In this continuing project, our team aims to develop and deploy novel remote encircling many-element transmitter and detector array structures for high-performance high-field magnetic resonance imaging. Whereas conventional wisdom argues for close-fitting body-contoured coils, the new structures we plan to build will eliminate the many practical and fundamental disadvantages of close-fitting many-element arrays, while preserving all degrees of freedom, and enhancing imaging performance through the inclusion of novel RF field elements of unique benefit at high magnetic field strength. After constructing several prototypes for 3 Tesla and 7 Tesla operation, we will demonstrate potential benefits of this new """"""""contact-free"""""""" image acquisition technology, whether alone or in combination with targeted local coils, for visualization of disease processes such as pancreatic cancer and hip osteoarthritis, which have proven to be a challenge for traditional MRI approaches. This continuing work follows the successful first funding period of an R01 project which introduced a wide range of technological and methodological innovations to the field of rapid MRI.
This continuing project explores a new paradigm for magnetic resonance (MR) image acquisition, in which large arrays of remote encircling transmitters and detectors are used in place of traditional body coils or close- fitting coil arrays. The new encircling structures, suitable for incorporation within the covers of an MR scanner, will eliminate many of the practical and fundamental difficulties associated with close-fitting coils, while taking advantage of some of the unique features of high-field MR to improve imaging performance. After constructing several prototypes, we will demonstrate the value of this new contact-free image acquisition technology for visualization of common and high-impact disease processes such as pancreatic cancer and hip osteoarthritis, which have proven to be a challenge for traditional MRI approaches.
|Haemer, Gillian G; Vaidya, Manushka; Collins, Christopher M et al. (2017) Approaching ultimate intrinsic specific absorption rate in radiofrequency shimming using high-permittivity materials at 7 Tesla. Magn Reson Med :|
|Vaidya, Manushka V; Collins, Christopher M; Sodickson, Daniel K et al. (2016) Dependence of B1+ and B1- Field Patterns of Surface Coils on the Electrical Properties of the Sample and the MR Operating Frequency. Concepts Magn Reson Part B Magn Reson Eng 46:25-40|
|Feng, Li; Axel, Leon; Chandarana, Hersh et al. (2016) XD-GRASP: Golden-angle radial MRI with reconstruction of extra motion-state dimensions using compressed sensing. Magn Reson Med 75:775-88|
|Alon, Leeor; Deniz, Cem Murat; Carluccio, Giuseppe et al. (2016) Effects of Anatomical Differences on Electromagnetic Fields, SAR, and Temperature Change. Concepts Magn Reson Part B Magn Reson Eng 46:8-18|
|Brown, Ryan; Lakshmanan, Karthik; Madelin, Guillaume et al. (2016) A flexible nested sodium and proton coil array with wideband matching for knee cartilage MRI at 3T. Magn Reson Med 76:1325-34|
|Alon, Leeor; Sodickson, Daniel K; Deniz, Cem M (2016) Heat equation inversion framework for average SAR calculation from magnetic resonance thermal imaging. Bioelectromagnetics 37:493-503|
|Deniz, Cem M; Vaidya, Manushka V; Sodickson, Daniel K et al. (2016) Radiofrequency energy deposition and radiofrequency power requirements in parallel transmission with increasing distance from the coil to the sample. Magn Reson Med 75:423-32|
|Riley, Geoffrey M; McWalter, Emily J; Stevens, Kathryn J et al. (2015) MRI of the hip for the evaluation of femoroacetabular impingement; past, present, and future. J Magn Reson Imaging 41:558-72|
|Cao, Zhipeng; Park, Joshua; Cho, Zang-Hee et al. (2015) Numerical evaluation of image homogeneity, signal-to-noise ratio, and specific absorption rate for human brain imaging at 1.5, 3, 7, 10.5, and 14T in an 8-channel transmit/receive array. J Magn Reson Imaging 41:1432-9|
|Chang, Gregory; Deniz, Cem M; Honig, Stephen et al. (2014) MRI of the hip at 7T: feasibility of bone microarchitecture, high-resolution cartilage, and clinical imaging. J Magn Reson Imaging 39:1384-93|
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