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Rizwan Ahmad

  • Assistant Professor, Biomedical Engineering
  • Assistant Professor, Electrical & Computer Engr.
  • 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

  • 2015

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

  • 2012

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

  • 2011

    Lumley Interdisciplinary Research Award. .

  • 2009

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

  • 2000

    Top-ten student in the department. .

Chapters

2011

  • Ahmad, R, Kuppusmay, P. 2011. "EPR Imaging: Theory and Instrumentation." In Multifrequency Electron Paramagnetic Resonance: Theory and Applications, edited by Misra, Sushil K, 755 - Weinheim, Germany: Wiley-VCH.

2010

  • Ahmad, R, Khan, M, Vikram, DS, Bratasz, A, Kuppusamy, P. 2010. "EPR Oximetry: Method and Application." In Methods in Redox signaling, edited by Das, Dipak K, 100 - New Rochelle, New York, USA: Mary Ann Liebert.

Journal Articles

2015

  • Serafim da Silveira, J, Smyke, M, Jin, N, Ahmad, R, Jafari, L, Scandling, D, Dickerson, JA, Raman, SV, Simonetti, OP, 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 -
  • Wolfson, H, Ahmad, R, Twig, Y, Wiliams, B, Blank, A, 2015, "A magnetic resonance probehead for evaluating the level of ionizing radiation absorbed in human teeth." Health Physics 108, no. 3, 326 -
  • Ding, Y, Xue, H, Ahmad, R, Chang, TC, Ting, ST, Simonetti, OP, 2015, Paradoxical effect of the signal-to-noise ratio of GRAPPA calibration lines: A quantitative study. Magnetic Resonance in Medicine 74, no. 1, 231 -
  • Ahmad, R, Schniter, P, 2015, Iteratively Reweighted L1 Approaches to Sparse Composite Regularization. IEEE Transactions on Computational Imaging 1, no. 4, 220 -
  • Wolfson,H; Ahmad,R; Twig,Y; Williams,B; Blank,A, 2015, "A magnetic resonance probehead for evaluating the level of ionizing radiation absorbed in human teeth.." Health physics 108, no. 3, 326 - 335.
  • Ahmad, R, Xue, H, Giri, S, Ding, Y, Craft, J, Simonetti, OP, 2015, "Variable density incoherent spatiotemporal acquisition (VISTA) for highly accelerated cardiac MRI." Magnetic resonance in medicine 74, no. 5, 1266 -
  • Ahmad,Rizwan; Xue,Hui; Giri,Shivraman; Ding,Yu; Craft,Jason; Simonetti,Orlando,P, 2015, "Variable density incoherent spatiotemporal acquisition (VISTA) for highly accelerated cardiac MRI." MAGNETIC RESONANCE IN MEDICINE 74, no. 5, 1266 - 1278.
  • Ahmad,R; Xue,H; Giri,S; Ding,Y; Craft,J; Simonetti,OP, 2015, "Variable density incoherent spatiotemporal acquisition (VISTA) for highly accelerated cardiac MRI.." Magnetic resonance in medicine 74, no. 5, 1266 - 1278.
  • Ahmad,Rizwan; Ding,Yu; Simonetti,Orlando,P, 2015, "Edge sharpness assessment by parametric modeling: Application to magnetic resonance imaging." CONCEPTS IN MAGNETIC RESONANCE PART A 44, no. 3, 138 - 149.

2014

2013

  • Golub,F; Potter,L,C; Ash,J,N; Blank,A; Ahmad,R, 2013, "Estimation of spin-echo relaxation time." JOURNAL OF MAGNETIC RESONANCE 237, 17 - 22.
  • Golub, F, Potter, LC, Ash, JN, Blank, A, Ahmad, R, 2013, "Estimation of Spin-Echo Relaxation Time." Journal of Magnetic Resonance 237, 17 -
  • Bender, JA, Ahmad, R, Simonetti, OP, 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 -

2012

  • Palmer, J, Potter, LC, Johnson, DH, Zweier, JL, Ahmad, R, 2012, Dual-scan acquisition for accelerated continuous-wave EPR oximetry. Journal of Magnetic Resonance 222, 53 -
  • Palmer,J; Potter,L,C; Johnson,D,H; Zweier,J,L; Ahmad,R, 2012, "Dual-scan acquisition for accelerated continuous-wave EPR oximetry." JOURNAL OF MAGNETIC RESONANCE 222, 53 - 58.
  • Ahmad,R; Potter,L,C; Khramtsov,V,V, 2012, "Spectral modeling for accelerated pH spectroscopy using EPR." JOURNAL OF MAGNETIC RESONANCE 218, 86 - 92.
  • Ahmad, R, Som, S, Johnson, DH., Zweier, JL, Kuppusamy, P, Potter, LC, 2012, "Multisite EPR oximetry from multiple quadrature harmonics." Journal of Magnetic Resonance 214, no. 1, 135 -
  • Ahmad, R, Potter, LC, Khramtsov, VV, 2012, Spectral modeling for accelerated pH spectroscopy using EPR. Journal of Magnetic Resonance 218, 86 -
  • Ding, Y, Xue, H, Ahmad, R, Ting, ST, Simonetti, OP, 2012, "SC-GRAPPA: Self-constraint noniterative GRAPPA reconstruction with closed-form solution." Medical Physics 39, no. 12, 7686 -

2011

  • Palmer, J, Potter, LC, Ahmad, R, 2011, "Optimization of magnetic field sweep and field modulation amplitude for CW EPR oximetry." Journal of Magnetic Resonance 209, no. 2, 337 -

2010

  • Ahmad, R, Caia, G, Potter, LC., Petryakov, S, Kuppusamy, P, Zweier, JL, 2010, "In vivo multisite oximetry using EPR-NMR coimaging." Journal of Magnetic Resonance 207, no. 1, 69 -
  • Ahmad, R, Kuppusamy, P, 2010, Theory, instrumentation, and applications of electron paramagnetic resonance oximetry. Chemical Reviews 110, no. 5, 3212 -
  • Ahmad, R, Som, S, Kesselring, E, Kuppusamy, P, Zweier, JL, Potter, LC, 2010, "Digital detection and processing of multiple quadrature harmonics for EPR spectroscopy." Journal of Magnetic Resonance 207, no. 2, 322 -

2008

  • Vikram, DS., Ahmad, R, Pandian, RP, Petryakov, S, Kuppusamy, P, 2008, "Evaluation of oxygen-response times of phthalocyanine-based crystalline paramagnetic spin probes for EPR oximetry." Journal of Magnetic Resonance 193, no. 1, 127 -
  • Vikram, DS, Ahmad, R, Rivera, BK, Kuppusamy, P, 2008, "Mapping of Oxygen Concentration in Biological Samples Using EPR Imaging." Israel Journal of Chemistry 48, no. 1, 39 -
  • Ahmad, R, Vikram, DS, Potter, LC, Kuppusamy, P, 2008, "Estimation of mean and median pO2 values for a composite EPR spectrum." Journal of Magnetic Resonance 192, no. 2, 269 -
  • Som, S, Potter, LC, Ahmad, R, Vikram, DS, Kuppusamy, P, 2008, EPR oximetry in three spatial dimensions using sparse spin distribution. Journal of Magnetic Resonance 193, no. 2, 210 -

2007

2006

Unknown

  • Rich, A, Potter, LC, Jin, N, Ash, J, Simonetti, OP, Ahmad, R, "A Bayesian model for highly accelerated phase-contrast MRI." Magnetic Resonance in Medicine
  • Ting, ST, Ahmad, R, Jin, N, Craft, J, Serafim da Silveira, J, Xue, H, Simonetti, OP, "Fast Implementation for Compressive Recovery of Highly Accelerated Cardiac Cine MRI Using the Balanced Sparse Model." Magnetic Resonance in Medicine

Presentations

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

Papers in Proceedings

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. Los Angeles, (1 2016). P335 -
  • 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. Los Angeles, (1 2016). W22 -
  • 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. Los Angeles, (1 2016). W29 -

2015

  • Ahmad, R, Schniter, P, Simonetti, OP "Parameter-Free Sparsity Adaptive Compressive Recovery (SCoRe)." in ISMRM 23rd Annual Meeting & Exhibition. Toronto, (1 2015). 3414 -
  • 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. Toronto, (1 2015). 3797 -
  • 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). Quebec City, (1 2015). 1026 - 1030.
  • 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. Toronto, (1 2015). 0188 -

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. Milan, (1 2014). 0238 -
  • 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. Milan, (1 2014). 4385 -
  • Ahmad, R, Jin, N, Ding, Y, Simonetti, OP "An Adaptive Phase Recovery Method for 4D Phase-Contrast MRI." in ISMRM 22nd Annual Meeting & Exhibition. Milan, (1 2014). 2465 -

2013

  • Golub, F, Potter, LC, Ahmad, R "Characterization of EPR spin-echo data for accelerated oximetry." in ISMRM 21st Annual Meeting & Exhibition. Salt Lake City, (1 2013). 2523 -
  • 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. Sedona, http://www.ismrm.org/workshops/Data13/program.htm, (1 2013). P -
  • Golub, F, Potter, LC, Ash, JN, Ahmad, R T2 Estimation for Spin-Echo EPR. in 41st Annual ISOTT/EPR 2013 Conference. Hanover, http://isott.org/index.php/news-reader/items/isott-2013-hanover-nh-usa.html, (1 2013). P -
  • Johnson, DH, Chen, Z, Ahmad, R, Samouilov, A, Zweier, JL "Uniform Spinning Sampling Gradient Electron Paramagnetic Resonance Imaging." in ISMRM 21st Annual Meeting & Exhibition. Salt Lake City, (1 2013). 534 -
  • 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. Sedona, (1 2013). P -
  • Johnson, DH, Ahmad, R, Samouilov, A, Zweier, JL "Uniform Spinning Sampling Gradient Electron Paramagnetic Resonance Imaging." in 41st Annual ISOTT/EPR 2013 Conference. Hanover, (1 2013). P -
  • 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. Salt Lake City, (1 2013). 3734 -
  • 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. Salt Lake City, (1 2013). 1336 -
  • 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. Hanover, (1 2013). P -
  • 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. Salt Lake City, (1 2013). 3813 -
  • 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. Salt Lake City, (1 2013). 3816 -
  • Johnson, DH, Ahmad, R, Samouilov, A, Zweier, JL "Spatial 3D EPR Imaging with Compressed Sensing Reconstruction." in 41st Annual ISOTT/EPR 2013 Conference. Hanover, (1 2013). P -
  • 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. Salt Lake City, (1 2013). 0066 -
  • Ding, Y, Ahmad, R, Xue, H, Ting, ST, Jin, N, Simonetti, OP "L1-Regularized GRAPPA Kernel Estimate." in ISMRM 21st Annual Meeting & Exhibition. Salt Lake City, (1 2013). 3826 -
  • 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. Sedona, (1 2013). P -

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. Melbourne, (1 2012). 1253 -
  • 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. Melbourne, (1 2012). 2531 -

2011

  • Ahmad, R, Austin, C, Potter, LC "Toeplitz embedding for fast iterative regularized imaging." in Proceedings SPIE: Algorithms for Synthetic Aperture Radar Imagery XVIII. Orlando, (1 2011). 80510E - 8.
  • Ahmad, R "Multisite EPR Oximetry using Multiple Field Modulation Harmonics." in 53rd Rocky Mountain Conference on Analytical Chemistry, 34th International EPR Symposium. Snowmass, (1 2011). P -

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. San Juan, (1 2010). P -
  • 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. Dallas, (1 2010). 461 -
  • 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. San Juan, (1 2010). P -

2009

  • Ahmad, R, Potter, LC, Kuppusamy, P "Oscillating Radial Trajectories for Reduced Undersampling Artifacts." in ISMRM 17th Annual Meeting & Exhibition. Honolulu, (1 2009). 575 -

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. Chicago, (1 2007). O -
  • 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. Chicago, (1 2007). P -
  • Ahmad, R, Potter, LC, Clymer, B, Zweier, JL, Kuppusamy, P "Progressive uniform distribution of EPR data." in 49th Rocky Mountain Conference for Analytical Chemistry. Breckenridge, (1 2007). 69 -

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. Seattle, Washington, USA, (1 2006). 1285 -

2005

  • Ahmad, R, Zweier, JL, Kuppusamy, P, Clymer, B "Adaptive Image Reconstruction for EPR." in ISMRM 13th Annual Meeting & Exhibition. Miami Beach, (1 2005). 2315 -
  • 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. Columbus, (1 2005). P -

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

  • 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."
  • Ahmad, R, Ash, J, Jin, N, Potter, LC, Rich, AV, Simonetti, OP. "A Bayesian Model for Highly Accelerated Phase-Contrast MRI."
  • Simonetti, OP, Ahmad, R, Potter, LC, Varghese, J. "A Magnetic Resonance Imaging Method to Non-Invasively Measure Blood Oxygen Saturation."