Abstract：
OBJECT:Virtual Phantom Magnetic Resonance Imaging (ViP MRI) is a method to generate reference signals on MR images, using external radiofrequency (RF) signals. The aim of this study was to assess the feasibility of ViP MRI to generate complex-data images of phantoms mimicking water-fat systems. MATERIALS AND METHODS:Various numerical phantoms with a given fat fraction, T2* and field map were designed. The k-space of numerical phantoms was converted into RF signals to generate virtual phantoms. MRI experiments were performed at 4.7T using a multi-gradient-echo sequence on virtual and physical phantoms. The data acquisition of virtual and physical phantoms was simultaneous. Decomposition of the water and fat signals was performed using a complex-based water-fat separation algorithm. RESULTS:Overall, a good agreement was observed between the fat fraction, T2* and phase map values of the virtual and numerical phantoms. In particular, fat fractions of 10.5±0.1 (vs 10% of the numerical phantom), 20.3±0.1 (vs 20%) and 30.4±0.1 (vs 30%) were obtained in virtual phantoms. CONCLUSION:The ViP MRI method allows for generating imaging phantoms that i) mimic water-fat systems and ii) can be analyzed with water-fat separation algorithms based on complex data.
journal_name
Magn Reson Imagingjournal_title
Magnetic resonance imagingauthors
Salvati R,Hitti E,Bellanger JJ,Saint-Jalmes H,Gambarota Gdoi
10.1016/j.mri.2015.12.002subject
Has Abstractpub_date
2016-06-01 00:00:00pages
617-23issue
5eissn
0730-725Xissn
1873-5894pii
S0730-725X(15)00297-0journal_volume
34pub_type
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