A system for illuminating a surgical field comprises a surgical imaging element and an illumination element. The surgical imaging element images the surgical field and has an image axis. The illumination element or the imaging element may be moved independently of the other in order to control illumination or field of view.

Non-telecentric in image space optical objective dimensioned to operate as part of intravascular endoscope probe and including first and second groups of lens elements (separated by an aperture stop) each of which has negative optical power. The first group of lens elements includes a first meniscus lens with a positive dioptric power and a first optical doublet. The second group of lens elements includes a sequence of second and third optical doublets and a second meniscus lens that follows the third optical doublet. At least one of the first and second groups of lens elements includes an aspheric refractive surface, thereby reducing distortion down to under 0.25% for field angles up to at least 40 degrees.

An apparatus for providing a light output to an optical guide for illumination of an imaged object including a plurality of solid state light-emitting sources each of which are independently powered and independently controlled, each light-emitting source emitting light at a wavelength which is different from the wavelength emitted by the other light-emitting sources. The apparatus also includes a heat sink configured to thermally couple the plurality of solid state light-emitting sources and provide conduction of heat generated by the plurality of solid state light-emitting sources. The apparatus further includes an optical elements to collect, collimate, and combine the emissions from the plurality of solid state light-emitting sources into a combined beam of light to be optically coupled to the light guide.

An imaging device includes: an imaging sensor; a color filter including first band filters and a second band filter configured to transmit narrowband light having a maximum value of a transmission spectrum outside a range of the wavelength band of the light that passes through each first band filter; a first light source unit; a second light source unit configured to radiate light having an upward projecting distribution of a wavelength spectrum in relation to intensity and having a narrowband light spectrum narrower than the broadband; and a control unit configured to cause the first light source unit and the second light source unit to radiate the beams of light simultaneously, wherein a peak wavelength of the light radiated by the second light source unit is an infrared region or a near-infrared region.

A light emitting device includes a light source that emits a primary light having a light energy density exceeding 0.5W/mm.sup.2, and a first phosphor that absorbs the primary light to convert the primary light into a first wavelength-converted light having a wavelength longer than that of the primary light. The first phosphor includes a compound serving as a host, the compound being a simple oxide including one kind of metal element or a composite oxide including a plurality of different kinds of the simple oxide as an end member. When an energy conversion value at a peak wavelength of the primary light is E1 electron volts and an energy conversion value at a fluorescence peak wavelength of the first wavelength-converted light is E2 electron volts, a bandgap energy of a crystal of the simple oxide is larger than a sum of the E1 electron volts and the E2 electron volts.

A medical imaging system is described that comprises an heating element configured to apply at least one heating pattern element to a material to locally heat the material; a sensor configured to capture the position of the heated material a predetermined time after the application of the heating pattern element; and circuitry configured to determine the change of the heating pattern applied to the material based upon the captured position of the heated material after the predetermined time.

A module accommodates multiple superluminescent light emitting diodes, SLEDs, 12r, 12g and 12b. The SLEDs are arranged in an enclosure and output respective light beams to propagate into free space within the enclosure. The individual light beams from the SLED sources are combined into a single beam path within the enclosure using beam combiners 40r-g, 40rg-b. Each beam combiner is realized as a planar optical element, the back side of which is arranged to receive a SLED beam and route it through the optical element to the front side where it is combined with another SLED beam that is incident on and reflected by the front side. The free-space propagating combined beam is output from the module via an optical fiber 42 (or through a window).

A method of analysing a target bodily tissue of a subject. The method involves manipulating image data from the target bodily tissue and a background bodily tissue after dosing the subject with a contrast agent. The relative intensities of the light emitted from selected areas of the target bodily tissue and background bodily tissue at different time points after dosing are compared to determine whether 1) the intensity of light emitted from the target bodily tissue is lower than the intensity of light emitted from the background bodily tissue during the first part of the time period; and/or 2) the intensity of light emitted from the target bodily tissue is higher than the intensity of light emitted from the background bodily tissue during the second part of the time period; to assist in the determination of whether the target bodily tissue is benign or malignant.

To enable tunable wavelength extraction and detection of a narrow band, while maintaining resolution.

Provided is a signal processing device including: an acquisition unit that acquires a signal of a first wavelength band in which wavelength extraction is possible in a tunable manner by means of postprocessing and a signal of a second wavelength band to be used for a special purpose; and a signal processing unit that performs signal processing using the signal of the first wavelength band and the signal of the second wavelength band.

A light emitting device includes a light source configured to emit a primary light, a first phosphor that absorbs the primary light and converts the primary light into a first wavelength-converted light having a wavelength longer than that of the primary light, and a second phosphor that absorbs the primary light and converts the primary light into a second wavelength-converted light having a wavelength longer than that of the primary light. The first wavelength-converted light is a fluorescence having a light component over an entire wavelength range of 700 nm or more to 800 nm or less. The second wavelength-converted light is a fluorescence having a peak where a fluorescence intensity shows a maximum value in a wavelength range of 380 nm or more to less than 700 nm. The first wavelength-converted light has a 1/10 afterglow time longer than that of the second wavelength-converted light.