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Coronary Computed Tomography Angiography (CCTA) has gained substantial ground in everyday clinical practice due to its non-invasive nature. In this work we present a noninvasive method to assess the hemodynamic significance of coronary stenoses using only CCTA images. Two female patients were subjected to Invasive Coronary Angiography, Virtual Histology IVUS and CCTA. The same arterial segment was...
The registration of preoperative 3D to intraoperative 2D images plays a crucial role in percutaneous coronary intervention. This technique reduces uncertainty regarding vessel topology and depth information in 2D intraoperative images. The aim of 2D/3D image registration is to determine the most appropriate image alignment. However, 2D/3D registration of heart images is challenging, due to differences...
We have proposed a minimum path based method to extract 3-D coronary vessels, named minimum path based region growing (MP-RG). The MP-RG approach is based on the high convexity of vascular profiles, and is rather inefficient in discriminating vessel structures and other high-contrast structures. In this paper, orientated profile symmetry information is combined with profile convexity information in...
A method for registering preoperative coronary CTA with intraoperative monoplane X-ray angiography images is proposed to improve image guidance during minimally invasive coronary interventions. The method uses a patient-specific dynamic coronary model, which is derived from the CTA scan by centerline extraction and motion estimation. The dynamic coronary model is...
Stent implantation alters coronary artery hemodynamic and wall shear stress during cardiac cycles. In this study, three dimensional models were used to analyze the effects of different stent designs and strut thicknesses on the hemodynamic of the artery. The flow was assumed to be pulsatile and stent models were expanded in the artery the same as angioplasty procedure that uses balloon. The data was...
Generally, it is difficult to visually inspect the stenos is from angiographic projections during the diagnosis of coronary artery disease. However, 3D reconstruction methods can effectively remedy the shortage of angiographic imaging technique, which can recover coronary arteries in the 3D space from limited projections. For the 3D reconstruction technique, correspondence matching is the key to determine...
In contrast to other ultrasound-based strain imaging techniques, Myocardial Elastography (ME), developed by our group, is an ultrasound radio-frequency (RF)-based speckle tracking technique that aims at estimating and mapping transmural displacements and angle-independent strains in full echocardiographic views at high precision and high spatial and temporal resolution. ME has previously been evaluated...
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