An array of force sensors for determining a position of an object, detecting motion of object, and tracking motion of objects in 3D space are described herein. In particular, an array of force sensors can be used to monitor anatomical motion during medical procedures, such as head motion during cranial radiosurgery, to maintain a desired alignment with the anatomical feature. Alerts can be posted to the medical machine operator and the radiosurgery system or scanner can make compensatory adjustments to maintain the desired alignment either after suspension of treatment or dynamically during treatment. Methods of detecting a position, movement or tracking motion of an anatomical feature are also provided herein.
