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Comparison between CT angiography and perfusion blood volume (PBV) images before and after thrombolytic therapy in an 82-year-old pulmonary embolism patient. (a, c) Volume rendering technique images show that the emboli have almost disappeared after thrombolytic therapy, whereas PBV (b, d) images show that although there is improved perfusion in the right middle and left lingual lobe, the perfusion of other lobes are aggravated.
