Compact low-cost fiberless diffuse speckle contrast flow-oximeter

A probe for use in measuring at least one hemodynamic parameter within a tissue of a subject, said probe comprising:

• a first laser diode adapted for emitting light into the tissue of the subject at a first wavelength;
• a second laser diode adapted for emitting light into the tissue of the subject at a second wavelength different from the first wavelength;
• a bare imaging device adapted to contact the tissue of the subject and receive light reflected from the tissue to detect diffuse speckle contrast variations in the tissue for measurement of the at least one hemodynamic parameter;
• and
• a retainer adapted to receive and maintain a constant distance from each of the first laser diode and the second laser diode to the bare imaging device, said retainer including a contact surface adapted to contact the tissue of the subject;
• wherein the retainer is adapted to maintain the bare imaging device in contact with the tissue with no lens therebetween.

A method of measuring at least one hemodynamic parameter within a tissue of a subject, said method comprising:

• emitting light at a first wavelength from a first laser diode into the tissue, said light not received through an optical cable;
• placing a bare imaging device in contact with the tissue with no lens therebetween;
• and
• measuring reflected light from the tissue to detect diffuse speckle contrast variations in the tissue in order to measure the at least one hemodynamic parameter.