View clinical trials related to MRI.
Filter by:It is very significant that assessing staging in gastric cancer patients before surgery, furthermore, determining the optimize surgical strategy ,predict the the efficacy of neoadjuvant therapy for patients. For patients who are ineffective in neoadjuvant therapy, surgery will be more meaningful. It has been reported that the application of CT(computed tomography,CT) and MR(magnetic resonance,MR) in staging of gastric cancer, but not in predicting clinical response to neoadjuvant therapy for gastric cancer. Only a few studies focused on T staging using conventional MRI in gastric cancer, however , relatively new sequences in the chest deserve widely used. To develop a pre-treatment evaluation methods for TN staging in patient with gastric cancer by utilization of the new imaging methods (T2-TSE-BLADE,T2 maps, StarVIBE, iShim-DWI and high resolution CT). By analysing the relationship between TN staging and imaging features to find the imaging characteristics for TN staging, and to find the indicators of new technology and reference values for facilitate pre-treatment diagnosis of TN staging, optimize surgical strategy , predict the the efficacy of adjunctive therapy , and OS and define the range of lymph node for radiotherapy , as making personal treatment planning for gastric cancer .
This is a database study of clinically indicated MRIs on patients with permanent pacemakers and implantable cardioverter defibrillators.
In nuclear medicine PET examinations, labeled radiopharmaceuticals are possible to enter the putamen and caudate nucleus regions of the striatum in the brain by intravenous injection. The severity of Parkinson's disease is assessed and diagnosed by quantitative analysis of the defect in the image of the radiopharmaceuticals. Clinical studies often use manual selection of regions of interest (ROIs) for quantitative analysis. However, this method causes human error and low reproducibility due to subjective factors, and also considerable time consuming. Therefore, in order to solve the above problems, this research project plans to build an automated quantitative analysis system for PET/MRI images. The quantitative analysis of the PET images is performed automatically by using the putamen and caudate ROI segmented by the MRI images. This automated quantitative analysis system is expected to improve the time-consuming, low reproducibility, and subjectivity problems of traditional manual ROI selection method, and provide a useful tool for the diagnosis of early PD. In the first year, this sub-project is expected to perform MRI T1 and 18F-FDOPA PET scanning of before and after acupuncture-treated PD patients provided by sub-project 3. In the second year, the correlation analysis will be made with the results of tremor test provided by sub-project 1 and that of the 99mTc-TRODAT SPECT image quantification provided by sub-project 4.
Under the prostate cancer screening protocol of the project 'Prevention of Obesity-related Cancers', men with elevated PSA with higher prostate cancer risk (PSA 4-10 ng/mL with high Prostate Health Index (PHI) ≥35, or PSA>10 ng/mL) will be offered a prostate biopsy. In the current study, we would like to offer all screened men with elevated PSA in the range of 4-50 ng/mL a biparametric non-contrast MRI prostate (screening protocol) for any suspicious lesion in the prostate. If there is MRI lesion seen, additional targeted biopsies can be performed on top of the standard systematic prostate biopsies. It has been shown in a clinical Caucasian cohort that doing MRI-targeted biopsies resulted in improved detection of clinically significant prostate cancer compared with standard systematic biopsies. In this study investigators would like to investigate the benefits of adding MRI prostate and MRI-targeted biopsy in the diagnostic pathway for prostate cancer in a screened cohort of Chinese men at risk of prostate cancer.
This is a combination retrospective/prospective observational study with two arms:
IRM-DU is a prospective observational single center study conducted in an emergency department to evaluate the impact of a MRI scanner exclusively dedicated to emergency in the clinical management of patients presenting with dizziness or diplopia. The study will compare 2 strategies : after and before availability of a MRI scanner dedicated to emergency. The primary endpoint is the proportion of patients with a diagnosis of stroke confirmed by imaging (MRI or Computed tomography (CT)) in the group "before implementation of the emergency MRI scanner" and the group "after implementation of the emergency MRI scanner". The hypothesis is that the availability of a MRI scanner dedicated to emergency will improve the diagnosis of stroke in patients presenting with dizziness or diplopia, and will reduce Emergency Department stay, hospital stay and hospitalisation costs.
Back pain costs the U.S. over $100 billion annually, and much of this spending is wasteful due to the overuse of advanced diagnostic imaging. Despite prominent clinical guidelines and the nationally recognized Choosing Wisely campaign discouraging use of costly and low value imaging, magnetic resonance imaging (MRI) and computed tomography (CT) studies remain frequently overused. Real-time electronic clinical decision support (CDS) at the point of care has been increasingly emphasized as an important strategy to improve the value of back pain management; however, studies suggest that CDS at best only modestly influences practice patterns. The aim is to implement a behavioral economic-based intervention in the ED to promote the use of CDS system.
This study with standardized reading MRIs, will provide for the first time objective and quantified data on organomegaly (liver and spleen volumes) as well as bone alteration (Bone Marrow Burden11) of French patients treated with VPRIV®. These data will help to better assess the impact of this treatment on these parameters. The result of this study will also answer in part to the request of the French Transparency Commission (CT: Commission de Transparence) of the French National Health Authority to provide them with data of French patients treated with VPRIV®.
Quantification of hepatic fibrosis by IVIM sequences in 1.5T MRI.
Evaluation of 4 MRI methods (PDFF 3, 6 and 11 gradient echoes and Spectroscopy) compared to the reference method (liver biopsy) in quantification of hepatic steatosis