PHYSIOLOGICAL EFFECTS OF AN “OPEN LUNG” VENTILATORY ...

The x-ray attenuation of each voxel, expressed in “CT numbers” or Hounsfield units (HU), was obtained by determining the percentage of radiation adsorbed by that voxel. The attenuation scale arbitrarily assigns to bone a value of 1000 HU (complete absorption), to air a value of -1000 HU (no absorption) and to water a value of 0 HU; blood ... ................
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