View clinical trials related to Computed Tomography.
Filter by:Small intestinal contrast ultrasound (SICUS) is a modality of intestinal ultrasound (IUS) which does not require any parenteral administration of contrast agent but requires ingestion of around 500 ml of polyethylene glycol (PEG). SICUS does not involve any radiation. Computed tomography enteroclysis (CTE) requires colonic cleansing using polyethylene glycol (PEG) followed by infusion of 1.5 litres of PEG via a nasal catheter to distend and properly visualise the small intestine. CTE although accurate for assessing response to therapy and transmural healing in small bowel CD is associated with radiation and adds to cost of management. Magnetic resonance enterography (MRE) using PEG followed by 2 liters of oral fluid with mannitol was administered to distend and properly visualize the small intestine. MRE although accurate for assessing response to therapy and transmural healing in small bowel CD is associated with radiation and adds to cost of management. On the other hand, SICUS is relatively non-invasive method of small bowel assessment although the accuracy has not been studied prospectively. An earlier retrospective study in which MRE/CTE and SICUS are done within 3 months of each other, SICUS had identified lesions and complications in patients with CD with high levels of sensitivity, specificity, and accuracy compared to CT-enteroclysis (3). These findings need prospective validation. The accuracy of SICUS may be suboptimal due to constant peristalsis in the small intestine. Hence the investigators planned this study to perform SICUS in patients with small bowel CD who otherwise require a MRE/CTE for disease monitoring on the same day before the procedure with the same PEG preparation. If SICUS findings are found to correlate with MRE/CTE findings intros study, SICUS have the potential to replace other modalities for monitoring of small bowel Crohn's disease (CD) and emerge as a cost-effective, easy alternative. The investigators also want to understand the drawbacks and limitations of SICUS in this scenario.
The study focuses on regional lung examination, in particular on the differentiation between collapsed and hyperinflated lung areas. The purpose of the study is to elaborate common and discriminative elements between different lung imaging modalities in infants and to generate hypotheses for the bedside use of EIT and LUS in infants.
The investigators decided to conduct a longitudinal study that compares the pulmonary tomographic patterns found in patients with viral pneumonia (i.e. influenza H1N1 and SARS-CoV-2) at a regional hospital. The primary aim of this study is to compare the radiological patterns found in patients with COVID-19 and influenza H1N1. The secondary aims of this study will assess the association between the radiological CT pattern and the need for invasive mechanical ventilation and mortality within the first 28 days of intensive care unit admission.
European lung cancer screening studies using computed tomography (CT) have shown that a management protocol based on measuring lung nodule volume and volume doubling time (VDT) is more specific for early lung cancer detection than a diameter-based protocol. However, whether this also applies to a Chinese population is unclear. The aim of this study is to compare the diagnostic performance of a volume-based protocol with a diameter-based protocol for lung cancer detection and optimize the nodule management criteria for a Chinese population.
Apply CT angiography, CT perfusion imaging and advanced image processing techniques to improve revascularization decision-making and surgical strategies in patients undergoing coronary artery bypass graft surgery.
The purpose of this study is to compare the incidence rate of leukemia between CT-exposed and CT-unexposed group in patients who underwent appendectomy in South Korea.