Magnetic susceptibility effects secondary to out-of-plane air in fast MR scanning.
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.
D001921:Brain / Q000473:pathology; D001932:Brain Neoplasms / Q000473:pathology*; D002543:Cerebral Hemorrhage / Q000473:pathology*; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008953:Models, Anatomic