Výsledky vyhledávání - "Martin, Jonathan B."

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A Minibatch Alternating Projections Algorithm for Robust and Efficient Magnitude Least-Squares RF Pulse Design in MRI

Autor: Martin, Jonathan B., Sappo, Charlotte R., Hardy, Benjamin M., Grissom, William A.

A magnitude-least-squares radiofrequency pulse design algorithm is reported which uses interleaved exact and stochastically-generated inexact updates to escape local minima and find low-cost solutions. Inexact updates are performed using a small rand

Externí odkaz: http://arxiv.org/abs/2407.14696

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A Cryogenic Tune and Match Circuit for Magnetic Resonance Microscopy at 15.2T

Autor: Hardy, Benjamin M., Drake, Gary, Chai, Shuyang, Dhakal, Bibek, Martin, Jonathan B., Xu, Junzhong, Does, Mark D., Anderson, Adam W., Yan, Xinqiang, Gore, John C.

Signal to noise ratios (SNR) in magnetic resonance microscopy images are limited by acquisition times and the decreasing number of spins in smaller voxels. Significant SNR gains from cooling of the RF receiver are only realized when the Johnson noise

Externí odkaz: http://arxiv.org/abs/2308.13126

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Experimental demonstration of diffusion limitations on resolution and SNR in MR microscopy

Autor: Hardy, Benjamin M., Zhu, Yue, Harkins, Kevin D., Dhakal, Bibek, Martin, Jonathan B., Xie, Jingping, Xu, Junzhong, Does, Mark D., Anderson, Adam W., Gore, John C.

Magnetic resonance microscopy images at cellular resolution (< 10 microns) are limited by diffusion. SNR and spatial resolution suffer from the dephasing of transverse magnetization caused by diffusion of spins in strong gradients. Such effects may b

Externí odkaz: http://arxiv.org/abs/2301.00727

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