What is the definition of cross-talk artefact in MRI?

Cross-talk artefact in MRI refers to the interference of signals between adjacent slices during multi-slice imaging, primarily caused by imperfect radiofrequency (RF) pulses. This phenomenon occurs when the excitation pulses used to visualize one slice inadvertently affect the neighboring slices, leading to signal overlaps and distortions in the images produced.

In the context of MRI, particularly when using fast imaging techniques, multiple slices are often acquired in rapid succession. If the RF pulses are not perfectly tailored to the specific slice thickness and positioning, signals from adjacent slices can interfere, resulting in artefacts that may degrade image quality. This interference can manifest as areas of increased signal, changes in intensity, or blurring at the boundaries between slices, making it challenging to accurately interpret the images.

Understanding cross-talk artefact is crucial for MRI technicians and radiologists, as recognizing and mitigating this artefact can significantly enhance the clarity and diagnostic utility of the scans. The presence of cross-talk artefact can be minimized through careful adjustment of parameters such as slice thickness, RF pulse timing, and acquisition techniques, allowing for clearer separation of the slices and an accurate reflection of the anatomy being studied.