Scanning endoscope
A scanning endoscope, amenable to both rigid and flexible forms, scans a beam of light across a field-of-view, collects light scattered from the scanned beam, detects the scattered light, and produces an image. The endoscope may comprise one or more bodies housing a controller, light sources, and detectors; and a separable tip housing the scanning mechanism. The light sources may include laser emitters that combine their outputs into a polychromatic beam. Light may be emitted in ultraviolet or infrared wavelengths to produce a hyperspectral image. The detectors may be housed distally or at a proximal location with gathered light being transmitted thereto via optical fibers. A plurality of scanning elements may be combined to produce a stereoscopic image or other imaging modalities. The endoscope may include a lubricant delivery system to ease passage through body cavities and reduce trauma to the patient. The imaging components are especially compact, being comprised in some embodiments of a MEMS scanner and optical fibers, lending themselves to interstitial placement between other tip features such as working channels, irrigation ports, etc.
1. A method for capturing an image, comprising:
creating a beam of light;
scanning the beam of light across a two-dimensional field-of-view at a rate non-constant in both axes;
collecting scattered light with one or more optical fibers; and
detecting light from the field-of-view;
sampling data at a substantially constant rate; and,
interpolating between the sampled data points to produce an image having substantially equal spacing between pixels.
2. The method for capturing an image of claim 1 , wherein said step of scanning the beam of light, further comprises:
scanning along a first scan axis scanned at a first scan frequency; and
scanning along a second scan axis scanned at a second scan frequency;
wherein the second scan frequency is lower than the first scan frequency; and
wherein at least one of said axes is scanned at a sinusoidally varying scan speed.
3. A method for capturing an image, comprising:
creating a beam of light;
scanning the beam of light across a two-dimensional field-of-view at a rate non-constant in both axes, including scanning along a first scan axis scanned at a first scan frequency and scanning along a second scan axis scanned at a second scan frequency, wherein the second scan frequency is lower than the first scan frequency, and wherein at least one of said axes is scanned at a sinusoidally varying scan speed;
collecting scattered light with one or more optical fibers; and
detecting light from the field-of-view;
wherein data is sampled at an instantaneous rate substantially inversely proportional to the instantaneous scan speed along the axis that is scanned at a sinusoidally varying scan speed.
4. The method for capturing an image of claim 3 , wherein the two-dimensional field-of-view is sampled at a frame rate and both of said first and second scan axes are scanned at frequencies higher than the frame rate.
5. The method of claim 4 , wherein the beam is scanned in a Lissajous scan pattern.