Regensburg 2019 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 4: Poster session

ST 4.3: Poster

Dienstag, 2. April 2019, 14:00–16:00, Poster B1

Phase-sensitive water fat separation in frequency-modulated bSSFP cardiac CINE — •Anne Slawig, Tobias Wech, Thorsten Bley, and Herbert Köstler — Institut für diagnostische und interventionelle Radiologie, Universitätsklinikum Würzburg, Deutschland

Balanced steady state free precession (bSSFP) is widely used for assessing cardiac function in MRI, as it provides fast imaging with high SNR and excellent contrast. The main drawbacks include banding artefacts caused by field inhomogeneity and the hyperintense fat signal. The former have been shown to be eliminated by using a frequency-modulated bSSFP acquisition (1). Further on, fat and water signal can be separated in standard bSSFP imaging by a phase sensitive approach (2). Here we present a combination of both methods, which allows the reconstruction of banding free, water-only and fat-only images of the whole cardiac cycle (CINE imaging). Cardiac images of a healthy volunteer were acquired for 20 cardiac phases using an ECG log and the phase-sensitive separation was applied. In standard bSSFP measurements severe off-resonance artefacts were observed, ultimately resulting in major swaps between water and fat. The combination of the frequency-modulated measurement with the phase-sensitive separation approach showed no off-resonance artefacts and a good separation of water and fat throughout all frames of the cardiac cycle.

[1] Benkert T et al., Magn. Reson. Med. 2015;73:182-194

[2] Hargreaves BA et al., Magn. Reson. Med. 2003;50:210-213