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The coronal and sagittal diameters of the tracheal air column were measured on posteroanterior and lateral chest radiographs of 808 patients with no clinical or radiographic evidence of respiratory disease. The 430 male and 378 female subjects were 10-79 years of age. Assuming a normative range that encompasses three standard deviations from the mean or(More)
A modified receiver operating characteristic (ROC) study was performed in which five readers were asked to locate multiple nodules on images of an anthropomorphic phantom obtained with a prototype digital radiographic chest unit and with a conventional chest unit. Results indicate that when nodules were projected over the lungs, a significantly greater(More)
During the past several years, image acquisition in nuclear medicine, computed tomography, ultrasonography, subtraction angiography, and magnetic resonance has been by digitization. Despite these advances, research in the development of digital imaging in conventional radiography has lagged behind. Although studies with a variety of digital techniques have(More)
Seventeen intravenous abusers of methadone underwent clinical, roentgenologic and physiologic assessment. Two complained of dyspnea on exertion and two had cor pulmonale. Of 15 patients whose fundi were examined, nine had talc particles in their retinal vessels. The chest roentgenograms of seven showed a diffuse pin-point micronodular pattern and two of the(More)
The authors undertook a clinical study to determine the accuracy of dual-energy digital radiography in revealing nodule calcification because calcification in a pulmonary nodule almost excludes the possibility of malignancy. Over a 6-month period, 61 patients with pulmonary nodules (less than or equal to 3 cm) or masses (greater than 3 cm) were examined on(More)
A prototype digital unit dedicated to chest radiography was used to examine 50 selected patients for a comparison study of the capability of digital images and conventional chest radiographs to reveal normal anatomic structures and a variety of pathologic states. The images in both modes were submitted for interpretation to seven experienced radiologists(More)
Metastatic calcification of the lung and heart can cause severe cardiopulmonary compromise and death. Although it is found in most end-stage renal disease patients at autopsy, it is only rarely detected during life. Using a prototype dual-energy digital chest radiographic unit, we measured calcium content (mg/cm2) over the lung and heart in 32 hemodialysis(More)
The presence or absence of calcium in solitary pulmonary nodules may indicate whether a nodule is benign or malignant. Because current techniques for measuring the amount of calcium in these nodules are unsatisfactory, a study was carried out to assess the capability of dual-energy digital chest radiography to identify and quantify the calcium content of(More)