41 results about "Multiphoton imaging" patented technology

In the systems and methods of the present invention a multifocal multiphoton imaging system has a signal to noise ratio (SNR) that is reduced by over an order of magnitude at imaging depth equal to twice the mean free path scattering length of the specimen. An MMM system based on an area detector such as a multianode photomultiplier tube (MAPMT) that is optimized for high-speed tissue imaging. The specimen is raster-scanned with an array of excitation light beams. The emission photons from the array of excitation foci are collected simultaneously by a MAPMT and the signals from each anode are detected using high sensitivity, low noise single photon counting circuits. An image is formed by the temporal encoding of the integrated signal with a raster scanning pattern. A deconvolution procedure taking account of the spatial distribution and the raster temporal encoding of collected photons can be used to improve decay coefficient. We demonstrate MAPMT-based MMM can provide significantly better contrast than CCD-based existing systems.

Fluorescent dyes and probes are key components in multiphoton based fluorescence microscopy imaging of biological samples. In order to address the demand for better performing dyes for two-photon based imaging, a new series of reactive fluorophores tailored for multiphoton imaging has been disclosed. These fluorophores are based upon the fluorene ring system, known to exhibit high fluorescence quantum yields, typically >0.7, and possess high photostability. They have been functionalized with moieties to act, e.g., as efficient amine-reactive fluorescent probes for the covalent attachment onto, e.g., proteins and antibodies. The synthesis and the single-photon spectral characteristics, as well as measured two-photon absorption cross sections of the reactive fluorophores in solution are presented. Spectral characterizations of bovine serum albumin (BSA) conjugated with the new reactive probe is presented.

A technique for simultaneous spatial and temporal focusing of femtosecond pulses improves the signal-to-back-ground ratio (SBR) in multiphoton imaging. This is achieved by spatially separating spectral components of pulses into a “rainbow beam” and recombining these components at the spatial focus of an imaging system. The temporal pulse width becomes a function of distance, with the shortest pulse width confined to the spatial focus. The technique can significantly improve the axial confinement and reduce the background excitation in multiphoton microscopy, and thereby increase the imaging depth in highly scattering biological specimens.

Relating to the field of optical technologies, the embodiment of the invention discloses a method for improving the multiphoton fluorescence microscope imaging resolution. The method includes: scanning a sample through a microscope repeatedly, acquiring the data of scanned multiple images, and acquiring the pixel point signal strength of sample target points in the multiple images according to the obtained multiple image data; and calculating the signal strength of sample target points in a reconstructed image obtained by processing the data of the multiple images according to the pixel point signal strength of the sample target points in the multiple images. The embodiment of the invention also discloses a device for improving the multiphoton fluorescence microscope imaging resolution. By means of the method and the device provided by the invention, and through specific mathematical calculation formulas, fusion of a multiphoton imaging technology and a structured illumination imaging technology is realized, while keeping the advantage of multiphoton original imaging depth, a super-resolution imaging ability is increased.

An apparatus and methods for high-speed non-linear spectrally encoded multi-photon imaging that are particularly suited for use in two photon fluorescence and fluorescence lifetime imaging. The system is capable of optical image compression and scale invariant digital zoom. A wavelength agile laser with digitally synthesized electro-optic modulation in a master oscillator-power amplifier configuration is combined with spectral encoding to eliminate the speed limitations of inertial scanning. The technique for fast two photon fluorescent imaging with simultaneous lifetime imaging independently detects the location, amplitude and lifetime of fluorescent emission by synthesizing a sequential excitation beam via digital electro-optic modulation of a quasi-CW swept source followed by time encoded detection. For fluorescent imaging, spectral and temporal mappings are employed separately, with quasi-CW spectral encoding used for pumping and time encoding for constructing the image at fluorescence wavelength.

An optical pulse source device comprising an optical pulse source (10) emitting an optical pulse train, optical amplifying means (20, 40) amplifying the optical pulse train and a saturable absorber device (30) removing noise floor in the optical pulse train. There is provided an optical pulse source device for multiphoton imaging system being of small size and high stability and capable of improving the SNR by its relatively simple configuration without using a synchronous circuit or an active time gate.

An optical attachment unit is described which can be inserted reversibly into the detection light path of a confocal optical microscope, which has the effect of modifying the magnification of the specimen at the level of the detector iris. This modification consists in the preferred form of a demagnification, so that high sensitivity is obtained at the expense of confocal function, as is required for multiphoton imaging and other purposes. No optical telescope or other imaging system used for confocal function is disturbed or removed by the operation of inserting the unit, so that the confocal function can be restored reproducibly and rapidly.

The present invention relates to a higher-order dispersion compensation device (210), the device being adapted to cooperate with a pair of optical components (P1, P2), e.g. a pair of prisms, being arranged to compensate first-order dispersion by separating different wavelengths spatially. The compensation device (210) has the form of a phase plate, wherein the phase change for each wavelength is adjusted by designing the height (h) at the corresponding position (x) of the plate so as to substantially compensate for higher-order dispersion. The invention is advantageous for obtaining a higher-order dispersion compensation device which is relatively simple to construct and use making it a quite cost-effective device. The invention also relates to a corresponding optical system and method for compensating dispersion where this is important, e.g. in a multiple-photon imaging system.

The invention discloses a computer readable storage medium. When the content of the computer readable storage medium is executed by the processor, multi-photon imaging can be performed on a pathological tissue section containing tumor environment information, and pathological division of a tumor microenvironment is further performed through image processing; extracting various collagen characteristic parameter values, such as morphology, energy and texture characteristic parameters, from three areas of tumor tissue, invasion edge and normal tissue; calculating differences and variation degrees among the regions according to the region feature parameters; establishing a collagen feature scoring model; calculating a collagen characteristic score through collagen characteristic parameters included in the model; the collagen feature score can well supplement the evaluation deficiency of a TNM staging system on tumor microenvironment soil, and more effectively provides reference for prognosis prediction of colorectal cancer.

The invention discloses multi-photon ultra-deep tissue imaging equipment based on coherent detection and a detection imaging method thereof. A multi-photon imaging technology is combined with an optical coherence tomography technology to realize ultra-deep and high-molecular specific imaging of a detected sample. The equipment comprises an ultrashort pulse femtosecond laser light source, a light modulation unit and an optical coherence microscopic unit. The light modulation unit modulates input laser to generate continuous spectrum laser. The optical coherence microscopic unit is used for conducting coherent detection on a biological sample. The system can detect OCT and SH-OCT signals of a tissue at the same time and obtain the specific structure of the tissue and the molecular micro-environment information of the surrounding environment of the tissue, and can quantitatively characterize the structure and function of the tissue through an image analysis method. The equipment can reflect the ultra-deep structure and functional information of the tissue, has the advantages of ultra depth, strong molecular specificity recognition capability, high temporal-spatial resolution, rapid imaging and the like, and provides the tissue structure and function information and the molecular specificity information at the same time.

The invention relates to a method for discriminating liver cancer differentiation grades by using a multiphoton imaging technology. The method comprises the following steps: firstly, carrying out quick freezing film shooting processing on a fresh liver cancer specimen subjected to surgical excision or puncture sampling; secondly, obtaining a collagen fiber MPM image inside a tumor by multiphoton microscopic imaging, processing the image, extracting features and then carrying out statistical analysis and discrimination by using Mann-Whitney inspection and Boxplot. According to the method disclosed by the invention, the multiphoton microscopic imaging and an image processing algorithm are utilized to be combined with a statistical analysis method for evaluating different differentiation grades of liver cancer; liver cancer differentiation grade data obtained by a label-free quick discrimination method are compared with pathologist diagnostic result data so as to achieve the aim of objectively evaluating the liver cancer differentiation grades; and the defects of time consumption, missed diagnosis and high subjectivity of a current clinical biopsy technique are effectively overcome.

The invention is applicable to the technical field of biophotonics and provides a heavy water sealing method. The heavy water sealing method comprises the step of dripping paroline to the surface of heavy water to cover the surface of the heavy water. The invention further provides a method for detecting multi-photon signal strength in multi-photon imaging. The method comprises the following steps: dripping the heavy water to a slide provided with a to-be-tested sample, and putting the slide provided with the to-be-tested sample into a multi-photon imaging system; dripping paroline to the surface of the heavy water to cover the surface of the heavy water; irradiating the to-be-tested sample by virtue of laser generated by the multi-photon imaging system so as to generate multi-photon signals, and collecting the multi-photon signals by virtue of a detector in the multi-photon imaging system; and detecting the multi-photon signal strength based on the collected multi-photon signals, so as to judge whether the change of the multi-photon signal strength is in a threshold range. According to the detection method, paroline has a very good effect on sealing the heavy water, so that the strength of the generated multi-photon signals is not attenuated along with time.

The invention discloses a method for shortening a pulse and obtaining an adjustable picosecond pulse, which comprises the steps of firstly modulating a pumping source to generate an optical pulse or an electric pulse to excite a gain switch type semiconductor laser, generating pulse laser with a chirp pulse component and a steady-state pulse component, then leading the pulse laser to a filter element through a light path, and obtaining short wave laser or long wave laser after filtering treatment, wherein the short wave laser is from the initial pulse component, has extremely short pulse widthcan achieve the purpose of shortening the pulse, and the filtering parameters are adjusted to change the wavelength and the pulse width of the short wave pulse laser so as to achieve pulse adjustment. The method can be applied to a single-mode gain switch semiconductor laser. Compared with common methods such as chirp compensation and pulse compression, the method has the advantages of simplicity, high feasibility and low cost, can conveniently obtain the adjustable picosecond pulse with high spectral purity, narrow optical pulse width and weak pulse jitter, combines the technologies such asoptical amplification and wavelength transfer, and can be applied to many fields such as multiphoton imaging and time resolution spectrum.

The invention provides a method for tissue evaluation of collagen at the incisal edge of a rectal cancer resection specimen, belonging to the technical field of pathological differentiation. Accordingto the method, tissue evaluation is carried out on collagen at the incisal edge of a rectal cancer resection specimen obtained after neoadjuvant therapy of the rectal cancer in virtue of a combination of Masson dyeing and multiphoton imaging analysis, so clinical workers are allowed to learn about the local fibration degree of the rectum tissue of patients and the healing status of anastomotic parts; and thus, reference is provided for clinical doctors in selection of surgical methods and in subsequent diagnosis and treatment, better individual-based treatment schemes are provided for patients, and the purposes of improving the living quality of patients and maximally avoiding severe complications are eventually achieved. The method provided by the invention is reasonable in design, mature in technology and easy to practice and has good clinical application prospects and high promotion value in scientific research.

The invention provides a method for evaluating completeness of a mesorectum specimen after colorectal cancer and relates to the technical field of medical imaging. According to the method, the mesorectum specimen after colorectal cancer is subjected to tissue evaluation on the basis of a multi-photon imaging technology in combination with staining sections, wherein the staining sections can be used for macroscopic analysis of gross structure and overall proportion of collagen of the mesorectum; multi-photon imaging can be used for micro-imaging the collagen of the mesorectum and analyzing thefine structure of the collagen; with combination of the two collagen analysis methods, completeness of the mesorectum can be distinguished from the macroscopic level and the microcosmic level, then the problem that the conventional naked eye based evaluation standards have obvious subjectivity and is lack of certain accuracy is solved, a clinical worker can be helped to know whether total mesorectal excision is realized in a colorectal cancer operation, and radical operation for colorectal cancer is more standardized.