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AJNR - American Journal of Neuroradiology

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Three-Dimensional, T1-Weighted Gradient-Echo Imaging of the Brain with a Volumetric Interpolated Examination

Stephan G. Wetzel^a, Glyn Johnson^a, Andrew G. S. Tan^a, Soonmee Cha^a, Edmond A. Knopp^a, Vivian S. Lee^a, David Thomasson^b and Neil M. Rofsky^c

^a Department of Radiology, New York University Medical Center, NY
^b Siemens Medical Systems, Washington, DC
^c Magnetic Resonance Imaging, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA

View larger version (17K): [in a new window]   FIG 1. SNR measurements obtained on a phantom for T1 values between 5 and 1000 ms for the 5-mm VIBE and MP RAGE reformations and the T1-weighted SE images.

View larger version (75K): [in a new window]   FIG 2. Images of the posterior fossa in a patient with suspected metastatic disease. A, Two-dimensional T1-weighted SE image shows marked pulsation artifacts. Superimposition of the choroidal plexus in the fourth ventricle and the artifacts mimic a possible contrast-enhancing lesion (arrow). B, MP RAGE 5-mm reformation shows considerable ghost artifacts (arrows) impairing visualization of the pons and the cerebellum. C, VIBE 5-mm reformation shows no artifact.

View larger version (78K): [in a new window]   FIG 3. Primary cerebral lymphoma. A–C, Interhemispheric contrast-enhancing lesion (arrow in A) is well visualized on both the 2D T1-weighted SE image (A) and the VIBE 5-mm reformation (B), but is less obvious on the MP RAGE 5-mm reformation (C).