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pro vyhledávání: '"Dwork, Nicholas"'
With Fourier sensing, it is commonly the case that the field-of-view (FOV), the area of space to be imaged, is known prior to reconstruction. To date, reconstruction algorithms have focused on FOVs with simple geometries: a rectangle or a hexagon. Th
Externí odkaz:
http://arxiv.org/abs/2406.16214
Autor:
Dwork, Nicholas, Englund, Erin K.
Compressed sensing is an imaging paradigm that allows one to invert an underdetermined linear system by imposing the a priori knowledge that the sought after solution is sparse (i.e., mostly zeros). Previous works have shown that if one also knows so
Externí odkaz:
http://arxiv.org/abs/2312.01610
Parallel imaging with linear predictability takes advantage of information present in multiple receive coils to accurately reconstruct the image with fewer samples. Commonly used algorithms based on linear predictability include GRAPPA and SPIRiT. We
Externí odkaz:
http://arxiv.org/abs/2301.07256
Autor:
Rajagopal, Abhejit, Leynes, Andrew P., Dwork, Nicholas, Scholey, Jessica E., Hope, Thomas A., Larson, Peder E. Z.
In this paper, we review physics- and data-driven reconstruction techniques for simultaneous positron emission tomography (PET) / magnetic resonance imaging (MRI) systems, which have significant advantages for clinical imaging of cancer, neurological
Externí odkaz:
http://arxiv.org/abs/2206.06788
Autor:
Dwork, Nicholas, Larson, Peder E. Z.
The discrete curvelet transform decomposes an image into a set of fundamental components that are distinguished by direction and size as well as a low-frequency representation. The curvelet representation is approximately sparse; thus, it is a useful
Externí odkaz:
http://arxiv.org/abs/2107.11664
Autor:
Dwork, Nicholas, O'Connor, Daniel, Johnson, Ethan M. I., Baron, Corey A., Gordon, Jeremy W., Pauly, John M., Larson, Peder E. Z.
The Gridding algorithm has shown great utility for reconstructing images from non-uniformly spaced samples in the Fourier domain in several imaging modalities. Due to the non-uniform spacing, some correction for the variable density of the samples mu
Externí odkaz:
http://arxiv.org/abs/2106.06660
Autor:
Dwork, Nicholas, Kerr, Adam B., Johnson, Ethan M. I., Baron, Corey A., Vasanawala, Shreyas S., Larson, Peder E. Z., Bush, Adam M., Pauly, John
We propose multiMap, a single scan that can generate several quantitative maps simultaneously. The sequence acquires multiple images in a time-efficient manner, which can be modeled for T_2, T2*, main- and transmit-field inhomogeneity, T_1:equilibriu
Externí odkaz:
http://arxiv.org/abs/2007.15495
Autor:
Dwork, Nicholas, Johnson, Ethan M. I., O'Connor, Daniel, Gordon, Jeremy W., Kerr, Adam B., Baron, Corey A., Pauly, John M., Larson, Peder E. Z.
With the advent of multi-coil imaging and compressed sensing, a number of model based reconstruction algorithms have been created. They incorporate a multitude of different regularization functions based on physics, observed phenomenology, and heuris
Externí odkaz:
http://arxiv.org/abs/2007.00165
Autor:
Dwork, Nicholas, Baron, Corey A., Johnson, Ethan M. I., O'Connor, Daniel, Pauly, John M., Larson, Peder E. Z.
Publikováno v:
Magnetic Resonance Imaging 77 (2021): 186-193
We present a fast method for generating random samples according to a variable density Poisson-disc distribution. A minimum threshold distance is used to create a background grid array for keeping track of those points that might affect any new candi
Externí odkaz:
http://arxiv.org/abs/2004.06789
Autor:
Dwork, Nicholas, Gordon, Jeremy W., Tang, Shuyu, O'Connor, Daniel, Hansen, Esben Sovso Szocska, Laustsen, Christoffer, Larson, Peder E. Z.
Publikováno v:
Magnetic Resonance Materials in Physics, Biology and Medicine (2021): 1-16
Magnetic resonance imaging with hyperpolarized contrast agents can provide unprecedented \textit{in-vivo} measurements of metabolism, but yields images that are lower resolution than that achieved with proton anatomical imaging. In order to spatially
Externí odkaz:
http://arxiv.org/abs/2003.05042