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Titolo:
Biopsy needle tip artifact in MR-guided neurosurgery
Autore:
Liu, HY; Hall, WA; Martin, AJ; Truwit, CL;
Indirizzi:
Univ Minnesota, Dept Radiol, Ctr MR Guided Therapy, Sch Med, Minneapolis, MN 55455 USA Univ Minnesota Minneapolis MN USA 55455 ch Med, Minneapolis, MN 55455 USA
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE IMAGING
fascicolo: 1, volume: 13, anno: 2001,
pagine: 16 - 22
SICI:
1053-1807(200101)13:1<16:BNTAIM>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMAGING SYSTEM; SUSCEPTIBILITY;
Keywords:
interventional MRI; biopsy needles; magnetic susceptibility artifact; geometric image distortion; numerical simulation; finite difference method; device visualization; MR compatibility;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Liu, HY Univ Minnesota, Dept Radiol, Ctr MR Guided Therapy, Sch Med, Box 292,420 Delaware St,SE, Minneapolis, MN 55455 USA Univ Minnesota Box 292,420Delaware St,SE Minneapolis MN USA 55455
Citazione:
H.Y. Liu et al., "Biopsy needle tip artifact in MR-guided neurosurgery", J MAGN R I, 13(1), 2001, pp. 16-22

Abstract

A thorough understanding of both the appearance and origin of metallic biopsy needle tip artifact in magnetic resonance imaging (MRI) as well as its interaction with various magnetic resonance (MR) sequence parameters is beneficial for its application in today's MR-guided therapeutic procedures. Ina more practical setting, this investigation has focused on the characteristics of MR image artifacts associated with a finite-length metallic needle, specifically at the tip of a biopsy needle when it is approximately parallel to the main magnetic field. The image artifact at needle tip, which exhibits as a blooming ball-shaped signal void, was demonstrated and studied using MR imaging and numerical simulation employing the finite difference method (FDM). In order to understand the origin of this image artifact, a numerical model or simulation software based on the FDM has been developed specifically to solve for the field disturbance to a uniform magnetic field due to a finite-length metallic needle. The solution for magnetic field showsthat the field disturbance Is spatially localized at the needle tip. From the numerical results, simulated images were generated which were in a verysatisfactory agreement MR imaging experiment. Results showed that the MR image artifacts associated with MR-compatible metallic biopsy needles are not only present due to the magnetic susceptibility difference between the needle and its surrounding tissue, but also predictable in routine MR-guided procedures, and the size of the image artifacts could be reduced if optimalimaging parameters were used. (C) 2001 Wiley-Liss, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/01/20 alle ore 10:28:23