Magnetic Resonance Imaging (MRI) Practice Test

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What is a remedy for a Gibbs truncation artifact?

An increase in the number of phase encodings
Decreasing TR
Decreasing the ETL
Reducing NEX

The correct answer is: An increase in the number of phase encodings

The remedy for Gibbs truncation artifact often involves increasing the number of phase encodings. This artifact appears at regions where there are sharp edges or transitions in the image, typically affecting the representation of structures that have high contrast. By increasing the number of phase encodings, the resolution in the phase-encoding direction is enhanced. This improvement allows for a better and more accurate representation of the signal, which helps to minimize the ringing artifacts associated with Gibbs phenomenon. More phase encodings lead to a finer grid in which the Fourier transform of the signal can be evaluated, resulting in a more resolved image with reduced truncation artifact effects. Other options involve adjustments to parameters like the repetition time (TR), echo train length (ETL), or number of excitations (NEX). While these parameters do affect image quality and acquisition time, they do not directly address the specific issue of Gibbs truncation artifact in the same manner as increasing the phase encodings does.