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Over-overlapped loop arrays: A numerical study.

Ming Lu1, John C Gore2, Xinqiang Yan3

  • 1Vanderbilt University Institute of Imaging Science, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Radiology and Radiological Sciences, Vanderbilt University Medical Center, Nashville, TN, USA; College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai, Shandong, China.

Magnetic Resonance Imaging
|July 21, 2020
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Summary
This summary is machine-generated.

Overlapping more in Magnetic Resonance Imaging (MRI) coil arrays can significantly boost signal-to-noise ratio (SNR), especially when coil noise is the dominant factor in deeper imaging regions.

Keywords:
ArrayLoopOver-overlapParallel imagingRF coilSNR

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Area of Science:

  • Medical Imaging
  • Electrical Engineering
  • Physics

Background:

  • Coil arrays are crucial for Magnetic Resonance Imaging (MRI) reception and parallel transmission, particularly at high fields.
  • Conventional designs overlap coil elements by ~10% to minimize inductive coupling, but this limits coil size and reduces signal-to-noise ratio (SNR) in deeper regions due to increased coil noise.

Purpose of the Study:

  • To investigate novel MRI coil array designs with increased element overlap.
  • To compare the performance of over-overlapped arrays against conventionally overlapped arrays in terms of SNR.

Main Methods:

  • Numerical calculations were employed to simulate and analyze coil array performance.
  • Simulations compared over-overlapped arrays with two types of conventionally overlapped arrays: same coil size/fewer coils and same number of coils/smaller size.

Main Results:

  • Over-overlapped coil arrays demonstrated a considerable increase in central SNR.
  • This improvement was most significant in scenarios where coil noise dominated the total noise.

Conclusions:

  • Increased element overlap in MRI coil arrays offers a viable strategy to enhance SNR.
  • Over-overlapped designs are particularly beneficial for improving image quality in deeper sample volumes where coil noise is prevalent.