… The goal of this study was to measure regional pulmonary perfusion using SPECT and
transmission tomography for attenuation correction and density measurements. Methods:
Regional … As in our study, the lung was delineated by a thresholding procedure using a
density study. In the most dorsal part of the lung the value of the perfusion gradient was
higher than our results, possibly because perfusion was calculated from measured
ventilation and ventilation/perfusion-ratios. Attenuation corrected SPECT images of …