2D T2WI obtained in multi plane is recommend in preoperative assessment of rectal cancer, but 2D acquisition suffers from heavy partial volume effects. As a result, 2D T2WI cannot assess early rectal cancer stages accurately. Comparing with 2D T2WI, 3D T2WI could provide higher spatial resolution, especially the thin slice thickness, with highly reduced partial volume effects in rectal MRI. The purpose of the study was to compare the local-regional staging accuracy of the conventional 2D T2WI protocol and the 3D T2WI protocol for preoperative MR imaging in early rectal cancer patients.
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