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Combination of signals from array coils using image-based estimation of coil sensitivity profiles
M Bydder1, D J Larkman, J V Hajnal
1Robert Steiner MR Unit, MRC Clinical Sciences Centre, Imperial College School of Medicine, Hammersmith Hospital, London, UK.
Magnetic Resonance in Medicine
|March 1, 2002
Summary
This study introduces a new method for combining MRI coil images, improving signal quality and reducing artifacts. The technique offers near-optimal signal combination and enhanced image viewing, especially for complex coil arrays.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Medical Imaging
- Signal Processing
Background:
- Optimal combination of MRI array coil data is crucial for image quality.
- The square root of the sum of squares (SOS) method is a common alternative but can introduce bias and reduce signal-to-noise ratio (SNR).
Purpose of the Study:
- To develop an improved method for combining MRI coil signals that reduces bias and enhances SNR.
- To enable near-optimal combination of data from diverse coil arrays, including highly localized coils.
Main Methods:
- Replaced coil sensitivity weighting with an image-derived quantity for signal combination.
- Applied global intensity scaling using individual coil sensitivities or combinations thereof.
- Investigated phase correction for complete bias elimination.
Main Results:
- The new method significantly decreases signal bias compared to SOS.
- Improved SNR, particularly when coil noise levels are unequal.
- Reduced image artifacts and enabled better visualization of combined data from heterogeneous coil arrays.
Conclusions:
- The described method offers a near-optimal and less biased approach to combining MRI array coil data.
- This technique enhances image quality and viewing, especially for complex imaging scenarios involving multiple coil types.