The GEMPix is a small gaseous detector with highly pixelated readout, consisting of drift region, three Gas Electron Multipliers (GEMs) for signal amplification, and four Timepix ASICs 55 µm pixel pitch total 262,144 pixels. A continuous flow gas mixture such as Ar:CO2:CF4, Ar:CO2 or propane-based tissue equivalent supplied externally at rate 5 L/h. This article reviews the medical applications...