نتایج جستجو برای: lesions volume
تعداد نتایج: 476769 فیلتر نتایج به سال:
Estimability index for volume quantification of homogeneous spherical lesions in computed tomography
BACKGROUND AND PURPOSE In the treatment of patients with suspected acute ischemic stroke, increasing evidence suggests the importance of measuring the volume of the irreversibly injured "ischemic core." The gold standard method for doing this in the clinical setting is diffusion-weighted magnetic resonance imaging (DWI), but many authors suggest that maps of regional cerebral blood volume (CBV)...
The cell distribution and the tissue composition of chronic inflammatory periapical lesions were analyzed from seventeen biopsies of root-filled maxillary canines and incisors. The specimens, which included the root tip, the soft granulation tissue, and portions of the surrounding alveolar bone, were subjected to a stereologic analysis based on morphometric point-counting procedures. Plasma cel...
Abstract New parameters such as ablation index (AI) have been developed to create reliable lesions. This study was performed evaluate whether RF energy delivery with the same creates similar lesion volume. Ablation lesions were created in 5 pig hearts at ex-vivo state. using an external-irrigation contact-force sensing catheter on epicardial side of left ventricle 90-degree angle. time adjusted...
Background: One common symptom of diabetes is diabetic retinopathy, if not timely diagnosed and treated, leads to blindness. Retinal image analysis has been currently adopted to diagnose retinopathy. In this study, a model of hierarchical self-organized neural networks has been presented for the detection and classification of retina in diabetic patients. Methods: This study is a retrospective...
BACKGROUND Ventricular tachycardia recurrence can occur after ventricular tachycardia ablation because of incomplete and nontransmural ventricular lesion formation. We sought to compare the lesions made by a novel irrigated needle catheter to conventional radiofrequency lesions. METHODS AND RESULTS Thirteen female sheep (4.6±0.7 years, 54±8 kg) were studied. In 7 sheep, 60-s radiofrequency ap...
BACKGROUND AND PURPOSE The arterial input function (AIF) is critical in determining hemodynamic parameters quantitatively with bolus-tracking MRI. We studied the effect of varying the location of measurement of AIF on the volume of hypoperfusion. We compared the volumes of hypoperfusion obtained with different AIFs with the final ischemic lesion volume. METHODS We included 13 patients with ac...
High concentrations of LDL and other plasma macromolecules are present in normal aortic intima and early proliferative atherosclerotic lesions that have not yet accumulated lipid. Their compartmentalization within the tissue water was estimated from the concentrations of low density lipoprotein (LDL), alpha 2-macroglobulin (alpha 2-M), and albumin in interstitial fluid and adjacent intimal tiss...
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