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mri mra magnetic resonance mr perfusion magnetic resonance spectrocopy mr spectroscopy nmr mrs mri artifacts artifacts mri image quality echocardiography cardiac imaging mri cardiac mr cardiac imaging cardiac mri magnetic resonance cardiac imaging mrcp cholangiopancreatography perfusion weighted imaging pwi asl mr arterial spin labeling mrp mr perfusion diagnosis dwi diagnosis mr diffusion dwi differential diagnosis dw imaging diffusion weighted imaging t2 shine through mri dw sequences dwi cerebral vascular fid mra types human cell radiobiology cell cytoplasm mitochondria endoplasmic reticulum lysosomes nucleus nucleolus cell division mitosis meiosis interphase g1 s g2 angiography magnetic resonance cholangiopancreatography pancreas biliary system liver phase contrast magnetic resonance angiography ecg-gated magnetic resonance angiography pc-mra ecg-gated mra magnetic resonance angiography types non-contrast mra non-cemra ssfp mra ssfp technique steady state steady state free precession free induction decay go