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. 2013 Sep 11;8(9):e74991. doi: 10.1371/journal.pone.0074991

Figure 2. Definition of regions of interest (ROI’s) in lateral gamma camera images.

Figure 2

Superposition of the lateral gamma camera image with a representative sagittal CT slice in a healthy volunteer and definition of the different ROI’s: total nasal (TN), anterior upper (AU: frontal sinuses), anterior lower (AL: nostrils, nasal valve and first cm of inferior turbinate), posterior lower (PL: turbinates, nasal floor, hard and soft palate), and posterior upper (PU: upper posterior nasal cavity, middle turbinate, ethmoidal and sphenoidal sinuses), and sphenoidal sinuses (SS).