A two-dimensional detector system for high-resolution thyroid I-131 scintig
raphy was developed. It has a sensitive area of 4 x 4 cm(2) and consists of
a lead collimator and an array of 10 x 10 BGO crystals combined with a pos
ition-sensitive photomultiplier. The spatial resolution and the sensitivity
of the detector have been measured and compared to two commercially availa
ble gamma cameras. The full-width half-maximum for the new system is 3.8 mm
. Furthermore, first patient measurements have been carried out.