Figure 15.

Simulated 10-min images resulting from changing the lesion's size or position. All images were acquired using the default conical slant-hole collimator parameters. (a) The lesion diameter was decreased from 1 to 0.75 cm. Count sensitivity, error in calculated depth, and FWHM of the circumferential profile were unaffected by this change. (b) The lesion depth was changed from 3 to 2 cm. Error in calculated depth was increased from 0.5 to 2.2 mm with this change; sensitivity and FWHM were unaffected. (c) The lesion was offset 5 mm from the center of the conical slant-hole collimator. Error in calculated depth was increased from 0.5 to 5.6 mm and FWHM was increased from 2.0 to 3.4 cm.