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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
  • 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

  • January, 2020

    Second-place poster presentation award by Shen Zhao.

  • October, 2018

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

  • June, 2018

    Summa Cum Laude Merit Award for Shen Zhao.

  • June, 2018

    1st Place for Cardiac MR Study Group Abstract Award for Shen Zhao.

  • April, 2017

    Lumley Research Award.

  • April, 2017

    Power pitch (awarded to top 2.7% abstracts).

  • 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

2020

  • Serai, S.D.; Hu, H.H.; Ahmad, R.; White, S. et al., 2020, "Newly Developed Methods for Reducing Motion Artifacts in Pediatric Abdominal MRI: Tips and Pearls.." AJR Am J Roentgenol 214, no. 5, 1042-1053 - 1042-1053.

2019

  • Kuppusamy, P.; Kmiec, M.M.; Tse, D.; Mast, J.M. et al., 2019, "Estimation of pO2 histogram from a composite EPR Spectrum of multiple random implants.." Biomed Microdevices 22, no. 1, 3 - 3.
  • Chen, C.; Liu, Y.; Schniter, P.; Jin, N. et al., 2019, "Sparsity adaptive reconstruction for highly accelerated cardiac MRI." Magnetic Resonance in Medicine
  • Samouilov, A.; Ahmad, R.; Boslett, J.; Liu, X. et al., 2019, "Development of a fast-scan EPR imaging system for highly accelerated free radical imaging." Magnetic Resonance in Medicine 82, no. 2, 842-853 - 842-853.
  • Kmiec, M.M.; Tse, D.; Mast, J.M.; Ahmad, R. et al., 2019, "Implantable microchip containing oxygen-sensing paramagnetic crystals for long-term, repeated, and multisite in vivo oximetry.." Biomed Microdevices 21, no. 3, 71 - 71.
  • Rich, A.; Gregg, M.; Jin, N.; Liu, Y. et al., 2019, "CArtesian sampling with Variable density and Adjustable temporal resolution (CAVA)." Magnetic Resonance in Medicine

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
  • Rich, A.; Potter, L.C.; Jin, N.; Liu, Y. et al., 2018, "A Bayesian approach for 4D flow imaging of aortic valve in a single breath-hold." Magnetic Resonance in Medicine
  • Pruitt, A.A.; Jin, N.; Liu, Y.; Simonetti, O.P. et al., 2018, "A method to correct background phase offset for phase-contrast MRI in the presence of steady flow and spatial wrap-around artifact." Magnetic Resonance in Medicine
  • Zgadzai, O.; Twig, Y.; Wolfson, H.; Ahmad, R. et al., 2018, "Electron-Spin-Resonance Dipstick.." Anal Chem 90, no. 13, 7830-7836 - 7830-7836.
  • 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

  • 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,
  • Ting, S.T.; Ahmad, R.; Jin, N.; Craft, J. et al., 2017, "Fast implementation for compressive recovery of highly accelerated cardiac cine MRI using the balanced sparse model." Magnetic Resonance in Medicine 77, no. 4, 1505-1515 - 1505-1515.
  • 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.

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.
  • Rich, A.V.; Potter, L.C.; Jin, N.; Ash, J. et al., 2016, "A Bayesian model for highly accelerated phase-contrast MRI.." Magnetic resonance in medicine 76, no. 2, 689-701 - 689-701.

2015

  • Wolfson, H.; Ahmad, R.; Twig, Y.; Wiliams, B. et al., 2015, "A magnetic resonance probehead for evaluating the level of ionizing radiation absorbed in human teeth.." Health Physics 108, no. 3, 326-335 - 326-335.
  • Ahmad, R.; Schniter, P., 2015, "Iteratively Reweighted L1 Approaches to Sparse Composite Regularization." IEEE Transactions on Computational Imaging 1, no. 4, 220-235 - 220-235.
  • Ahmad, R.; Xue, H.; Giri, S.; Ding, Y. et al., 2015, "Variable density incoherent spatiotemporal acquisition (VISTA) for highly accelerated cardiac MRI.." Magnetic resonance in medicine 74, no. 5, 1266-78 - 1266-78.
  • Ding, Y.; Xue, H.; Ahmad, R.; Chang, T. et al., 2015, "Paradoxical effect of the signal-to-noise ratio of GRAPPA calibration lines: A quantitative study." Magnetic Resonance in Medicine 74, no. 1, 231-239 - 231-239.
  • 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.
  • Serafim, J.; Smyke, M.; Jin, N.; Ahmad, R. et al., 2015, "Aortic Stenosis assessment with a 3-directional phase contrast magnetic resonance technique . Comparison to transthoracic echocardiography." Journal of Cardiovascular Magnetic Resonance 17, no. Suppl 1, P381-P381 - P381-P381.

2014

  • Gungor, D.; Ahmad, R.; Potter, L.C., 2014, "A subspace approach to blind coil sensitivity estimation in parallel MRI." Journal of Cardiovascular Magnetic Resonance 16, no. Suppl 1, W1-W1 - W1-W1.
  • Johnson, D.H.; Ahmad, R.; He, G.; Samouilov, A. et al., 2014, "Compressed sensing of spatial electron paramagnetic resonance imaging.." Magnetic Resonance in Medicine 72, no. 3, 893-901 - 893-901.
  • Johnson, D.H.; Ahmad, R.; Liu, Y.; Chen, Z. et al., 2014, "Uniform spinning sampling gradient electron paramagnetic resonance imaging." Magnetic Resonance in Medicine 71, no. 2, 893-900 - 893-900.
  • Wolfson, H.; Ahmad, R.; Twig, Y.; Kuppusamy, P. et al., 2014, "A Miniature Electron Spin Resonance Probehead for Transcutaneous Oxygen Monitoring." Applied Magnetic Resonance 45, no. 10, 955-967 - 955-967.

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.
  • Bender, J.A.; Ahmad, R.; Simonetti, O.P., 2013, "The importance of k -space trajectory on off-resonance artifact in segmented echo-planar imaging." Concepts in Magnetic Resonance Part A 42A, no. 2, 23-31 - 23-31.

2012

  • 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.
  • Ding, Y.; Xue, H.; Ahmad, R.; Ting, S.T. et al., 2012, "SC-GRAPPA: Self-constraint noniterative GRAPPA reconstruction with closed-form solution." Medical Physics 39, no. 12, 7686-7693 - 7686-7693.
  • 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.
  • 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.

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.; 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.
  • 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.; Kuppusamy, P., 2010, "Theory, instrumentation, and applications of electron paramagnetic resonance oximetry." Chemical Reviews 110, no. 5, 3212-3236 - 3212-3236.

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,
  • 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.
  • 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.
  • Vikram, D.S.; Ahmad, R.; Pandian, R.P.; Petryakov, S. et al., 2008, "Evaluation of oxygen-response times of phthalocyanine-based crystalline paramagnetic spin probes for EPR oximetry." Journal of Magnetic Resonance 193, no. 1, 127-132 - 127-132.
  • 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, 39-43 - 39-43.

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.
  • Vikram, D.S.; Bratasz, A.; Ahmad, R.; Kuppusamy, P., 2007, "A comparative evaluation of EPR and OxyLite oximetry using a random sampling of pO(2) in a murine tumor." Radiation Research 168, no. 3, 308-315 - 308-315.

2006

  • 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.; 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.
  • 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.

Unknown

  • Bush, M.; Ahmad, R.; Jin, N.; Liu, Y. et al., "Patient specific prospective respiratory motion correction for efficient, free‐breathing cardiovascular MRI." Magnetic Resonance in Medicine 81, no. 6,

Presentations

Papers in Proceedings

2020

  • Zhao, S.; Potter, L.; lee, K.; Ahmad, R. "Convolutional Framework for Accelerated Magnetic Resonance Imaging." in IEEE ISBI 2020 International Symposium on Biomedical Imaging. (4 2020).
  • Liu, S.; Reehorst, E.; Schniter, P.; Ahmad, R. "Free-breathing Cardiovascular MRI Using a Plug-and-Play Method with Learned Denoiser." in IEEE ISBI 2020 International Symposium on Biomedical Imaging. (4 2020).
  • Chen, C.; Liu, Y.; Simonetti, O.; Ahmad, R. "Automatic Extraction and Sign Determination of Respiratory Signal in Real-time Cardiac Magnetic Resonance imaging." in IEEE ISBI 2020 International Symposium on Biomedical Imaging. (4 2020).

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).
  • Wolfson, H.; Ahmad, R.; Twig, Y.; Blank, A. et al. "A hand-held EPR scanner for transcutaneous oximetry." in SPIE Medical Imaging. (1 2015).

2011

  • Ahmad R,R; Austin,C,D; Potter,L,C "Toeplitz embedding for fast iterative regularized imaging." in Conference on Algorithms for Synthetic Aperture Radar Imagery XVIII. (4 2011).
  • Ahmad, R.; Austin, C.D.; Potter, L.C. "Toeplitz embedding for fast iterative regularized imaging." (5 2011).

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).

Patents

  • Ahmad, R, Simonetti, OP, Potter, LC, Rich, A, Ting, ST. "Low-Field MRI Scanner for Cardiac Imaging." Patent number: 9,874,620
  • "A Bayesian model for highly accelerated phase-contrast MRI."
  • 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
  • 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."
  • Ding, Y, Ahmad, R, Simonetti, OP, Ting, S, Xue, H,. "Self-Constraint Non-Iterative GRAPPA Reconstruction with Closed-Form Solution."
  • "Self-Constraint Non-Iterative GRAPPA Construction with Closed-Form Solution."
  • Ahmad, R, Ding, Y, Ning, J, Simonetti, OP. "Direct Inversion for Phase-Based Dynamic Magnetic Resonance Measurement."
  • "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."
  • "HEMHOLTZ INVERSION USING UNCONSTRAINED OPTIMIZATION."