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Titolo:
MR imaging of vascular stents: effects of susceptibility, flow, and radiofrequency eddy currents
Autore:
Bartels, LW; Smits, HFM; Bakker, CJG; Viergever, MA;
Indirizzi:
Univ Utrecht, AZU, Med Ctr, Dept Radiol,Image Sci Inst, NL-3584 CX Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3584 CX 3584 CX Utrecht, Netherlands
Titolo Testata:
JOURNAL OF VASCULAR AND INTERVENTIONAL RADIOLOGY
fascicolo: 3, volume: 12, anno: 2001,
pagine: 365 - 371
SICI:
1051-0443(200103)12:3<365:MIOVSE>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE ANGIOGRAPHY; SPIN-ECHO; ARTIFACTS; FERROMAGNETISM; DEVICES; GRAFTS;
Keywords:
eddy currents; flow, artifacts; MR, vascular studies; MR, artifacts; stents and prostheses;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Bartels, LW Univ Utrecht, AZU, Med Ctr, Dept Radiol,Image Sci Inst, Room E-01-334,Heidelberglaan 100, NL-3584 CX Utrecht, Netherlands Univ Utrecht Room E-01-334,Heidelberglaan 100 Utrecht Netherlands NL-3584 CX
Citazione:
L.W. Bartels et al., "MR imaging of vascular stents: effects of susceptibility, flow, and radiofrequency eddy currents", J VAS INT R, 12(3), 2001, pp. 365-371

Abstract

PURPOSE: The purpose of this in vitro study was to examine the various sources of artifacts in magnetic resonance (MR) imaging and angiography of vascular stents. MATERIALS AND METHODS: Five low-artifact stents-Wallstent (cobalt alloy), Memotherm (nitinol), Perflex (stainless steel), Passager (tantalum), and Smart (nitinol)-were imaged in a vascular flow phantom, consisting of a thin-walled cellulose vessel model connected to a pump system. The echo time andthe angulation of the stents with respect to the direction of the main magnetic field were varied. Spin echo and gradient echo images as well as three-dimensional MR angiograms were obtained to study the effects of flow magnetic susceptibility, and radiofrequency-induced eddy currents. RESULTS: Susceptibility artifacts were restricted to the stents' direct environment and were mildest at short echo times and with the stents aligned with the main magnetic field. Nitinol stents showed less artifacts than steel stents did. Radiofrequency artifacts obscuring the stent lumen and flow-related lumen displacement were seen in all stents. The extent to which these occurred depended on strut geometry and orientation. CONCLUSIONS: For low-artifact stents, the material the stent is made of isnot the only important factor in the process of artifact formation. Susceptibility artifacts, radiofrequency eddy currents and flow-related artifactsall contribute to the image distortion, and are dependent on the geometry and orientation of the struts and on the orientation of the stent in the main magnetic field.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 16:12:07