Improved resolution and signal-to-noise ratio in MRI via enhanced signal digitization.

Autor: Elliott MA; Department of Radiology, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6100, USA., Insko EK, Greenman RL, Leigh JS
Jazyk: angličtina
Zdroj: Journal of magnetic resonance (San Diego, Calif. : 1997) [J Magn Reson] 1998 Feb; Vol. 130 (2), pp. 300-4.
DOI: 10.1006/jmre.1997.1319
Abstrakt: The high frequency k-space data in magnetic resonance imaging is often poorly reproduced due to the finite dynamic range of an analog-to-digital converter. The magnitude of this digitization error can equal and even exceed the magnitude of the thermal noise. Under such conditions, attempts to increase image signal-to-noise ratio via signal averaging meet with diminishing success. Because the relative size of the digitization error increases at higher spatial frequencies, a reduction in image resolution is incurred as well. By adjusting the level of the analog signal sampled by the analog-to-digital converter during the course of an imaging experiment, the magnitude of the digitization artifact can be greatly reduced. The results of simulations and imaging experiments are presented which demonstrate that this strategy improves both the signal-to-noise ratio and resolution of magnetic resonance images.
(Copyright 1998 Academic Press.)
Databáze: MEDLINE
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