Background Previous reports have suggested that hyperlipidemia may be associated with increased restenosis after successful coronary angioplasty. These studies have been compromised, however, by their retrospective nature, the small numbers involved, differences in the definition of restenosis, and inadequate quantitative angiographic follow-up at a prespecified time interval. The objective of ...

The automatic detection of runway hazards from a moving platform under poor visibility conditions is a multifaceted problem. The general approach that we use relies on looking at several frames of the video imagery to determine the presence of objects. Since the platform is in motion during the acquisition of these frames, the first step in the process is to correct for platform motion. Extract...

We have reported the growth pattern of cranium as measured by computed tomography (CT) from birth to 18 years [1] . In the previous report , the CT cranial area was obtained using a built-in cursor and manually tracing the outer edge of the subject's cranial vault. Proper selection of CT slice location and careful tracing provide values that reflect the maximum dimensions of the cranium. To ens...

A novel segmentation algorithm for lungs based on high-resolution computed tomography (HRCT) scan images is developed. This segmentation method is mainly derived from particle swam optimization (PSO) technique to select an appropriate threshold level for pixels-probability density function (P-PDF) that integrates morphological edgedetection technique to refine segmentation. A multi-level thresh...

in order to obtain maximum information from magnetic and gravity anomaly maps, application of an edgedetection method is necessary. in this regard two commonly used methods are derivative filters and local phase filters. in this paper, a matlab code is expanded to combine an analytic signal filter and a tilt angle filter as a new edge detection filter called asta filter. this method was demonst...

Edge detection has been widely used in computer vision and image processing. However, the performance evaluation of the edgedetection results is still a challenging problem. A major dilemma in edge-detection evaluation is the difficulty to balance the objectivity and generality: a general-purpose edge-detection evaluation independent of specific applications is usually not well defined, while a...

evaluation. This task could also lead to new applications, including data compression, robust registration, and effective content based image retrieval in large medical databases. Accurate delineation of tumor can also be helpful for general modeling of pathological brains and the construction of pathological brain atlases Toga et al. (2001). Nevertheless, precise delineation of brain Tumor inM...

Noninvasive Assessment of Subclinical Atherosclerosis in Children and Adolescents To the Editor: Standards relating to the assessment of subclinical atherosclerosis in children are important, especially given the large variation that exists in the “normative” data being published. This variability can, at least in part, be ascribed to variability and inconsistency in the application of the tech...

N ew developments in transducer technology and signal analysis have increased the applicability of intracoronary Doppler ultrasonography for the measurement of coronary blood flow velocity. Intracoronary Doppler guide wires are used to estimate the severity of intermediate lesions,’ to define the functional results of coronary interventions,2 and to study coronary flow changes after pharmacolog...

To the Editor: Chronic hypertension is associated with arterial endothelial dysfunction, the precursor to atherosclerosis (1); however, less is known about the effects of brief episodes of hypertension on endothelial function. Lamping and Dole (2) demonstrated that 5 min of moderate elevations in perfusion pressure reduces conduit coronary arterial endothelial function for up to 2.5 h. This end...