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26 de feb. de 2024 · Motion artifact is a patient-based artifact that occurs with voluntary or involuntary patient movement during image acquisition. Misregistration artifacts, which appear as blurring, streaking, or shading, are caused by patient movement during a CT scan.
This review places a strong emphasis on explaining the physics behind the occurrence of such artefacts, with the aim of aiding artefact detection and mitigation in particular clinical situations. Keywords: motion correction, motion prevention, motion artefact, MRI, review. INTRODUCTION.
1 de abr. de 2024 · motion artifact due to patient movement resulting in a distorted image radiopaque objects on/external to the patient (e.g. jewelry (e.g. necklaces, piercings), clothing (e.g. buttons), hair (e.g. ponytail, hair braids etc.)
23 de feb. de 2015 · Motion artifacts caused by breathing, cardiac movement, CSF pulsation/blood flow create a ghost artifact which can be reduced by patient immobilization, or cardiac/respiratory gating. Aliasing artifacts can be eliminated by increasing the field of view.
A motion artifact is one of the most common artifacts in MR imaging. [2] Motion can cause either ghost images or diffuse image noise in the phase-encoding direction. The reason for mainly affecting data sampling in the phase-encoding direction is the significant difference in the time of acquisition in the frequency- and phase ...
22 de abr. de 2022 · Motion artifacts can be caused by periodic motion (eg, heartbeat or breathing) and random motion (eg, peristalsis or eye movement) during the scan. For periodic movements, artifacts can be reduced by using gated scan techniques (eg, cardiac gating or respiratory gating).
This article reviews the origins of motion artifacts and presents current mitigation and correction methods. In some imaging situations, the currently available motion correction tools are highly effective; in other cases, appropriate tools still need to be developed.
