Florian Knoll

Florian Knoll, PhD
Assistant Professor of Radiology
Function: 
Key Personnel
Affiliation: 
CAI²R
Phone: 
(212) 263 0335
Fax: 
212-263-7541
Address: 
4th Floor 660 First Avenue New York, NY 10016
Educational Details: 
  • 2007 – 2011    PhD Studies, Electrical Engineering, Graz University of Technology
  • 2001 – 2006    Studies of Electrial Engineering, Graz University of Technology
Research Interest: 
  • Iterative Image Reconstruction including Parallel Imaging and Compressed Sensing
  • Non-Cartesian Imaging
  • Inverse Problems
  • High Performance Computing using GPUs
Selected Publications: 

Journal publications

Conference Proceedings

  • Knoll F,  Holler M, Koesters T, Cloos M, Otazo R,  Bredies K,  Sodickson D:  Simultaneous Multi-Modality/multi-Contrast Image Reconstruction with Nuclear-Norm TGV. Proc. Intl. Soc. Mag. Reson. Med. 24:873 (2016).
  • Hammernik K,  Knoll F,  Sodickson D,  Pock, T:  Learning a Variational Model for Compressed Sensing MRI Reconstruction. Proc. Intl. Soc. Mag. Reson. Med. 24:1088 (2016).
    Cloos M,  Zhao T,  Knoll F,  Sodickson D:  Online Radial Multiband Magnetic Resonance Fingerprinting. Proc. Intl. Soc. Mag. Reson. Med. 24:608 (2016).
  • Knoll F, Holler M, Koesters T, Bredies K, Sodickson D: Simultaneous PET-MRI reconstruction with vectorial second order total generalized variation. 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (in press).
  • Rasch J, Brinkmann EM, Wuebbeling F, Knoll F, Koesters T, Burger M. PET-MRI Joint Reconstruction via Multichannel
    Bregman-TV. 2015 IEEE Nuclear Science Symposium and Medical Imaging Conference (in press).
  • Raya J.G.; Knoll, F.:  Non-Linear Phase Correction in Model-Based Reconstruction of the Diffusion Tensor. Proc. Intl. Soc. Mag. Reson. Med. 23:81 (2015).
  • Cloos M.;  Zhao T.;  Knoll F.;  Alon L.;  Lattanzi R.;  Sodickson D. K.: Magnetic Resonance Fingerprint Compression. Proc. Intl. Soc. Mag. Reson. Med. 23:330 (2015).
  • Veraart J.;  Knoll F.;  Sijbers J.;  Fieremans E.;  Novikov D. S.: Gibbs Ringing Removal in Diffusion MRI Using Second Order Total Variation Minimization. Proc. Intl. Soc. Mag. Reson. Med. 23:2809 (2015).
  • Baete S.;  Raya J. G.;  Knoll F.;  Cho G. Y.;  Parasoglou P.;  Brown R.;  Block K. T.;  Otazo R.;  Bencardino J.;  Sigmund E.: Feasibility of In Vivo Dynamic Diffusion Tensor Imaging on a 3T Clinical Scanner with a Multi Echo Sequence and Compressed Sensing Reconstruction. Proc. Intl. Soc. Mag. Reson. Med. 23:2889 (2015).
  • Knoll F.;  Holler M.  Koesters T.;  Sodickson D. K.: Joint MR-PET Reconstruction Using Vector Valued Total Generalized Variation. Proc. Intl. Soc. Mag. Reson. Med. 23:3424 (2015).
  • Knoll F.; Cloos M.; Koesters T.;  Zenge M.;  Otazo R.;  Sodickson D. K.: PET-MRF: One-Step 6-Minute Multi-Parametric PET-MR Imaging Using MR Fingerprinting and Multi-Modality Joint Image Reconstruction. Proc. Intl. Soc. Mag. Reson. Med. 23:3391 (2015).
  • Sodickson DK; Feng L; Knoll F; Cloos M; Ben-Eliezer N; Axel L; Chandarana H; Block T; Otazo R. The rapid imaging renaissance: sparser samples, denser dimensions, and glimmerings of a grand unified tomography. Proc. SPIE Medical Imaging, 94170G-1 - 94170G-14 (2015).
  • Knoll, F.; Koesters, T.; Otazo, R.; Block, K.T.; Feng, L.; Vunckx, K.; Faul, D.; Nuyts, J.; Boada, F.; Sodickson, D.K.: Simultaneous MR-PET Reconstruction using Multi Sensor Compressed Sensing and Joint Sparsity. Proc. Intl. Soc. Mag. Reson. Med. 22:82 (2014) (ISMRM Magna Cum Laude Award).
  • Knoll, F.; Raya, J.; O'Halloran, R.; Baete, S.; Sigmund, E.; Bammer, R.; Block, K.T.; Otazo, R.; Sodickson, D.K.: Model-based DTI reconstruction with sparsity constraints on the diffusion tensor. Proc. Intl. Soc. Mag. Reson. Med. 22:4466 (2014).
  • Knoll, F.;  Schwarzl, A.; Diwoky, C.; Sodickson, D.K.: gpuNUFFT - An open source GPU library for 3D regridding with direct Matlab interface. Proc. Intl. Soc. Mag. Reson. Med. 22:4297 (2014).
  • Raya, J.; Knoll, F.; Burcaw, L.; Milani, S.; Sodickson, D.K.; Block, K.T.: Combination of a Radial Sequence for In Vivo DTI of Articular Cartialge with an Iterative Model-Based Reconstruction. Proc. Intl. Soc. Mag. Reson. Med. 22:152 (2014).
  • Xu, J.; Feng, L.; Piccine, D.; Otazo, R.; Bonanno, G.; Knoll, F.; Wong, E.K.; Sodickson, D.K.: Feasibility of Free-Breathing Whole Heart Coronary MRA in Less Than 3 Minutes Using Combination of Compressed Sensing, Parallel Imaging and a 3D Radial Phyllotaxis Trajectory. Proc. Intl. Soc. Mag. Reson. Med. 22:937 (2014).
  • Carluccio, G.; Knoll, F.; Deniz, C.M.; Alon, L.; Collins, C.: A Fast Method to Estimate SAR Distribution from Temperature Images Highly Affected by Noise. Proc. Intl. Soc. Mag. Reson. Med. 22:4904 (2014).
  • Kroboth S.; Knoll F.; Bredies K.: Fast Regularized Reconstruction for PatLoc MR Imaging using Total Generalized Variation and GPUs. 16 Ann. Meet. Ger. Chapter Int. Soc. Magn. Reson. Med. 2013, Freiburg.
  • Knoll, F.; Block, K.T.; Bredies, K.; Diwoky, C.; Axel, L.; Sodickson, D.K.; Stollberger, R.: Accelerated 3D radial imaging with 3D variational regularization. Proc. Intl. Soc. Mag. Reson. Med. 21:2636 (2013) (ISMRM Magna Cum Laude Award).
  • Knoll, F.; Valkonen, T.; Bredies, K.; Stollberger, R.: Higher order variational denoising for diffusion tensor imaging. Proc. Intl. Soc. Mag. Reson. Med. 21:2078 (2013) (ISMRM Magna Cum Laude Award).
  • Knoll, F.; O'Halloran, R.; Bredies, K.; Stollberger, R.; Bammer, R.: Quantitative Evaluation of 3D Variational Regularized Reconstruction of Undersampled Diffusion Tensor Imaging. Proc. Intl. Soc. Mag. Reson. Med. 21:2615 (2013).
  • Schloegl, M.; Knoll, F.; Gruber, K.; Ebner, F.; Stollberger, R.: Quantitative Evaluation of non-linear Reconstruction Methods in MRI. Proc. Intl. Soc. Mag. Reson. Med. 21:2665 (2013).
  • O'Halloran, R.; Knoll, F.;  Bredies, K.; Stollberger, R.; Bammer, R.: Scan time reduction in 3D Diffusion-Weighted Steady-State Free Precession Imaging using Constrained Reconstruction. Proc. Intl. Soc. Mag. Reson. Med. 21:3182 (2013).
  • Kroboth, S.; Testud, F.; Bredies, K.; Layton, K.J.; Gallichan, D.; Cocosco, C.A.; Schultz, G.; Knoll, F.; Barmet, C.; Pruessmann, K.P.; Zaitsev, M.; Stollberger R.: Image Reconstruction of Single-Shot North West EPI Data acquired with PatLoc Gradients using Magnetic Field Monitoring and Total Generalized Variation – Conjugate Gradient. Proc. Intl. Soc. Mag. Reson. Med. 21:3827 (2013).
  • Kristian Bredies, Florian Knoll and Christian Langkammer. TGV regularization for variational approaches to quantitative susceptibility mapping. Proceedings of the 2nd International Workshop on MRI Phase Contrast & Quantitative Susceptibility Mapping (QSM). Ithaca, New York (USA), pp. 45-48, 2013.
  • Knoll, F.; Clason, C.; Bredies, K.; Stollberger, R.: Iterative Image reconstruction for accelerated MR-Imaging: Mathematics meets Radiology: Strahlentherapie und Onkologie 189 (2), 184-185 (2013).
  • Valkonen T., Knoll F; Bredies K.: TGV for diffusion tensors: A comparison of fidelity functions, in: Journal of Inverse and Ill-posed Problems, Special issue for IP:M&S 2012, Antalya, Turkey, 21 (2013), 355–377.
  • Kroboth S.; Gallichan D.; Knoll F.; Cocosco C.A.; Schultz G.; Zaitsev M.; Stollberger R.: Effect of miscalibration of gradient fields and RF coil sensitivities in PatLoc imaging. Proc. ESMRMB 152-153 (2012).
  • Knoll F.; Schultz, G.; Bredies, K.; Gallichan, D.; Zaitsev, M.; Hennig, J.; Stollberger, R.: Reconstruction of undersampled radial PatLoc imaging using Total Generalized Variation. Proc. Intl. Soc. Mag. Reson. Med. 20:3345 (2012).
  • Sumpf, T.; Knoll, F.; Frahm, J.; Stollberger, R.; Petrovic, A.: Nonlinear inverse reconstruction for T2 mapping using the generating function formalism on undersampled Cartesian data. Proc. Intl. Soc. Mag. Reson. Med. 20:5578 (2012).
  • Knoll, F.; Clason, C.; Bredies, K.; Uecker, M.; Stollberger, R.: Parallel Imaging with Nonlinear Reconstruction using Variational Penalties. Proc. Intl. Soc. Mag. Reson. Med. 19:485 (2011).
  • Knoll, F.; Bredies, K.; Stollberger, R.: Iterative parallel imaging reconstruction of time-resolved data using 3D variational regularization. Proc. Intl. Soc. Mag. Reson. Med. 19:2883 (2011).
  • Knoll, F.; Freiberger, M.; Bredies, K.; Stollberger, R.: AGILE: An open source library for image reconstruction using graphics card hardware acceleration. Proc. Intl. Soc. Mag. Reson. Med. 19:2554 (2011).
  • Knoll, F.; Dong, Y.; Hintermüller, M.; Stollberger, R.: Total Variation Denoising with Spatially Dependent Regularization. Proc. Intl. Soc. Mag. Reson. Med. 18:5088 (2010).
  • Buchgraber, G.; Knoll, F.; Freiberger, M.; Clason, C.; Grabner, M.; Stollberger, R.: Fast Regridding using LSQR on Graphics Hardware. Proc. Intl. Soc. Mag. Reson. Med. 18:4959 (2010).
  • Knoll, F.; Bredies, K.; Pock, T.; Stollberger, R.: Total Generalized Variation (TGV) for MRI. Proc. Intl. Soc. Mag. Reson. Med. 18:4855 (2010).
  • Knoll, F.; Clason, C.; Aschauer, M.; Ebner, F.; Stollberger, R.: Adapted Random 3D Sampling Patterns for CE-MRA. Proc. Intl. Soc. Mag. Reson. Med. 18:3763 (2010).
  • Knoll, F.; Clason, C.; Stollberger, R.: Tailored 3D Random Sampling Patterns for Nonlinear Parallel Imaging. Proc. Intl. Soc. Mag. Reson. Med. 18:2876 (2010).
  • Diwoky, C.; Reinisch, A.; Knoll, F.; Neumayer, B.; Strunk, D.; Stollberger, R.: On Possible Pitfalls in Working on SPIO Labelled Cells with 2D UTE Sequences. Proc. Intl. Soc. Mag. Reson. Med. 18:1875 (2010).
  • Kraiger, M.; Knoll, F.; Clason, C.; Stollberger, R.: Quantification of Transversal Relaxation Time T2 using an Iterative Regularized Parallel Imaging Reconstruction. Proc. Intl. Soc. Mag. Reson. Med. 18:2954 (2010).
  • Knoll, F.; Bredies, K.; Stollberger, R.: MR Image Reconstruction of Subsampled Spiral Data from Multiple Coils using Total Generalized Variation. Biomed Tech 55 (Suppl. 1): 184 - 188 (2010).
  • Knoll, F.; Dong, Y.; Hintermüller, M.; Stollberger, R.: Automatic Spatially Dependent Parameter Selection for TV Denoising of MR Images with Non-Uniform Noise Distribution. Biomed Tech 55 (Suppl. 1): 198 - 202 (2010).
  • Kraiger, M.; Knoll, F.; Clason, C.; Stollberger, R.: Assessment of Iterative Regularized Parallel Imaging Reconstruction for Quantitative Magnetic Resonance Imaging. BMT 2010: Biomed Tech 55 (Suppl. 1): 234 - 237 (2010).
  • Knoll, F.; Clason, C.; Uecker, M.; Stollberger, R.: Improved Reconstruction in Non-Cartesian Parallel Imaging by Regularized Nonlinear Inversion. Proc. Intl. Soc. Mag. Reson. Med. 17:2721 (2009).
  • Knoll, F.; Unger, M.; Ebner, F.; Stollberger, R.: Real-Time Elimination of Undersampling Artifacts using 3D Total Variation on Graphics Hardware. Proc. Intl. Soc. Mag. Reson. Med. 17:2838 (2009).
  • Knoll, F.; Clason. C.; Ebner, F.; Aschauer, M.; Stollberger, R.: CE-MRA with tailored 3D random sampling patterns and nonlinear parallel imaging reconstruction, 21th annual international conference on magnetic resonance angiography, East Lansing, Michigan, USA, September 29 - Oktober 1 (2009).
  • Knoll, F.: Towards real-time MR imaging: Data acquisition strategies and image reconstruction, Conference on applied Inverse Problems, Minisymposium: Magnetic Resonance and Magnetic Induction Tomography; Vienna, July 20 - July 24 (2009).
  • Knoll, F.; Unger, M.; Ebner, F.; Stollberger, R.: Real time elimination of undersampling artifacts in CE MRA using variational denoising on graphics hardware, 20th annual international conference on magnetic resonance angiography: p71, Graz, Austria, October 15 - October 18 (2008).
  • Knoll, F.; Ebner, F.; Keeling, S.; Stollberger, R.: Assessment of image reconstruction methods for subsampled DCE-MRI. Proc. Intl. Soc. Mag. Reson. Med. 16:3263 (2008).

Thesis

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Additional Information: 

Sponsors

Philanthropic Support

We gratefully acknowledge generous support for radiology research at NYU Langone Health from:
 
• The Big George Foundation
• Raymond and Beverly Sackler
• Bernard and Irene Schwartz

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