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CT Technique. (a) CT Thorax obtained in inspiration with the patient supine showing fully inflated normal lungs. (b) CTPA on the same patient acquired at the same time also in the supine position. The CTPA was performed without a breath-hold and is partly in expiration as observed from the bowing of the posterior tracheal membrane (arrow). This, together with IV contrast, increases lung density giving the spurious impression of ground glass opacity.
