View clinical trials related to MRI.
Filter by:The analysis of portal vein blood flow is important when assessing the severity and progression of liver disease. It is important to understand normal liver regulation in order to appreciate the evaluation of the effect of treatment during the disease progression. The influence of respiration on hepatic hemodynamics is still poorly understood, although some studies have shown a significant impact. The purpose of this project is to quantify the blood flow variations in the portal vein at different positions during the respiratory cycle by using a fast MRI sequence and an Echo Planar (EPI) acquisition.
HFNO CAN BE USED AS A PREOXYGENATION TECHNIQUE BUT IS IT A SAFE TECHNIQUE IN TERMS OF GASTRIC INSUFFLATION?
Patients who have agreed to participate in the study will complete the MRI protocol as part of routine care, to which two additional sequences of 6 minutes duration will be added. The MRI of routine care includes at least the following sequences: - 3D T1 TFE 1.0 isotropic (2 minutes) - T2 TSE (2 minutes) - 3D FLAIR pre-injection (opt) (3 minutes) - 3D FLAIR post-injection (3 minutes) As part of the research, the following sequences will be acquired: - FABIR pre-injection (3 minutes) - FABIR post-injection (3 minutes) Patients hospitalized for a foreseeable duration of at least 24 hours will be offered participation in the longitudinal tab of the study, for which four non-injected MRI examinations will be performed. The examinations will be carried out remotely from the injected MRI (1h, 2h, 12h-15h, 24h-36h). These exams dedicated to research will include the following sequences for a maximum of 8 minutes: - 3D T1 TFE 1.0 isotropic (2 minutes) - 3D FLAIR (3 minutes) - FABIR (3 minutes)
Post hepatectomy liver failure (PHLF) is one of the most severe complications after liver re-section. Preoperative evaluation of liver function is complicated and imprecise. The volume and function needed for each individual patient is unknown and the methods used for evaluation are uncertain. Preoperative MRI with Gadolinium may give dynamic information regarding liver function correlating with postoperative liver failure. A retrospective analysis will be performed regarding this topic.
An increasing number of studies have reported the use of dexmedetomidine in clinical practice. However, few studies have reported on the intranasal use of dexmedetomidine in radiological procedures The aim of this work is to compare the efficacy and safety of intranasal dexmedetomidine and intranasal midazolam in pediatrics undergoing MRI.
We prospectively collected information on consecutive patients who had been evaluated using 4D PC-MRI for aortic pathology in a tertiary hospital between April 2018 and Feb 2020. Patients were eligible for inclusion in the study if they had a clinical indication for CTA of aortic dissections.
To explore whether there is a difference in the rate of tendon tear after hyperlipemia in tennis elbow patients and those with normal blood lipids after closed treatment, which provides clues for further exploration of its mechanism. 1. Collect data from 108 cases of tennis elbow patients treated at the Institute of Sports Medicine, Peking University Third Hospital from January 2010 to December 2018 at the Institute of Sports Medicine, Peking University Third Hospital. Statistics included the sex, age, BMI, number of closures, total cholesterol, triglycerides, low-density lipoprotein, high-density lipoprotein. 2. Retrieve the MRI imaging data of the above-mentioned patients, and use the extensor tendon at the humerus to see if there is a tear as an observation indicator. Analyze the difference of tendon tear after closed treatment in patients with high blood fat and normal blood fat.
This trial was designed to to study whether there is a difference in MRI image evaluation between NCRT and NCT, and try to build a model to predict the efficacy of neoadjuvant therapy by combining multiple imaging indexes.
Magnetic resonance imaging (MRI) is a non-invasive imaging modality used in routine clinical practice for clinical diagnosis by visualizing the anatomical structure and in vivo function of certain organs. The development of ultra-high field MRI systems with 7.0-T or higher, gives access to a new field of exploration of the human body by improving the speed of acquisition but also a better signal-to-noise ratio (SNR) and better resolution. In order to fully exploit the potential of these ultra-high field MRI scanners, various technical issues must be adressed. Indeed, the non-uniformity of the transmission field is one of them leading to non-uniform images with spatially varying contrast. Thus the pTX (parallel transmission) mode using multiple transmission channels allows spatial and temporal control over the RF waves.
The study's purpose is to validate STAGE images and, when applicable, their equivalence to conventional MRI through an assessment by a trained certified neuroradiologist in a clinical setting. For STAGE images without conventional equivalent, the neuroradiologist will determine if their contrasts, intensities, and quality are sufficient and meet expectations for images used in radiological reads of the brain. The study is a multi-center study in which STAGE can be assessed at sites with different MRI manufacturers and field strengths. Site names will be made available to the collaborators and participants. The sponsor is based out of Michigan, while participating sites may be located in other states. Any funding for the study will come from an industry source, SpinTech, Inc.