نتایج جستجو برای: ray angiography
تعداد نتایج: 339834 فیلتر نتایج به سال:
BACKGROUND The use of coronary MR angiography (CMRA) in patients with coronary artery disease (CAD) remains limited due to the long scan times, unpredictable and often non-diagnostic image quality secondary to respiratory motion artifacts. The purpose of this study was to evaluate CMRA with image-based respiratory navigation (iNAV CMRA) and compare it to gold standard invasive x-ray coronary an...
Background—Persistent intracoronary thrombus after plaque rupture is associated with an increased risk of subsequent myocardial infarction and mortality. Coronary thrombus is usually visualized invasively by x-ray coronary angiography. Non–contrast-enhanced T1-weighted magnetic resonance (MR) imaging has been useful for direct imaging of carotid thrombus and intraplaque hemorrhage by taking adv...
A method for registering preoperative 3D+t coronary CTA with intraoperative monoplane 2D+t 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 registered with the 2...
Introduction Selective arterial angiographic information is conventionally achieved using x-ray based digital subtraction angiography (DSA), in which radio-opaque contrast agent is injected under x-ray guidance via a catheter. These x-ray DSA methods are invasive, labor intensive, and carry risks to the patient, most significantly a risk of stroke. For these reasons the valuable dynamic flow in...
Cineangiographic axial techniques were designed to overcome the limitations of conventional angiography in the diagnosis of congenital heart disease. Two basic patient (or equipment) maneuvers are involved; 1) long axis of the heart is aligned perpendicular to the X-ray beam, and 2) rotation of patient results in the heart being radiographically sectioned at 300 angles. To accomplish this with ...
Visualization of blood vessels for diagnostic and therapeutical purposes is one of the standard procedures in radiological practice. In conventional angiography, a contrast agent is injected into a patient’s artery or vein, and its distribution is shown on two-dimensional X-ray projections. This method is well-suited for the investigation of a wide variety of disorders, but problems such as X-r...
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