What type of artifact occurs due to a patient moving during an MRI scan?

• A. Phase wrap
• B. Motion artifact
• C. Vascular artifact
• D. Chemical shift artifact

Answer: (B)

Motion artifact occurs when a patient moves during an MRI scan, leading to blurring or ghosting of the images. This is because MRI relies on the precise timing and positioning of the magnetic field and radiofrequency pulse to produce clear images. Any unintentional movement by the patient can disrupt this process, resulting in artifacts that degrade the quality of the images.

Motion artifact is particularly significant in MRI because the imaging process can take several minutes, and even slight movements can have pronounced effects on image clarity. This type of artifact can mask important anatomical details and lead to diagnostic challenges.

The other types of artifacts listed, such as phase wrap, vascular artifact, and chemical shift artifact, are caused by different phenomena unrelated to patient movement. Understanding the nature of motion artifact helps MRI technologists take steps to minimize it, such as using shorter scan times or ensuring patient comfort and stillness during imaging.