View clinical trials related to Magnetic Resonance Imaging.
Filter by:The goal of this study is to investigate children with aortic and pulmonary valve disease treated or untreated longitudinally. Established CMR measures with additional newly developped, promising, highly refined and clinically applicable quantitative imaging biomarkers, will be utilized as compared to the conventional CMR estimates. The main question[s] it aims to answer are: - [question 1]To evaluate risk stratification for surgery and intervention of the aortic- and pulmonary valve - [question 2]Investigate the cardiac and vascular hemodynamic and morphological changes before and after interventional or surgical treatment of the aortic- and pulmonary valve at short and long term. Participants will undergo cardiac MRI before and after interventional or surgical treatment of the aortic or pulmonary valve Researchers will compare MRI data to an age matched control group established at the department in another study.
Brain blood flow will be measured during exercise using magnetic resonance imaging.
The prevalence of cognitive impairment in maintenance hemodialysis (MHD) patients is 3 to 5 times higher than that in ordinary people, so it is essential to find the associated risk factors in this population. This project intends to evaluate whether changes in cerebral blood flow during dialysis have an impact on cognitive function in middle-aged and elderly MHD patients and clarify their influence on brain imaging characteristics. MHD patients who started hemodialysis at 3 to 6 months were selected to examine the difference in middle cerebral artery flow rate before and after dialysis by transcranial Doppler ultrasound to reflect the changes in cerebral blood flow. Changes in the cognitive function scale assessment (memory, executive function, and other five cognitive domains) and brain magnetic resonance imaging examinations are planned to collect both at baseline and after a one-year follow-up. Then the investigator used the multiple linear regression method to analyze the effects of the difference in middle cerebral artery flow on the changes in cognitive function and the characteristics in brain imaging. The investigators anticipate that the characteristics of the influence of changes in cerebral blood flow on cognitive impairment in Chinese MHD patients will be elucidated in this study, which may provide crucial clinical evidence for finding preventive and intervention measures for cognitive impairment in this group of population.
The proposed clinical trial would evaluate the use of smartphone applications ("apps", which have well-established efficacy in reducing cigarette and alcohol use) to prevent relapse among patients receiving medication-assisted treatment for opioid use disorder. In addition to standard app-based self-monitoring of drug use and personalized feedback, project innovation is enhanced by the proposed use of location-tracking technology for targeted, personalized intervention when participants enter self-identified areas of high risk for relapse. Furthermore, the proposed sub-study would use longitudinal functional neuroimaging to elucidate the brain-cognition relationships underlying individual differences in treatment outcomes, offering broad significance for understanding and enhancing the efficacy of this and other app-based interventions.
to determine the rate of asymptomatic gadolinium-enhancing lesions conversion to the non-enhancing black hole (neBHs) with or without corticosteroid pulse therapy in patients with RRMS, and to analyze if treatment of asymptomatic gadolinium enhancement lesions has any effect on the expanded disability status scale. The study is performed in the MS clinic of Bu Ali Sina Hospital in Sari and Mazandaran University of Medical Sciences. 104 recurrent MS patients are admitted based on the admission criteria. They are divided into two groups of intervention and control based on a simple randomization block. The intervention group received 1 gram of methylprednisolone in 500 ccs of normal saline for 5 days and the control group received only 500 ccs of serum. After 6 months, a new MRI is taken from the patients and the possibility of asymptomatic active plaque conversion with or without intervention is compared in the two groups, as well as the amount of EDSS in the two groups. They do not know whether the patient is in the control group or the intervention.
Diabetic pregnancies are often complicated by placental dysfunction with reduced transfer of oxygen from the mother to the fetus, which may compromise fetal growth and organ development. In diabetic pregnancies, hyperinsulinemia and hyperglycemia very often leads to fetal macrosomia. The combination of reduced placental oxygen transfer and increasing fetal demand due to fetal overgrowth may possess a particular risk of adverse pregnancy outcome. Current methods in the antenatal identification of placental dysfunction relies on estimates of fetal size and fetal wellbeing using ultrasound including Doppler flows measurements. These measurements are only indirect estimates of placental function, as no clinical method exists to assess placental function directly. In diabetic pregnancies, the estimates are further limited due to fetal overgrowth and unreliable Doppler. In addition, in diabetic pregnancies, intrauterine fetal weight estimates by ultrasound are inaccurate because of asymmetric fetal growth. Therefore, new accurate methods to assess placental function, fetal oxygenation and fetal growth in this particular group of high-risk pregnancies is highly needed. Early and precise identification of pathology in diabetes pregnancy may lead to an improved outcome in the offspring, as precise identification of pathology facilitates important obstetric decisions in regards to maternal antidiabetic treatment and timing of delivery. Resent research indicates that MRI is useful for this purpose. It is well described, that preeclampsia is associated with an increased maternal risk of cardiovascular disease later in life. Recent studies suggest, that pregestational subclinical cardiovascular dysfunction, in particular left ventricular dysfunction, may increase the risk of preeclampsia and fetal growth restriction during pregnancy. Cardiac MRI is a sensitive method to detect subclinical maternal cardiac dysfunction, which may be used in identification of high-risk pregnancies. In addition, the longitudinal design of this study allows for the investigation of cardiovascular changes during pregnancies in normal pregnancies and pregnancies complicated by diabetes. The overall aim of this study is to improve the antenatal fetal and maternal monitoring in diabetes pregnancies. Early and precise identification of pregnancy pathology provides a better basis for important obstetric decisions regarding antidiabetic treatment, monitoring intervals and timing of delivery, which leads to a better outcome for the mother and offspring. Hypothesis Project A: Placental function and fetal oxygenation in diabetic pregnancies estimated by T2* weighted placental and fetal MRI Aim: To investigate placental function and fetal oxygenation by longitudinal T2* weighted placental MRI and the association with pregnancy complications. Hypothesis: - Diabetic pregnancies are characterized by placental hypoxia (low T2* value) - Diabetic pregnancies are characterized by fetal hypoxia (low T2* value) - Fetal and placental hypoxia is a risk factor of placental related complications in pregnancy such as low birth weight, preterm delivery, acute cesarean sections and preeclampsia. Project B: Fetal growth and the growth of selected fetal organs in diabetic pregnancies estimated by longitudinal MRI volumetry Aim: To investigate growth velocity of the fetus and selected fetal organs and the correlation with pregnancy complications. Hypothesis: - Diabetic pregnancies are characterized by accelerated fetal growth in the third trimester - Diabetic pregnancies are characterized by asymmetric growth (reduced brain/liver-volume ratio) - Abnormal fetal growth is associated with dysregulated maternal diabetes. - Abnormal fetal growth is a risk factor of pregnancy complications such as; macrosomia, preterm delivery and acute cesarean sections. Project C: Maternal cardiac function in diabetic pregnancies estimated by MRI Aim: To investigate maternal cardiac function and the correlation with pregnancy complications such as preeclampsia and fetal growth restriction. Hypothesis: - Maternal cardiac function is altered in diabetes pregnancies when compared to normal pregnancies. - Impaired cardiac function (left ventricular dysfunction) is a risk factor of preeclampsia and fetal growth restriction.
The purpose of this study is to examine if investigators can improve diagnosis of prostate cancer by using MRI/DTI?
Aim of this study is to better understand pathophysiology of the alteration of respiratory mechanics and cardiovascular function in obese volunteer subjects. The investigators plan to test this hypothesis with a physiological, interventional study conducted on volunteers by using Electrical Impedance Tomography in a group of patients and magnetic resonance imaging (MRI) in another group.