What artefacts result from sampling-related issues in MRI?

Phase wrap and Gibbs artefacts are indeed related to sampling-related issues in MRI. Phase wrap, often referred to as aliasing, occurs when the spatial frequency of the signal exceeds the Nyquist limit, leading to incorrect image representation and an overlapping of the images from adjacent areas. This is a direct consequence of insufficient sampling of the data, which is crucial for accurately reconstructing the image.

Gibbs artefact, on the other hand, arises from the truncation of the k-space data, typically caused by undersampling of the high-frequency components. This phenomenon appears as ringing or oscillations near sharp edges and can significantly affect image quality and diagnostic accuracy.

Both artefacts stem from fundamental principles of how data is sampled and processed in MRI. Correct understanding of these concepts is essential for MRI technologists and radiologists to mitigate artefacts during imaging, ensuring high-quality diagnostic images.