What typically causes zipper artefact in MRI imaging?

Zipper artefact in MRI imaging is typically associated with insufficient radiofrequency (RF) shielding. This artefact manifests as bright or dark lines that appear across the imaging plane, often due to external RF interference. Such interference can arise from various sources, such as nearby electronic devices or inadequate shielding materials in the MRI room. When the RF environment is not properly controlled, signals from outside sources can inadvertently influence the imaging process, creating these artefacts that resemble the appearance of a zipper.

Proper RF shielding is critical in maintaining image quality in MRI scans. It ensures that only the intended RF signals from within the MRI system are captured, minimizing any potential distortions caused by external factors. This is why insufficient RF shielding is recognized as the primary cause of zipper artefact, highlighting the importance of maintaining a controlled environment in MRI facilities to produce accurate and quality images.