摘要:
The present invention provides an autonomous calibration of a multivariate based spectroscopic system that is preferably implemented as a multivariate based spectrometer. The spectroscopic system is based on a multivariate optical element that provides a spectral weighting of an incident optical signal. Spectral weighting is performed on the basis of spatial separation of spectral components and subsequent spatial filtering by means of a spatial light modulator. Calibration of the spectroscopic system is based on a dedicated calibration segment of the spatial light modulator, whose position corresponds to a characteristic calibration or reference wavelength of the incident optical signal. Preferably, the calibration or reference wavelength is given by the wavelength of the excitation radiation generated by the optical source that serves to induce scattering processes in a volume of interest.
摘要:
The present invention relates to an analysis apparatus, in particular a spectroscopic analysis apparatus, for analyzing an object, such as blood of a patient, and a corresponding analysis method. To aim the confocal detection volume inside a blood vessel orthogonal polarized spectral imaging (OPSI) is used to locate blood capillaries in the skin. An imaging system (img) with slightly shifted imaging planes (i1, i2) for OPS imaging of blood vessels is proposed to provide auto-focusing. The confocal Raman detection plane (dp) is located in between these two imaging planes (i1, i2). Based on measured amount of defocus for the imaging planes (i1, i2), the focusing of the imaging system (img), the excitation system (exs) for exciting the target region and the detection plane (dp) is located inside the blood vessel (V). Thus, continuous auto-focusing with high accuracy can be achieved. The invention relates also to an optical tracking system for continuously tracking a point of a moving object (obj).
摘要:
The invention relates to a method of imaging an interior of a turbid medium (45) comprising the following steps: accommodation of the turbid medium (45) inside a receiving volume (20); coupling transmission input light (65) from a transmission light source into the receiving volume (12), with said transmission input light (65) being chosen such that it is capable of propagating through the turbid medium (45) and with at least a part of said transmission input light (65) passing through a matching medium (50) in the receiving volume (12), said matching medium (50) being chosen to reduce optical boundary effects at an interface between the turbid medium (45) and its surroundings; detection of transmission output light emanating from the receiving volume as a result of coupling transmission input light (65) from the transmission light source into the receiving volume (12) through use of a transmission photodetector unit. The invention also relates to a system for imaging an interior of a turbid medium (45) and a medical image acquisition system both using the method. According to the invention, the method, system for imaging an interior of a turbid medium (45), and medical image acquisition system are adapted such that data relating to the exterior of the turbid medium (45) can be obtained. This object is realized in that the method further comprises the following additional steps: coupling geometry input light (70, 75, 80) from a geometry light source into the receiving volume (12), with the receiving volume comprising the turbid medium (45), with the receiving volume (12) further comprising a geometry medium (60) for surrounding the turbid medium (45) during coupling of geometry input light (70, 75, 80) into the receiving volume (12), and with the combination of the geometry input light (70, 75, 80), the geometry medium (60), and the interface being chosen for creating a contrast between the turbid medium and its surroundings; —detection of the contrast between the turbid medium (45) and its surroundings; reconstructing an image of an interior of the turbid medium (45) using the detected contrast.
摘要:
The invention provides a system (102) for accurately detecting a patient's (114) movement during imaging procedures. The system comprises a camera (126) for providing a stream of camera images of a part of a patient's exterior (206). The system (102) furthermore comprises a fiducial element (116), which fiducial element (116) is mountable on said part of the patient's exterior (206), and which fiducial element (116) is detectable in the stream of camera images, and an image processor (128) for detecting a displacement of the fiducial element based on consecutive camera images comprised in at least the stream of camera images and for generating an output signal (129) indicative for said displacement. Herein, the fiducial element (116) has an in-plane stiffness which is substantially larger than an in-plane stiffness of said part of the patient's exterior. In addition, the fiducial element (116) and said part of the patient's exterior are provided with substantially equal outer in-plane dimensions.
摘要:
The present invention provides an optical analysis system for determining an amplitude of a principal component of an optical signal. The principal component is indicative of the concentration of a particular compound or various compounds of a substance that is subject to spectroscopic analysis. The optical signal is subject to wavelength selective weighting and wavelength selective spatial separation specified by a weighting function. The optical signal is preferably separated into two parts that corresponding to a positive and negative spectral band of the weighting function, respectively. The separation provides separate detection of the separated parts of the optical signal without significant loss of intensity, thereby providing an improved signal to noise ratio of the determined principal component. Separation and weighting of the optical signal is realized by two multivariate optical elements.
摘要:
The invention relates to a method of imaging an interior of a turbid medium (45) comprising the following steps: accommodation of the turbid medium (45) inside a receiving volume; coupling transmission input light (65) from a transmission light source into the receiving volume, with said transmission input light (65) being chosen such that it is capable of propagating through the turbid medium (45); detection of transmission output light emanating from the receiving volume as a result of coupling transmission input light from the light source into the receiving volume through use of a transmission photodetector unit. The invention also relates to a system for imaging an interior of a turbid medium (45) and to a medical image acquisition system both using the method. The method, system, and medical image acquisition system are adapted such that an improved way of obtaining data relating to the exterior of the turbid medium (45) is realized. The object of the invention is realized in that the method further comprises the following steps:—coupling geometry input light (70, 75, 80) from a geometry light source into the receiving volume, with the receiving volume comprising the turbid medium (45) and with the combination of the geometry input light (70, 75, 80) and the interface (60) being chosen for creating a contrast between the turbid medium (45) and its surroundings; detection of the contrast (60) between the turbid medium (45) and its surroundings through use of a contrast photodetector unit; reconstructing an image of an interior of the turbid medium (45) using a the detected contrast (60). The system for imaging an interior of a turbid medium (45) and the medical image acquisition device are adapted to further comprise a geometry light source and a contrast photodetector unit.
摘要:
A lithographic apparatus includes a radiation system that provides a beam of radiation, and a support structure that supports a patterning structure. The patterning structure is configured to pattern the beam of radiation according to a desired pattern. The apparatus also includes a substrate support that supports a substrate, and a projection system that projects the patterned beam onto a target portion of the substrate. The projection system includes an optical element that has a beam exit area through each of which the patterned beam passes. The apparatus further includes a fluid cleaning system that cleans a fluid to be introduced into a region in between the optical element and the substrate. The fluid cleaning system includes a fluid inlet, a fluid outlet, and a cleaning zone disposed between the inlet and outlet. The cleaning zone includes a nucleated surface provided with a plurality of nucleation sites.
摘要:
A system for accurately detecting a patient's movement during imaging procedures includes a camera for providing a stream of camera images of a part of a patient's exterior and a fiducial element mountable on part of the patient's exterior. The fiducial element is detectable in the stream of images. An image processor is configured to detect a displacement of the fiducial element based on consecutive images including in at least the stream of images and to generate an output signal indicative of the displacement. The fiducial element has an in-plane stiffness which is substantially larger than an in-plane stiffness of the part of the patient's exterior. In addition, the fiducial element and the part of the patient's exterior are provided with substantially equal outer in-plane dimensions.
摘要:
The invention relates to imaging of a turbid medium, for example in connection with optical mammography. A device for imaging a turbid medium (20) is disclosed, the device comprising: a holder (20) arranged for receiving the turbid medium and a matching fluid (21); one or more radiation sources (24) and one or more photodetectors (25). The matching fluid is a vapor with one or more optical properties of the matching fluid substantially matching the corresponding one or more optical properties of the turbid medium. In an embodiment, the matching fluid (21) is a composite vapor comprising at least two components.
摘要:
Disclosed is a method and a device for optical imaging of a turbid medium. This method comprises a reference measurement of reference intensities of light emanating from the turbid medium at a reference blood oxygen saturation (SaO2) in the turbid medium and a reference imaging step for reconstructing a reference image of the turbid medium from the measured reference intensities. Furthermore the method comprises a contrast measurement of the contrast intensity of the light emanating from the turbid medium at a contrast blood oxygen saturation (SaO2) level in the turbid medium and a contrast imaging step for reconstructing a contrast image of the turbid medium from the measured contrast intensities. A comparison is made between the contrast image to the reference image of the turbid medium.