Measurement of Regional Pulmonary Parenchymal Movement in Dogs.

摘要

A method for measuring regional displacement of the pulmonary parenchyma is described. Metallic markers, 1 mm in diameter, were implanted percutaneously in the lung parenchyma of anesthetized dogs by using an airtight, 28-cm long, 14-gauge thin-walled needle and trocar. A gridlike array of up to 40 markers was obtained throughout the pulmonary parenchyma. True spatial coordinates of the markers were obtained from their coordinates on orthogonal biplane thoracic roentgenograms after correction for distortion caused by X-ray divergence from the source to the film. Pulmonary parenchymal tissue response to these markers was confined to a radius of 100-200 microns, and no pleural adhesions were found in 30 dogs. Accuracy of the method was within a few millimeters. Changes in geomentry of lung parenchyma were determined following spontaneous ventilation and positive-pressure ventilation in anesthetized dogs. (Author)