A system and method are presented for use in monitoring one or more conditions of a subject's body. The system comprises a control unit which comprises an input port for receiving image data, a memory utility, and a processor utility. The image data is indicative of data measured by a pixel detector array and is in the form of a sequence of speckle patterns generated by a portion of the subject's body in response to illumination thereof by coherent light according to a certain sampling time pattern. The memory utility stores one or more predetermined models, the model comprising data indicative of a relation between one or more measurable parameters and one or more conditions of the subject's body. The processor utility is configured and operable for carrying out the following: processing the image data and determining a spatial correlation function between successive speckle patterns in the sequence, and determining a time varying spatial correlation function in the form of a time-varying function of at least one feature of the correlation function, the time-varying spatial correlation function being indicative of a change of the speckle pattern over time； selecting at least one parameter of the time-varying spatial correlation function, and applying to said at least one parameter one or more of the models to determine one or more corresponding body conditions； and generating output data indicative of said one or more corresponding body conditions.La présente invention concerne un système et un procédé destiné à être utilisé pour la surveillance d'une ou plusieurs conditions du corps d'un sujet. Le système comprend une unité de commande qui comprend un orifice d'entrée destiné à recevoir des données d'image, un utilitaire de mémoire, et un utilitaire de processeur. Les données d'image sont une indication des données mesurées par un réseau de détecteurs de pixels et se trouvent sous la forme d'une séquence de figures de speckle générées par une partie du corps du su
