A fluorescence endoscopy video system includes a multimode light source that produces light for color and fluorescence imaging modes. Light from the light source is transmitted through an endoscope to the tissue under observation. The system also includes a compact camera for color and fluorescence imaging. Images obtained through the endoscope are optically divided and projected onto one or more image sensors by a fixed beam splitter in the camera. The fixed beam splitter eliminates the need for inserting a movable mirror into the light path between the endoscope and the image sensors. Image signals from the camera are processed in the system processor/controller where a contrast enhancement function can be applied. The contrast enhancement function increases the color contrast between normal tissue and tissue suspicious for early cancer. Finally, the system also includes a calibration feature whereby the system performance can be maintained when used with different endoscopes.

Compact fluorescence endoscopy video system

A fluorescence endoscopy video system includes a multi-mode light source that produces light for white light and fluorescence imaging modes. Light from the light source is transmitted through an endoscope to the tissue under observation. The system also includes a compact camera for white light and fluorescence imaging, which may be located in the insertion portion of the endoscope, or attached to the portion of the endoscope outside the body. The camera can be utilized for both white light imaging and fluorescence imaging, and in its most compact form, contains no moving parts.

Fluorescence endoscopy video systems with no moving parts in the camera

An endoscopic video system and method using a camera with a single color image sensor, for example a CCD color image sensor, for fluorescence and color imaging and for simultaneously displaying the images acquired in these imaging modes at video rates in real time is disclosed. The tissue under investigation is illuminated continuously with fluorescence excitation light and is further illuminated periodically using visible light outside of the fluorescence excitation wavelength range. The illumination sources may be conventional lamps using filters and shutters, or may include light-emitting diodes mounted at the distal tip of the endoscope.

Imaging system with a single color image sensor for simultaneous fluorescence and color video endoscopy

An imaging system for acquisition of NIR and full-color images includes a light source providing visible light and NIR light to an area under observation, such as living tissue, a camera having one or more image sensors configured to separately detect blue reflectance light, green reflectance light, and combined red reflectance light/detected NIR light returned from the area under observation. A controller in signal communication with the light source and the camera is configured to control the light source to continuously illuminate area under observation with temporally continuous blue/green illumination light and with red illumination light and NIR excitation light. At least one of the red illumination light and NIR excitation light are switched on and off periodically in synchronism with the acquisition of red and NIR light images in the camera.

Imaging system for combined full-color reflectance and near-infrared imaging

A fluorescence endoscopy video system includes a multi-mode light source that produces light for white light and fluorescence imaging modes. A filter is positioned at the distal end of an imaging endoscope so that the endoscope can produce fluorescence and white light images of a tissue sample.

Filter for use with imaging endoscopes

A signal having a maximum amplitude corresponding to a pedestal level of a composite video signal is produced by removing a horizontal synchronizing signal from the composite video signal. An automatic gain control signal is derived from the first mentioned signal in dependence of the peak value thereof to control a high frequency amplifier and or an intermediate frequency amplifier so that the pedestal portion at the maximum amplitude level of the composite video signal is maintained constant. In this way, a stabilized pedestal portion or the black level can be attained, which in turn results in a stabilized contrast.

Automatic gain control circuit

A high voltage regulation circuit for a color television receiver comprising a horizontal deflection yoke, a high voltage circuit and a variable inductance element connected in parallel with said horizontal deflection yoke, thereby controlling the inductance of said variable inductance element in response to the variation of a high voltage of the high voltage circuit.

High-voltage regulation circuit for a color television receiver

A high voltage generator suitable for use in a television receiver set wherein a frequency dependent attenuation circuit is connected to a primary winding of a flyback transformer which generates a high voltage to be supplied to a CRT whereby a regulation for a high voltage is improved

High voltage generator

Electron beam deflection device for use in connection with cathode-ray tubes of television receivers and the like

The present invention relates to a deflection yoke device which is preferably combined with an in-line type color picture tube having electron guns aligned horizontally The distribution of magnetic fields is determined in the horizontal direction such that a sharp or strong barrel magnetic field is localized on the side of the neck portion whereas an extremely sharp pincushion magnetic field is localized on the side of the funnel portion and at the same time, an intensely sharp pincushion magnetic field is distributed between the funnel portion and the neck portion The central electron beam is deflected more at a greater angle than side electron beams so as to land outside the side electron beams

Mitsuharu Akatsu

Papers

Automatic gain control circuit

High-voltage regulation circuit for a color television receiver

High voltage generator

Electron beam deflection device for use in connection with cathode-ray tubes of television receivers and the like

Deflection yoke device for use in color television receiver sets