Portable probe for photoacoustic tomography and real-time photo acoustic tomography device
The present invention relates to a portable probe for photoacoustic tomography, capable of performing line-by-line scanning or area-by-area scanning by using a small number of light inputs; and a real-time photoacoustic tomography device. The probe for photoacoustic tomography includes: a lens receiving light inputs from an optical fiber so as to make the same proceed as small diameter parallel light; a Powell lens receiving the small diameter parallel light and generating a line beam of a predetermined thickness, and allowing energy dispersed on a line to be uniform on the entire line; a lens making the line beam pass therethrough such that the line beam has a predetermined width and a reduced thickness so as to be line-focused at a target area; an acoustic reflection glass for separating, from a light path, an acoustic wave outputted from the target area; and an acoustic measurement unit for measuring acoustic strength.
1. A probe for photoacoustic tomography comprising:
a Powell lens for converting a beam having a circular cross section into a line beam with uniform energy distribution;
a first cylindrical lens and a second cylindrical lens arranged sequentially in a traveling direction of the line beam from the Powell lens so that the line beam has a constant width and a reduced thickness while the line beam passes therethrough the first cylindrical lens and the second cylindrical lens, thereby focusing on a target area; and
an acoustic measurement unit for receiving an acoustic wave outputted from the target area in response to the line beam focused on the target area, wherein the second cylindrical lens is disposed to be rotated at 90 degrees relative to the first cylindrical lens with respect to the central axis of the beam traveling direction.
2. The probe of claim 1 , wherein a convex surface of the first cylindrical lens and a convex surface of the second cylindrical lens face each other.
3. The probe of claim 1 , wherein the Powell lens includes a pair of Powell lenses spaced a predetermined distance apart from each other, line beams generated from each of the pair of Powell lenses are irradiated to the first cylindrical lens in parallel with each other.
4. The probe of claim 1 , wherein each of the first cylindrical lens and the second cylindrical lens has a flat surface on one side thereof and a convex surface on the other side thereof, the first cylindrical lens has the convex surface toward the target area.
5. The probe of claim 1 , further comprising a reflector located at a side of the target area to allow the acoustic wave outputted from the target area to be incident to the acoustic measurement unit.
6. The probe of claim 1 , wherein the second cylindrical lens is a variable focus lens capable of controlling a focusing depth within a tissue, on which the line beam is focused, at the target area.