The EndoScout tracking system acquires the location and orientation of a sensor during an MRI scan. The sensor is a 3 dimensional magnetic field sensor made by 3 orthogonal pick up coils. According to the clinical application, the sensor comes in different sizes and shapes, to fit the specific application. Two of the most popular ones are the basic cube sensor for hand held guided tool and the micro sensor with about 1.5 mm diameter for small tools, catheters and more.