A body-sized phantom for evaluation of diffusion-weighted MRI data using conventional, readout-segmented, and zoomed echo-planar sequences
作者： Toni Ihalainen , Linda Kuusela , Maiju Soikkeli , Eila Lantto , Ali Ovissi
关键词: Diffusion MRI 、 Shim (magnetism) 、 Parallel imaging 、 Intensity normalization 、 Effective diffusion coefficient 、 Echo planar 、 Nuclear medicine 、 Medicine 、 Echo-planar imaging 、 Imaging phantom
摘要: BackgroundAbdominal diffusion-weighted imaging (DWI) has been rapidly increasing during the last few years. For evaluation of new DWI techniques, development suitable phantoms and quality assurance methods is important.PurposeTo construct a body-diameter phantom for abdominal study impact different acquisition options on image quality.Material MethodsA with diameter 31 cm volume 26 L was constructed, containing four samples representing clinically relevant range apparent diffusion coefficient (ADC) values. Measurements were carried out 1.5T 3.0T MRI systems using conventional echo-planar (EPI), readout-segmented EPI, zoomed EPI (3.0T) sequences. The effects parallel imaging, coil intensity normalization, patient-specific B1 shim also examined. ADC values signal-to-noise ratios measured, level artifacts visually evaluated.ResultsThe agreement between ...
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