How can motion artifacts be identified in images?

• A. Presence of noise
• B. Blurring and ghosting in the phase encoding direction
• C. Increased contrast
• D. Decreased signal intensity

Answer: (B)

Motion artifacts in MRI images can be identified by the presence of blurring and ghosting, particularly in the phase encoding direction. This occurs because motion during the MRI scan can disrupt the proper timing of data acquisition, resulting in areas of the image that are smeared or duplicated.

When the patient moves, it causes the position of the tissues to change during the scan, leading to distortions that appear as blurred edges and repetitive patterns in the images. This is especially noticeable along the phase encoding direction of the image, as it's this axis that is most sensitive to motion during the data collection process.

Recognizing these artifacts is essential for imaging technologists, as they can help in evaluating the quality of the MRI scan and determine if additional imaging is necessary to obtain clearer results. Understanding these characteristics is vital for maintaining high-quality imaging standards and ensuring accurate diagnoses.