Abstract
Multimodality imaging,specifically PET-CT,brought a new perspective into the fields of clinical imaging.Clinical cases have shown that PET-CT has great value in clinical diagnosis and experimental reaserch.But PET-CT still bears some limitations.A major drawback is that CT provides only limited soft tissue contrast and exposes the patient to a significant radiation dose.MRI overcome these limitations,it has excellent soft tissue contrast,high temporal and spatial resolution and no radiation damage.Additionally,since MRI provides also functional information,PET-MRI will show a new direction of multimodality imaging in the future. Key words: Neoplasms; Magnetic resonance imaging; Positron- emission tomography; Tomography,X-ray computed; Imaging fusion
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