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Quantitation of structural distortion of the cervical neural foramina in gradient‐echo MR imaging
Author(s) -
Tien Robert D.,
Buxton Richard B.,
Schwaighofer Bernard W.,
Chu Pauline K.
Publication year - 1991
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880010611
Subject(s) - sagittal plane , distortion (music) , artifact (error) , magnetic resonance imaging , foramen , nuclear magnetic resonance , anatomy , nuclear medicine , materials science , medicine , biomedical engineering , physics , radiology , computer science , artificial intelligence , amplifier , optoelectronics , cmos
Quantitative errors (due to magnetic susceptibility artifacts) in the measurement of the cervical spinal neural foramina with fast gradient‐echo (GRE) magnetic resonance imaging were assessed. Cylindric phantoms of different materials were used to demonstrate the nature of magnetic susceptibility artifacts, emphasizing the dependence of the artifact on tissue geometry. Neural foramina diameters measured on thin, sagittal GRE and spin‐echo (SE) images through the neural foramina of a fresh human cervical spine specimen were then compared with direct measurements with calipers. The GRE images showed more apparent narrowing than did the SE images. The absolute distortion of seven neural foramina was rather constant (less than two pixels) on the GRE images; therefore, the relative distortion was inversely proportional to the size of the neural foramen, ranging up to 10% in the upper cervical region at a short TE. The absolute and relative distortion increased as TE increased. At a constant TE, the structural distortion did not change with different TRs or flip angles. The shortest possible TE is recommended in evaluation of the cervical spine.