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Magnetic susceptibility effects secondary to out-of-plane air in fast MR scanning
R M Schick1, G L Wismer, K R Davis
1Department of Radiology, Harvard Medical School, Massachusetts General Hospital, Boston 02114.
AJNR. American Journal of Neuroradiology
|May 1, 1988
Abstract:
Areas of signal loss in brain overlying air-containing structures at the skull base are commonly observed on axial fast MR images. The nature of this effect, which can mimic the appearance of cerebral hemorrhage, is investigated in a phantom study and in a normal volunteer. The magnitude of the signal loss is found to be inversely related to the distance of the scanning plane from the air-containing structure and directly related to the echo time.