A light emitting device (1) is a light emitting device for use in a photodynamic therapy. The light emitting device includes: a solid-state light-emitting element (2) that emits primary light in which an energy density is 0.5 W/mm.sup.2 or more; and a wavelength converter (3) including a first phosphor (4) that emits first wavelength-converted light (7). The first wavelength-converted light has a light component across at least a whole of a wavelength range of 700 nm or more and less than 800 nm. Energy of fluorescence emitted from the wavelength converter is 100 mW or more. A medical device includes the light emitting device.

To simplify the use of a functional scope of a medical image recording system, for example an endoscopy system, a method is proposed in which an image processing unit of the image recording system recognizes predefined image recording situations on the basis of an image sequence recorded using an image sensor of the image recording system and in response thereto proposes an adaptation to a user that results in an improved display and/or an improved recording of the image sequence in the respective recognized image recording situation. The adaptation can relate here to an algorithm, using which the image sequence is processed after the recording, and/or an image recording method currently used to generate the image sequence.

An imaging system and method includes a rolling shutter sensor that captures a plurality of images of a scene, a time-varying illumination source that illuminates the scene, and a processor that receives the plurality of images from the rolling shutter sensor and separates the plurality of images into a plurality of feeds. Each of the plurality of images is captured as a series of lines. The rolling shutter sensor and the time-varying illumination source are operated synchronously to cause a plurality of on-cadence lines of the rolling shutter sensor to receive more illumination from the time-varying illumination source than a plurality of off-cadence lines of the rolling shutter sensor. Each of the plurality of feeds has a different contribution of the time-varying illumination source to an overall illumination of the scene.

An illumination apparatus includes a light converter disposed on a distal end surface of a light guide, the light converter being configured to emit illumination light, which is generated by converting optical characteristics of primary light that is guided by the light guide, in a forward direction which is on the light converter side of the distal end surface, and in a backward direction which is on the light guide side of the distal end surface. The illumination apparatus further includes a light collector configured to collect backward illumination light into the light guide such that the backward illumination light is guided backward by the light guide, and a heat exhauster configured to convert the backward illumination light, which is guided by the light guide, to heat, and to exhaust the heat.

Provided are endoscopic image acquisition system and method that make observation of images easier when images are collected. The endoscopic image acquisition system includes a wavelength pattern changing unit that changes a wavelength pattern of irradiation light with which a part to be observed in a body cavity of a patient is irradiated or returning light from the part to be observed. Images of an observation wavelength pattern are captured at a certain frame rate. In response to acceptance of an acquisition instruction, images of a plurality of wavelength patterns different from one another are sequentially captured. The images of the plurality of wavelength patterns different from one another are stored in a storage unit. An image of a wavelength pattern other than the observation wavelength pattern is set not to be displayed.

There are provided a lesion part volume measuring method and an endoscopic diagnostic apparatus capable of easily detecting the volume of a lesion part without using a special treatment instrument. This problem is solved by detecting the position of a distal end portion of a scope hood from an image captured by an endoscope to which the scope hood is attached, finding the volume of the internal space of the scope hood, which is formed by the scope hood and the distal end surface of an insertion part, from the position of the distal end portion of the scope hood and the model of the endoscope and/or the model of the scope hood, and injecting water into the scope hood and detecting the volume of a lesion part from the difference between the water injection amount and the volume of the internal space of the scope hood.

There are provided a light source device, which is more compact and inexpensive than a known light source device, and an endoscope system having a compact and inexpensive light source device. In a light source device, a light source unit includes a first light source that emits blue light, a second light source that emits broadband green light including not only a green component but also a red component, and an optical filter that adjusts the amount of broadband green light for each wavelength. The optical filter has a characteristic in which the reflectance of the green component is smaller than the reflectance of the red component in the case of reflecting the broadband green light or a characteristic in which the transmittance of the green component is smaller than the transmittance of the red component in the case of transmitting the broadband green light.

An image processing method includes: sequentially generating fluorescent image data in accordance with light intensity of a wavelength component emitted from a fluorescent agent having been administered to a subject irradiated with excitation light, based on image data of the subject each time the image data is generated; sequentially calculating a change amount of the light intensity based on two sets of temporally successive fluorescent image data each time the fluorescent image data is generated; determining whether the change amount is not less than a first threshold indicating fluorescence expression; determining whether the change amount is less than a second threshold indicating a steady state of fluorescence after the change amount is determined to be not less than the first threshold; and outputting a message that fluorescence of the fluorescent agent is in the steady state if the change amount is determined to be less than the second threshold.

There are provided an endoscopic diagnosis apparatus, image processing method, and a non-transitory computer-readable recording medium that enable easy measurement of the size of a lesion portion or the like based on an endoscopic image captured through a normal operation without a special operation. A region detecting unit detects, from a position in an endoscopic image, a region having a periodic structure of living tissue. An imaging size calculating unit calculates, in number of pixels, an imaging size in the endoscopic image equivalent to a period in the periodic structure in the region having the periodic structure. A pixel size calculating unit calculates an actual size corresponding to one pixel of the endoscopic image. A scale generating unit generates scales indicating an actual size of the subject in the endoscopic image. A control unit causes the endoscopic image and the scales to be combined and displayed on a display unit.

A light source apparatus includes an optical illumination unit that converts optical characteristics of primary light emitted from a light source unit and emits secondary light different from the primary light; and an adapter unit that outwardly emits illumination light generated based on the secondary light emitted from the optical illumination unit and that is attachable to/detachable from the optical illumination unit. A radiation angle control member converts a traveling direction of the secondary light so that the secondary light allowed to emit from a light conversion member toward the radiation angle control member in the secondary light allowed to emit from the light conversion member travels toward the adapter unit through the secondary light emit portion.