Position-sensitive SiPMs are useful in all light detection applications requiring a small number of readout channels while preserving the information about the incoming light’s interaction position. Focusing on a 2 × 2 array of LG-SiPMs covering an area of ∼ 15.5 × 15.5 mm² with just 6 readout channels, we proposed a quantitative method to evaluate the image reconstruction performance. The method is based on a statistical approach to assess the device’s precision (spatial resolution) and accuracy (linearity) in reconstructing the light spot center of gravity. This evaluation is achieved through a Rice probability distribution function fitting. We obtained an average sensor spatial resolution of 81 ± 3 μm (standard deviation) with a corresponding accuracy of 231 ± 4 μm.