In this report, we are following a similar approach. We report on the usage of a different device, which shares the possibility to augment the real-world image with virtual information, visualized on a monitor. The device we present is a Freehand SPECT device, allowing flexible 3D reconstructions of radioactive emissions from the tissue marked by specific tracer substances. The device combines a regular, hand-held radioactive counter, namely a gamma probe, with an optical tracking system. The acquisition is performed in a freehand motion, i.e. without restricted or prescribed hand motion patterns, upon which an approximation of the emitting source is calculated in 3D. Section 2.3 will explain the system in more detail.