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Titolo:
Diffusion-weighted imaging of the spine using radial k-space trajectories
Autore:
Dietrich, O; Herlihy, A; Dannels, WR; Fiebach, J; Heiland, S; Hajnal, JV; Sartor, K;
Indirizzi:
Univ Heidelberg, Sch Med, Dept Neuroradiol, D-69120 Heidelberg, Germany Univ Heidelberg Heidelberg Germany D-69120 , D-69120 Heidelberg, Germany Univ London Imperial Coll Sci Technol & Med, Hammersmith Hosp, Robert Steiner MRI Unit, London, England Univ London Imperial Coll Sci Technol & Med London England don, England Marconi Med Syst, MR Div, Cleveland, OH USA Marconi Med Syst Cleveland OHUSA ni Med Syst, MR Div, Cleveland, OH USA
Titolo Testata:
MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE
fascicolo: 1, volume: 12, anno: 2001,
pagine: 23 - 31
SICI:
0968-5243(200103)12:1<23:DIOTSU>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORD IN-VIVO; MULTIPLE-SCLEROSIS; MOTION ARTIFACTS; HUMAN BRAIN; CEREBRAL-ISCHEMIA; NAVIGATOR ECHOES; WHITE-MATTER; MRI; STROKE; RECONSTRUCTION;
Keywords:
diffusion-weighted MRI; human spine; radial k-space trajectory;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Dietrich, O Univ Heidelberg, Sch Med, Dept Neuroradiol, Neuenheimer Feld 400, D-69120 Heidelberg, Germany Univ Heidelberg Neuenheimer Feld 400 Heidelberg Germany D-69120
Citazione:
O. Dietrich et al., "Diffusion-weighted imaging of the spine using radial k-space trajectories", MAGN RES MA, 12(1), 2001, pp. 23-31

Abstract

Introduction: Diffusion-weighted MR imaging (DWI) of the spine requires robust imaging methods, that are insensitive to susceptibility effects causedby the transition from bone to soft tissue and motion artifacts due to breathing, swallowing, and cardiac motion. The purpose of this study was to develop a robust imaging method suitable for DWI of the spine. Methods and subjects: A radial k-space spin echo sequence has been implemented, which is self-navigating because each acquisition line passes throughthe origin of k-space. Influence of cardiac motion and associated flow of cerebrospinal fluid is minimized by cardiac gating with a finger photoplethysmograph. The sequence has been tested on a 1.5T system. Diffusion-weighted images of six normal volunteers were acquired in the sagittal plane with 4 b values between 50 and 500 s mm(-2). Because of the symmetries of the cord, diffusion measurements in the head-foot (HF) or left-right (LR) directions were sufficient to measure the dominant effects of anisotropy. Results: The apparent diffusion coefficients (ADCs) measured, respectively, in the LR and HF directions were (0.699 +/- 0.050) x 10(-3) and (1.805 +/- 0.086) x 10(-3) mm(2) s(-1) in the spinal cord, (1.588 +/- 0.082) x 10(-3) and (1.528 +/- 0.052) x 10(-3) mm(2) s(-1) in the intervertebral disks, and (0.346 +/- 0.047) x 10(-3) and (0.306 +/- 0.035) x 10(-3) mm(2) s(-1) inthe vertebrae of the cervicothoracic spine. Conclusion: Diffusion-weighted spin echo sequences with radial trajectories in k-space provide a means of achieving robust, high quality diffusion-weighted imaging and measuring ADCs in the spine. The application of the diffusion-weighting gradients in different directions allows diffusion anisotropy to be measured. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/01/20 alle ore 16:12:45