Abstract #4324
Intrinsic Diffusion Sensitivity of the bSSFP Signal: Influence of Strong Phase Encoding Gradients on Image SNR
Sbastien Br 1 , Matthias Weigel 1,2 , Jrgen Hennig 1 , Dominik Von Elverfeldt 1 , and Jochen Leupold 1
1
Department of Radiology, Medical Physics,
University Hospital Freiburg, Freiburg, Germany,
2
Radiological
Physics, University of Basel Hospital, Basel,
Switzerland
Sub-millimeter image resolution, necessary in fields
like molecular imaging, requires high gradient
amplitudes of several hundred mT/m, mostly available at
ultra-high field small animal scanner. The associated
high b-values induce strong diffusion effects. Diffusion
effects specific to the phase encoding gradients leading
to modulation of the steady state signal were observed
for a bSSFP sequence. In this work, we could observe an
important loss of SNR in the images by comparing the
theoretical expectation with the measurements.
Simulations confirmed that this loss of SNR is
associated to the diffusion effects of the PE gradients.
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