Fig. 1From: Evaluation of two intraoperative gamma detectors for assessment of 177Lu activity concentration in vivoSchematic view of the geometrical crystal and collimator design of the two detectors. For detector A, information from the manufacturer about the distance from the crystal to the distal end of the collimator was not available, indicated by the question mark and the arrow inside the CsI(Tl) crystal. Note that only the tips of the two detectors are shownBack to article page