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Passive radiofrequency shimming in the thighs at 3 Tesla using high permittivity materials and body coil receive uniformity correction. | LitMetric

AI Article Synopsis

  • The study investigates how high permittivity dielectric pads affect both the transmission and reception properties of a 3 Tesla body coil focused on the thigh region and their impact on image consistency in MRI applications.
  • Experiments involved simulating and measuring transmit and receive profiles of the coil with and without dielectric pads, including the use of a method called SENSE for parallel imaging.
  • Results indicated that while dielectric pads enhance the transmission uniformity of the body coil, they can reduce reception uniformity, but this drawback can be corrected using a reception profile filter, leading to significantly improved image uniformity.

Article Abstract

Purpose: To explore the effects of high permittivity dielectric pads on the transmit and receive characteristics of a 3 Tesla body coil centered at the thighs, and their implications on image uniformity in receive array applications.

Theory And Methods: Transmit and receive profiles of the body coil with and without dielectric pads were simulated and measured in healthy volunteers. Parallel imaging was performed using sensitivity encoding (SENSE) with and without pads. An intensity correction filter was constructed from the measured receive profile of the body coil.

Results: Measured and simulated data show that the dielectric pads improve the transmit homogeneity of the body coil in the thighs, but decrease its receive homogeneity, which propagates into reconstruction algorithms in which the body coil is used as a reference. However, by correcting for the body coil reception profile this effect can be mitigated.

Conclusion: Combining high permittivity dielectric pads with an appropriate body coil receive sensitivity filter improves the image uniformity substantially compared with the situation without pads. Magn Reson Med 76:1951-1956, 2016. © 2015 International Society for Magnetic Resonance in Medicine.

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Source
http://dx.doi.org/10.1002/mrm.26070DOI Listing

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