-  Use gammacamera with paralell high resolution collimator for imaging.

-  Inmediately after injection obtain a dynamic study 1 frame/30 sec for 15 min or a sequence of static views.

-  If no or partial spontaneous flow is noted, then press the pumping device mildly to characterize patency.

Thom AF et al. Medicina Nuclear en la Hidrocefalia del Adulto, p: 491-497 in: Medicina Nuclear Aplicaciones Clínicas. Eds: I. Carrio - P. González. Editorial Masson, Barcelona España, 2003.