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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. Blurring also occurs with patient movement during radiographic examinations.
If patient movement is voluntary, patients may require immobilization or sedation to prevent this.
Involuntary motion, such as respiration or cardiac motion, may cause artifacts that mimic pathology in surrounding structures.
This artifact can be reduced by using a fast scanning technique. Techniques, such as cardiac gating, may be used for examinations that concern the mediastinum.