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Rizwan Ahmad

  • Assistant Professor, Electrical & Computer Engr.
  • Assistant Professor, Biomedical Engineering
  • 1080 Carmack Rd
    Columbus, OH 43210

About

Education

  • B.S., University of Engineering and Technology, Lahore, Pakistan, 2000
  • M.S., The Ohio State University, 2004
  • Ph.D., The Ohio State University, 2007

Key Honors and Distinctions

  • 2007--Travel award for EPR Conference, Breckenridge, CO
  • 2011--Lumley Interdisciplinary Research Award by College of Engineering, OSU
  • 2014--Distinguished reviewer for the journal of Magnetic Resonance in Medicine
  • 2015--Distinguished reviewer for the journal of Magnetic Resonance in Medicine
  • 2016--Abstract on multi-directional phase-contrast MRI selected for “power-pitch” presentation at 2016 ISMRM (only 2.7% of the abstracts selected)
  • 2017--Lumley Research Award by College of Engineering, Ohio State University
  • 2017--Invited reviewer for NIH BMIT-A study section

Research Areas

  • Medical Imaging Lab (coming soon at www.medi.osu.edu)
  • Bioimaging, cardiovascular imaging, magnetic resonance imaging, signal processing, ischemic heart disease, vavular disease

                                                             

  • Publications

https://scholar.google.com/citations?user=9mbdAO4AAAAJ&hl=enhttps://scholar.google.com/citations?user=9mbdAO4AAAAJ&hl=en

  • Patents

• R. Ahmad (lead inventor), J. Ash, N. Jin, L.C. Potter, A.V. Rich, and O.P. Simonetti, A Bayesian Model for Highly Accelerated Phase-Contrast MRI, Application Number: 15/160,083, Status: utility/published

• R. Ahmad (lead inventor) and A. Kolipaka. Methods for Co-Imaging Tissue Stiffness and Blood Flow in an MRI scan, Application Number: 15/598,661, Status: utility/pending

• OP Simonetti, R. Ahmad, Lee C. Potter, Juliet Varghese, A Magnetic Resonance Imaging Method to Non-Invasively Measure Blood Oxygen Saturation , Application Number: 15/416,249, Status: utility/published

• R. Ahmad (lead inventor), Y. Ding, O.P. Simonetti, Variable Density Incoherent Constrained Sampling (VICS) for Highly Accelerated Magnetic Resonance Imaging, Application Number: 14/593,322, Status: utility/published

• R. Ahmad (lead inventor), Y. Ding, N. Jin, and O.P. Simonetti, Direct Inversion for Phase-Based Dynamic Magnetic Resonance Measurement, Application Number: 14/258,268, Status: utility/published

• R. Ahmad (lead inventor), N. Jin, and O. P. Simonetti, Background Phase Correction for Quantitative Cardiovascular MRI, Application Number: 14/918,184, Status: utility/pending

• R. Ahmad (lead inventor), O.P. Simonetti, L.C. Potter, A. Rich, and S. Ting, Low-Field MRI Scanner for Cardiac Imaging, Application Number: 15/013,316, Status: utility/pending

• Y. Ding, R. Ahmad, O.P. Simonetti, S. Ting, H. Xue, Self-Constraint Non-Iterative GRAPPA Reconstruction with Closed-Form Solution, Application Number: 13/803,536, Status: utility/issued

 

Dr. Ahmad is interested in bringing engineering innovations to advance the clinical practice of biomedical imaging. His research is particularly focused on developing new data acquisition and processing methods that can improve diagnostic accuracy of existing imaging applications or enable new applications. His research expertise encompasses digital signal processing, tomographic reconstruction, mathematical modeling, linear and nonlinear inverse problems, optimization, and biomedical instrumentation, with application to magnetic resonance imaging (MRI). He is particularly interested in developing cardiac MRI techniques for evaluating cardiovascular disease, including ischemic heart disease and valvular disease.

Honors

  • October, 2018

    Second-position for Chen Chong (post-doc) in DHLRI Research Day.

  • April, 2017

    Power pitch (awarded to top 2.7% abstracts).

  • April, 2017

    Lumley Research Award.

  • February, 2016

    Power pitch (awarded to top 2.7% abstracts).

  • June, 2015

    Show and Tell (top 10% of the conference papers).

  • May, 2015

    Distinguished reviewer.

  • February, 2015

    Power pitch (awarded to top 2.7% abstracts).

  • May, 2014

    Distinguished reviewer.

  • October, 2012

    Poster competition at annual research retreat (1st place).

  • April, 2011

    Lumley Interdisciplinary Research Award.

  • October, 2009

    Poster competition at annual research retreat (2nd place).

  • April, 2005

    Young researcher award.

  • December, 2000

    Top-ten student in the department.

Chapters

2017

  • 2017. "Recovering Signals with Unknown Sparsity in Multiple Dictionaries." In Compressed Sensing and its Applications. Applied and Numerical Harmonic Analysis, edited by Boche, H.; Caire, G.; Calderbank, R.; März, M.; Kutyniok, G.; Mathar, R.,

2011

  • Ahmad, R.; Kuppusmay, P.. 2011. "EPR Imaging: Theory and Instrumentation." edited by Misra, S.K.,

2010

  • Ahmad, R.; Khan, M.; Vikram, D.S.; Bratasz, A. et al.. 2010. "EPR Oximetry: Method and Application." edited by Das, D.K.,

Journal Articles

2018

  • Ebersole, C.; Ahmad, R.; Rich, A.V.; Potter, L.C. et al., 2018, "A bayesian method for accelerated magnetic resonance elastography of the liver." Magnetic Resonance in Medicine
  • Ahmad, R.; Hu, H.H.; Krishnamurthy, R.; Krishnamurthy, R., 2018, "Reducing sedation for pediatric body MRI using accelerated and abbreviated imaging protocols.." Pediatric radiology 48, no. 1, 37-49 - 37-49.

2017

  • da Silveira, J.S.; Smyke, M.; Rich, A.V.; Liu, Y. et al., 2017, "Quantification of aortic stenosis diagnostic parameters: comparison of fast 3 direction and 1 direction phase contrast CMR and transthoracic echocardiography.." Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance 19, no. 1, 35 - 35.
  • Varghese, J.; Potter, L.C.; LaFountain, R.; Pan, X. et al., 2017, "CMR-based blood oximetry via multi-parametric estimation using multiple T2 measurements.." Journal of cardiovascular magnetic resonance : official journal of the Society for Cardiovascular Magnetic Resonance 19, no. 1, 88 - 88.
  • Simonetti, O.P.; Ahmad, R., 2017, "Low-Field Cardiac Magnetic Resonance Imaging: A Compelling Case for Cardiac Magnetic Resonance's Future.." Circulation. Cardiovascular imaging 10, no. 6,

2016

  • Ahmad, R.; Samouilov, A.; Zweier, J.L., 2016, "Accelerated dynamic EPR imaging using fast acquisition and compressive recovery.." Journal of magnetic resonance (San Diego, Calif. : 1997) 273, 105-112 - 105-112.

2015

  • Ahmad, R.; Ding, Y.; Simonetti, O.P., 2015, "Edge Sharpness Assessment by Parametric Modeling: Application to Magnetic Resonance Imaging.." Concepts in magnetic resonance. Part A, Bridging education and research 44, no. 3, 138-149 - 138-149.

2013

  • Golub, F.; Potter, L.C.; Ash, J.N.; Blank, A. et al., 2013, "Estimation of spin-echo relaxation time.." Journal of magnetic resonance (San Diego, Calif. : 1997) 237, 17-22 - 17-22.

2012

  • Palmer, J.; Potter, L.C.; Johnson, D.H.; Zweier, J.L. et al., 2012, "Dual-scan acquisition for accelerated continuous-wave EPR oximetry.." Journal of magnetic resonance (San Diego, Calif. : 1997) 222, 53-58 - 53-58.
  • Ahmad, R.; Potter, L.C.; Khramtsov, V.V., 2012, "Spectral modeling for accelerated pH spectroscopy using EPR.." Journal of magnetic resonance (San Diego, Calif. : 1997) 218, 86-92 - 86-92.
  • Ahmad, R.; Som, S.; Johnson, D.H.; Zweier, J.L. et al., 2012, "Multisite EPR oximetry from multiple quadrature harmonics.." Journal of magnetic resonance (San Diego, Calif. : 1997) 214, no. 1, 135-143 - 135-143.

2011

  • Palmer, J.; Potter, L.C.; Ahmad, R., 2011, "Optimization of magnetic field sweep and field modulation amplitude for continuous-wave EPR oximetry.." Journal of magnetic resonance (San Diego, Calif. : 1997) 209, no. 2, 337-340 - 337-340.

2010

  • Ahmad, R.; Som, S.; Kesselring, E.; Kuppusamy, P. et al., 2010, "Digital detection and processing of multiple quadrature harmonics for EPR spectroscopy.." Journal of magnetic resonance (San Diego, Calif. : 1997) 207, no. 2, 322-331 - 322-331.
  • Ahmad, R.; Caia, G.; Potter, L.C.; Petryakov, S. et al., 2010, "In vivo multisite oximetry using EPR-NMR coimaging.." Journal of magnetic resonance (San Diego, Calif. : 1997) 207, no. 1, 69-77 - 69-77.

2008

  • Vikram, D.S.; Ahmad, R.; Rivera, B.K.; Kuppusamy, P., 2008, "Mapping of oxygen concentration in biological samples using EPR imaging." Israel Journal of Chemistry 48, no. 1,
  • Ahmad, R.; Vikram, D.S.; Potter, L.C.; Kuppusamy, P., 2008, "Estimation of mean and median pO2 values for a composite EPR spectrum.." Journal of magnetic resonance (San Diego, Calif. : 1997) 192, no. 2, 269-274 - 269-274.
  • Som, S.; Potter, L.C.; Ahmad, R.; Vikram, D.S. et al., 2008, "EPR oximetry in three spatial dimensions using sparse spin distribution.." Journal of magnetic resonance (San Diego, Calif. : 1997) 193, no. 2, 210-217 - 210-217.

2007

  • Ahmad, R.; Deng, Y.; Vikram, D.S.; Clymer, B. et al., 2007, "Quasi Monte Carlo-based isotropic distribution of gradient directions for improved reconstruction quality of 3D EPR imaging.." Journal of magnetic resonance (San Diego, Calif. : 1997) 184, no. 2, 236-245 - 236-245.
  • Ahmad, R.; Clymer, B.; Vikram, D.S.; Deng, Y. et al., 2007, "Enhanced resolution for EPR imaging by two-step deblurring.." Journal of magnetic resonance (San Diego, Calif. : 1997) 184, no. 2, 246-257 - 246-257.
  • Som, S.; Potter, L.C.; Ahmad, R.; Kuppusamy, P., 2007, "A parametric approach to spectral-spatial EPR imaging.." Journal of magnetic resonance (San Diego, Calif. : 1997) 186, no. 1, 1-10 - 1-10.
  • Ahmad, R.; Vikram, D.S.; Clymer, B.; Potter, L.C. et al., 2007, "Uniform distribution of projection data for improved reconstruction quality of 4D EPR imaging.." Journal of magnetic resonance (San Diego, Calif. : 1997) 187, no. 2, 277-287 - 277-287.

2006

  • Ahmad, R.; Vikram, D.S.; Petryakov, S.; Deng, Y. et al., 2006, "Automated on-the-fly detection and correction procedure for EPR imaging data acquisition.." Magnetic resonance in medicine 56, no. 3, 644-653 - 644-653.
  • Deng, Y.; Pandian, R.P.; Ahmad, R.; Kuppusamy, P. et al., 2006, "Application of magnetic field over-modulation for improved EPR linewidth measurements using probes with Lorentzian lineshape.." Journal of magnetic resonance (San Diego, Calif. : 1997) 181, no. 2, 254-261 - 254-261.
  • Ahmad, R.; Clymer, B.; Deng, Y.; He, G. et al., 2006, "Optimization of data acquisition for EPR imaging.." Journal of magnetic resonance (San Diego, Calif. : 1997) 179, no. 2, 263-272 - 263-272.

Presentations

  • "Accelerated Cardiac MRI." 2016, Presented at Meeting with GE MRI Research Team,

Papers in Proceedings

2019

  • Bush, M.A.; Ahmad, R.; Jin, N.; Liu, Y. et al. "Patient specific prospective respiratory motion correction for efficient, free-breathing cardiovascular MRI." (1 2019).
  • Bush, M.A.; Ahmad, R.; Jin, N.; Liu, Y. et al. "Patient specific prospective respiratory motion correction for efficient, free-breathing cardiovascular MRI.." (2 2019).
  • Bush, M.A.; Ahmad, R.; Jin, N.; Liu, Y. et al. "Patient specific prospective respiratory motion correction for efficient, free-breathing cardiovascular MRI.." (2 2019).

2018

  • Chen, C.; Liu, Y.; Simonetti, O.; Ahmad, R. "Reconstructing real-time exercise stress cine images with multiple sets of sensitivity maps." (1 2018).
  • Pruitt, A.; Jin, N.; Liu, Y.; Simonetti, O. et al. "Background phase correction in the presence wrap-around artifact: Application in 4D flow imaging." (1 2018).
  • Rich, A.; Jin, N.; Liu, Y.; Potter, L. et al. "CArtesian sampling with Variable density and Adjustable temporal resolution (CAVA)." (1 2018).
  • Dong, H.; Ahmad, R.; Kolipaka, A. "Helmholtz Inversion Using Unconstrained Optimization for MR Elastography." (1 2018).
  • Varghese, J.; Desai, L.; Ahmad, R.; Potter, L.C. et al. "Non-invasive MR-based blood oximetry via multi-parametric, non-linear estimation: initial multi-center experience in adult and pediatric patients." (1 2018).
  • Varghese, J.; Ahmad, R.; Raman, S.; Potter, L. et al. "Non-invasive quantitative estimation of blood oxygen saturation with MRI: feasibility of machine learning." (1 2018).
  • Zhao, S.; Potter, L.; Jin, N.; Liu, Y. et al. "PC-MRI with Phase Recovery from Multiple Wrapped Measurements (PRoM)." (1 2018).
  • Bush, M.; Ahmad, R.; Liu, Y.; Jin, N. et al. "Prospective correction of patient-specific respiratory motion in T1 and T2 mapping." (1 2018).
  • Rich, A.; Ahmad, R. "MR Image Reconstruction via Denoising (MR-RED)." (1 2018).
  • Pruitt, A.; Liu, Y.; Jin, N.; Simonetti, O. et al. "Automatic Image-Based Background Phase Correction in the Presence of Wrap-Around Artifact." (1 2018).
  • Varghese, J.; Cardona, A.; Raman, S.; Ahmad, R. et al. "Comparison of Cardiac Magnetic Resonance-Derived Blood Oximetry to Invasive Catheterization in Heart Transplant Recipients." (1 2018).
  • Bush, M.A.; Simonetti, O.; Ahmad, R.; Liu, Y. et al. "Prospective correction of patient-specific respiratory motion in T1 mapping." (1 2018).
  • Bush, M.; Simonetti, O.; Ahmad, R.; Liu, Y. et al. "Patient specific prospective respiratory motion correction for efficient, free-breathing cardiovascular MRI." (1 2018).
  • Liu, Y.; Ahmad, R.; Jin, N.; Tani, D. et al. "Strain Encoding (SENC) Using EPI Readout." (1 2018).
  • Varghese, J.; Liu, Y.; Jin, N.; Armstrong, A. et al. "Comparison of Intra-Cardiac Magnetic Resonance Blood Oximetry to Invasive Catheterization in Pediatric Patients with Congenital Heart Disease." (1 2018).
  • Rich, A.; Liu, Y.; Jin, N.; Potter, L. et al. "Single Breath Hold 4D Flow Acquisition of the Aortic Valve." (1 2018).
  • Simonetti, O.; Ahmad, R. "The Potential for Cardiovascular MRI at Low Field." (1 2018).

2017

  • Bush, M.; Ahmad, R.; Simonetti, O.P. "Respiratory motion compensation for efficient, free-breathing cardiovascular MRI." (1 2017).
  • Dong, H.; Joseph, M.; Kalra, P.; Mo, X. et al. "In Vivo Magnetic Resonance Elastography of Abdominal Aortic Aneurysm in a Porcine Model." (1 2017).
  • Varghese, J.; Ahmad, R.; Raman, S.; Potter, L.C. et al. "Intracardiac MR Oximetry in Patients with Cardiovascular Disease: Preliminary Comparison with Right Heart Catheterization." (1 2017).
  • Rich, A.V.; Potter, L.C.; Jin, N.; Liu, Y. et al. "A Bayesian Approach to Enable Single Breath-hold 4D Flow MRI." (1 2017).
  • Liu, Y.; Ting, S.; Jin, N.; Simonetti, O.P. et al. "Fully Automated Online Compressive Recovery for Real-Time, Free-Breathing CINE." (1 2017).
  • Pruitt, A.; Jin, N.; Simonetti, O.; Liu, Y. et al. "An Outlier Rejection Scheme to Improve Background Phase Correction in PC-MRI." (1 2017).
  • Ebersole, C.; Ahmad, R.; Rich, A.; Potter, L. et al. "Highly Accelerated Magnetic Resonance Elastography Via Bayesian Modeling." (1 2017).

2016

  • da Silveira, J.; Smyke, M.E.; Ahmad, R.; Jin, N. et al. "Peak velocity estimation in aortic stenosis patients using a fast three-directional two-dimensional phase contrast technique in a single breath-hold: comparison to unidirectional phase contrast MRI and transthoracic echocardiography." (1 2016).
  • Ting, S.T.; Ahmad, R.; Jin, N.; Simonetti, O.P. "Patch-based, iteratively-reweighted compressive recovery for reconstruction of highly accelerated exercise stress cardiac cine." (1 2016).
  • da Silveira, J.; Rich, A.V.; Liu, Y.; Smyke, M. et al. "Highly accelerated phase-contrast MRI-based multi-directional flow imaging for peak velocity estimation in aortic stenosis patients.." (1 2016).
  • Varghese, J.; Ahmad, R.; Jin, N.; Potter, L.C. et al. "Venous oxygen saturation estimation from multiple T2 maps with varying inter-echo spacing." (1 2016).
  • Ahmad, R.; Schroede, S.A.; White, R.D.; Kolipaka, A. "Accelerated MR Elastography for Quantitative Measurement of Myocardial Stiffness." (1 2016).
  • Varghese, J, Ahmad, R, Jin, N, Potter, LC, Simonetti, OP "Venous Oxygen Saturation Estimation from Multiple T2 Maps with Varying Inter-Echo Spacing." in Annual SCMR Workshop: Quantitative CMR: From Technique Development to Practical Implementation. (1 2016).
  • Ahmad, R.; Jin, N.; Simonetti, O.P. "Background Phase Correction for Quantitative Phase-Contrast MRI." (1 2016).
  • Serafim da Silveira, J, Smyke, ME, Ahmad, R, Jin, N, Scandling, D, Dickerson, JA, Rochitte, CE, Raman, SV, Simonetti, OP "Peak velocity estimation in aortic stenosis patients using a fast three-directional two-dimensional phase contrast technique in a single breath-hold: comparison to unidirectional phase contrast MRI and transthoracic echocardiography." in SCMR 19th Annual Scientific Sessions. (1 2016).
  • Ahmad R, Schroeder SA, White RD, Kolipaka A. "Accelerated MR Elastography for Quantitative Measurement of Myocardial Stiffness.." in ISMRM. (5 2016).
  • Adam, R.; Potter, L.C.; Jin, N.; Silveira, J.S.D. et al. "Joint processing of highly accelerated multi-directional phase-contrast MRI using ReVEAL." (1 2016).
  • Serafim da Silveira, J, Rich, A, Liu, Y, Smyke, M, Jin, N, Scandling, D, Dickerson, JA, Rochitte, CE, Raman, S, Potter, LC, Ahmad, R, Simonetti, OP "Highly Accelerated Phase-Contrast Mri-Based Multi-Directional Flow Imaging for Peak Velocity Estimation in Aortic Stenosis Patients." in Annual SCMR Workshop: Quantitative CMR: From Technique Development to Practical Implementation. (1 2016).

2015

  • Rich, A.; Potter, L.C.; Ash, J.N.; Ahmad, R. "FACTOR GRAPHS FOR INVERSE PROBLEMS: ACCELERATED PHASE CONTRAST MAGNETIC RESONANCE IMAGING." in IEEE International Conference on Image Processing (ICIP). (1 2015).
  • Wolfson, H.; Ahmad, R.; Twig, Y.; Blank, A. et al. "A hand-held EPR scanner for transcutaneous oximetry." (1 2015).
  • Ting, S.T.; Ahmad, R.; Jin, N.; Serafim da Silveira, J. et al. "Low Latency Reconstruction of Free-breathing Real-time Cardiac Cine with VISTA and SENSE." (1 2015).
  • Ahmad, R.; Schniter, P.; Simonetti, O.P. "Parameter-Free Sparsity Adaptive Compressive Recovery (SCoRe)." (1 2015).
  • Rich, A.; Potter, L.C.; Jin, N.; Ash, J. et al. "A Bayesian Approach for Accelerated Phase Contrast MRI." (1 2015).
  • Rich, A.; Potter, L.C.; Ashi, J.N.; Ahmad, R. "Factor graphs for inverse problems: Accelerated phase contrast magnetic resonance imaging." (9 2015).
  • Rich, A, Potter, LC, Ash, J, Ahmad, R "Factor Graphs for Inverse Problems: Accelerated Phase Contrast Magnetic Resonance Imaging." in 2015 IEEE International Conference on Image Processing (ICIP). (1 2015).
  • Ting, ST, Ahmad, R, Jin, N, Serafim da Silveira, J, Simonetti, OP "Low Latency Reconstruction of Free-breathing Real-time Cardiac Cine with VISTA and SENSE." in ISMRM 23rd Annual Meeting & Exhibition. (1 2015).
  • Rich, A, Potter, LC, Jin, N, Ash, J, Simonetti, OP, Ahmad, R "A Bayesian Approach for Accelerated Phase Contrast MRI." in ISMRM 23rd Annual Meeting & Exhibition. (1 2015).
  • Ahmad, R, Schniter, P, Simonetti, OP "Parameter-Free Sparsity Adaptive Compressive Recovery (SCoRe)." in ISMRM 23rd Annual Meeting & Exhibition. (1 2015).
  • Rich, A.; Potter, L.C.; Ash, J.N.; Ahmad, R. et al. "FACTOR GRAPHS FOR INVERSE PROBLEMS: ACCELERATED PHASE CONTRAST MAGNETIC RESONANCE IMAGING." (1 2015).
  • Rich, A.; Potter, L.C.; Ashi, J.N.; Ahmad, R. "Factor graphs for inverse problems: Accelerated phase contrast magnetic resonance imaging." (12 2015).

2014

  • Ting, S.T.; Ding, Y.; Giri, S.; Jin, N. et al. "Sub-30 ms real-time, free-breathing cardiac imaging with SPIRiT." (1 2014).
  • Ahmad, R.; Ting, S.T.; Craft, J.; Giri, S. et al. "High-resolution, real-time exercise stress cine." (1 2014).
  • Ting, S.; Ding, Y.; Xue, H.; Giri, S. et al. "Sub-30ms Real-Time, Free-Breathing Cardiac Cine with VISTA Sampling and SPIRiT Reconstruction: A Comparison with Conventional Segmented Cine." (1 2014).
  • Ding, Y.; Ahmad, R.; Jin, N.; Simonetti, O. "A New Perspective on the 4-point Balanced Velocity-encoding." (1 2014).
  • Rich, A.; Potter, L.; Jin, N.; Ash, J. et al. "A Factor Graph Approach for Accelerated Phase Contrast MRI." (1 2014).
  • Ting, Samuel, Ding, Yu, Xue, Hui, Giri, Shivraman, Jin, Ning, Ahmad, Rizwan, Simonetti, Orlando P "Sub-30ms Real-Time, Free-Breathing Cardiac Cine with VISTA Sampling and SPIRiT Reconstruction: A Comparison with Conventional Segmented Cine." in ISMRM 22nd Annual Meeting & Exhibition. (1 2014).
  • Ding, Y, Ahmad, R, Jin, N, Simonetti, OP "A New Perspective on the 4-point Balanced Velocity-encoding." in ISMRM 22nd Annual Meeting & Exhibition. (1 2014).
  • Ting, ST, Ding, Y, Giri, S, Jin, N, Simonetti, OP, Ahmad, R Sub-30 ms real-time, free-breathing cardiac imaging with SPIRiT. http://www.jcmr-online.com/content/16/S1/W2, (1 2014).
  • Ahmad, R, Ting, ST, Craft, J, Giri, S, Jin, N, Raman, SV, Simonetti, OP High-resolution, real-time exercise stress cine. http://www.jcmr-online.com/content/16/S1/W14, (1 2014).
  • Ahmad, R.; Jin, N.; Ding, Y.; Simonetti, O. "An Adaptive Phase Recovery Method for 4D Phase-Contrast MRI." (1 2014).
  • Ahmad, R, Jin, N, Ding, Y, Simonetti, OP "An Adaptive Phase Recovery Method for 4D Phase-Contrast MRI." in ISMRM 22nd Annual Meeting & Exhibition. (1 2014).

2013

  • Johnson, D.H.; Ahmad, R.; Samouilov, A.; Zweier, J.L. "Spatial 3D EPR Imaging with Compressed Sensing Reconstruction." (1 2013).
  • Johnson, DH, Chen, Z, Ahmad, R, Samouilov, A, Zweier, JL "Uniform Spinning Sampling Gradient Electron Paramagnetic Resonance Imaging." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Ting, ST, Ding, Y, Ahmad, R, Xue, H, Simonetti, OP "Taming an Ill-Conditioned SPIRiT: Improved Iterative Image Reconstruction for Real-Time Cardiac MRI." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Jin, N, Ahmad, R, Ding, Y, Zuehlsdorff, S, Simonetti, OP "High temporal-resolution three-directional velocity measurements in a single breath-hold using EPI and direct inversion." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Johnson, D.H.; Chen, Z.; Ahmad, R.; Samouilov, A. et al. "Uniform Spinning Sampling Gradient Electron Paramagnetic Resonance Imaging." (1 2013).
  • Golub, F, Potter, LC, Ash, JN, Ahmad, R T2 Estimation for Spin-Echo EPR. in 41st Annual ISOTT/EPR 2013 Conference. http://isott.org/index.php/news-reader/items/isott-2013-hanover-nh-usa.html, (1 2013).
  • Ding, Y, Ahmad, R, Xue, H, Potter, LC, Ting, S, Jin, N, Simonetti, OP "A Bilinear Noise Transfer Model for SENSE Reconstruction." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Palmer, J.; Potter, L.C.; Kuppusamy, P.; Ahmad, R. "Application-specific evaluation of oxygen measurement accuracy of EPR probes." (1 2013).
  • Ding, Y, Xue, H, Ahmad, R, Ting, ST, Jin, N, Potter, LC, Simonetti, Orlando P "A Bilinear Noise Transfer Model for GRAPPA Reconstruction." in ISMRM Workshop on Data Sampling and Image Reconstruction. (1 2013).
  • Ding, Y.; Ahmad, R.; Xue, H.; Ting, S.T. et al. "L1-Regularized GRAPPA Kernel Estimate." (1 2013).
  • Golub, F.; Potter, L.C.; Ahmad, R. "Characterization of EPR spin-echo data for accelerated oximetry." (1 2013).
  • Johnson, D.H.; Ahmad, R.; Samouilov, A.; Zweier, J.L. "Uniform Spinning Sampling Gradient Electron Paramagnetic Resonance Imaging." (1 2013).
  • Ting, S.T.; Ahmad, R.; Ding, Y.; Xue, H. et al. "S-SPIRiT: An Iterative/Shrinkage Approach to SPIRiT for Real-Time Cardiac MRI." (1 2013).
  • Ding, Y.; Ahmad, R.; Xue, H.; Potter, L.C. et al. "A Bilinear Noise Transfer Model for SENSE Reconstruction." (1 2013).
  • Ahmad, R.; Xue, H.; Ding, Y.; Simonetti, O.P. "Variable Density Incoherent Spatial-Temporal Acquisition (VISTA) for Cardiac MRI." (1 2013).
  • Jin, N.; Ahmad, R.; Ding, Y.; Zuehlsdorff, S. et al. "High temporal-resolution three-directional velocity measurements in a single breath-hold using EPI and direct inversion." (1 2013).
  • Ting, Samuel T, Ahmad, Rizwan, Ding ,Yu, Xue, Hui, Potter, Lee C, Simonetti, Orlando P "S-SPIRiT: An Iterative/Shrinkage Approach to SPIRiT for Real-Time Cardiac MRI." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Ding, Y.; Ahmad, R.; Xue, H.; Ting, S.T. et al. "Comparing Boundary Sharpness of SENSE and GRAPPA." (1 2013).
  • Ding, Y, Ahmad, R, Xue, H, Ting, ST, Jin, N, Simonetti, OP "L1-Regularized GRAPPA Kernel Estimate." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Johnson, DH, Ahmad, R, Samouilov, A, Zweier, JL "Spatial 3D EPR Imaging with Compressed Sensing Reconstruction." in 41st Annual ISOTT/EPR 2013 Conference. (1 2013).
  • Ahmad, R, Xue, H, Ding, Y, Simonetti, OP Variable Density Incoherent Spatial-Temporal Acquisition (VISTA) for Cardiac MRI. in ISMRM Workshop on Data Sampling and Image Reconstruction. http://www.ismrm.org/workshops/Data13/program.htm, (1 2013).
  • Johnson, DH, Ahmad, R, Samouilov, A, Zweier, JL "Uniform Spinning Sampling Gradient Electron Paramagnetic Resonance Imaging." in 41st Annual ISOTT/EPR 2013 Conference. (1 2013).
  • Golub, F, Potter, LC, Ahmad, R "Characterization of EPR spin-echo data for accelerated oximetry." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Golub, F.; Potter, L.C.; Ash, J.N.; Ahmad, R. "T2 Estimation for Spin-Echo EPR." (1 2013).
  • Ahmad, R.; Jin, N.; Ding, Y.; Simonetti, O.P. "Direct Reconstruction (DiR) for PC-MRI." (1 2013).
  • Ding, Y, Ahmad, R, Xue, H, Ting, ST, Jin, N, Simonetti, OP "Comparing Boundary Sharpness of SENSE and GRAPPA." in ISMRM Workshop on Data Sampling and Image Reconstruction. (1 2013).
  • Ting, S.T.; Ding, Y.; Ahmad, R.; Xue, H. et al. "Taming an Ill-Conditioned SPIRiT: Improved Iterative Image Reconstruction for Real-Time Cardiac MRI." (1 2013).
  • Ahmad, R.; Jin, N.; Ding, Y.; Simonetti, O.P. "A direct reconstruction method for blood velocity estimation from phase-contrast MRI data." (1 2013).
  • Ahmad, R, Jin, N, Ding, Y, Simonetti, OP "A direct reconstruction method for blood velocity estimation from phase-contrast MRI data." in ISMRM 21st Annual Meeting & Exhibition. (1 2013).
  • Palmer, J, Potter, LC, Kuppusamy, P, Ahmad, R "Application-specific evaluation of oxygen measurement accuracy of EPR probes." in 41st Annual ISOTT/EPR 2013 Conference. (1 2013).
  • Ding, Y.; Xue, H.; Ahmad, R.; Ting, S.T. et al. "A Bilinear Noise Transfer Model for GRAPPA Reconstruction." (1 2013).

2012

  • Johnson, D.; Chen, Z.; Ahmad, R.; Samouilov, A. et al. "Temporal Tomographic Imaging By Greedy Feteke and Golden Means Sampling." (1 2012).
  • Palaniappan, P.; Simonetti, O.P.; Ding, Y.; Ahmad, R. et al. "KLT and Wavelet Filtering: Reducing Noise in Highly Accelerated Dynamic Images." (1 2012).
  • Ahmad, R.; Xue, H.; Ding, Y.; Simonetti, O.P. "Variable Density Incoherent Spatial-Temporal Acquisition for Cardiac MR." (1 2012).
  • Johnson, D, Chen, Z, Ahmad, R, Samouilov, A, Zweier, JL "Temporal Tomographic Imaging By Greedy Feteke and Golden Means Sampling." in ISMRM 20th Annual Meeting & Exhibition. (1 2012).
  • Palaniappan, P, Simonetti, OP, Ding, Y, Ahmad, R, Xue, H, Chang, TC, Guetter, C "KLT and Wavelet Filtering: Reducing Noise in Highly Accelerated Dynamic Images." in ISMRM 20th Annual Meeting & Exhibition. (1 2012).

2011

  • Ahmad, R.; Austin, C.D.; Potter, L.C. "Toeplitz embedding for fast iterative regularized imaging." (5 2011).
  • Ahmad, R "Multisite EPR Oximetry using Multiple Field Modulation Harmonics." in 53rd Rocky Mountain Conference on Analytical Chemistry, 34th International EPR Symposium. (1 2011).
  • Ahmad, R. "Multisite EPR Oximetry using Multiple Field Modulation Harmonics." (1 2011).
  • Ahmad, R. "Accelerated pH Imaging using electron paramagnetic resonance." (1 2011).
  • Ahmad, R, Austin, C, Potter, LC "Toeplitz embedding for fast iterative regularized imaging." in Proceedings SPIE: Algorithms for Synthetic Aperture Radar Imagery XVIII. (1 2011).

2010

  • Som, S.; Ahmad, R.; Potter, L.C.; Kesselring, E. et al. "A digital receiver for EPR spectroscopy." (1 2010).
  • Ahmad, R.; Kuppusamy, P.; Potter, L.C. "Nested uniform sampling for multiresolution 3-D tomography." (1 2010).
  • Ahmad, R.; Caia, G.; Potter, L.C.; Petryakov, S. et al. "In vivo oximetry using EPR-NRM coimaging." (1 2010).
  • Ahmad, R.; Kuppusamy, P.; Potter, L.C. "NESTED UNIFORM SAMPLING FOR MULTIRESOLUTION 3-D TOMOGRAPHY." in 2010 IEEE International Conference on Acoustics, Speech, and Signal Processing. (1 2010).
  • Ahmad, R, Kuppusamy, P, Potter, LC "Nested Uniform Sampling for Multiresolution 3-D Tomography." in 2010 IEEE International Conference on Acoustics, Speech and Signal Processing. (1 2010).
  • Ahmad, R, Caia, G, Potter, LC, Petryakov, S, Kuppusamy, P, Zweier JL "In vivo oximetry using EPR-NRM coimaging." in A Joint Conference of the 14th In Vivo ESR/EPR Spectroscopy & Imaging and the 11th International EPR Spin Trapping/Spin Labeling. (1 2010).
  • Ahmad, R.; Kuppusamy, P.; Potter, L.C. "Nested uniform sampling for multiresolution 3-D tomography." (11 2010).
  • Som, S, Ahmad, R, Potter, LC, Kesselring, E, Kuppusamy, P, Zweier JL "A digital receiver for EPR spectroscopy." in A Joint Conference of 14th In Vivo ESR/EPR Spectroscopy & Imaging and the 11th International EPR Spin Trapping/Spin Labeling. (1 2010).
  • Ahmad, R.; Kuppusamy, P.; Potter, L.C.; IEEE, "NESTED UNIFORM SAMPLING FOR MULTIRESOLUTION 3-D TOMOGRAPHY." (1 2010).

2009

  • Ahmad, R.; Potter, L.; Kuppusamy, P. "Oscillating Radial Trajectories for Reduced Undersampling Artifacts." (1 2009).
  • Ahmad, R, Potter, LC, Kuppusamy, P "Oscillating Radial Trajectories for Reduced Undersampling Artifacts." in ISMRM 17th Annual Meeting & Exhibition. (1 2009).

2007

  • Som, S, Potter, LC, Ahmad, R, Kuppusamy, P "Reduced Acquisition Spectral-Spatial EPR Oximetry." in A Joint Conference of 12th In Vivo EPR Spectroscopy and Imaging 9th International EPR Spin Trapping/Spin Labeling. (1 2007).
  • Ahmad, R.; Potter, L.C.; Clymer, B.; Zweier, J.L. et al. "Progressive uniform distribution of EPR data." (1 2007).
  • Som, S.; Potter, L.C.; Ahmad, R.; Kuppusamy, P. "Reduced Acquisition Spectral-Spatial EPR Oximetry." (1 2007).
  • Ahmad, R.; Vikram, D.S.; Clymer, B.; Potter, L.C. et al. "Uniform Sampling for 4D Spectral-Spatial EPR Imaging." (1 2007).
  • Ahmad, R, Potter, LC, Clymer, B, Zweier, JL, Kuppusamy, P "Progressive uniform distribution of EPR data." in 49th Rocky Mountain Conference for Analytical Chemistry. (1 2007).
  • Ahmad, R, Vikram, DS, Clymer, B, Potter, LC, Srinivasan, P, Zweier, Jay L, Kuppusamy, P "Uniform Sampling for 4D Spectral-Spatial EPR Imaging." in A Joint Conference of 12th In Vivo EPR Spectroscopy and Imaging 9th International EPR Spin Trapping/Spin Labeling. (1 2007).

2006

  • Ahmad, R.; Clymer, B.; Deng, Y.; Petryakov, S. et al. "An Automated On-The-Fly Detection and Correction Procedure for EPR Imaging Data Acquisition." (1 2006).
  • Ahmad, R, Clymer, B, Deng, Y, Petryakov, S, Vikram, DS, Kuppusamy, P, Zweier, JL "An Automated On-The-Fly Detection and Correction Procedure for EPR Imaging Data Acquisition." in ISMRM 14th Annual Meeting & Exhibition. (1 2006).

2005

  • Ahmad, R, Zweier, JL, Kuppusamy, P, Clymer, B "Adaptive Image Reconstruction for EPR." in ISMRM 13th Annual Meeting & Exhibition. (1 2005).
  • Ahmad, R.; Clymer, B.; Deng, Y.; He, G. et al. "Adaptive sampling for in vivo EPRI." (1 2005).
  • Ahmad, R.; Zweier, J.L.; Kuppusamy, P.; Clymer, B. "Adaptive Image Reconstruction for EPR." (1 2005).
  • Ahmad, R, Clymer, B, Deng, Y, He, G, Vikram, DS, Kuppusamy, P, Zweier, JL "Adaptive sampling for in vivo EPRI." in International Conference on Electron Paramagnetic Resonance Spectroscopy and Imaging of Biological Systems. (1 2005).

Unknown

  • Ahmad, R, Schroede, SA, White, RD, Kolipaka, A "Accelerated MR Elastography for Quantitative Measurement of Myocardial Stiffness." in ISMRM 24th Annual Meeting & Exhibition.
  • Rich, A, Potter, LC, Jin, N, Serafim da Silveira, J, Simonetti, OP, Ahmad, R "Joint processing of highly accelerated multi-directional phase-contrast MRI using ReVEAL." in ISMRM 24th Annual Meeting & Exhibition.
  • Ahmad, R, Jin, N, Simonetti, OP "Background Phase Correction for Quantitative Phase-Contrast MRI." in ISMRM 24th Annual Meeting & Exhibition.

Patents

  • Kolipaka A, Ahmad R. "METHODS FOR CO-IMAGING TISSUE STIFFNESS AND BLOOD FLOW IN AN MRI SCAN."
  • Ahmad, R, Simonetti, OP, Potter, LC, Rich, A, Ting, ST. "Low-Field MRI Scanner for Cardiac Imaging."
  • Ahmad, R, Ding, Y, Simonetti, OP. "Variable Density Incoherent Constrained Sampling (VICS) for Highly Accelerated Magnetic Resonance Imaging."
  • Ahmad, R, Jin, N, Simonetti, OP. "Background Phase Correction for Quantitative Cardiovascular MRI."
  • Ding, Y, Ahmad, R, Simonetti, OP, Ting, S, Xue, H,. "Self-Constraint Non-Iterative GRAPPA Reconstruction with Closed-Form Solution."
  • Ahmad, R, Ding, Y, Ning, J, Simonetti, OP. "Direct Inversion for Phase-Based Dynamic Magnetic Resonance Measurement."
  • Simonetti, OP, Ahmad, R, Potter, LC, Varghese, J. "A Magnetic Resonance Imaging Method to Non-Invasively Measure Blood Oxygen Saturation."
  • Ahmad, R, Simonetti, OP, Potter, LC, Rich, A, Ting, ST. "Low-Field MRI Scanner for Cardiac Imaging." Patent number: 9,874,620
  • Ahmad,R, Ash, J, Jin, N, Potter, LC, Rich, AV, Simonetti, OP. "A Bayesian Model for Highly Accelerated Phase-Contrast MRI."
  • "A Bayesian model for highly accelerated phase-contrast MRI."
  • "Magnetic Resonance Imaging Method to Non-Invasively Measure Blood Oxygen Saturation."
  • Simonetti, OP, Ahmad, R, Potter, LC, Varghese, J. "Magnetic Resonance Imaging Method to Non-Invasively Measure Blood Oxygen Saturation."
  • Kolipaka A, Ahmad R. "Methods for Co-Imaging Tissue Stiffness and Blood Flow in an MRI."
  • "Methods for Co-Imaging Tissue Stiffness and Blood Flow in an MRI Scan."
  • Ahmad, R, Jin, N, Simonetti, OP. "Background Phase Correction for Quantitative Cardiovascular MRI." Patent number: 9,911,062
  • "Low-Field MRI Scanner for Cardiac Imaging."
  • "A Bayesian Model for Highly Accelerated Phase-Contrast MRI."
  • Ahmad, R, Ding, Y, Simonetti, OP. "Variable Density Incoherent Constrained Sampling (VICS) for Highly Accelerated Magnetic Resonance Imaging." Patent number: 9,939,509
  • "Variable Density Incoherent Costrained Sampling (VICS) for Highly Accelerated Magnetic Resonance Imaging."
  • "Variable Density Incoherent Spatial-Temporal Acquisition (VISTA) for Cardiac MR."
  • "Self-Constraint Non-Iterative GRAPPA Construction with Closed-Form Solution."
  • "Direct Inversion for Phase-Based Dynamic Magnetic Resonance Measurements."
  • "Electron Paramagnetic Resonance Systems and Methods for Transcutaneous and Subcutaneous Oxygen."
  • "METHOD AND SYSTEM FOR ELECTRON PARAMAGNETIC RESONANCE."
  • "Background Phase Correction for Quantitative Cardiovascular MRI."