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Rizwan Ahmad

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

About

Education

PhD: Ohio State University, Department of Electrical and Computer Engineering, 2007

MS: Electrical and Computer Engineering, The Ohio State University, March 2004

BS: (with honors) in Electrical Engineering, University of Engineering & Tech., Lahore, Pakistan, December 2000

Areas of Interest

Ahmad's research aims to bring engineering innovations to biomedical imaging. He is particularly interested in developing data acquisition and image reconstruction methods that improve diagnostic accuracy of established or emerging imaging modalities. His research expertise encompasses digital signal and image processing, tomographic reconstruction, linear and nonlinear inverse problems, statistical sensitivity analysis, multimodal imaging, and biomedical instrumentation, with application to magnetic resonance imaging (MRI) and electron paramagnetic resonance (EPR) spectroscopy and imaging.

Office

126A Tzagournis Medical Research Facility, 420 W 12th Avenue, Columbus OH, 43210

 

Honors

  • 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

    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

2019

  • Chen, C.; Liu, Y.; Schniter, P.; Jin, N. et al., 2019, "Sparsity adaptive reconstruction for highly accelerated cardiac MRI." Magnetic Resonance in Medicine

2018

  • 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.
  • 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
  • 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

2017

  • 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.
  • 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.
  • 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

  • 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.
  • 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.
  • 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

  • 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.
  • 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.
  • 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.; 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.

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.
  • 2013, "Estimation of Spin-Echo Relaxation Time." Journal of Magnetic Resonance 237,
  • 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

  • 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.
  • 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.
  • 2012, Spectral modeling for accelerated pH spectroscopy using EPR. Journal of Magnetic Resonance 218,
  • 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.
  • 2012, Dual-scan acquisition for accelerated continuous-wave EPR oximetry. Journal of Magnetic Resonance 222,
  • 2012, Multisite EPR oximetry from multiple quadrature harmonics. Journal of Magnetic Resonance 214, no. 1,
  • 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.

2011

  • 2011, "Optimization of magnetic field sweep and field modulation amplitude for CW EPR oximetry." Journal of Magnetic Resonance 209, no. 2,
  • 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.
  • 2010, Digital detection and processing of multiple quadrature harmonics for EPR spectroscopy. Journal of Magnetic Resonance 207, no. 2,
  • Ahmad, R.; Kuppusamy, P., 2010, "Theory, instrumentation, and applications of electron paramagnetic resonance oximetry." Chemical Reviews 110, no. 5, 3212-3236 - 3212-3236.
  • 2010, In vivo multisite oximetry using EPR-NMR coimaging. Journal of Magnetic Resonance 207, no. 1,
  • 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.

2008

  • 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.
  • 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.
  • 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,
  • 2008, Estimation of mean and median pO2 values for a composite EPR spectrum. Journal of Magnetic Resonance 192, no. 2,
  • 2008, EPR oximetry in three spatial dimensions using sparse spin distribution. Journal of Magnetic Resonance 193, no. 2,

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.
  • 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.
  • 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.
  • 2007, A parametric approach to spectral-spatial EPR imaging. Journal of Magnetic Resonance 186, no. 1,
  • 2007, Uniform distribution of projection data for improved reconstruction quality of 4D EPR imaging. Journal of Magnetic Resonance 187, no. 2,
  • 2007, Quasi Monte Carlo-based isotropic distribution of gradient directions for improved reconstruction quality of 3D EPR imaging. Journal of Magnetic Resonance 184, no. 2,
  • 2007, Enhanced resolution for EPR imaging by two-step deblurring. Journal of Magnetic Resonance 184, no. 2,

2006

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

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).
  • Rich, A.; Potter, L.C.; Ashi, J.N.; Ahmad, R. "Factor graphs for inverse problems: Accelerated phase contrast magnetic resonance imaging." (12 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.; 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).
  • Rich, A.; Potter, L.C.; Ashi, J.N.; Ahmad, R. "Factor graphs for inverse problems: Accelerated phase contrast magnetic resonance imaging." (9 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, Austin, C, Potter, LC "Toeplitz embedding for fast iterative regularized imaging." in Proceedings SPIE: Algorithms for Synthetic Aperture Radar Imagery XVIII. (1 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).
  • Ahmad, R.; Kuppusamy, P.; Potter, L.C. "Nested uniform sampling for multiresolution 3-D tomography." (11 2010).
  • Ahmad, R.; Kuppusamy, P.; Potter, L.C.; IEEE, "NESTED UNIFORM SAMPLING FOR MULTIRESOLUTION 3-D TOMOGRAPHY." (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, L.C. "Nested uniform sampling for multiresolution 3-D tomography." (1 2010).

Unknown

  • Ahmad, R, Schroede, SA, White, RD, Kolipaka, A "Accelerated MR Elastography for Quantitative Measurement of Myocardial Stiffness." 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."
  • "HEMHOLTZ INVERSION USING UNCONSTRAINED OPTIMIZATION."