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Quantitative Assessment of the Influence of Location, Internal Temperature, Idle Time, and Normalization on the Sensitivity of a Mobile PET/CT Scanner

Phoebe Putney Memorial Hospital, Albany, Georgia

View larger version (24K): [in this window] [in a new window]   FIGURE 1.  Slice concentrations (Bq/mL) extracted from reconstructed images of data acquired with mobile PET/CT scanner on 2-bed-frame cylindric phantom at 4 random community hospitals. Slice concentrations from 4 locations demonstrated similar pattern, with center slices of scanner exhibiting better homogeneity.

View larger version (12K): [in this window] [in a new window]   FIGURE 2.  Average sensitivity errors of Reveal RT Mobile PET/CT scanner, obtained over 19 consecutive mo, on day 1 and day 2, at our community health care center. Minor improvement is noticeable in average sensitivity of scanner on day 2.

View larger version (18K): [in this window] [in a new window]   FIGURE 3.  Increase in internal temperature resulted in significant and nonuniform decrease in slice sensitivity of scanner.

View larger version (18K): [in this window] [in a new window]   FIGURE 4.  Normalization improved sensitivity of mobile PET/CT scanner significantly, particularly at edges of field of view. norm = normalization.