Intra-oral camera for diagnostic and cosmetic imaging
View Patent ↗An apparatus for obtaining images of a tooth comprises at least one image sensor disposed along an optical axis to take polarized reflectance image and fluorescence image, at least one broadband illumination apparatus for reflectance imaging, and a narrow-band ultraviolet illumination apparatus for fluorescence imaging. In order to remove the specular reflection, one or more polarization elements are disposed along the optical axis. A filter is disposed along the optical axis to block narrow-band ultraviolet light, and a switch for selecting one of the operation modes.
1. An apparatus for obtaining images of a tooth, comprising:
a) at least one image sensor disposed along an optical axis, the image sensor comprising common optical components for both diagnostic and cosmetic imaging;
b) at least one broadband polarized illumination apparatus for reflectance imaging;
c) a narrow-band ultraviolet illumination apparatus for fluorescence imaging;
d) a near IR band polarized illumination apparatus for translucency imaging;
e) one of a blue or UV band polarized illumination apparatus for texture imaging, the polarization orthogonal to polarization of the broad band illumination apparatus and the near IR band illumination apparatus;
f) one or more polarization elements disposed along the optical axis to eliminate specular reflection;
g) a filter disposed along the optical axis to block narrow-band ultraviolet light; and
h) a switch for selecting one of the operation modes of diagnostic imaging using reflectance and fluorescence imaging, and cosmetic imaging using reflectance imaging, translucency imaging, and texture imaging.
2. The apparatus of claim 1 , wherein cosmetic imaging further uses light transmission through the tooth.
3. The apparatus of claim 2 further comprising an attachment for illuminating the occlusal or lingual surface to obtain an image from the transmitted light.
4. The apparatus of claim 3 wherein the attachment comprises a light guide.
5. The apparatus of claim 3 wherein the attachment comprises a light source and a beam-shaping element.
6. The apparatus of claim 5 wherein the light source is a near-infrared light source.
7. The apparatus of claim 1 wherein the broadband illumination apparatus comprises at least one light source with the spectrum from 400 nm to 700 nm.
8. The apparatus of claim 1 wherein the broadband illumination apparatus further comprises one or more beam shaping elements.
9. The apparatus of claim 1 wherein the narrow-band ultraviolet illumination apparatus comprises at least one narrow-band ultraviolet light source with the spectral range of 375 nm to 425 nm.
10. The apparatus of claim 1 wherein the narrow-band ultraviolet illumination apparatus further comprises a bandpass filter to clean the spectrum of the narrow-band ultraviolet light source.
11. The apparatus of claim 1 wherein the polarization element is a polarization beamsplitter.
12. The apparatus of claim 1 wherein the polarization element is a plate polarizer.
13. The apparatus of claim 1 wherein there are two image sensors, further comprising a polarization beam splitter to separate the light with different polarization states to two sensors.
14. The apparatus of claim 1 wherein there are two image sensors, further comprising at least one dichroic mirror to separate the light with different spectral ranges to at least two sensors.