[en] Maximum likelihood position estimation of a scintillation event in a gamma-ray imaging detector has been described using two independent one-dimensional estimates in x and y. This approximation is only valid when the sampled light-spread function is separable, and spatial distortion is observed when this constraint is violated. The authors have investigated recursive calculation of the 2-D position estimate using a sequence of one-dimensional estimates. Mean phototube response functions have been computed from Monte Carlo simulations of the light-spread function, and position have been estimated for scintillation events using recursive estimation