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BACKGROUND Perfusion imaging techniques intended to identify regional limitations in coronary flow reserve in viable myocardium need to identify 2-fold differences in regional flow during coronary vasodilation consistently. This study evaluated the suitability of current first-pass magnetic resonance approaches for evaluating such differences, which are 1(More)
RATIONALE Alterations in the activity of the prefrontal and orbitofrontal cortices of cocaine addicts have been linked with re-exposure to cocaine-associated stimuli. OBJECTIVES Using an animal model of relapse to cocaine seeking, the present study investigated the expression patterns of four different activity-regulated genes within prefrontal cortical(More)
An overview of the forms of partial anomalous pulmonary venous connections (PAPVC) and a discussion of the role of computed tomography (CT) in diagnosing this anomaly are offered. Although angiography remains the most sensitive technique for detection of anomalous pulmonary veins and other cardiac anomalies, the increased use of CT over the past decade has(More)
PURPOSE To determine the sensitivity and specificity of helical computed tomography (CT) for the diagnosis of acute pulmonary embolism. MATERIALS AND METHODS This prospective study included 47 patients who underwent pulmonary arteriography for evaluation for possible acute pulmonary embolism. Tailored helical CT and pulmonary arteriography were performed(More)
Four experienced coronary angiographers (two radiologists and two cardiologists) independently assessed the location and degree of coronary artery stenosis, and the location and degree of left ventricular wall motion abnormalities in 20 coronary angiograms. Marked interobserver variability was noted in quantifying percent coronary artery stenosis and degree(More)
OBJECTIVE The purpose of this study was to prospectively assess the usefulness of the routine addition of an automated biopsy device (ABD) to fine-needle aspiration (FNA) of the lung and to examine the complication rate of this procedure. SUBJECTS AND METHODS Fifty biopsies were performed under CT guidance using a coaxial technique with a 19-gauge(More)
The capacity of computerized tomography to assess myocardial edema resulting from acute coronary occlusion was investigated in 19 arrested and 2 beating canine hearts. Edematous myocardium was consistently detected as areas of decreased attenuation values. The magnitude of the decrease in attenuation value was linearly related to the severity of the edema.(More)
A scoring system was devised for the assessment of coronary artery calcifications apparent on computed tomographic (CT) scans, with width and length used to assess severity. The degree of calcification was compared with the presence of stenoses of 70% or greater at cardiac catheterization in 46 patients who underwent both studies. Although many(More)
To compare the accuracy of interpretation of digitized radiographs with that of plain films, the authors prospectively evaluated the first 685 plain film cases (530 adult and 155 pediatric cases, each of which consisted of one or more images) transmitted from an outpatient center 18 miles (approximately 29 km) to a hospital radiology department by means of(More)