Material and Methods
We have experimentally measured the limits of
detectability using a set of hollow spheres in a Jaszczak
phantom at various T/B ratios. Imaging modalities for this
work were (1) planar imaging with conventional gamma
camera, (2) SPECT, (3) PET, and (4) planar imaging with a
camera which has coincidence detection capability. General
characteristics of these imaging modalities will be presented
below briefly.
(1) Planar camera provides a high count image of the
patient from a single angle, e.g., a typical count rate of 178
cpm/μCi of 99mTc with the low energy high resolution