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MRI IN PRACTICE CHAPTER 8: ARTIFACTS EXAM 2025 QUESTIONS AND ANSWERS Phase mismapping or ___ artifact produces replications of moving anatomy across the image in the ___. - ....ANSWER ...-Ghosting, phase encoding axis Phase mismapping usually originates from anatomy that moves periodically throughout the scan, such as ___. - ....ANSWER ...-The anterior abdominal wall during respiration, pulsation of vessels, and CSF The physical separation between each ghost artifact depends on the ___ parameters and the ___. - ....ANSWER ...-Scan time, period of motion Phase mismapping is produced by anatomy moving along the ___ during the pulse sequence. Unlike the ___ and ___ gradients, which are applied at the same amplitude every TR, the phase-encoding gradient is applied at different amplitudes. ....ANSWER ...-Phase-encoding gradient, frequency encoding, slice-select As anatomy moves during the scan, its reconstructed signal is misplaced in the phase encoding direction as the ___ changes. For example, the anterior abdominal wall moving during the scan results in signal acquiring different ___ values depending on its position along the gradient. - ....ANSWER ...-Gradient amplitude, phase ...©️ 2025, ALL RIGHTS RESERVED 1