Optimization of spatial resolution for peripheral magnetic resonance angiography.

Détails

ID Serval
serval:BIB_271D61BF0FE6
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Optimization of spatial resolution for peripheral magnetic resonance angiography.
Périodique
Academic Radiology
Auteur(s)
Tang A., Cloutier G., Therasse E., Beaudoin G., Qanadli S.D., Giroux M.F., Boussion N., de Guise J.A., Oliva V.L., Soulez G.
ISSN
1076-6332
Statut éditorial
Publié
Date de publication
2007
Peer-reviewed
Oui
Volume
14
Numéro
1
Pages
54-61
Langue
anglais
Résumé
RATIONALE AND OBJECTIVES: To determine optimum spatial resolution when imaging peripheral arteries with magnetic resonance angiography (MRA). MATERIALS AND METHODS: Eight vessel diameters ranging from 1.0 to 8.0 mm were simulated in a vascular phantom. A total of 40 three-dimensional flash MRA sequences were acquired with incremental variations of fields of view, matrix size, and slice thickness. The accurately known eight diameters were combined pairwise to generate 22 "exact" degrees of stenosis ranging from 42% to 87%. Then, the diameters were measured in the MRA images by three independent observers and with quantitative angiography (QA) software and used to compute the degrees of stenosis corresponding to the 22 "exact" ones. The accuracy and reproducibility of vessel diameter measurements and stenosis calculations were assessed for vessel size ranging from 6 to 8 mm (iliac artery), 4 to 5 mm (femoro-popliteal arteries), and 1 to 3 mm (infrapopliteal arteries). Maximum pixel dimension and slice thickness to obtain a mean error in stenosis evaluation of less than 10% were determined by linear regression analysis. RESULTS: Mean errors on stenosis quantification were 8.8% +/- 6.3% for 6- to 8-mm vessels, 15.5% +/- 8.2% for 4- to 5-mm vessels, and 18.9% +/- 7.5% for 1- to 3-mm vessels. Mean errors on stenosis calculation were 12.3% +/- 8.2% for observers and 11.4% +/- 15.1% for QA software (P = .0342). To evaluate stenosis with a mean error of less than 10%, maximum pixel surface, the pixel size in the phase direction, and the slice thickness should be less than 1.56 mm2, 1.34 mm, 1.70 mm, respectively (voxel size 2.65 mm3) for 6- to 8-mm vessels; 1.31 mm2, 1.10 mm, 1.34 mm (voxel size 1.76 mm3), for 4- to 5-mm vessels; and 1.17 mm2, 0.90 mm, 0.9 mm (voxel size 1.05 mm3) for 1- to 3-mm vessels. CONCLUSION: Higher spatial resolution than currently used should be selected for imaging peripheral vessels.
Mots-clé
Constriction, Pathologic, Magnetic Resonance Angiography/methods, Peripheral Vascular Diseases/diagnosis, Phantoms, Imaging, Software
Pubmed
Web of science
Création de la notice
11/04/2008 13:20
Dernière modification de la notice
20/08/2019 14:06
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