Canadian Association of Radiologists journal = Journal l'Association canadienne des radiologistes
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Inferior vena cavae (IVC) can be of unusual geometry, often having odd shapes and being oriented (in long axes) away from the horizontal plane. However, after insertion of a filter, most IVC adopt a circular cross-section. The objective of this study was to determine if the IVC diameter estimated by frontal measurement (cavogram equivalent) reflects the true circular diameter of the infrarenal vena cava. Diameter estimation is clinically important in the correct selection of a filter, because mega cavae (diameter 28 mm or greater) require a particular filter. ⋯ Cavograms can over- or underestimate the true diameter of an IVC, and may thus lead to incorrect filter choice. It is recommended that a sonogram or CT scan be obtained to visualize the IVC in cases of suspected mega cava, and that true circular diameters be used for selection and placement of IVC filters.
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Apheresis is an important technique, used increasingly for a variety of conditions. It is sometimes performed via peripheral access because of concern over major complications associated with central venous catheter (CVC) placement. This study was to determine the safety and success of radiologic placement of CVCs for apheresis. ⋯ CVCs are safe for apheresis if real-time sonographic guidance is used for the puncture, guide wire and catheter placement are confirmed fluoroscopically, and the duration of catheterization is short.
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Comparative Study
Comparison of digital angiographic images with conventional radiographs for detection of pneumothorax after needle biopsy of lung.
To compare the rate of detection of pneumothoraces from images obtained from a digital angiographic system (1024 x 1024 matrix) and from conventional film-screen chest radiographs, following fine-needle biopsy of the lung. ⋯ The detection of pneumothorax from digital images was far inferior to that from standard film-screen chest radiographs. Therefore, standard chest radiographs are recommended after fine-needle biopsy of the lung.