Tsui BM
• Dynamic single photon emission computed tomography--basic principles and cardiac applications.
  Physics in medicine and biology 2010 Gullberg GT, Reutter BW, Sitek A, Maltz JS, Budinger TF
• SPECT region of interest reconstruction with truncated transmission and emission data.
  Medical physics 2010 Zeng GL, Gullberg GT
• Exact iterative reconstruction for the interior problem.
  Physics in medicine and biology 2009 Zeng GL, Gullberg GT
• Reconstructing uniformly attenuated rotating slant-hole SPECT projection data using the DBH method.
  Physics in medicine and biology 2009 Huang Q, Xu J, Tsui BM, Gullberg GT
• Exact emission SPECT reconstruction with truncated transmission data.
  Physics in medicine and biology 2009 Zeng GL, Gullberg GT
• Reconstruction from uniformly attenuated SPECT projection data using the DBH method.
  IEEE transactions on medical imaging 2009 Huang Q, You J, Zeng GL, Gullberg GT
• Measuring regional changes in the diastolic deformation of the left ventricle of SHR rats using microPET technology and hyperelastic warping.
  Annals of biomedical engineering 2008 Veress AI, Weiss JA, Huesman RH, Reutter BW, Taylor SE, Sitek A, Feng B, Yang Y, Gullberg GT
• Assessment of the sources of error affecting the quantitative accuracy of SPECT imaging in small animals.
  Physics in medicine and biology 2008 Hwang AB, Franc BL, Gullberg GT, Hasegawa BH
• Reconstruction and visualization of fiber and laminar structure in the normal human heart from ex vivo diffusion tensor magnetic resonance imaging (DTMRI) data.
  Investigative radiology 2007 Rohmer D, Sitek A, Gullberg GT
• A Fourier reconstruction algorithm with constant attenuation compensation using 180 degrees acquisition data for SPECT.
  Physics in medicine and biology 2007 Tang Q, Zeng GL, Gullberg GT
• Normal and pathological NCAT image and phantom data based on physiologically realistic left ventricle finite-element models.
  IEEE transactions on medical imaging 2006 Veress AI, Segars WP, Weiss JA, Tsui BM, Gullberg GT
• Tomographic reconstruction using an adaptive tetrahedral mesh defined by a point cloud.
  IEEE transactions on medical imaging 2006 Sitek A, Huesman RH, Gullberg GT
• Method of generating multiple sets of experimental phantom data.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2006 Sitek A, Reutter BW, Huesman RH, Gullberg GT
• Image reconstruction.
  Physics in medicine and biology 2006 Defrise M, Gullberg GT
• Measurement of strain in the left ventricle during diastole with cine-MRI and deformable image registration.
  Journal of biomechanical engineering 2005 Veress AI, Gullberg GT, Weiss JA
• Exact fan-beam and 4pi-acquisition cone-beam SPECT algorithms with uniform attenuation correction.
  Medical physics 2005 Tang Q, Zeng GL, Wu J, Gullberg GT
• Analytical fan-beam and cone-beam reconstruction algorithms with uniform attenuation correction for SPECT.
  Physics in medicine and biology 2005 Tang Q, Zeng GL, Gullberg GT
• An FDK-like cone-beam SPECT reconstruction algorithm for non-uniform attenuated projections acquired using a circular trajectory.
  Physics in medicine and biology 2005 Huang Q, Zeng GL, You J, Gullberg GT
• Cone-beam and fan-beam image reconstruction algorithms based on spherical and circular harmonics.
  Physics in medicine and biology 2004 Zeng GL, Gullberg GT
• MRI diffusion tensor reconstruction with PROPELLER data acquisition.
  Magnetic resonance imaging 2004 Cheryauka AB, Lee JN, Samsonov AA, Defrise M, Gullberg GT
• Strain measurement in coronary arteries using intravascular ultrasound and deformable images.
  Journal of biomechanical engineering 2002 Veress AI, Weiss JA, Gullberg GT, Vince DG, Rabbitt RD
• Diffusion tensor MR imaging of principal directions: a tensor tomography approach.
  Physics in medicine and biology 2002 Panin VY, Zeng GL, Defrise M, Gullberg GT
• Effects of temporal modelling on the statistical uncertainty of spatiotemporal distributions estimated directly from dynamic SPECT projections.
  Physics in medicine and biology 2002 Reutter BW, Gullberg GT, Huesman RH
• Calculation of the left ventricular ejection fraction without edge detection: application to small hearts.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2002 Feng B, Sitek A, Gullberg GT
• Correction for ambiguous solutions in factor analysis using a penalized least squares objective.
  IEEE transactions on medical imaging 2002 Sitek A, Gullberg GT, Huesman RH
• Removal of liver activity contamination in teboroxime dynamic cardiac SPECT imaging with the use of factor analysis.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 2002 Sitek A, Di Bella EV, Gullberg GT, Huesman RH
• Reconstruction of dynamic renal tomographic data acquired by slow rotation.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2001 Sitek A, Gullberg GT, Di Bella EV, Celler A
• Mortality, morbidity, and assessment of fracture risk in male osteoporosis.
  Calcified tissue international 2001 Johnell O, Kanis J, Gullberg G
• Estimation of coronary flow reserve: can SPECT compete with other modalities?
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 2001 Gullberg GT, Di Bella EV, Sinusas AJ
• Comparison of Static and Dynamic Cardiac Perfusion Thallium-201 SPECT.
  IEEE transactions on nuclear science 2001 Khare HS, Dibella EV, Kadrmas DJ, Christian PE, Gullberg GT
• Cone-beam image reconstruction using spherical harmonics.
  Physics in medicine and biology 2001 Taguchi K, Zeng GL, Gullberg GT
• 4D maximum a posteriori reconstruction in dynamic SPECT using a compartmental model-based prior.
  Physics in medicine and biology 2001 Kadrmas DJ, Gullberg GT
• Efficient cardiac diffusion tensor MRI by three-dimensional reconstruction of solenoidal tensor fields.
  Magnetic resonance imaging 2001 Gullberg GT, Defrise M, Panin VY, Zeng GL
• A three-dimensional ray-driven attenuation, scatter and geometric response correction technique for SPECT in inhomogeneous media.
  Physics in medicine and biology 2000 Laurette I, Zeng GL, Welch A, Christian PE, Gullberg GT
• Factor analysis with a priori knowledge--application in dynamic cardiac SPECT.
  Physics in medicine and biology 2000 Sitek A, Di Bella EV, Gullberg GT
• SPECT Imaging of Teboroxime during Myocardial Blood Flow Changes.
  IEEE transactions on nuclear science 2000 Di Bella EV, Khare HS, Kadrmas DJ, Gullberg GT
• Static Versus Dynamic Teboroxime Myocardial Perfusion SPECT in Canines.
  IEEE transactions on nuclear science 2000 Kadrmas DJ, Di Bella EV, Khare HS, Christian PE, Gullberg GT
• A slice-by-slice blurring model and kernel evaluation using the Klein-Nishina formula for 3D scatter compensation in parallel and converging beam SPECT.
  Physics in medicine and biology 2000 Bai C, Zeng GL, Gullberg GT
• Direct least-squares estimation of spatiotemporal distributions from dynamic SPECT projections using a spatial segmentation and temporal B-splines.
  IEEE transactions on medical imaging 2000 Reutter BW, Gullberg GT, Huesman RH
• Unmatched projector/backprojector pairs in an iterative reconstruction algorithm.
  IEEE transactions on medical imaging 2000 Zeng GL, Gullberg GT
• A projector/backprojector with slice-to-slice blurring for efficient three-dimensional scatter modeling.
  IEEE transactions on medical imaging 1999 Zeng GL, Bai C, Gullberg GT
• Analytical propagation of errors in dynamic SPECT: estimators, degrading factors, bias and noise.
  Physics in medicine and biology 1999 Kadrmas DJ, DiBella EV, Huesman RH, Gullberg GT
• Blind estimation of compartmental model parameters.
  Physics in medicine and biology 1999 Di Bella EV, Clackdoyle R, Gullberg GT
• Quantitative myocardial perfusion SPECT.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 1998 Tsui BM, Frey EC, LaCroix KJ, Lalush DS, McCartney WH, King MA, Gullberg GT
• Innovative design concepts for transmission CT in attenuation-corrected SPECT imaging.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1998 Gullberg GT
• No impaired cognitive function in treated patients with mild-moderate hypertension compared to normotensive controls.
  Blood pressure 1998 Nilsson P, Gullberg G, Ekesbo R, Von Schenck H, Gustafson L
• Application of spherical harmonics to image reconstruction for the Compton camera.
  Physics in medicine and biology 1998 Basko R, Zeng GL, Gullberg GT
• Improved estimation of the detector response function for converging beam collimators.
  Physics in medicine and biology 1998 Frey EC, Tsui BM, Gullberg GT
• Iterative and analytical reconstruction algorithms for varying-focal-length cone-beam projections.
  Physics in medicine and biology 1998 Zeng GL, Gullberg GT
• Kinetic parameter estimation from SPECT cone-beam projection measurements.
  Physics in medicine and biology 1998 Huesman RH, Reutter BW, Zeng GL, Gullberg GT
• Projection space image reconstruction using strip functions to calculate pixels more "natural" for modeling the geometric response of the SPECT collimator.
  IEEE transactions on medical imaging 1998 Hsieh YL, Zeng GL, Gullberg GT
• Effect of truncated projections on defect detection in attenuation-compensated fanbeam cardiac SPECT.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1998 Gregoriou GK, Tsui BM, Gullberg GT
• Iterative reconstruction of fluorine-18 SPECT using geometric point response correction.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1998 Zeng GL, Gullberg GT, Bai C, Christian PE, Trisjono F, Di Bella EV, Tanner JW, Morgan HT
• Implementation of a model-based nonuniform scatter correction scheme for SPECT.
  IEEE transactions on medical imaging 1997 Welch A, Gullberg GT
• An investigation into the effect of input function shape and image acquisition interval on estimates of washin for dynamic cardiac SPECT.
  Physics in medicine and biology 1997 Ross SG, Welch A, Gullberg GT, Huesman RH
• Toward accurate attenuation correction in SPECT without transmission measurements.
  IEEE transactions on medical imaging 1997 Welch A, Clack R, Natterer F, Gullberg GT
• Reduction of geometric and intensity distortions in echo-planar imaging using a multireference scan.
  Magnetic resonance in medicine 1997 Wan X, Gullberg GT, Parker DL, Zeng GL
• Experimental verification of technetium 99m-labeled teboroxime kinetic parameters in the myocardium with dynamic single-photon emission computed tomography: reproducibility, correlation to flow, and susceptibility to extravascular contamination.
  Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology 1996 Smith AM, Gullberg GT, Christian PE
• An investigation of the effect of finite system resolution and photon noise on the bias and precision of dynamic cardiac SPECT parameters.
  Medical physics 1995 Welch A, Smith AM, Gullberg GT
• A transmission-map-based scatter correction technique for SPECT in inhomogeneous media.
  Medical physics 1995 Welch A, Gullberg GT, Christian PE, Datz FL, Morgan HT
• Reduction of phase error ghosting artifacts in thin slice fast spin-echo imaging.
  Magnetic resonance in medicine 1995 Wan X, Parker DL, Lee JN, Buswell HR, Gullberg GT
• Magnetic resonance imaging verification of a multi-compartment perfusion model for a chromatography gel phantom.
  Magnetic resonance imaging 1995 Ma X, Gullberg GT, Parker DL
• A simulation of emission and transmission noise propagation in cardiac SPECT imaging with nonuniform attenuation correction.
  Medical physics 1994 Tung CH, Gullberg GT
• Tuning and matching networks for MR imaging and spectroscopy.
  Journal of magnetic resonance imaging : JMRI 1994 Viohl I, Gullberg GT
• Implementation of Tuy's cone-beam inversion formula.
  Physics in medicine and biology 1994 Zeng GL, Clack R, Gullberg GT
• Kinetic modeling of teboroxime using dynamic SPECT imaging of a canine model.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1994 Smith AM, Gullberg GT, Christian PE, Datz FL
• A backprojection filtering algorithm for a spatially varying focal length collimator.
  IEEE transactions on medical imaging 1994 Zeng GL, Gullberg GT
• A cone beam SPECT reconstruction algorithm with a displaced center of rotation.
  Medical physics 1994 Li J, Jaszczak RJ, Wang H, Gullberg GT, Greer KL, Coleman RE
• Application of convergent-beam collimation and simultaneous transmission emission tomography to cardiac single-photon emission computed tomography.
  Seminars in nuclear medicine 1994 Datz FL, Gullberg GT, Zeng GL, Tung CH, Christian PE, Welch A, Clack R
• Evaluation of cardiac cone-beam single photon emission computed tomography using observer performance experiments and receiver operating characteristic analysis.
  Investigative radiology 1993 Tsui BM, Terry JA, Gullberg GT
• The use of computer-assisted diagnosis in cardiac perfusion nuclear medicine studies: a review (Part 3)
  Journal of digital imaging 1993 Datz FL, Rosenberg C, Gabor FV, Christian PE, Gullberg GT, Ahluwalia R, Morton KA
• The use of computer-assisted diagnosis in cardiac perfusion nuclear medicine studies: a review (Part 2).
  Journal of digital imaging 1993 Datz FL, Gabor FV, Christian PE, Gullberg GT, Menzel CE, Morton KA
• Fan-beam reconstruction algorithm for a spatially varying focal length collimator.
  IEEE transactions on medical imaging 1993 Zeng GL, Gullberg GT, Jaszczak RJ, Li J
• The use of computer-assisted diagnosis in cardiac-perfusion nuclear medicine studies: a review.
  Journal of digital imaging 1992 Datz FL, Gabor FV, Christian PE, Gullberg GT, Menzel CE, Morton KA
• A cone-beam tomography algorithm for orthogonal circle-and-line orbit.
  Physics in medicine and biology 1992 Zeng GL, Gullberg GT
• Review of convergent beam tomography in single photon emission computed tomography.
  Physics in medicine and biology 1992 Gullberg GT, Zeng GL, Datz FL, Christian PE, Tung CH, Morgan HT
• A cone-beam filtered backprojection reconstruction algorithm for cardiac single photon emission computed tomography.
  IEEE transactions on medical imaging 1992 Gullberg GT, Zeng GL
• Cone beam tomography of the heart using single-photon emission-computed tomography.
  Investigative radiology 1991 Gullberg GT, Christian PE, Zeng GL, Datz FL, Morgan HT
• SPECT myocardial perfusion imaging update.
  Seminars in ultrasound, CT, and MR 1991 Datz FL, Gullberg G, Gabor FV, Morton KA
• An MRI perfusion model incorporating nonequilibrium exchange between vascular and extravascular compartments.
  Magnetic resonance imaging 1991 Gullberg GT, Ma X, Parker DL, Roy DN
• Single photon emission computed tomography of the heart using cone beam geometry and noncircular detector rotation.
  Progress in clinical and biological research 1991 Gullberg GT, Zeng GS, Christian PE, Tsui BM, Morgan HT
• Estimation of geometrical parameters and collimator evaluation for cone beam tomography.
  Medical physics 1990 Gullberg GT, Tsui BM, Crawford CR, Ballard JG, Hagius JT
• Signal-to-noise efficiency in magnetic resonance imaging.
  Medical physics 1990 Parker DL, Gullberg GT
• The geometric transfer function for cone and fan beam collimators.
  Physics in medicine and biology 1990 Tsui BM, Gullberg GT
• Correction of nonuniform attenuation in cardiac SPECT imaging.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1989 Tsui BM, Gullberg GT, Edgerton ER, Ballard JG, Perry JR, McCartney WH, Berg J
• Flow-induced phase effects and compensation technique for slice-selective pulses.
  Magnetic resonance in medicine 1989 Yuan C, Gullberg GT, Parker DL
• A mathematical model for signal from spins flowing during the application of spin echo pulse sequences.
  Magnetic resonance imaging 1988 Gullberg GT, Simons MA, Wehrli FW
• Noise characteristics for cone beam collimators: a comparison with parallel hole collimator.
  Physics in medicine and biology 1988 Hahn LJ, Jaszczak RJ, Gullberg GT, Floyd CE, Manglos SH, Greer KL, Coleman RE
• Convolutional reconstruction algorithm for fan beam concave and convex circular detectors.
  IEEE transactions on medical imaging 1988 Hu H, Gullberg GT, Kruger RA
• Reconstruction for fan beam with an angular-dependent displaced center-of-rotation.
  Medical physics 1988 Crawford CR, Gullberg GT, Tsui BM
• The solution of Bloch equations for flowing spins during a selective pulse using a finite difference method.
  Medical physics 1987 Yuan C, Gullberg GT, Parker DL
• MR vascular imaging with a fast gradient refocusing pulse sequence and reformatted images from transaxial sections.
  Radiology 1987 Gullberg GT, Wehrli FW, Shimakawa A, Simons MA
• Gibbs artifact removal in magnetic resonance imaging.
  Medical physics 1987 Parker DL, Gullberg GT, Frederick PR
• An analytical approach to quantify uniformity artifacts for circular and noncircular detector motion in single photon emission computed tomography imaging.
  Medical physics 1987 Gullberg GT
• Time-of-flight MR flow imaging: selective saturation recovery with gradient refocusing.
  Radiology 1986 Wehrli FW, Shimakawa A, Gullberg GT, MacFall JR
• Design and clinical utility of a fan beam collimator for SPECT imaging of the head.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1986 Tsui BM, Gullberg GT, Edgerton ER, Gilland DR, Perry JR, McCartney WH
• SPECT liver imaging using an iterative attenuation correction algorithm and an external flood source.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1986 Malko JA, Van Heertum RL, Gullberg GT, Kowalsky WP
• Reconstruction Algorithm for Fan Beam with a Displaced Center-of-Rotation.
  IEEE transactions on medical imaging 1986 Gullberg GT, Crawford CR, Tsui BM
• An attenuated projector-backprojector for iterative SPECT reconstruction.
  Physics in medicine and biology 1985 Gullberg GT, Huesman RH, Malko JA, Pelc NJ, Budinger TF
• A count-based algorithm for attenuation-corrected volume determination using data from an external flood source.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1985 Malko JA, Gullberg GT, Kowalsky WP, Van Heertum RL
• Regional distribution of myocardial blood flow measured by single-photon emission tomography: comparison with in vitro counting.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1982 Caldwell JH, Williams DL, Hamilton GW, Ritchie JL, Harp GD, Eisner RL, Gullberg GT, Nowak DJ
• The use of filtering methods to compensate for constant attenuation in single-photon emission computed tomography.
  IEEE transactions on bio-medical engineering 1981 Gullberg GT, Budinger TF
• Quantitative potentials of dynamic emission computed tomography.
  Journal of nuclear medicine : official publication, Society of Nuclear Medicine 1978 Budinger TF, Derenzo SE, Greenberg WL, Gullberg GT, Huesman RH
• Three dimensional imaging of the myocardium with radionuclides.
  Radiology 1977 Budinger TF, Cahoon JL, Derenzo SE, Gullberg GT, Moyer BR, Yano Y
• Emission computer assisted tomography with single-photon and positron annihilation photon emitters.
  Journal of computer assisted tomography 1977 Budinger TF, Derenzo SE, Gullberg GT, Greenberg WL, Huesman RH
• Letter: Three-dimensional reconstruction of isotope distributions.
  Physics in medicine and biology 1974 Budinger TF, Gullberg GT