The first picture is the raw image from the 2 X 2 array of H8500's coupled to a 66 x 66 NaI(Tl) scintillating crystal array comprised of 1.3mm x 1.3mm x 6mm crystals separated by a 0.2mm layer of light-opaque epoxy/alumina powder mixture. After a position and energy calibration procedure, a pinhole SPECT image of a microSPECT Phantom was acquired and the second picture shows a transaxial slice through this image. The phantom consists of a series of holes from 1.2mm to 1.7mm with center-to-center spacing equal to twice the hole diameter filled with Tc-99m.  A tungsten pinhole collimator was used resulting in a magnification factor of ~3.  The intrinsic spatial resolution is approximately 1.7mm across the detector with a 19% energy resolution at 140keV.

The first picture is the raw image from a 4 X 5 array of H8500's coupled to a 114 x 91 NaI(Tl) scintillating crystal array comprised of 1.946mm x 1.946mm x 6mm crystals separated by a 0.254mm layer of light-opaque epoxy/alumina powder mixture. The overall active area of the detector is ~250mm x 200mm. The second picture shows a sideview drawing of the detector where the thickness is less than 8.5cm including the 2cm thick collimator.  The intrinsic spatial resolution is approximately 2.3mm across the detector with a 10.8% energy resolution at 140keV.