| 主权项 |
1. A method for locating a target blood vessel of a target size for imaging within a small field of view, the method comprising:
illuminating at least a first sub-region of a region including at least a portion of the target blood vessel with illuminating light comprising a background light component having a substantially high susceptibility to absorption by particles in said portion of the vessel; detecting returned or emitted light from said illuminated sub-region; reproducing at least one image from said returned or emitted light; identifying higher-absorbing regions within said reproduced image; moving the illumination to a second or further sub-region when a higher-absorbing region corresponding to said portion of the vessel is not so-identified; and iteratively applying said steps of illuminating, detecting, reproducing—, identifying, and moving, until said higher-absorbing region is identified wherein: first or said second or further sub-region is small enough that it has at least a 50% chance of not including a target blood vessel of said target size. |
