PT Journal
AU Grkovski, M
   Brzezinski, K
   Cindro, V
   Clinthorne, NH
   Kagan, H
   Lacasta, C
   Mikuz, M
   Solaz, C
   Studen, A
   Weilhammer, P
   Zontar, D
TI Evaluation of a high resolution silicon PET insert module
SO Nuclear Instruments & Methods in Physics Research A
JI Nucl. Instrum. Methods Phys. Res. A
PY 2015
BP 86
EP 94
VL 788
DI 10.1016/j.nima.2015.03.078
LA English
DE Positron emission tomography; Silicon detectors; PET insert; Image reconstruction
AB Conventional PET systems can be augmented with additional detectors placed in close proximity of the region of interest. We developed a high resolution PET insert module to evaluate the added benefit of such a combination. The insert module consists of two back-to-back 1 mm thick silicon sensors, each segmented into 1040 1 mm(2) pads arranged in a 40 by 26 array. A set of 16 VATAGP7.1 ASICs and a custom assembled data acquisition board were used to read out the signal from the insert module. Data were acquired in slice (20) geometry with a Jaszczak phantom (rod diameters of 12-4.8 mm) Filled with F-18-FDG and the images were reconstructed with ML-EM method. Both data with full and limited angular coverage from the insert module were considered and three types of coincidence events were combined. The ratio of high-resolution data that substantially improves quality of the reconstructed image for the region near the surface of the insert module was estimated to be about 4%. Results from our previous studies suggest that such ratio could be achieved at a moderate technological expense by using an equivalent of two insert modules (an effective sensor thickness of 4 mm).
ER