System for brain tissue analysis, said system comprising: - at least one silicon photomultiplier being configured to change from a rest state to an excited state when excited by light, said excited state corresponding to a linear state when the value of the excited state is comprised between a minimum linear value and a maximum linear value; - at least one optical element comprising at least two emitting sources, each emitting source being configured to emit light at a given mean wavelength with full width half maximum at least less than 50% of the mean when the optical element is supplied by an electrical power; - a source of electric voltage in signal communication with the silicon photomultiplier, said source of electric voltage being configured to supply a given electric voltage to the silicon photomultiplier; - a digital control and data elaboration unit in signal communication with the silicon photomultiplier and with the optical element, said digital control and data elaboration unit comprising a control unit configured to define an optical and electrical association between the optical element and the silicon photomultiplier and to define a value of electrical power to be supplied to the optical element, the digital control and data elaboration unit being configured to supply the value of electrical power defined by the control unit to the optical element; - a memory unit in signal communication with the digital control and data elaboration unit, said memory unit having stored the minimum linear value and the maximum linear value of the linear state of the silicon photomultiplier and being configured to store values of electrical power to be supplied to the optical elements; - in which the digital control and data elaboration unit comprises a measuring unit in signal communication with the silicon photomultiplier and with the control unit, said measuring unit being configured to measure a value of the excited state of the silicon photomultiplier; characterized in that: - the control unit is configured to verify if said value of the excited state is comprised between the minimum linear value and the maximum linear value; - the control unit is configured to change the value of electrical power to be supplied to the optical element when the value of the excited state of the silicon photomultiplier, measured by the measuring unit, is lower than the minimum linear value or larger than the maximum linear value; - the control unit is configured to store in the memory unit the value of the electrical power to be supplied to the optical element when the value of the excited state of the silicon photomultiplier, measured by the measuring unit, is comprised between the minimum linear value and the maximum linear value. - at least one silicon photomultiplier being configured to change from a rest state to an excited state when excited by light, said excited state corresponding to a linear state when the value of the excited state is comprised between a minimum linear value and a maximum linear value; - at least one optical element comprising at least two emitting sources, each emitting source being configured to emit light at a given mean wavelength with full width half maximum at least less than 50% of the mean when the optical element is supplied by an electrical power; - a source of electric voltage in signal communication with the silicon photomultiplier, said source of electric voltage being configured to supply a given electric voltage to the silicon photomultiplier; - a digital control and data elaboration unit in signal communication with the silicon photomultiplier and with the optical element, said digital control and data elaboration unit comprising a control unit configured to define an optical and electrical association between the optical element and the silicon photomultiplier and to define a value of electrical power to be supplied to the optical element, the digital control and data elaboration unit being configured to supply the value of electrical power defined by the control unit to the optical element; - a memory unit in signal communication with the digital control and data elaboration unit, said memory unit having stored the minimum linear value and the maximum linear value of the linear state of the silicon photomultiplier and being configured to store values of electrical power to be supplied to the optical elements; - in which the digital control and data elaboration unit comprises a measuring unit in signal communication with the silicon photomultiplier and with the control unit, said measuring unit being configured to measure a value of the excited state of the silicon photomultiplier; - the control unit is configured to verify if said value of the excited state is comprised between the minimum linear value and the maximum linear value; - the control unit is configured to change the value of electrical power to be supplied to the optical element when the value of the excited state of the silicon photomultiplier, measured by the measuring unit, is lower than the minimum linear value or larger than the maximum linear value; - the control unit is configured to store in the memory unit the value of the electrical power to be supplied to the optical element when the value of the excited state of the silicon photomultiplier, measured by the measuring unit, is comprised between the minimum linear value and the maximum linear value.