الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Pulmonary embolism (PE) is a common condition with considerable morbidity and mortality; it is more often diagnosed postmortem by pathologists than in vivo by clinicians. Prompt and accurate diagnosis is difficult because PE may be clinically silent, the symptoms are vague and nonspecific, and in addition there is no definitive, non-invasive diagnostic test to establish its diagnosis.The advent of chest CT scanning for the diagnosis of pulmonary embolism was hailed as an improvement, even before recent studies were undertaken.by 2001,CT scanning was being used more often scanning to investigate suspected pulmonary embolism. There are now multiple generations of CT scanners, but even first generation machines delivered images that were dramatic in clarity, rapidly acquired, and accurate in delineating the proximal pulmonary arterial tree. This noninvasive technology has evolved rapidly. A 16-slice multidetector-row CT scanner can image the entire chest with sub millimeter resolution and requires a breath-hold of less than 10 seconds.