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Abstract #0083

TrueCISS: Genuine bSSFP Signal Reconstruction from Undersampled Multiple-Acquisition SSFP Using Model-Based Iterative Non-Linear Inversion

Tom Hilbert 1,2 , Damien Nguyen 3 , Tobias Kober 1,2 , Jean-Philippe Thiran 2 , Gunnar Krueger 1,2 , and Oliver Bieri 3

1 Siemens ACIT CHUV Radiology, Siemens Healthcare IM BM PI & Department of Radiology CHUV, Lausanne, Switzerland, 2 LTS5, cole Polytechnique Fdrale de Lausanne, Lausanne, Switzerland, 3 Radiological Physics, Department of Radiology, University of Basel, Basel, Switzerland

Balanced steady-state free-precession (bSSFP) is prone to local field inhomogeneities, typically appearing as signal voids, i.e. banding-artifacts. A new method, termed true constructive interference in steady state (trueCISS), is proposed based on the acquisition of eight highly undersampled bSSFP k-spaces with different radio-frequency (RF) phase increments. A model-based non-linear inversion is used to fit the bSSFP signal model onto the undersampled data, effectively estimating parameter maps that allow synthesizing the genuine bSSFP signal over the whole image, thus without any noticeable banding artifacts.

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