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The effects of coupled B1 fields in B1 encoded TRASE MRI - A simulation study
Pallavi Bohidar1, Hongwei Sun2, Jonathan C Sharp2
1Space MRI Lab, Division of Biomedical Engineering, University of Saskatchewan, Saskatoon, Canada.
Transmit Array Spatial Encoding (TRASE) MRI requires isolated RF coils. This study found that minimal B1 field coupling (below k=0.01) is ideal for TRASE, with acceptable performance up to k=0.1.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Radiofrequency (RF) Engineering
Background:
- Transmit Array Spatial Encoding (TRASE) is a novel MRI technique.
- TRASE utilizes phase gradients in transmit RF (B1) fields for spatial encoding.
- RF coil interactions can generate unwanted B1 fields, disrupting TRASE's spatial encoding.
Purpose of the Study:
- Investigate the impact of B1 field coupling on TRASE imaging.
- Determine acceptable levels of B1 field interactions for 2D TRASE.
- Provide crucial data for designing TRASE transmit array systems.
Main Methods:
- Bloch equation-based simulations were employed.
- The study focused on a 3-coil setup for 2D TRASE.
- Analysis involved assessing performance based on coupling constants (k) and S12 measurements.
Main Results:
- Ideal 2D TRASE performance was observed for coupling constants below k=0.01.
- Acceptable performance was maintained up to k=0.1.
- This corresponds to required S12 measurements between -50 dB and -30 dB.
Conclusions:
- B1 field isolation is critical for effective TRASE MRI.
- The study quantifies acceptable B1 field coupling levels for practical TRASE systems.
- Findings guide the development of robust TRASE transmit arrays.
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