Abstract: Apparatus, systems and methods for measuring changes in the volume of a tissue of a person are described herein. The methods include applying a first marker to a portion of a tissue, the first marker having a pattern of markings thereon, each marking of the pattern of markings having an initial position; capturing an image of the pattern of markings at a first time after applying the first marker to the tissue, at least one marking of the pattern of markings having a subsequent position at the first time when the image is captured; determining a change of position of the at least one marking by comparing the subsequent position of the at least one marking in the captured image to the initial position of the at least one marking; and based on the change of position of the at least one marking, determining the physiological measurement of the tissue.

Abstract: In the present invention there is a provided an array of radiation detectors comprising at least one detector capable of detecting both low and high energy gamma radiation and adapted to provide spectrometric identification of the gamma source; at least one detector capable of detecting and providing spectrometric identification of fast neutrons and low resolution gamma spectra; at least one detector adapted to detect thermal neutrons; and, at least one plastic scintillator to give enhanced gamma ray sensitivity.