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The detection of simulated pulmonary nodules was measured in three different situations that required: (1) reports of all significant chest findings (Free Search), (2) only reports of possible nodules (Nodule Search), or (3) evaluation of particular film locations as nodules (Specified Location). ROC curves from these conditions compared how accurately(More)
The potential of ungated computed tomography (CT) to detect and quantify myocardial infarctions was assessed in 10 dogs. Twenty-seven in vivo CT examinations were performed at various time intervals (1 hr-20 days) after coronary artery occlusion. After intravenous contrast administration, CT delineated the infarcted myocardium in all 27 studies. The(More)
In this department 22% of examinations are interpreted independently by residents outside of normal hours. Staff radiologists review these studies in a process designed to train residents and assure appropriate radiologic consultation. The resident's written reports on 2,619 examinations were analyzed before and after staff review. Each film review session(More)
This study was designed to assess the complications of angiography, including transfemoral, transaxillary, and translumbar approaches. Detailed questionnaires were completed by radiologists at 514 of the 2,066 hospitals surveyed. The radiologists reported on the complications of 118,591 examinations. The overall arteriography complication rates were:(More)
In computed tomography (CT), whole body examinations take 1.5 times as long as head studies. In 73 patients (11 thoracic studies, 25 abdominal examinations, 31 CT scans of abdomen and pelvis, and 6 examinations of pelvis alone), the average time for a CT study was 136 min. The active part of the procedure lasted 60 min. Seventy-six minutes were idle time.(More)
A prospective study of the accuracy of computed tomography (CT) and ultrasound was undertaken in 112 consecutive patients with suspected adrenal disease. CT had a sensitivity of 84% (47/56), a specificity of 98% (55/56), and an accuracy of 90%. Ultrasound had a sensitivity of 79% (22/28), a specificity of 61% (14/23), and an overall accuracy of 70%. When(More)
Selected difficult chest radiographs were interpreted by 10 radiologists and then reread in a Focused Search condition that directed readers' attention to film regions containing frequently omitted findings. The percentage of true abnormalities reported at any level of confidence increased from 49.3 to 68.3 between the usual and Focused Search conditions.(More)
After intravenous administration of contrast agent, in vitro cardiac scanning showed a significant difference between the attenuation coefficients of the intracavitary blood pool and the myocardial wall, permitting clear delineation of the ventricular cavity. A substantial alteration in hematocrit permitted similar visualization of the intracavitary blood(More)
The accuracy and cost of four methods of duplicate reading were evaluated. Eight radiologists interpreted 100 random chest radiographs. Using a third independent interpretation to resolve disagreements between pairs of readers ("Pseudoarbitration") was the most effective method overall, reducing errors 37%, increasing correct interpretations 18%, and adding(More)