Showing papers by "Marc-Etienne Meyer published in 2006"
TL;DR: To evaluate the contributions of phase‐contrast magnetic resonance (PCMR) and transcranial color Doppler (TCCD) imaging in the investigation of cerebral hydrodynamics, a parallel approach to TCCD is proposed.
Abstract: Purpose
To evaluate the contributions of phase-contrast magnetic resonance (PCMR) and transcranial color Doppler (TCCD) imaging in the investigation of cerebral hydrodynamics.
Materials and Methods
A total of 13 healthy subjects were studied. Blood velocity measurements were performed with TCCD and gated PCMR imaging in major intracranial and extracranial arteries stages. Peak systolic velocity and end-diastolic velocity were extracted to establish correlations between TCCD and PCMR imaging. Cerebral blood flow (CBF) and intracranial volume change (IVC) during the cardiac cycle were calculated, taking into account cerebrospinal fluid (CSF) oscillations.
Results
Despite an underestimation of velocities with PCMR imaging, significant correlations were observed for velocity measurements between the two modalities in extracranial vessels, but were poorly correlated in intracranial vessels. PCMR data processing gave a mean CBF of 690 ± 90 mL/minute.
Conclusion
PCMR imaging provides complementary information to TCCD to assess various intracranial parameters such as instantaneous velocities, blood and CSF flow distributions, volume variation, or pressure regulation mechanisms during cardiac cycles. J. Magn. Reson. Imaging 2006. © 2006 Wiley-Liss, Inc.
73 citations
TL;DR: In this paper, the authors describe the contribution of this technique in diseases related to disorders of cerebral hydrodynamics in the light of 5 clinical cases using a 1.5 Tesla MR imager in 4 patients with symptomatic ventricular dilation and 1 patient with syringomyelic cavity.
48 citations
TL;DR: In this article, the authors explore the alterations possibles of the dynamique of fluxes of liquide cerebro-spinal (LCS) lors des hemorragies meningees (HM).
4 citations
TL;DR: In this paper, a protocole clinique d'acquisition, traitement, and analysis of flux cardiaques is tablir, based on a morphologie des courbes de flux reconstruites, to define caracteristiques d'evolution temporelle propres.
Abstract: Objectifs Etablir un protocole clinique d’acquisition, de traitement et d’analyse des flux cardiaques. Materiels et methodes La sequence cinetique rapide par contraste de phase, d’une duree moyenne de 2 min par vaisseau, est utilisee en double synchronisation cardiaque et respiratoire. L’aorte, les veines caves et les arteres pulmonaires sont explorees. Le reperage est effectue sur les sequences morphologiques 2D/3D fiesta. L’analyse des images est realisee sur un logiciel developpe sur le site. Les flux de 7 temoins adultes sont mesures sur 32 phases d’un cycle cardiaque. Resultats L’analyse de la morphologie des courbes de flux reconstruites a permis de definir les caracteristiques d’evolution temporelle propres a chacun des vaisseaux explores. Les debits moyens mesures sont : aorte ascendante 5,3±1,1 1/mn ; aorte descendante 3,9±1 1/mn ; artere pulmonaire 5,4±0,8 1/mn ; veine cave inferieure 3,9±1,3 1/mn ; veine cave superieure l,8±0,4 1/mn. Conclusion La double synchronisation cardio-respiratoire permet une acquisition en respiration libre compatible avec la routine clinique. L’inclusion d’un grand nombre de temoins nous permettra de definir une base de reference des parametres temporels et quantitatifs des flux cardio-vasculaires. L’IRM de flux est une information fonctionnelle complementaire dont l’apport dans l’etude des pathologies cardiovasculaires reste a evaluer.