منابع مشابه
Artifacts in Diffusion MRI
This chapter focuses on artifacts that are relevant for diffusion • imaging studies of the brain in a clinical research setting. For typical clinical studies, the most relevant sources of “physi • ological noise” artifacts are subject motion and cardiac pulsation, and the most common sources of “system-related artifacts” are eddy current distortions. Artifacts not only increase the variability...
متن کاملManaging Metallic Artifacts in MRI
Background Magnetism is a fundamental property of matter. As such, all substances have some type of magnetic property. Magnetic susceptibility refers to an object’s or substance’s ability to become magnetized. If two substances with different magnetic susceptibilities are close to one another, a small local magnetic field gradient is induced. The greater the difference in magnetic susceptibilit...
متن کاملMetal Artifacts in Computed Tomography
Karin Andersson (2018): Metal Artifacts in Computed Tomography – impact of reduction methods on image quality and radiotherapy treatment planning. Örebro Studies in Medicine 172. Degradation of image quality by metal artifacts is a common problem in computed tomography (CT) imaging, which can limit the diagnostic value of a CT examination and also introduce inaccuracies in radiotherapy (RT) tre...
متن کاملMRI Artifacts: Mechanism and Control
A wide variety of artifacts is routinely encountered on MR images. This article presents the cause, appearance, diagnostic effect, and available remedies for the artifacts that are most frequently observed on MR images and are of greatest clinical significance. Combined with routine preventive maintenance of imaging equipment, consistent quality control, and appropriate selection of imaging par...
متن کاملEye artifacts from mascara in MRI.
A B amount of mascara on a piece of tape placed on a phantom confirmed our suspicions (fig. 18). Also, a plastic container of mascara was found to be attracted into the magnet. The mascara artifact is not significant with routine cerebral imaging but does degrade orbital detail. We now ask all outpatients to remove their mascara before coming to the imaging center. In addition , we have mascara...
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ژورنال
عنوان ژورنال: American Journal of Roentgenology
سال: 2011
ISSN: 0361-803X,1546-3141
DOI: 10.2214/ajr.11.7364