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Magnetic resonance imaging system stability: Temporal variability in signal intensity, signal‐to‐noise, T 1 , and T 2 measurements on a 0.15‐T resistive system
Author(s) -
Slone Richard M.,
Fitzsimmons Jeffrey R.
Publication year - 1987
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596099
Subject(s) - reproducibility , imaging phantom , standard deviation , nuclear magnetic resonance , signal (programming language) , echo time , signal averaging , resistive touchscreen , magnetic resonance imaging , signal to noise ratio (imaging) , noise (video) , nuclear medicine , intensity (physics) , physics , optics , medicine , mathematics , radiology , analog signal , computer science , signal transfer function , statistics , artificial intelligence , image (mathematics) , computer vision , programming language , digital signal processing , computer hardware
Signal intensity (SI) variability was evaluated on a 0.15‐T resistive instrument using a phantom and was found to increase with time, repetition time ( T R ), and echo time ( T E ), ranging from 0.24% standard deviation (SD) over 34 min for 500/30 ( T R / T E ) images, to 2.1% SD over 5 days for 2000/30 images. Signal‐to‐noise (S/N) variability increased with time and T E but not T R and ranged from 4.2% SD over 34 min to 7.1% SD over 5 days in 500/30 images. Variability in T 1 and T 2 measurements on phantoms ranged from 1.8% to 4.8% SD for T 1 and 3.6% to 6.5% SD for T 2 in the biological range over 5 h. High reproducibility of SI, T 1 , and T 2 measurements was demonstrated over a 6‐week period in normal muscle measurements.
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