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Publications

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Preprints

[1] C. Chen, Y. Liu, P. Schniter, M. Tong, K. Zareba, O. Simonetti, L. Potter, and R. Ahmad, “OCMR (v1. 0)–Open-access multi-coil k-space dataset for cardiovascular magnetic resonance imaging,” arXiv preprint arXiv:2008.03410, 2020.

Journal Articles

[57] H. Dong, R. Ahmad, R. Miller, and A. Kolipaka, “MR elastography inversion by compressive recovery,” Physics in Medicine & Biology, 2021.
[56] D. Cristea, H. Wolfson, R. Ahmad, Y. Twig, P. Kuppusamy, and A. Blank, “Compact electron spin resonance skin oximeter: Properties and initial clinical results,” Magnetic Resonance in Medicine, vol. 85, no. 5, pp. 2915–2925, 2021.
[55] S. Zhao, L. C. Potter, and R. Ahmad, “High-dimensional fast convolutional framework (HICU) for calibrationless MRI,” Magnetic Resonance in Medicine, 2021. [arXiv (long version)]
[54] A. A. Pruitt, A. Rich, Y. Liu, N. Jin, L. Potter, M. Tong, S. Rajpal, O. Simonetti, and R. Ahmad, “Fully self-gated whole-heart 4D flow imaging from a 5-minute scan,” Magnetic Resonance in Medicine, vol. 85, no. 3, pp. 1222–1236, 2021.
[53] M. A. Bush, Y. Pan, N. Jin, Y. Liu, J. Varghese, R. Ahmad, and O. P. Simonetti, “Prospective correction of patient-specific respiratory motion in myocardial T1 and T2 mapping,” Magnetic Resonance in Medicine, vol. 85, no. 2, pp. 855–867, 2021.
[52] D. A. Komarov, A. Samouilov, R. Ahmad, and J. L. Zweier, “Algebraic reconstruction of 3D spatial EPR images from high numbers of noisy projections: An improved image reconstruction technique for high resolution fast scan EPR imaging,” Journal of Magnetic Resonance, vol. 319, p. 106812, 2020.
[51] J. Varghese, M. Smyke, Y. Pan, S. Rajpal, J. Craft, L. C. Potter, S. V. Raman, R. Ahmad, and O. P. Simonetti, “Patient-adaptive magnetic resonance oximetry: Comparison with invasive catheter measurement of blood oxygen saturation inpatients with cardiovascular disease,” Journal of Magnetic Resonance Imaging, vol. 52, no. 5, pp. 1449–1459, 2020.
[50] S. D. Serai, H. H. Hu, R. Ahmad, S. White, A. Pednekar, S. A. Anupindi, and E. Y. Lee, “Newly developed methods for reducing motion artifacts in pediatric abdominal MRI: Tips and pearls,” American Journal of Roentgenology, pp. 1–12, 2020.
[49] R. Ahmad, C. A. Bouman, G. T. Buzzard, S. Chan, S. Liu, E. T. Reehorst, and P. Schniter, “Plug-and-play methods for Magnetic Resonance Imaging: Using denoisers for image recovery,” IEEE Signal Processing Magazine, vol. 37, no. 1,pp. 105–116, 2020.
[48] P. Kuppusamy, M. M. Kmiec, D. Tse, J. M. Mast, and R. Ahmad, “Estimation of pO2 histogram from a composite EPR spectrum of multiple random implants,” Biomedical Microdevices, vol. 22, no. 1, p. 3, 2020.
[47] J. Varghese, J. Craft, C. D. Crabtree, Y. Liu, N. Jin, K. Chow, R. Ahmad, and O. P. Simonetti, “Assessment of cardiac function, blood flow and myocardial tissue relaxation parameters at 0.35 T,” NMR in Biomedicine, vol. 33, no. 7, p. e4317, 2020.
[46] A. Rich, L. C. Potter, N. Jin, Y. Liu, O. P. Simonetti, and R. Ahmad, “A Bayesian approach for 4D flow imaging of aortic valve in a single breath-hold,” Magnetic Resonance in Medicine, vol. 81, no. 2, pp. 811–824, 2019.
[45] M. A. Bush, R. Ahmad, N. Jin, Y. Liu, and O. P. Simonetti, “Patient specific prospective respiratory motion correction for efficient, free-breathing cardiovascular MRI,” Magnetic Resonance in Medicine, vol. 81, no. 6, pp. 3662–3674, 2019.
[44] R. Ahmad, C. A. Bouman, G. T. Buzzard, S. Chan, E. T. Reehorst, and P. Schniter, “Plug and play methods for magnetic resonance imaging,” arXiv preprint arXiv:1903.08616, 2019.
[43] M. Kmiec, D. Tse, J. Mast, R. Ahmad, and P. Kuppusamy, “Implantable microchip containing oxygen-sensing paramagnetic crystals for long-term, repeated, and multisite in vivo oximetry,” Biomedical Microdevices, vol. 21, no. 71,2019.
[42] A. Rich, M. Gregg, N. Jin, Y. Liu, L. Potter, O. Simonetti, and R. Ahmad, “Cartesian sampling with variable density and adjustable temporal resolution (CAVA),” Magnetic Resonance in Medicine, 2019.
[41] A. A. Pruitt, N. Jin, Y. Liu, O. P. Simonetti, and R. Ahmad, “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, vol. 81,no. 4, pp. 2424–2438, 2019.
[40] C. Chen, Y. Liu, P. Schniter, N. Jin, J. Craft, O. Simonetti, and R. Ahmad, “Sparsity adaptive reconstruction for highly accelerated cardiac MRI,” Magnetic Resonance in Medicine, vol. 81, no. 6, pp. 3875–3887, 2019.
[39] O. Zgadzai, Y. Twig, H. Wolfson, R. Ahmad, P. Kuppusamy, and A. Blank, “Electron-spin-resonance dipstick,” Analytical Chemistry, vol. 90, no. 13, pp. 7830–7836, 2018.
[38] R. Ahmad, H. H. Hu, R. Krishnamurthy, and R. Krishnamurthy, “Reducing sedation for pediatric body MRI using accelerated and abbreviated imaging protocols,” Pediatric radiology, vol. 48, no. 1, pp. 37–49, 2018.
[37] C. Ebersole, R. Ahmad, A. V. Rich, L. C. Potter, H. Dong, and A. Kolipaka, “A Bayesian method for accelerated magnetic resonance elastography of the liver,” Magnetic Resonance in Medicine, vol. 80, no. 3, pp. 1178–1188, 2018.
[36] J. S. da Silveira, M. Smyke, A. V. Rich, Y. Liu, N. Jin, D. Scandling, J. A. Dickerson, C. E. Rochitte, S. V. Raman, L. C.Potter, R. Ahmad, and O. P. Simonetti, “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, vol. 19, no. 1, p. 35, 2017.
[35] J. Varghese, L. C. Potter, R. LaFountain, X. Pan, S. V. Raman, R. Ahmad, and O. P. Simonetti, “CMR-based blood oximetry via multi-parametric estimation using multiple T2 measurements,” Journal of Cardiovascular Magnetic Reso-nance, vol. 19, no. 1, p. 88, 2017.
[34] S. T. Ting, R. Ahmad, N. Jin, J. Craft, J. Serafim da Silveira, H. Xue, and O. P. Simonetti, “Fast implementation for compressive recovery of highly accelerated cardiac cine MRI using the balanced sparse model,” Magnetic Resonance inMedicine, vol. 77, no. 4, pp. 1505–1515, 2017.
[33] O. P. Simonetti and R. Ahmad, “Low-field cardiac magnetic resonance imaging: A compelling case for cardiac magnetic resonance’s future,” Circulation: Cardiovascular Imaging, vol. 10, no. 6, p. e005446, 2017.
[32] R. Ahmad, A. Samouilov, and J. L. Zweier, “Accelerated dynamic EPR imaging using fast acquisition and compressive recovery,” Journal of Magnetic Resonance, vol. 273, pp. 105–112, 2016.
[31] A. Rich, L. C. Potter, N. Jin, J. Ash, O. P. Simonetti, and R. Ahmad, “A Bayesian model for highly accelerated phase-contrast MRI,” Magnetic Resonance in Medicine, vol. 76, no. 2, pp. 689–701, 2016.
[30] R. Ahmad, H. Xue, S. Giri, Y. Ding, J. Craft, and O. P. Simonetti, “Variable density incoherent spatiotemporal acquisition (VISTA) for highly accelerated cardiac MRI,” Magnetic Resonance in Medicine, vol. 74, no. 5, pp. 1266–1278,2015.
[29] R. Ahmad and P. Schniter, “Iteratively reweighted l1 approaches to sparse composite regularization,” IEEE Transactions on Computational Imaging, vol. 1, no. 4, pp. 220–235, 2015.
[28] Y. Ding, H. Xue, R. Ahmad, T.-c. Chang, S. T. Ting, and O. P. Simonetti, “Paradoxical effect of the signal-to-noise ratio of GRAPPA calibration lines: A quantitative study,” Magnetic Resonance in Medicine, vol. 74, no. 1, pp. 231–239,2015.
[27] R. Ahmad, Y. Ding, and O. P. Simonetti, “Edge sharpness assessment by parametric modeling: application to magnetic resonance imaging,” Concepts in Magnetic Resonance Part A, vol. 44, no. 3, pp. 138–149, 2015.
[26] H. Woflson, R. Ahmad, Y. Twig, B. Williams, and A. Blank, “A magnetic resonance probehead for evaluating the level of ionizing radiation absorbed in human teeth,” Health Physics, vol. 108, no. 3, pp. 326–335, 2015.
[25] D. H. Johnson, R. Ahmad, Y. Liu, Z. Chen, A. Samouilov, and J. L. Zweier, “Uniform spinning sampling gradient electron paramagnetic resonance imaging,” Magnetic Resonance in Medicine, vol. 71, no. 2, pp. 893–900, 2014.
[24] H. Wolfson, R. Ahmad, Y. Twig, P. Kuppusamy, and A. Blank, “A miniature electron spin resonance probehead for transcutaneous oxygen monitoring,” Applied Magnetic Resonance, vol. 45, no. 10, pp. 955–967, 2014.
[23] D. H. Johnson, R. Ahmad, G. He, A. Samouilov, and J. L. Zweier, “Compressed sensing of spatial electron paramagnetic resonance imaging,” Magnetic Resonance in Medicine, vol. 72, no. 3, pp. 893–901, 2014.
[22] J. A. Bender, R. Ahmad, and O. P. Simonetti, “The importance of k-space trajectory on off-resonance artifact in segmented echo-planar imaging,” Concepts in Magnetic Resonance Part A, vol. 42, no. 2, pp. 23–31, 2013.
[21] F. Golub, L. C. Potter, J. N. Ash, A. Blank, and R. Ahmad, “Estimation of spin-echo relaxation time,” Journal of Magnetic Resonance, vol. 237, pp. 17–22, 2013.
[20] R. Ahmad, S. Som, D. H. Johnson, J. L. Zweier, P. Kuppusamy, and L. C. Potter, “Multisite EPR oximetry from multiple quadrature harmonics,” Journal of Magnetic Resonance, vol. 214, pp. 135–143, 2012.
[19] J. Palmer, L. C. Potter, D. H. Johnson, J. L. Zweier, and R. Ahmad, “Dual-scan acquisition for accelerated continuous-wave EPR oximetry,” Journal of Magnetic Resonance, vol. 222, pp. 53–58, 2012.
[18] Y. Ding, H. Xue, R. Ahmad, S. T. Ting, and O. P. Simonetti, “SC-GRAPPA: Self-constraint noniterative grappa reconstruction with closed-form solution,” Medical Physics, vol. 39, no. 12, pp. 7686–7693, 2012.
[17] R. Ahmad, L. C. Potter, and V. V. Khramtsov, “Spectral modeling for accelerated PH spectroscopy using EPR,” Journal of Magnetic Resonance, vol. 218, pp. 86–92, 2012.
[16] J. Palmer, L. C. Potter, and R. Ahmad, “Optimization of magnetic field sweep and field modulation amplitude for continuous-wave EPR oximetry,” Journal of Magnetic Resonance, vol. 209, no. 2, pp. 337–340, 2011.
[15] R. Ahmad and P. Kuppusamy, “Theory, instrumentation, and applications of electron paramagnetic resonance oximetry,” Chemical Reviews, vol. 110, no. 5, pp. 3212–3236, 2010.
[14] R. Ahmad, S. Som, E. Kesselring, P. Kuppusamy, J. L. Zweier, and L. C. Potter, “Digital detection and processing of multiple quadrature harmonics for EPR spectroscopy,” Journal of Magnetic Resonance, vol. 207, no. 2, pp. 322–331,2010.
[13] R. Ahmad, G. Caia, L. C. Potter, S. Petryakov, P. Kuppusamy, and J. L. Zweier, “In vivo multisite oximetry using EPR–NMR coimaging,” Journal of Magnetic Resonance, vol. 207, no. 1, pp. 69–77, 2010.
[12] S. Som, L. C. Potter, R. Ahmad, D. S. Vikram, and P. Kuppusamy, “EPR oximetry in three spatial dimensions using sparse spin distribution,” Journal of Magnetic Resonance, vol. 193, no. 2, pp. 210–217, 2008.
[11] D. S. Vikram, R. Ahmad, B. K. Rivera, and P. Kuppusamy, “Mapping of oxygen concentration in biological samplesusing EPR imaging,” Israel Journal of Chemistry, vol. 48, no. 1, pp. 39–43, 2008.
[10] D. S. Vikram, R. Ahmad, R. P. Pandian, S. Petryakov, and P. Kuppusamy, “Evaluation of oxygen-response times of phthalocyanine-based crystalline paramagnetic spin probes for EPR oximetry,” Journal of Magnetic Resonance, vol. 193,no. 1, pp. 127–132, 2008.
[9] R. Ahmad, D. S. Vikram, L. C. Potter, and P. Kuppusamy, “Estimation of mean and median pO2 values for a composite EPR spectrum,” Journal of Magnetic Resonance, vol. 192, no. 2, pp. 269–274, 2008.
[8] R. Ahmad, B. Clymer, D. S. Vikram, Y. Deng, H. Hirata, J. L. Zweier, and P. Kuppusamy, “Enhanced resolution for EPR imaging by two-step deblurring,” Journal of Magnetic Resonance, vol. 184, no. 2, pp. 246–257, 2007.
[7] R. Ahmad, Y. Deng, D. S. Vikram, B. Clymer, P. Srinivasan, J. L. Zweier, and P. Kuppusamy, “Quasi monte carlo-based isotropic distribution of gradient directions for improved reconstruction quality of 3D EPR imaging,” Journal of Magnetic Resonance, vol. 184, no. 2, pp. 236–245, 2007.
[6] S. Som, L. C. Potter, R. Ahmad, and P. Kuppusamy, “A parametric approach to spectral–spatial EPR imaging,” Journal of Magnetic Resonance, vol. 186, no. 1, pp. 1–10, 2007.
[5] R. Ahmad, D. S. Vikram, B. Clymer, L. C. Potter, Y. Deng, P. Srinivasan, J. L. Zweier, and P. Kuppusamy, “Uniform distribution of projection data for improved reconstruction quality of 4D EPR imaging,” Journal of Magnetic Resonance,vol. 187, no. 2, pp. 277–287, 2007.
[4] D. S. Vikram, A. Bratasz, R. Ahmad, and P. Kuppusamy, “A comparative evaluation of EPR and oxylite oximetry usinga random sampling of pO2 in a murine tumor,” Radiation Research, vol. 168, no. 3, pp. 308–315, 2007.
[3] Y. Deng, R. P. Pandian, R. Ahmad, P. Kuppusamy, and J. L. Zweier, “Application of magnetic field over-modulation for improved EPR linewidth measurements using probes with Lorentzian lineshape,” Journal of Magnetic Resonance,vol. 181, no. 2, pp. 254–261, 2006.
[2] R. Ahmad, B. Clymer, Y. Deng, G. He, D. Vikram, P. Kuppusamy, and J. L. Zweier, “Optimization of data acquisition for EPR imaging,” Journal of Magnetic Resonance, vol. 179, no. 2, pp. 263–272, 2006.
[1] R. Ahmad, D. S. Vikram, S. Petryakov, Y. Deng, J. L. Zweier, P. Kuppusamy, and B. Clymer, “Automated on-the-fly detection and correction procedure for EPR imaging data acquisition,” Magnetic Resonance in Medicine, vol. 56, no. 3,pp. 644–653, 2006

Book Chapters

[3] R. Ahmad and P. Schniter, “Recovering signals with unknown sparsity in multiple dictionaries,” in Compressed Sensing and its Applications, pp. 163–195, Springer, 2017.
[2] R. Ahmad and P. Kuppusamy, “EPR imaging: Theory and instrumentation,” Multifrequency Electron Paramagnetic Resonance: Theory and Applications, pp. 755–793, 2011.
[1] R. Ahmad, M. Khan, D. Vikram, A. Bratasz, and P. Kuppusamy, “EPR oximetry: Method and application,” Methods in Redox Signaling, pp. 19–23, 01 2010.

Conference Proceedings and Abstracts

[25] C. Chen, Y.Liu, O. P. Simonetti, and R. Ahmad, “Automatic extraction and sign determination of respiratory signal in real-time cardiac Magnetic Resonance Imaging,” in arXiv preprint arXiv:2002.03216, 2020.
[24] S. Liu, E. Reehorst, P. Schniter, and R. Ahmad, “Free-breathing cardiovascular MRI using a plug-and-play method with learned denoiser,” in arXiv preprint arXiv:2002.03226, 2020.
[23] S. Zhao, L. C. Potter, K. Lee, and R. Ahmad, “Convolutional framework for accelerated Magnetic Resonance Imaging,” in arXiv preprint arXiv:2002.03225, 2020.
[22] J. S. da Silveira, A. V. Rich, Y. Liu, M. Smyke, N. Jin, D. Scandling, J. A. Dickerson, C. E. Rochitte, S. V. Raman, L. C. Potter, et al., “Highly accelerated phase-contrast MRI-based multi-directional flow imaging for peak velocity estimation in aortic stenosis patients.,” Journal of Cardiovascular Magnetic Resonance, vol. 18, no. S1, p. W22, 2016.
[21] J. S. da Silveira, M. E. Smyke, R. Ahmad, N. Jin, D. Scandling, J. A. Dickerson, C. E. Rochitte, S. V. Raman, and O. P. Simonetti, “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,” Journal of Cardiovascular Magnetic Resonance, vol. 18, no. 1, p. P335, 2016.
[20] J. Varghese, R. Ahmad, N. Jin, L. C. Potter, and O. P. Simonetti, “Venous oxygen saturation estimation from multiple t2 maps with varying inter-echo spacing,” Journal of Cardiovascular Magnetic Resonance, vol. 18, no. 1, p. W29, 2016.
[19] J. Varghese, R. Ahmad, L. C. Potter, and O. P. Simonetti, “Non-invasive blood oxygen saturation measurement by a calibration-free MRI method,” Circulation, vol. 134, no. suppl 1, pp. A15125–A15125, 2016.
[18] S. T. Ting, R. Ahmad, N. Jin, and O. P. Simonetti, “Patch-based, iteratively-reweighted compressive recovery for reconstruction of highly accelerated exercise stress cardiac cine,” Journal of Cardiovascular Magnetic Resonance, vol. 18, no. 422, 2016.
[17] H. Wolfson, R. Ahmad, Y. Twig, A. Blank, and P. Kuppusamy, “A hand-held EPR scanner for transcutaneous oximetry,” in Medical Imaging 2015: Biomedical Applications in Molecular, Structural, and Functional Imaging, vol. 9417, p. 941706, International Society for Optics and Photonics, 2015.
[16] J. S. Da Silveira, M. Smyke, N. Jin, R. Ahmad, L. Jafari, D. Scandling, J. A. Dickerson, S. V. Raman, and O. P. Simonetti, “Aortic stenosis assessment with a 3-directional phase contrast magnetic resonance technique. comparison to transthoracic echocardiography,” Journal of Cardiovascular Magnetic Resonance, vol. 17, no. 1, p. P381, 2015.
[15] A. Rich, L. C. Potter, J. N. Ashi, and R. Ahmad, “Factor graphs for inverse problems: Accelerated phase contrast magnetic resonance imaging,” in 2015 IEEE International Conference on Image Processing (ICIP), pp. 1026–1030, IEEE, 2015.
[14] R. Ahmad, P. Schniter, and O. P. Simonetti, “Parameter-free sparsity adaptive compressive recovery (score),” in ISMRM 23rd Annual Meeting & Exhibition in Toronto, Ontario, Canada, p. 3414, 2015.
[13] R. Ahmad, N. Jin, Y. Ding, and O. P. Simonetti, “An adaptive phase recovery method for 4D phase-contrast MRI,” in Joint Annual Meeting ISMRM-ESMRMB in Milan, Italy, p. 2465, 2014.
[12] D. G. Gungor, R. Ahmad, and L. C. Potter, “A subspace approach to blind coil sensitivity estimation in parallel MRI,” Journal of Cardiovascular Magnetic Resonance, vol. 16, no. 1, p. W1, 2014.
[11] R. Ahmad, S. T. Ting, J. Craft, S. Giri, N. Jin, S. V. Raman, and O. P. Simonetti, “High-resolution, real-time exercise stress cine,” Journal of Cardiovascular Magnetic Resonance, vol. 16, no. 1, p. W14, 2014.
[10] S. T. Ting, Y. Ding, S. Giri, N. Jin, O. P. Simonetti, and R. Ahmad, “Sub-30 ms real-time, free-breathing cardiac imaging with spirit,” Journal of Cardiovascular Magnetic Resonance, vol. 16, no. S1, p. W2, 2014.
[9] Y. Ding, R. Ahmad, H. Xue, S. Ting, N. Jin, and O. P. Simonetti, “Comparing boundary sharpness of sense and grappa,” in ISMRM Workshop on Data Sampling and Image Reconstruction. Sedona, AZ, 2013.
[8] R. Ahmad, H. Xue, Y. Ding, and O. P. Simonetti, “Variable density incoherent spatial-temporal acquisition (VISTA) for cardiac MRI,” in ISMRM Workshop on Data Sampling and Image Reconstruction. Sedona, AZ, 2013.
[7] R. Ahmad, C. D. Austin, and L. C. Potter, “Toeplitz embedding for fast iterative regularized imaging,” in Algorithms for Synthetic Aperture Radar Imagery XVIII, vol. 8051, p. 80510E, International Society for Optics and Photonics, 2011.
[6] R. Ahmad, P. Kuppusamy, and L. C. Potter, “Nested uniform sampling for multiresolution 3-D tomography,” in 2010 IEEE International Conference on Acoustics, Speech and Signal Processing, pp. 461–464, IEEE, 2010.
[5] S. Som, L. C. Potter, R. Ahmad, D. S. Vikram, and P. Kuppusamy, “Rapid epr oximetry using sparse spin distribution,” in ISMRM 17th Annual Scientific Meeting & Exhibition in Honolulu, Hawai’i, USA, p. 2474, 2009.
[4] R. Ahmad, L. Potter, and P. Kuppusamy, “Oscillating radial trajectories for reduced undersampling artifacts,” in ISMRM 17th Annual Scientific Meeting & Exhibition in Honolulu, Hawai’i, USA, p. 576, 2009.
[3] D. S. Vikram, A. Bratasz, R. Ahmad, and P. Kuppusamy, “In vivo monitoring of temporal changes in tumor po2 using EPR oximetry,” in Biophysical Journal, pp. 340A–340A, 2007.
[2] Y. Deng, R. Pandian, R. Ahmad, P. Kuppusamy, and J. L. Zweier, “Application of over magnetic field modulation in EPR oximetry,” in ISMRM 14th Scientific Meeting & Exhibition in Seattle, Washington, USA, p. 1286, 2006.
[1] R. Ahmad, J. L. Zweier, P. Kuppusamy, and B. Clymer, “Adaptive image reconstruction for EPR,” in ISMRM 13th Scientific Meeting & Exhibition in Miami Beach, Florida, USA, p. 2315, 2005.

Patents

[9] A. Rich, L. C. Potter, N. Jin, J. Ash, O. P. Simonetti, and R. Ahmad, “Bayesian model for highly accelerated phase-contrast MRI,” Jan. 14 2020. US Patent 10,534,059.
[8] R. Ahmad, L. C. Potter, A. Rich, O. P. Simonetti, and S. T. Ting, “Low field magnetic resonance imaging (MRI) scanner for cardiac imaging,” July 9 2019. US Patent 10,345,408.
[7] R. Ahmad, O. P. Simonetti, and Y. Ding, “Variable density incoherent spatiotemporal acquisition (VISTA) for highly accelerated magnetic resonance imaging,” Apr. 10 2018. US Patent 9,939,509.
[6] R. Ahmad, L. C. Potter, A. Rich, O. P. Simonetti, and S. T. Ting, “Low field magnetic resonance imaging (MRI) scanner for cardiac imaging,” Jan. 23 2018. US Patent 9,874,620.
[5] R. Ahmad, N. Jin, and O. P. Simonetti, “Background phase correction for quantitative cardiovascular MRI,” Mar. 6 2018. US Patent 9,911,062.
[4] O. P. Simonetti, R. Ahmad, L. C. Potter, and J. J. Varghese, “Magnetic resonance imaging method to non-invasively measure blood oxygen saturation,” Aug. 10 2017. US Patent App. 15/416,249.
[3] A. Blank, P. Kuppusamy, and A. Rizwan, “Method and system for electron paramagnetic resonance,” Apr. 20 2017. US Patent App. 15/318,073.
[2] R. Ahmad and A. Kolipaka, “Methods for co-imaging tissue stiffness and blood flow in an MRI scan,” Nov. 23 2017. US Patent App. 15/598,661.
[1] R. Ahmad, Y. Ding, O. Simonetti, S. T. L. Ting, and H. Xue, “Self-constraint non-iterative GRAPPA reconstruction with closed-form solution,” Apr. 12 2016. US Patent 9,310,452.