Abstract:
A device for optically examining the interior of a body part by transillumination is provided. The device comprises: an illumination unit (2) adapted for emitting polarized light (8) towards a body part (5) to be examined; and a detector unit (6) adapted for detecting light in transmission. A polarizer (10) is arranged in front of the detector unit (6).
Abstract:
The present invention provides an optical fiber for connecting a probe head and a base station of a spectroscopic analysis system for analyzing the molecular composition of a volume of interest. The optical fiber comprises a core for transmission of excitation radiation from the base station to the probe head and a first cladding for transmission of multi-mode return radiation from the probe head to a spectroscopic analysis unit of the base station. Preferably, the first cladding is surrounded by a second cladding and therefore provides a multi-mode wave guide by itself. Appropriately designing the dimensions of the core, the first cladding and the second cladding provides an optimal collection and coupling efficiency of the optical fiber. Coating of the distal end facet of the optical fiber with multi-layer optical filters allows an effective separation of elastically and inelastically scattered radiation which is of advantage for the spectroscopic analysis.
Abstract:
The optical analysis system (20) for determining an amplitude of a principal component of an optical signal comprises a multivariate optical element (10) for reflecting the optical signal and thereby weighing the optical signal by a spectral weighing function, and a detector (9, 9P, 9N) for detecting the weighed optical signal. The optical analysis system (20) may further comprise a dispersive element (2) for spectrally dispersing the optical signal, the multivariate optical element being arranged to receive the dispersed optical signal. The blood analysis system (40) comprises the optical analysis system (20) according to the invention.
Abstract:
An optical detection method is provided, wherein a body part (5) comprising at least one joint is irradiated with light. Local attenuation of the light by the body part (5) is detected as attenuation measurements (2) at the position of the at least one joint and at the position of at least one other portion of the body part (5); and wherein blood flow to and/or from the body part (5) is temporarily at least partially blocked and thereafter enabled again (3). Distinct local attenuation measurements for the at least one joint and for at least one other portion of the body part (5) are performed for at least two of the times before (I), during (II), and after (III) the blocking of blood flow.
Abstract:
A spectroscopic system for determining a property of a fluid flowing through a volume of interest underneath the surface of the skin of a patient is described. The spectroscopic system comprises: a probe head having an objective for directing an excitation beam into the volume of interest and for collecting return radiation from the volume of interest; a base station having a spectroscopic analysis unit and a power supply; and a cable connecting the probe head and the base station for transmission of the return radiation from the probe head to the base station and for providing the probe head with power from the power supply of the base station.
Abstract:
The invention relates to an identification method carried out as follows. A surface structure and an inner structure of a body member are measured (ST1-ST4, ST7) so as to obtain a surface-structure measurement result (FPM) and an inner-structure measurement result (BVPM), respectively. The surface-structure measurement result (FPM) is compared (ST5) with a surface-structure reference result (FPR) that distinguishes an individual from other individuals. The inner-structure measurement result (BVPM) is compared (ST8) with an inner-structure reference result (BVPR) that is associated with the same individual and that distinguishes the individual from other individuals. The body member may be, for example, a finger. In that case, the surface structure comprises a fingerprint and the inner structure comprises a blood-vessel pattern.
Abstract:
The present invention provides a spectroscopic system as well as a method of autonomous tuning of a spectroscopic system and a corresponding computer program product. By detecting the position of return radiation in a transverse plane of an aperture of a spectroscopic analysis unit, a control signal can be generated that allows to drive servo driven translation or tilting stages of optical components. In this way a transverse misalignment of a spectroscopic system can be effectively detected. Generally, a plurality of different detection schemes are realizable allowing for an autonomous tuning of the spectroscopic system and for autonomous elimination of misalignment of a spectroscopic system.
Abstract:
An autofocus mechanism for a spectroscopic system determines a time varying optical property of a volume of interest. The mechanism measures the fluctuations of the optical property of the volume of interest for determining the position of the volume of interest. The spectroscopic system focuses an excitation beam into the determined volume of interest and collects return radiation emanating from the volume of interest for spectroscopic analysis. Preferably, inelastically scattered radiation of an excitation beam is separated from elastically scattered radiation for spectroscopic analysis. The elastically scattered radiation of the excitation beam is measured for fluctuations of the optical property of the volume of interest. A control loop maximizes the amplitude and/or intensity of the fluctuations and specifies the position of a volume of interest e.g. the center of a capillary vessel.
Abstract:
A system and method to determine a disease activity as a single value by way of optical measurements in order to facilitate an analysis of a current disease status and a future course of disease, thus assisting a doctor's diagnosis or decision on a therapy. A blood perfusion is varied in an area of interest, the area of interest is irradiated with light of at least two wavelengths, an intensity of light reflected and/or transmitted by the area of interest is detected, features are derived from detected intensity curves of at least two predetermined wavelengths under at least two different perfusion conditions, and the disease activity is determined using these features.
Abstract:
The present invention relates to a monitoring apparatus (101) for monitoring an ablation procedure. The monitoring apparatus (101) comprises an ultrasound signal providing unit for providing an ultrasound signal that depends on received echo series of an object (4) that is ablated. The monitoring apparatus (101) further comprises an ablation depth determination unit (103) for determining an ablation depth from the provided ultrasound signal. The ablation depth can be determined directly from the ultrasound signal and is an important parameter while performing an ablation procedure. For example, it can be used for determining the progress of ablation within the object (4) and for determining when the ablation has reached a desired progression.