View clinical trials related to Computed Tomography.
Filter by:A considerable number of patients presented with anatomically successful PCI results still suffer from functionally unresolved ischemia, which might be the cause for over one-fourth of patients experiencing recurrent angina at 1 year or adverse events at 2 years. Currently, the post-PCI physiology measurement is one of the effective metrics to quantify residual ischemia, and a suboptimal post-PCI result is strongly associated with worse outcomes. However, PCI optimization based on post-PCI physiology is, to certain extent, a provisional rescue action for a suboptimal index procedure, which may not be fully correctable "after the fact" given selected stents, site of deployment and procedural technique. Computed tomography (CT) coronary physiology-derived virtual stenting (CT-VS) based on pre-PCI CCTA angiograms is an augmented reality (AR) approach that simulates the post-stenting physiology assuming that the specified segment of the treated vessel is successfully dilated by implanting virtual stents. Previous studies have demonstrated the feasibility of optimizing PCI with CT-VS, with high consistency between pre-PCI simulated physiology result by CT-VS and actual post-PCI physiology results. Therefore, the application of CT-VS would help physicians to develop the best strategies while planning the procedure. However, there is a lack of knowledge regarding the efficacy of this novel physiological index that is available pre-PCI in achieving final post-PCI optimal physiological result. The Trials of "Computed Tomography Coronary Physiology-derived Virtual Stenting Guided Revascularization Strategy in Patients with Coronary Artery Disease (CT-COMPASS)" was designed to assess the efficacy of a CT-VS vs. standard angiographic guidance in achieving post-PCI optimal physiological result (post-PCI FFR≥0.90).
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.
This study examines the effect of music during computed tomography in children. This study, conducted on a total of 60 children, was divided into two groups: the music group and the control group. According to the research results; showed that music reduces fear and anxiety levels in children and stabilizes vital signs (pulse and respiratory rate) during a tomography scan.
A total of 9269 adults who received CCTA scans for coronary disease evaluation during a general medical checkup at the Health Screening and Promotion Center in Asan Medical Center, Seoul, Korea between January 2007 and December 2011 were initially selected. All participants were provided with information about the potential benefits and risks of CCTA and made the decision to undergo the procedure at their own expense. They were also informed that their clinical and radiological data would be used for this study and gave their consent. Of these individuals, 7129 agreed to participate, and 6343 were enrolled in this CCTA registry.
The purpose of this study is to assess the degree of sarcopenia by CT and to analyze its association with morbidity and mortality after esophagectomy and / or total gastrectomy. It is also intended to analyze the association between the degree of the CT-guided sarcopenia and the nutritional status of the patients evaluated by clinical parameters, both preoperative and postoperative. Besides that, to verify the association between the degree of sarcopenia and body fat rate.
Dacryocystitis and nasolacrimal duct obstruction are the main common causes of epiphora. Dacryocystorhinostomy (DCR) is a widely used and effective treatment for dacryocystitis and nasolacrimal duct obstruction. Among these cases, some patients have space-occupying lesions in the lacrimal sac area, such as dacryoliths, mucoceles, granulomas, and even tumors. For patients with lacrimal sac tumors, a more complex treatment plan needs to be adopted, and the severity of the disease and the complexity of treatment should be informed before surgery, since more than 55% of lacrimal sac tumors are malignant. Therefore, preoperative diagnosis and identification of lacrimal sac space-occupying lesions is important. For lack of imaging examinations, and the symptoms of patients with space-occupying lesions are often similar to those of dacryocystitis and nasolacrimal duct obstruction, which lead to the diagnosis of lacrimal sac space-occupying lesions was not discovered before DCR. CDU has been used for the observation of lacrimal gland tumors. This study has attempted to assess the CDU and CT dacryocystography characteristics of the lacrimal sac space-occupying lesions.
In thoracic surgery, one-lung ventilation using a double-lumen tube (DLT) is often performed to protect dependent lung and provide comfortable surgical conditions. However, serious complications and adverse events can be encountered during DLT placement. One of the most important steps to avoid these drawbacks is to choose the appropriate size of DLT. The width of the trachea can be measured by using different imaging methods such as computed tomography (CT) and ultrasonography (US) to predict the appropriate DLT size. CT can also contribute to the proper placement of DLT by giving us the length of the trachea and main bronchi. In this study, we hypothesized that the size of the DLT can be determined more accurately by measuring the trachea diameter by using US and CT before DLT intubation. At the same time, we aimed to determine whether the evaluation of tracheobronchial anatomy with CT would contribute to the placement of DLT at a more appropriate level.
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.
To examine inter-subject variations of optimal late arterial phase contrast-enhancement defined as the greatest difference in contrast attenuation of hepatocellular carcinoma (HCC) compared to background liver parenchyma resp. pancreatic lesions compared to pancreatic parenchyma. To evaluate which time-points best depict an optimal late arterial phase.
Thymoma is the most common primary tumor of the anterior mediastinum. Complete surgical resection is the mainstay of treatment of these tumors. The staging and histological classification of thymoma is still a matter of discussion. Preoperative computed tomography (CT) scan parameters that correlate with histology, stage and prognosis also still have to be completely assessed. The aim of this study is to evaluate the potential association between clinical, radiologic and pathologic characteristics in patients submitted to surgical treatment for thymoma, assessing their prognostic value. Data of patients submitted to surgical resection for pathologically proven thymoma at our Department of Thoracic Surgery between January 2005 and December 2015 will be retrospectively reviewed. The correlation of preoperative CT scan features, histological and pathological characteristics of thymomas will be evaluated, assessing the prognostic role of these factors.