Surface coil with reduced specific absorption rate for rat MRI at 7 T

Solis-Najera, S. E.; Martin, R.; Vázquez, F.; Rodrı́guez, A. O.

doi:10.1007/s10334-015-0501-8

Cited by 8 publications

(2 citation statements)

References 50 publications

(47 reference statements)

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“…The structural MRI scanning procedure of each rat lasted about forty minutes. The signal to noise ratio (SNR) is an important quality control index for structural MRI studies and there exist many ways for the calculation of SNR, such as those reported by Solis-Najera et al (2015), Pohmann et al (2016). In the present study, we selected a simple but effective approach for the calculation of SNR, which is defined as the ratio of the mean image intensity in the brain divided by the standard deviation of the intensity at background (Sumiyoshi et al, 2014).…”

Section: Methodsmentioning

confidence: 99%

Within-subject test-retest reliability of the atlas-based cortical volume measurement in the rat brain: A voxel-based morphometry study

Jing

Liu

et al. 2018

Journal of Neuroscience Methods

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Section: Methodsmentioning

confidence: 99%

Within-subject test-retest reliability of the atlas-based cortical volume measurement in the rat brain: A voxel-based morphometry study

Jing

Liu

et al. 2018

Journal of Neuroscience Methods

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“…The electromagnetic characteristics and the spatial distribution of the magnetic field 1 produced by our coil were numerically investigated using the finite integral technique (FIT) [16]. The FIT approach has been used for electromagnetic characterization of low and high field MRI RF coils loaded with human-mimicking phantoms with great results [17].…”

Section: Electromagnetic Field Simulationsmentioning

confidence: 99%

Numerical Analysis of a Flexible Dual Loop Coil and its Experimental Validation for pre-Clinical Magnetic Resonance Imaging of Rodents at 7 T

Solis-Najera

Vázquez

Hernández

et al. 2016

Measurement Science Review

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A surface radio frequency coil was developed for small animal image acquisition in a pre-clinical magnetic resonance imaging system at 7 T. A flexible coil composed of two circular loops was developed to closely cover the object to be imaged. Electromagnetic numerical simulations were performed to evaluate its performance before the coil construction. An analytical expression of the mutual inductance for the two circular loops as a function of the separation between them was derived and used to validate the simulations. The RF coil is composed of two circular loops with a 5 cm external diameter and was tuned to 300 MHz and 50 Ohms matched. The angle between the loops was varied and the Q factor was obtained from the 11 simulations for each angle. B1 homogeneity was also evaluated using the electromagnetic simulations. The coil prototype was designed and built considering the numerical simulation results. To show the feasibility of the coil and its performance, saline-solution phantom images were acquired. A correlation of the simulations and imaging experimental results was conducted showing a concordance of 0.88 for the B1 field. The best coil performance was obtained at the 90° aperture angle. A more realistic phantom was also built using a formaldehyde-fixed rat phantom for ex vivo imaging experiments. All images showed a good image quality revealing clearly defined anatomical details of an ex vivo rat.

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Stop band blocking window modeling with energy absorber in 5G mid‐band cellular communications

Ali

Yan

Ahmed

et al. 2021

Int J RF Mic Comp-Aid Eng

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A polarization dependent negative permittivity controlled energy absorber is proposed. The preparatory study includes a unique design of 5G cell phone radiating patch antenna (RPA) centring at Sub‐6 Mid‐band frequency range from 3.3 to 3.8 GHz. The proposed configuration exhibits the energy absorptance efficiency of the absorber when attached with 5G cell phone RPA, where absorber will protect the human brain from exposure of radio frequency fields in mobile phone applications. In proposed setup, we vary the geometrical parameters as well as the electrical value of lumped inductor element of the energy absorber and obtained stop band blocking window with comparative study to restrict the specific absorption rate and power/energy flow radiating from RPA toward the simulated human's brain. Moreover, the absorber does not significantly creates mismatch losses, nor effects the voltage standing wave ratio of RPA and hence a promising application to avoid the health hazards as well as for the safety compliance of 5G technology.

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Surface coil with reduced specific absorption rate for rat MRI at 7 T

Abstract: The slotted surface coil offers improved performance and low SAR100 mg for rat brain imaging at 7 T. This approach may be used with new RF coils to investigate SAR in humans.

Cited by 8 publications

References 50 publications

Within-subject test-retest reliability of the atlas-based cortical volume measurement in the rat brain: A voxel-based morphometry study

Within-subject test-retest reliability of the atlas-based cortical volume measurement in the rat brain: A voxel-based morphometry study

Numerical Analysis of a Flexible Dual Loop Coil and its Experimental Validation for pre-Clinical Magnetic Resonance Imaging of Rodents at 7 T

Stop band blocking window modeling with energy absorber in 5G mid‐band cellular communications

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