CAMRT-MRI In Practice chapter 8 Artifacts Exam Questions With 100% Accurate Answers Rated A+| newest Version 2024
CAMRT-MRI In Practice chapter 8 Artifacts Exam Questions With 100% Accurate Answers Rated A+| newest Version 2024 Phase mismapping: Appearance - ACCURATE ANSWER-AKA ghosting. produces replications of moving anatomy across the image in the phase direction. Usually occurs from anatomy that moves periodically (respirations, blood flow, swallowing, eye movement). Is phase mismapping/ghosting more or less apparent further from the source? - ACCURATE ANSWER-Less apparent. What is the calculation for separation between ghosts? - ACCURATE ANSWER-S(p)= scan time (TR, phase matrix, NEX) divided by the period of motion of the moving object. How to prevent phase mimsmapping - ACCURATE ANSWER-presat pulses placed over the area creating motion, or outside the FOV. Swapping the frequency and phase axis to move the artifact. Respiratory compensation techniques (3) - ACCURATE ANSWER-breath hold Respiratory compensation respiratory navigator echoes
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