Novel multi-channel transmission line coil for high field magnetic resonance imaging

Akgün, Can; DelaBarre, Lance; Sohn, Sung-Min; Snyder, Carl J.; Adriany, Gregor; Uğurbil, Kâmil; Vaughan, J. Thomas; Gopinath, A.

doi:10.1109/mwsym.2009.5165974

Cited by 7 publications

(3 citation statements)

References 7 publications

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“…The capacitor values optimized on bench-top measurements were in good agreement with those capacitor values initially optimized in CST-DS (pig body phantom as load) [see Table 3]. For some elements, there are discrepancies between the optimized capacitor values in CST-DS simulations and on bench-top measurements, which mainly arises at the feeding ports of the splitting tuning and matching capacitors (e.g., C m 14 , C a 14 and C b 14 for element 14). This is because the discrete implemented PS circuits were added to adjust the HW phases, and they were not modeled in the CST simulations since they were considered to be ideal 50 Ω circuits.…”

Section: Discussionsupporting

confidence: 67%

“…This is because of standing waves creating constructive and destructive interferences of the transmitted + B 1 field magnitude and hence strong intensity artifacts occurring in the acquired MR images [3][4][5][6] . For brain imaging at 7 T, different coil array designs and technologies have been introduced to solve the issues of + B 1 field inhomogeneity such as microstrip transmission line (MTL) resonators [7][8][9][10][11][12] , inverted (MTL) resonators 13 , stepped impedance resonators [14][15][16][17][18][19] , and by utilizing a high-impedance surface as the RF-shield to improve the efficiency and penetration of the + B 1 field 20,21 . Despite the numerous technical challenges related to B 0 and + B 1 field inhomogeneities, the application of UHF scanners for cardiovascular research holds significant promise 22,23 .…”

mentioning

confidence: 99%

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A Novel Mono-surface Antisymmetric 8Tx/16Rx Coil Array for Parallel Transmit Cardiac MRI in Pigs at 7T

Elabyad¹,

Terekhov²,

Lohr³

et al. 2020

Sci Rep

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A novel mono-surface antisymmetric 16-element transmit/receive (Tx/Rx) coil array was designed, simulated, constructed, and tested for cardiac magnetic resonance imaging (cMRI) in pigs at 7 T. The cardiac array comprised of a mono-surface 16-loops with two central elements arranged antisymmetrically and flanked by seven elements on either side. The array was configured for parallel transmit (pTx) mode to have an eight channel transmit and 16-channel receive (8Tx/16Rx) coil array. Electromagnetic (EM) simulations, bench-top measurements, phantom, and MRI experiments with two pig cadavers (68 and 46 kg) were performed. Finally, the coil was used in pilot in-vivo measurements with a 60 kg pig. Flip angle (FA), geometry factor (g-factor), signal-to-noise ratio (SNR) maps, and highresolution cardiac images were acquired with an in-plane resolution of 0.6 mm × 0.6 mm (in-vivo) and 0.3 mm × 0.3 mm (ex-vivo). The mean g-factor over the heart was 1.26 (R = 6). Static phase B 1 + shimming in a pig body phantom with the optimal phase vectors makes possible to improve the B 1 + homogeneity by factor > 2 and transmit efficiency by factor > 3 compared to zero phases (before RF shimming). Parallel imaging performed in the in-vivo measurements demonstrated well preserved diagnostic quality of the resulting images at acceleration factors up to R = 6. The described hardware design can be adapted for arrays optimized for animals and humans with a larger number of elements (32-64) while maintaining good decoupling for various MRI applications at UHF (e.g., cardiac, head, and spine).

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Section: Discussionsupporting

confidence: 67%

mentioning

confidence: 99%

A Novel Mono-surface Antisymmetric 8Tx/16Rx Coil Array for Parallel Transmit Cardiac MRI in Pigs at 7T

Elabyad¹,

Terekhov²,

Lohr³

et al. 2020

Sci Rep

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show abstract

“…In this work a multiconductor transmission line (MTL) model is developed and successfully applied to analyze a 12-element unloaded and loaded microstrip line transverse electromagnetic (TEM) resonator coil for animal studies [1]. To produce a uniform B 1 field along the coil (z-direction), a multi-section alternating impedance microstrip element was investigated in Akgun [2]. The widths of the microstrip line are varied to produce an alternating low-high impedance configuration.…”

Section: Introductionmentioning

confidence: 99%

Comparing Saddle, Slotted-tube and Parallel-plate Coils for Magnetic Resonance Imaging

Nespor

Bartušek

Dokoupil

2014

Measurement Science Review

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The paper is concerned with a comparison of the properties of RF coils of three configurations for MRI measurements on small animals. In comparison with the classical saddle coil the proposed modification of slotted-tube coil exhibits identical homogeneity of B 1 field in a larger space. The parallel-plate coil has a satisfactory homogeneity of B 1 field over the whole internal space. The signal-to-noise ratio measured for all three coils is roughly the same and is given by the magnitude of RF pre-amplifier noise. As the slotted-tube and parallel-plate coils have a lower inductance compared with the saddle coil, they can be tuned to resonance on the 200 MHz frequency even at larger dimensions. The results show that the parallel-plate coil has very good properties for the measurement of small animals.

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Improved field homogeneity for multi-channel stepped impedance microstrip transceiver arrays and travelling wave for MRI at 7T

Elabyad

Herrmann

Bruns

et al. 2016

2016 46th European Microwave Conference (EuMC)

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Novel multi-channel transmission line coil for high field magnetic resonance imaging

Cited by 7 publications

References 7 publications

A Novel Mono-surface Antisymmetric 8Tx/16Rx Coil Array for Parallel Transmit Cardiac MRI in Pigs at 7T

A Novel Mono-surface Antisymmetric 8Tx/16Rx Coil Array for Parallel Transmit Cardiac MRI in Pigs at 7T

Comparing Saddle, Slotted-tube and Parallel-plate Coils for Magnetic Resonance Imaging

Improved field homogeneity for multi-channel stepped impedance microstrip transceiver arrays and travelling wave for MRI at 7T

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