Search results for "MRI."

showing 10 items of 591 documents

Problēmrisināšanas stratēģijas izziņas darbības aktivizēšanai vidusskolas matemātikā

2019

Problēmrisināšanas stratēģijas izziņas darbības aktivizēšanai vidusskolas matemātikā. Laila Vītola, darba vadītāja mg. paed. Aira Kumerdanka. Darbā aplūkots domāšanas process, izziņas darbības aktivizēšana, izmantojot problērisināšanas stratēģijas vidusskolas matemātikā. Darba mērķis: kā aktivizēt izziņas darbību vidusskolas vecuma skolēniem, izmantojot problēmrisināšanas stratēģijas? Darba uzdevumi: 1.analizēt teorētisko informāciju par domāšanu; 2.apkopot stratēģijas, kas veicina domāšanas darbības attīstību un pilnveidošanu; 3.izveidot metodiskos materiālus; 4.aprobēt metodiskos materiālus. Pētījumā secināts, ka skolēniem trūkst zināšanu un prasmju problēmrisināšanas stratēģiju izmantoša…

Pedagoģijamatemātikadomāšanaproblēmrisināšanastratēģija
researchProduct

Radošās domāšanas attīstošie uzdevumi vizuālā mākslā 3. klasē

2017

Cilvēka domāšanas pamatā ir vizuāla informācija, kuru jāprot pārveidot un lietot gan ikdienišķos procesos, gan dažādās problēmsituācijās. Informācijas pārplūduma laikā ir svarīgi faktus spēt lietot, tos mācēt izmantot, saprast un attēlot. Šo prasmi apgūst, attīstot radošo domāšanu. Procesa pamatā ir iztēle, kura veidojas no atsevišķiem attēliem – atmiņu un pieredzes mozaīkām. Jau no agras bērnības cilvēks mēģina attēlot, kārtot, parādīt savas domas ar zīmēšanas palīdzību. Viens no veidiem, kā attīstīt radošo domāšanu, ir veicināt to ar zīmēšanu. Pētījumā tiek izveidota uzdevumu kopa radošās domāšanas attīstīšanai vizuālajā mākslā 3.klasē. Rezultātu apkopošanai izmantota pedagoģiskā dienasgr…

Pedagoģijaradošā domāšanaproblēmrisināšanaradošumsidejazīmēšana
researchProduct

Clinical and Brain Imaging Findings in a Child with Vitamin B12 Deficiency

2021

Vitamin B12 (Vit-B12) deficiency is a rare and treatable cause of failure to thrive and delayed development in infants who are exclusively breastfed. Apart from genetic causes, it can be related to a malabsorption syndrome or when the mother follows a strict vegetarian or vegan diet, causing a low hepatic storage of Vit-B12 in the infant at birth. As the neurological symptoms are nonspecific, a brain magnetic resonance imaging (MRI) exam is usually performed to rule out primary causes of neurodevelopmental delay. Findings related to brain atrophy are usually observed. A favorable response is achieved with Vit-B12 therapy, and neurological symptoms dramatically improve within a few days afte…

Pediatricsmedicine.medical_specialtyMalabsorptionmagnetic resonance imaging (MRI)business.industryRSettore MED/37 - Neuroradiologianutritional and metabolic diseasesCase ReportVegan Dietvitamin B12medicine.diseasePediatricsRJ1-570AtrophyNeuroimagingFailure to thriveMedicineMedicineBrain magnetic resonance imagingVitamin B12medicine.symptombusinessAfter treatmentbrain atrophy
researchProduct

A multicenter measurement of magnetization transfer ratio in normal white matter

1999

To assess the importance of intercenter variations when measuring magnetization transfer ratio (MTR) in the brain, six European centers measured MTR in normal white matter. MTR ranged from 9 to 51 percent units (25 sequences). The effective flip angle of the saturating pulse divided by the pulse repetition time (ENRsat degrees/msec) was a good predictor of MTR (MTR = 3.25 ENRsat).

PhysicsDrug trialMagnetization Transfer MRIbusiness.industryWhite mattermedicine.anatomical_structureRepetition TimeFlip anglemedicineBrain mriRadiology Nuclear Medicine and imagingMagnetization transferNuclear medicinebusinessJournal of Magnetic Resonance Imaging
researchProduct

Switching synchronization in one-dimensional memristive networks: An exact solution.

2017

We study a switching synchronization phenomenon taking place in one-dimensional memristive networks when the memristors switch from the high- to low-resistance state. It is assumed that the distributions of threshold voltages and switching rates of memristors are arbitrary. Using the Laplace transform, a set of nonlinear equations describing the memristors dynamics is solved exactly, without any approximations. The time dependencies of memristances are found, and it is shown that the voltage falls across memristors are proportional to their threshold voltages. A compact expression for the network switching time is derived.

Physicsbusiness.product_categoryLaplace transformMemristorTopology01 natural sciencesSynchronization010305 fluids & plasmaslaw.inventionNonlinear systemComputer Science::Emerging TechnologiesExact solutions in general relativitylaw0103 physical sciencesNetwork switchState (computer science)010306 general physicsbusinessVoltagePhysical review. E
researchProduct

Brain structural alterations in Fabry disease: ROI-based and voxel-based analyses of diffusion tensor imaging parameters

2007

Physicscomputer.software_genremedicine.diseaseFabry diseaseSensory SystemsNuclear magnetic resonanceNeurologyVoxelPhysiology (medical)medicineNeurology (clinical)PsychologycomputerNeuroscienceDiffusion MRITractographyClinical Neurophysiology
researchProduct

Stability and Chaotic Attractors of Memristor-Based Circuit with a Line of Equilibria

2019

This report investigates the stability problem of memristive systems with a line of equilibria on the example of SBT memristor-based Wien-bridge circuit. For the considered system, conditions of local and global partial stability are obtained, and chaotic dynamics is studied. peerReviewed

Physicskaaosteoriaelektroniset piiritChaoticpartial stabilitymemristoritMemristorTopologyStability (probability)Line (electrical engineering)law.inventionComputer Science::Emerging Technologieshidden attractorsPartial stabilitylawAttractorkaaosmatemaattiset mallitmemristor
researchProduct

Sadarbības prasmes sekmēšana 5-7 gadus veciem bērniem pētnieciskajā darbībā

2021

Kvalifikācijas darba autore , Ērika Preinberga, veica pētījumu ,,Sadarbības prasmes sekmēšana 5-7 gadus veciem bērniem pētnieciskajā darbībā”, lektores Mg. paed. Rūtas Vocišas vadībā. Kvalifikācijas darba mērķis: Izpētīt 5-7 gadus vecumu bērnu sadarbības prasmju sekmēšanu pētnieciskajā darbībā un apkopot ieteikumus 5-7 gadu vecu bērnu iespējām sadarbības prasmju sekmēšana pētnieciskajā darbībā. Darba uzdevumi: •Analizēt pedagoģisko un pedagoģiski psiholoģisko literatūru par sadarbības prasmi, pētniecisko darbību, 5-7 gadus vecu bērnu attīstības tendencēm; •Noteikt 5-7 gadus vecu bērnu sadarbības prasmes sekmēšanu pētnieciskajā darbībā reālajā pedagoģiskajā procesā; •Izpētī un apkopot ieteik…

Pirmsskolas pedagoģijapirmsskolapētniecībapētnieciskā darbībasadarbības prasmesproblēmrisināšnas prasmes
researchProduct

Synthèse de nouveaux agents bimodaux hydrosolubles pour l'IRM, l'imagerie nucléaire, l'imagerie biphotonique et la génération de second harmonique

2015

The goal of my PhD studies was to synthesize new compounds for possible medical imaging applications. The first part of my thesis focused on the synthesis of heteroleptic ligands to achieve the chelation of two different metals aimed at addressing two types of medical imaging. We first synthesized porphyrins, which are well-known for the chelation of numerous transition metals. We focused on copper, whose copper-64 isotope is a β+ emitter usable in Positron Emission Tomography (PET). These porphyrins have been coupled with a DOTA derivative. This molecule, metallated with gadolinium, is well-known in Magnetic Resonance Imaging (MRI). Our compounds display encouraging relaxivities for MRI ap…

PorphyrinsNonlinear opticsTétraazamacrocycles[CHIM.ORGA]Chemical Sciences/Organic chemistryTetraazamacrocyclesRelaxivité[CHIM.ORGA] Chemical Sciences/Organic chemistrySHGIRM / TEPPorphyrinesOptique non-linéaire[ CHIM.ORGA ] Chemical Sciences/Organic chemistryHyperpolarizabilityGSHHyperpolarisabilitéMRI / PETRelaxivityDPPTPEFF2P
researchProduct

Right ventricular diastolic function in post-surgical Tetralogy of Fallot patients: A pilot study to make a comparison between echocardiography and c…

2021

Background: right ventricular (RV) systolic dysfunction is associated with poor outcomes in Tetralogy of Fallot (ToF) patients. Conversely, the influence of diastolic dysfunction in this setting is poorly known. In addition, evaluation of RV diastolic function by cardiac MRI is rarely performed.Materials and methods: twenty-four surgically treated ToF patients were enrolled in the study (54% males; median age at study: 28 (18–50) years; median age at surgery: 1.9 (0.4–8.2) years. They were studied by echocardiography to assess RV diastolic function in terms of traditional and TDI-derived parameters. At cardiac MRI, RV diastolic function was assessed by using phase-contrast analysis of flow …

Post surgicalmedicine.medical_specialtyTricuspid valveShort axisbusiness.industryDiastolemedicine.diseaseTetralogy of fallotmedicine.anatomical_structureEchocardiographyDiastoleInternal medicineRC666-701CardiologyMedicineDiseases of the circulatory (Cardiovascular) systemDiastolic functionbusinessCardiac MRITetralogy of FallotCongenital heart diseaseInternational Journal of Cardiology Congenital Heart Disease
researchProduct