Open access birdcage coils for microscopic imaging of plants at 11.7T

Hudson, Alex M. J.; Köckenberger, Walter; Bowtell, Richard

doi:10.1007/bf02601840

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…To provide a larger opening in front of patients' faces, various half‐volume RF coils are available, such as half‐birdcage coils, 9 U‐shaped birdcage coils, 10 and quadrature half‐volume transverse electromagnetic coils 11 . However, the transmit RF magnetic field (

B_{1}^{+}

) coverage for the aforementioned coils is only half that of a conventional birdcage coil.…”

Section: Introductionmentioning

confidence: 99%

“…7 Finally, this spacing would be useful for MRI-guided surgery (eg, laser interstitial thermal therapy), which uses a laser device for selective ablation of a lesion or a tissue. 8 To provide a larger opening in front of patients' faces, various half-volume RF coils are available, such as half-birdcage coils, 9 U-shaped birdcage coils, 10 and quadrature half-volume transverse electromagnetic coils. 11 However, the transmit RF magnetic field (B + 1 ) coverage for the aforementioned coils is only half that of a conventional birdcage coil.…”

Section: Introductionmentioning

confidence: 99%

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Open birdcage coil for head imaging at 7T

Nikulin

Vignaud

Avdievich

et al. 2021

Magnetic Resonance in Med

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Purpose To theoretically describe, design, and test the new geometry of the birdcage coil for 7 Tesla anatomical brain imaging, which includes a large window on top, without deliberately jeopardizing its homogeneity and efficiency. This opencage will not only improve patient comfort but also enable the volunteer to follow functional MRI stimuli. This design could also facilitate the tracking of patient compliance and enable better correction of the movement. Methods Via the transfer matrix approach, a birdcage‐like coil with a nonperiodic distribution of rungs is constructed with optimized currents in the coil rungs. Subsequently, the coil is adjusted in full‐wave simulations. Then, the coil is assembled, fine‐tuned, and matched on the bench. Finally, these results are confirmed experimentally on a phantom and in vivo. Results Indeed, the computed isolation of −14.9 dB between the feeding ports of the coil and the symmetry of the circular polarized mode pattern transmit RF magnetic field (B1+) showed that the coil was properly optimized. An experimental assessment of the developed coil showed competitive transmit efficiency and coverage compared with the conventional birdcage coil of similar size. Conclusion The proposed opencage coil can be designed and work without a dramatic drop of performance in terms of the B1+ field homogeneity, transmit efficiency (〉〈B1+/Pitalicref), peak local specific absorption rate (SAR10g) and SAR efficiency (〉〈B1+/SAR10g).

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B_{1}^{+}

) coverage for the aforementioned coils is only half that of a conventional birdcage coil.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Open birdcage coil for head imaging at 7T

Nikulin

Vignaud

Avdievich

et al. 2021

Magnetic Resonance in Med

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Opencage radio frequency coil for magnetic resonance imaging

Nikulin

Rosny

Haliot

et al. 2019

Applied Physics Letters

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5T magnetic resonance imaging: radio frequency hardware and initial brain imaging

Wei¹,

Chen²,

Han³

et al. 2023

Quant Imaging Med Surg

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Background: We aimed to demonstrate the feasibility of generating high-resolution human brain magnetic resonance imaging (MRI) at 5 Tesla (T) using a quadrature birdcage transmit/48-channel receiver coil assembly.Methods: A quadrature birdcage transmit/48-channel receiver coil assembly was designed for human brain imaging at 5T. The radio frequency (RF) coil assembly was validated by electromagnetic (EM) simulations and phantom imaging experimental studies. The simulated B1+ field inside a human head phantom and inside a human head model generated by the birdcage coils driven in circularly polarized (CP) mode at 3T, 5T and 7T was compared. Signal-to-noise ratio (SNR) maps, the inverse g-factor maps for evaluation of parallel imaging performance, anatomic images, angiography images, vessel wall images and susceptibility weighted images (SWI) were acquired using the RF coil assembly at 5T and compared to those acquired using a 32-channel head coil on a 3T MRI scanner.Results: For the EM simulations, 5T MRI provided less RF inhomogeneity compared to that of 7T. In the phantom imaging study, the distributions of the measured B1+ field were consistent with the distributions of the simulated B1+ field. In the human brain imaging study, the average SNR value of the brain in the transversal plane at 5T was 1.6 times of that at 3T. The 48-channel head coil at 5T had higher parallel acceleration capability than the 32-channel head coil at 3T. The anatomic images at 5T also showed higher SNR than those at 3T. Improved delineation of the hippocampus, lenticulostriate arteries, and basilar arteries was observed at 5T compared to 3T. SWI with a higher resolution of 0.3 mm × 0.3 mm × 1.2 mm could be acquired at 5T, which enabled better visualization of small blood vessels compared to that at 3T. Conclusions: 5T MRI can provide significant SNR improvement compared to that of 3T with less RF inhomogeneity than that of 7T. The ability to obtain high quality in vivo human brain images at 5T using the quadrature birdcage transmit/48-channel receiver coil assembly has significant in clinical and scientific research applications.

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Open access birdcage coils for microscopic imaging of plants at 11.7T

Cited by 3 publications

References 4 publications

Open birdcage coil for head imaging at 7T

Open birdcage coil for head imaging at 7T

Opencage radio frequency coil for magnetic resonance imaging

5T magnetic resonance imaging: radio frequency hardware and initial brain imaging

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