
Andrew S. Nencka, PhD
Associate Professor; Associate Director, Center for Imaging Research (CIR); Section of Imaging Research, Division of Imaging Sciences
Locations
- Medical College of Wisconsin
Department of Radiology
Contact Information
Education
BS, Physics & Mathematics, Marquette University, Milwaukee, WI, 2004
Research Experience
- Data Interpretation, Statistical
- Diffusion Tensor Imaging
- Echo-Planar Imaging
- Image Enhancement
- Image Processing, Computer-Assisted
- Machine Learning
- Magnetic Resonance Imaging
- Models, Statistical
- Monte Carlo Method
- Regression Analysis
Leadership Positions
- Associate Director, Center for Imaging Research, 2016-Present
- Chair, Faculty IT Committee, 2014-2016
- Chair, Research MRI Safety Committee, 2012-Present
- Secretary, Faculty IT Committee, 2016-2017
Research Interests
One aspect of my research work has been to leverage the phase of acquired images, along with varying receive coil sensitivities, to further spatially encode the acquired data. With the assumption of real-valued images—an assumption often made for partial Fourier image reconstruction—this insight theoretically enables acceleration factors of 2N for an array of N coils. We have used this technology to implement a parallel slice acquisition method that simultaneously excites an array of slices with varying magnetization phase such that the magnetization phase and receive coil sensitivity profiles can be used to unalias the acquired slices. We have also used this technology to acquire and unalias accelerated single-slice images acquired with a single-channel body receiver coil.
Fast MR Relaxometry
Image acceleration techniques have enabled the development of a fast relaxometry pulse sequence, which we have named the gradient-recalled echo, asymmetric spin echo (GREASE) pulse sequence. The pulse sequence, including six echo-planar imaging readouts, two 90-degree excitation pulses, and two 180-degree refocusing pulses in each repetition, allows the computation of T1, T2, and T2* with each repetition. The acceleration techniques of GRAPPA and partial Fourier acquisition in the echo-planar imaging readouts reduce the duration of the imaging readout train so that signal decay does not eliminate the needed signal in later echoes. Thus, the relaxivity values for a single slice of 2 mm isotropic resolution can be acquired in less than 300 ms with this sequence. Further, the nearly simultaneous acquisition of the six images, the identical echo-planar imaging readouts, and the usage of the six images from each repetition for the estimation of relaxivity parameters allow the perfect coregistration of the computed maps.
Publications
-
Diffusion propagator metrics are biased when simultaneous multi-slice acceleration is used.
(Muftuler LT, Nencka AS, Koch KM.) Magn Reson Imaging. 2022 02;86:46-54 PMID: 34801673 SCOPUS ID: 2-s2.0-85119508656 11/22/2021
-
(Koch KM, Sherafati M, Arpinar VE, Bhave S, Ausman R, Nencka AS, Lebel RM, McKinnon G, Kaushik SS, Vierck D, Stetz MR, Fernando S, Mannem R.) Radiol Artif Intell. 2021 Nov;3(6):e200278 PMID: 34870214 PMCID: PMC8637471 SCOPUS ID: 2-s2.0-85120520485 12/07/2021
-
(Murphy SA, Furger R, Kurpad SN, Arpinar VE, Nencka A, Koch K, Budde MD.) AJNR Am J Neuroradiol. 2021 11;42(11):2101-2106 PMID: 34620590 PMCID: PMC8583257 SCOPUS ID: 2-s2.0-85119420507 10/09/2021
-
Baseline brain function in the preadolescents of the ABCD Study.
(Chaarani B, Hahn S, Allgaier N, Adise S, Owens MM, Juliano AC, Yuan DK, Loso H, Ivanciu A, Albaugh MD, Dumas J, Mackey S, Laurent J, Ivanova M, Hagler DJ, Cornejo MD, Hatton S, Agrawal A, Aguinaldo L, Ahonen L, Aklin W, Anokhin AP, Arroyo J, Avenevoli S, Babcock D, Bagot K, Baker FC, Banich MT, Barch DM, Bartsch H, Baskin-Sommers A, Bjork JM, Blachman-Demner D, Bloch M, Bogdan R, Bookheimer SY, Breslin F, Brown S, Calabro FJ, Calhoun V, Casey BJ, Chang L, Clark DB, Cloak C, Constable RT, Constable K, Corley R, Cottler LB, Coxe S, Dagher RK, Dale AM, Dapretto M, Delcarmen-Wiggins R, Dick AS, Do EK, Dosenbach NUF, Dowling GJ, Edwards S, Ernst TM, Fair DA, Fan CC, Feczko E, Feldstein-Ewing SW, Florsheim P, Foxe JJ, Freedman EG, Friedman NP, Friedman-Hill S, Fuemmeler BF, Galvan A, Gee DG, Giedd J, Glantz M, Glaser P, Godino J, Gonzalez M, Gonzalez R, Grant S, Gray KM, Haist F, Harms MP, Hawes S, Heath AC, Heeringa S, Heitzeg MM, Hermosillo R, Herting MM, Hettema JM, Hewitt JK, Heyser C, Hoffman E, Howlett K, Huber RS, Huestis MA, Hyde LW, Iacono WG, Infante MA, Irfanoglu O, Isaiah A, Iyengar S, Jacobus J, James R, Jean-Francois B, Jernigan T, Karcher NR, Kaufman A, Kelley B, Kit B, Ksinan A, Kuperman J, Laird AR, Larson C, LeBlanc K, Lessov-Schlagger C, Lever N, Lewis DA, Lisdahl K, Little AR, Lopez M, Luciana M, Luna B, Madden PA, Maes HH, Makowski C, Marshall AT, Mason MJ, Matochik J, McCandliss BD, McGlade E, Montoya I, Morgan G, Morris A, Mulford C, Murray P, Nagel BJ, Neale MC, Neigh G, Nencka A, Noronha A, Nixon SJ, Palmer CE, Pariyadath V, Paulus MP, Pelham WE, Pfefferbaum D, Pierpaoli C, Prescot A, Prouty D, Puttler LI, Rajapaske N, Rapuano KM, Reeves G, Renshaw PF, Riedel MC, Rojas P, de la Rosa M, Rosenberg MD, Ross MJ, Sanchez M, Schirda C, Schloesser D, Schulenberg J, Sher KJ, Sheth C, Shilling PD, Simmons WK, Sowell ER, Speer N, Spittel M, Squeglia LM, Sripada C, Steinberg J, Striley C, Sutherland MT, Tanabe J, Tapert SF, Thompson W, Tomko RL, Uban KA, Vrieze S, Wade NE, Watts R, Weiss S, Wiens BA, Williams OD, Wilbur A, Wing D, Wolff-Hughes D, Yang R, Yurgelun-Todd DA, Zucker RA, Potter A, Garavan HP, ABCD Consortium.) Nat Neurosci. 2021 08;24(8):1176-1186 PMID: 34099922 PMCID: PMC8947197 SCOPUS ID: 2-s2.0-85107821826 06/09/2021
-
(Nencka AS, Arpinar VE, Bhave S, Yang B, Banerjee S, McCrea M, Mickevicius NJ, Muftuler LT, Koch KM.) Magn Reson Med. 2021 06;85(6):3272-3280 PMID: 33331002 SCOPUS ID: 2-s2.0-85097598109 12/18/2020
-
(Struck AF, Boly M, Hwang G, Nair V, Mathis J, Nencka A, Conant LL, DeYoe EA, Raghavan M, Prabhakaran V, Binder JR, Meyerand ME, Hermann BP.) Epilepsy Behav. 2021 04;117:107841 PMID: 33611101 PMCID: PMC8035304 SCOPUS ID: 2-s2.0-85100881402 02/22/2021
-
Acute Post-Concussive Assessments of Brain Tissue Magnetism Using Magnetic Resonance Imaging.
(Koch KM, Nencka AS, Swearingen B, Bauer A, Meier TB, McCrea M.) J Neurotrauma. 2021 04 01;38(7):848-857 PMID: 33066712 PMCID: PMC8432603 SCOPUS ID: 2-s2.0-85103782270 10/18/2020
-
Value CMR: Towards a Comprehensive, Rapid, Cost-Effective Cardiovascular Magnetic Resonance Imaging.
(Ibrahim EH, Frank L, Baruah D, Arpinar VE, Nencka AS, Koch KM, Muftuler LT, Unal O, Stojanovska J, Rubenstein JC, Brown SA, Charlson J, Gore EM, Bergom C.) Int J Biomed Imaging. 2021;2021:8851958 PMID: 34054936 PMCID: PMC8147553 SCOPUS ID: 2-s2.0-85107219799 06/01/2021
-
Optimization of hyperparameters for SMS reconstruction.
(Muftuler LT, Arpinar VE, Koch K, Bhave S, Yang B, Kaushik S, Banerjee S, Nencka A.) Magn Reson Imaging. 2020 11;73:91-103 PMID: 32835848 SCOPUS ID: 2-s2.0-85089907300 08/25/2020
-
(Ibrahim EH, Arpinar VE, Muftuler LT, Stojanovska J, Nencka AS, Koch KM.) World J Radiol. 2020 Oct 28;12(10):231-246 PMID: 33240463 PMCID: PMC7653183 11/27/2020
-
(Bukowy JD, Foss H, McGarry SD, Lowman AK, Hurrell SL, Iczkowski KA, Banerjee A, Bobholz SA, Barrington A, Dayton A, Unteriner J, Jacobsohn K, See WA, Nevalainen MT, Nencka AS, Ethridge T, Jarrard DF, LaViolette PS.) J Med Imaging (Bellingham). 2020 Sep;7(5):057501 PMID: 33062803 PMCID: PMC7550797 10/17/2020
-
(McGarry SD, Bukowy JD, Iczkowski KA, Lowman AK, Brehler M, Bobholz S, Nencka A, Barrington A, Jacobsohn K, Unteriner J, Duvnjak P, Griffin M, Hohenwalter M, Keuter T, Huang W, Antic T, Paner G, Palangmonthip W, Banerjee A, LaViolette PS.) J Med Imaging (Bellingham). 2020 Sep;7(5):054501 PMID: 32923510 PMCID: PMC7479263 SCOPUS ID: 2-s2.0-85096616055 09/15/2020