Amélioration du contraste IRM pour une caractérisation renforcée de la morphologie et de l'activité cérébrales
Cette étude vise à développer et à évaluer de nouvelles techniques d'IRM pour obtenir une vue plus claire de la structure et de l'activité cérébrale à différentes puissances de champ, le résultat primaire étant la capacité d'acquérir robustement des images détaillées de l'ensemble du cerveau sensibles à divers facteurs tels que la myéline, le fer et le flux sanguin.
Collecte de données
Données recueillies dès le début de l'étude - ProspectiveCohorte
Suivi d'un groupe de personnes dans le temps pour mieux comprendre les causes et l'évolution d'une maladie.Résumé
Date de début de l'étude : 1 juillet 2000
Date à laquelle le premier participant a commencé l'étude.Objective The goal of this protocol is to improve spatial resolution and contrast in MRI studies of brain anatomy and function, by developing novel hardware, and image acquisition and reconstruction techniques. Specifically, by improving MRI image quality and manipulating MRI contrast, we aim to better characterize and quantify structural, chemical, and blood flow variations across the brain, and study their relationship with neuronal activity. For this purpose, we will develop and optimize novel MRI techniques on normal, healthy volunteers, and combine these with EEG and recording of other physiological signals. Study Population Any healthy, male or female volunteer 18 years of age and older; the subjects must be capable of understanding the procedures and requirements of this study and be willing to sign an informed consent document. Design This is a technical development study design to develop and evaluate new MR technology for performing MRI and functional MRI in the CNS with novel contrasts and with a high spatial resolution. Outcome Measures The primary outcome of this study will be the ability to acquire anatomical and functional images of the human brain with high spatial resolution, i.e., 200-500 micron and 750-1000 micron respectively. In addition, developed techniques will allow the robust measurement of specific tissue properties, including diffusion, structural anisotropy, iron and myelin content, perfusion, and metabolite concentrations. The relative merits of blood flow and blood oxygenation level dependent (BOLD) functional MRI (fMRI) techniques, and their particular spatial and temporal signal characteristics will be established. It will be determined whether information valuable to interpret BOLD fMRI can be derived from EEG and other physiological signals.
Protocole
Cette section fournit des détails sur le plan de l'étude, y compris la manière dont l'étude est conçue et ce qu'elle évalue.1100 participants à inclure
Nombre total de participants que l'essai clinique vise à recruter.Cohorte
Éligibilité
Les chercheurs recherchent des patients correspondant à une certaine description appelée critères d'éligibilité : état de santé général ou traitements antérieurs du patient.Tout sexe
Le sexe biologique des participants éligibles à s'inscrire.De 18 à 120 ans
Tranche d'âge des participants éligibles à participer.Volontaires sains autorisés
Indique si les individus en bonne santé et ne présentant pas la condition étudiée peuvent participer.Critères
* INCLUSION CRITERIA: * 18 years of age and older * in good general health * able to understand the procedures and requirements and give informed consent EXCLUSION CRITERIA: All Subjects will undergo a neurological physical and answer the Healthy volunteer form, and the most-recent version of the NMR safety screening form A subject will be excluded if he/she: 1. has any metal implant or objects of unknown identity or composition, or if it s known to be non-compatible with MRI, such as pacemakers, medication pumps, aneurysm clips, metallic prosthesis (such as heart valves or cochlear implants), certain orthopedic implants (pins and rods), shrapnel, or small metal fragments in the eye; 2. has claustrophobia; 3. cannot lie comfortably for up to 120 minutes; 4. underwent brain surgery or suffered a traumatic head trauma; 5. has migraines that require medication; 6. has ever been hospitalized for a psychiatric disorder; 7. has medical health problems such as pulmonary or airway disease, heart failure, coronary artery disease, and uncontrolled hypertension which would require physiological monitoring during the scan; 8. has a history of any medical condition that could result in an emergency medical situation while undergoing the MRI scan; 9. has hearing problems which would make it difficult to tolerate scanner noise; 10. is pregnant; 11. has body/make-up tattoos (e.g. lips, eyebrows, eyeliner). Each tattoo will be considered on a case-to-case basis, taking into account of the age and location of the tattoo; 12. has a sleep apnea diagnosis; 13. has a neurological disorder, such as Stroke, Parkinson s, and Epilepsy; 14. a member of the NINDS Laboratory of Functional and Molecular Imaging. The contraindications to MRI at the various field strengths are almost identical, except the 7 T also excludes subjects with gold dental crowns.
Plan de l'étude
Découvrez tous les traitements administrés dans cette étude, leur description détaillée et ce qu'ils impliquent.Un seul groupe d'intervention est désigné dans cette étude
Cette étude ne comporte pas de groupe placebo.
Groupes de traitement
Objectifs de l'étude
Objectifs principaux
Objectifs secondaires
Centres d'étude
Ce sont les hôpitaux, cliniques ou centres de recherche où l'essai est conduit. Vous pouvez trouver le site le plus proche de vous ainsi que son statut.Cette étude comporte 1 site
National Institutes of Health Clinical Center
Bethesda, United StatesOuvrir National Institutes of Health Clinical Center dans Google Maps