Abstract
For intraoperative medical imaging, the development of small field of view (SFOV) hybrid gamma cameras is an expanding area of research. The performance characteristics of a new innovation combining both gamma and optical imaging in a co-aligned configuration, the Hybrid Gamma Camera (HGC) have been evaluated and compared. In this study the HGC was fitted with either 1500 mu m thick columnar CsI:TI or 1500 rim thick pixelated GOS scintillators.
The columnar CsI:TI scintillator has an intrinsic spatial resolution of 230 um compared to 1090 pm for the pixelated GOS scintillator. The sensitivity at 140.5 keV of the Csl:TI was 40 %, however, for the COS it was 54 %. The intrinsic spatial uniformity was comparable for both Csl:TI and GOS scintillators. There was a significant difference between the Csl:TI and GOS scintillators for count rate capability which was lower when using a GOS scintillator.