369 results about "Radiation Dosages" patented technology

The invention is a seamless projection lithography system that eliminates the need for masks through the use of a programmable Spatial Light Modulator (SLM) with high parallel processing power. Illuminating the SLM with a radiation source (1), which while preferably a pulsed laser may be a shuttered lamp or multiple lasers with alternating synchronization, provides a patterning image of many pixels via a projection system (4) onto a substrate (5). The preferred SLM is a Deformable Micromirror Device (3) for reflective pixel selection using a synchronized pulse laser. An alternative SLM is a Liquid Crystal Light Valve (LCLV) (45) for pass-through pixel selection. Electronic programming enables pixel selection control for error correction of faulty pixel elements. Pixel selection control also provides for negative and positive imaging and for complementary overlapping polygon development for seamless uniform dosage. The invention provides seamless scanning by complementary overlapping scans to equalize radiation dosage, to expose a pattern on a large area substrate (5). The invention is suitable for rapid prototyping, flexible manufacturing, and even mask making.

The present invention provides one kind of water gel containing natural high molecular material and its preparation process. The water gel has cross-linking degree of 70-95 % and water absorption of 500-80000 %, and contains natural high molecular material or its derivative selected from chitin, chitin derivative, chitosan, chitosan derivative, carrageenin, etc. The water gel may have synthetic high molecular material, inorganic filler, cross-linking sensitizer, medicine and other assistant added. It is prepared through radiation cross-linking, with the radiation dosage being 10-40 kGy. The water gel of the present invention has high water absorption, high flexibility, good medicine slow releasing performance, and may be used in wound dressing, etc.

A method to assist in the selection of optimum beam orientations for radiation therapy when a planning treatment volume (PTV) is adjacent to one or more organs-at-risk (OARs). A mathematical analysis of the boundaries between the PTV and OARs allows the definition of a continuum of pairs of gantry and table angles whose beam orientations have planes that are essentially parallel to those boundaries, and can, therefore, separate the PTV from the OARs when a multi-leaf collimator is used in the therapy. The Radiation Oncologist can then select one or more pairs of gantry and table angles from the continuum as input to a beam optimization step. The selected angles can deliver highly uniform dose to the PTV, while minimizing the radiation dose to the OARs.

A general imaging scheme is proposed for applications of CBCT. The approach provides a superior CBCT image quality by effective scatter correction and noise reduction. Specifically, in its implementation of CBCT imaging for radiation therapy, the proposed approach achieves an accurate patient setup using a partially blocked CBCT with a significantly reduced radiation dose. The image quality improvement due to the proposed scatter correction and noise reduction also makes CBCT-based dose calculation a viable solution to adaptive treatment planning.

A radiotherapeutic apparatus using high-energy electron beams to radiate the bed of removed tumor and the residual tumor tissue in excision operation features that the CT or MRI 3D imaging software is used to determine the position of tumor focal, an analog technique is used to determine the incident direction, angle and position of electron beam, a radiotherapeutic plan system is used to calculate the radiation dosage, and a laser locator on the radiating head with straight-line electron accelerator is used to align the electron beam to the tumor focal.

A system and method for tomographic image reconstruction using truncated limited-angle projection data that allows exact interior reconstruction (interior tomography) of a region of interest (ROI) based on the linear attenuation coefficient distribution of a subregion within the ROI, thereby improving image quality while reducing radiation dosage. In addition, the method includes parallel interior tomography using multiple sources beamed at multiple angles through an ROI and that enables higher temporal resolution.

A system and method for tomographic image reconstruction using truncated limited-angle projection data that allows exact interior reconstruction (interior tomography) of a region of interest (ROI) based on the linear attenuation coefficient distribution of a subregion within the ROI, thereby improving image quality while reducing radiation dosage. In addition, the method includes parallel interior tomography using multiple sources beamed at multiple angles through an ROI and that enables higher temporal resolution.

Methods and devices are for providing the delivery of radioactive therapeutics to a cervix using a split ring applicator. The split ring applicator includes a central tandem and a plurality of adjustable split ring tubes that are adjustable laterally in relation to a cervical axis. A radiation dosage is deliverable to a cervical wall by at least one of the plurality of adjustable split ring tubes.

In order to facilitate the display and evaluation of data acquired while irradiating a body, e.g. a patient undergoing radiation therapy, using a dosimetry system which has a plurality of sensors for disposition on, in or near the body to be irradiated and a dosimetry report comprises representations, for example drawings or photographs, of the body irradiated, along with the positions and the dose data for those specific sites where the dosimeter sensors were placed. Preferably the representation comprises actual photographs of the patient with the sensors attached taken during, before or after irradiation within the sensors attached.

The present invention discloses the preparation process of irradiation resistant low smoke no-halogen fire retarding ethylene-propylene rubber as cable material. The preparation process includes heating and mixing ethylene-propylene rubber, aluminum hydroxide, silicone as fire retarding synergist, lead compound, antiager, copper resisting agent, gamma ray absorbent, liquid peroxide vulcalizer and phenolic heat stabilizer in a banbury mixer; and air cooled pelletizing in a double screw extruder. Thus prepared cable material has volume resistivity higher than 2x1015 Ohm.cm, heat life over 90 deg.c x 50 year, accumulated gamma ray resistance of 220 Mrad and radiation dosage rate resistance lower than 1Mrad / h, and is suitable for producing cable insulation layer for use in high nuclear radiation environment.

A method for processing data in a radiation procedure includes obtaining operation data, and formatting the operation data into a set of image data, wherein the operation data comprises one or a combination of a gantry angle, a patient position, a patient orientation, radiation dose rate, radiation dose fraction, beam pulse rate, beam energy, time when beam was activated, time when beam was deactivated, and beam variation (if any) during an image readout. Also machine axis information, machine status info and operation data from other systems like for instance the RPM system may be included. A method of processing data in a radiation procedure includes obtaining operation data, obtaining an image data, and combining the operation data with the image data in substantially real time.

The present invention provides a support for a patient undergoing radiation therapy that preserves radiation build-up, such as normally spares the skin from receiving high amounts of radiation dose. The support includes at least one gas-filled bladder that displaces some tissue from the path of the radiation and / or spaces the tissue being treated from foam or the like.

A method, code and system for planning the treatment a lesion on or adjacent to the retina of an eye of a patient are disclosed. There is first established at least two beam paths along which x-radiation is to be directed at the retinal lesion. Based on the known spectral and intensity characteristics of the beam, a total treatment time for irradiation along each beam paths is determined. From the coordinates of the optic nerve in the aligned eye position, there is determined the extent and duration of eye movement away from the aligned patient-eye position in a direction that moves the patient's optic nerve toward the irradiation beam that will be allowed during treatment, while still maintaining the radiation dose at the patient optic nerve below a predetermined dose level.

Multi-tone resists can enhance the resolution limit of a lithographic process by advantageously using the changeable solubility of a resist composition as a function of lithographic radiation dosage. By imaging a multi-tone resist with different doses of lithographic radiation in a selected pattern, the pattern can be imparted to the resist upon subsequent development of the resist. In some aspects, a resist composition is utilized having an aliphatic polymer (e.g., a copolymer with fluoropolymer units and / or methacrylate units) with acid labile groups and a plurality of crosslinkable groups that can be crosslinked to other portions of the aliphatic polymer. Other components such as base generators and / or crosslinking agents can also be included. Such compositions can be useful in extending the resolution of UV lithographic radiation processes (e.g., wavelengths less than 200 nm). Other aspects of such compositions and methods are also discussed.

A radiation application time upper limit calculator calculates a radiation application time upper limit based on a subject thickness, as measured by a subject thickness measuring unit. While an X-ray tube is controlled according to exposure conditions that have been set in order to apply a radiation X to a breast to capture a radiation image thereof, an X-ray tube controller compares the applied radiation time with the radiation application time upper limit. If the applied radiation time exceeds the radiation application time upper limit, then application of radiation to the subject is interrupted, so as to prevent an inappropriate radiation dosage from being applied to an X-ray detector.

An aramid fibre / epoxy resin composite interface performance improving method relates to a macromolecule material modification processing method. The invention solves the problems that the interface between the prior Kevlar-49 fibre and the prior epoxy resin has weak combination and the fiber surface modification processing method is not suitable for industrialized production. The Kevlar-49 fibre surface modification processing method of the invention is as follows: firstly the Kevlar-49 fibre is dried, then the dried Kevlar-49 fibre and liquid medium are sealed in a glass reactor; under the condition of normal temperature, normal atmosphere and the protection of protective gas, a gamma ray with <60>Co as radiation source is adopted to radiate; the radiation dosage is between 0.1 and 1000 kGy and the radiation dosage rate is between 3 and 7 kGy / h. The invention has the advantages of simple operation, stable technique, reliable product quality, environmental protection and industrialized production. The method of the invention improves the fibre surface energy, thereby improving the combination intensity of the interface between the fibre and the epoxy resin matrix and exerting the comprehensive performance of Kevlar-49 fiber reinforced composite farthest.

The invention provides a scattering correction method for a projected image and a device, wherein the scattering correction method comprises: obtaining the projected image of a scanned object; obtaining the characteristic parameter of the scanned object; obtaining the scattering image of the scanned object through calculation according to the Monte Carlo simulation method on the basis of a system parameter and the characteristic parameter; carrying out scattering correction to the projected image through the scattering image. According to the technical scheme of the invention, on the premise of not increasing radiation dosage absorbed by a patient, the discomfort and pain suffered by the patient in the checking process are reduced, in consideration of the impact of physical factors such as secondary and higher scattering, energy response and the like on scattering, the calculation for the scattering is closer to the physical situation, and the image quality of the projected image is enhanced.

An X-ray imaging apparatus includes an FPD and short-circuited pixels. The FPD has pixels arranged in arrays for detecting an X-ray image. The short-circuited pixels detect a radiation dose of X-rays in the FPD. The X-ray imaging apparatus is changed over between first and second operating modes. The first operating mode is selected in case of combining with an X-ray generating apparatus with communication compatibility, and performs an exposure control for controlling a total radiation dose according to a detection signal from the short-circuited pixels. The second operating mode is selected in case of combining with an X-ray generating apparatus with communication incompatibility, and performs control of start synchronization for synchronizing operation of the FPD with the emission start of X-rays according to a detection signal from the short-circuited pixels. Thus, control of the X-ray imaging apparatus is changed over appropriately.

A hybrid multi-radionuclide sealed source for use in brachytherapy comprising a plurality of radionuclides is disclosed. The differing decay rates of the radionuclides in the hybrid multi-radionuclide sealed source combine a large initial dose of radiation followed by an extended dose of radiation contained within the single source. The sealed source may comprise a seed, a flexible strand, a rigid strand, a wire, a coil or a catheter.

A method to assist in the selection of optimum beam orientations for radiation therapy when a planning treatment volume (PTV) is adjacent to one or more organs-at-risk (OARs). A mathematical analysis of the boundaries between the PTV and OARs allows the definition of a continuum of pairs of gantry and table angles whose beam orientations have planes that are essentially parallel to those boundaries, and can, therefore, separate the PTV from the OARs when a multi-leaf collimator is used in the therapy. The Radiation Oncologist can then select one or more pairs of gantry and table angles from the continuum as input to a beam optimization step. The selected angles can deliver highly uniform dose to the PTV, while minimizing the radiation dose to the OARs.

The invention discloses a white LED lamp secondary encapsulation structure capable of reducing blue-light hazards. The white LED lamp secondary encapsulation structure comprises a substrate, a blue LED chip and a YAG (yttrium aluminum garnet) yellow fluorescent powder layer. The blue LED chip is fixed onto the substrate, the YAG yellow fluorescent powder layer is overlaid on the blue LED chip, an outer fluorescent lampshade which covers the blue LED chip and the YAG yellow fluorescent powder layer is further fixed onto the substrate, and YAG yellow fluorescent powder is arranged on the outer fluorescent lampshade. The white LED lamp secondary encapsulation structure has the advantages that colors of white light emitted by an LED illuminating lamp are uniform, soft and harmonious by the aid of the white LED lamp secondary encapsulation structure; more importantly, influence of heat dissipated by the blue LED chip on the performance of the fluorescent powder can be effectively reduced, color temperature drift due to the heat of the chip is prevented, and the service life of the fluorescent powder is prolonged; blue-light radiation dosage is effectively reduced, blue-light radiation is scattered uniformly, and the potential hazards to people and organisms are reduced.

A method and system are disclosed for estimating internal position information of a target in real-time based on a single gantry-mounted x-ray imager and a respiratory signal. The x-ray imaging is done periodically to limit radiation dosage. Initial parameters for the estimation model are determined in a pre-treatment session using four dimensional computed tomography (4D CT) in combination with a respiratory signal acquired from the patient. The model parameters are updated during treatment based on the periodic x-ray image data and the respiratory signal.

An endorectal balloon having a pocket thereon for holding a sensor cable that can be used for radiation dosimetry or to detect motion of the prostate or balloon.

The invention discloses a carbon nano-tube-reinforced thermo-sensitive composite hydrogel and a radiation preparation method. The carbon nano-tube-reinforced thermo-sensitive composite hydrogel is composed of components as follows: (1) Zero point one to five percent of carbon nano-tubes, (2) Three to twenty percent of monomers, (3) Crosslinking agent, and (4) Water, wherein, the weight of the crosslinking agent is one to five percent of the weight of the monomers, and the diameter of the carbon nano-tube is 20 to 30 nm. After the monomers and the crosslinking agent are added into the solution, the system is aerated with inert gas N2 for ten minutes in order to remove the O2 in the system, and after being sealed, the system is dispersed by utilizing ultrasonic for one hour in order to form a stable polymerization reaction system. Afterwards, the polymerization system is put into a radiation field, radiation dosage is selected as 6 to 22 kGy, the polymerization system is irradiated by 60Co Gamma-radials or electron beams, so that a polymerization reaction occurs, the product is dipped in deionized water in order to remove the unreacted monomers and crosslinking agent, and thus the composite hydrogel is obtained. The invention has the advantages of simple polymerization process and easy control. The prepared composite hydrogel has both sensitive temperature response performance and good dynamic performance, and purity is high.

The invention belongs to the field of biomedical material and relates to a preparation method of biological function composite auxetic hydrogel with shell core structure. In the method, the biological function composite auxetic hydrogel with shell core structure is prepared by the radiation cross-linking technology or freezing / unfreezing method, i.e. an inner core is of a dense structure with lowwater content, and an outer shell is of a communicated porous structure with relatively low modulus. Macroscopically, a negative Poisson's ratio effect of the material is realized, and the inner coreand outer shell are in firm combination. By controlling the core component and size as well as the shell composition and structure of the material, the auxetic hydrogel meeting various application requirements can be prepared; by controlling the radiation dosage in the radiation cross-linking as well as the parameters of the freezing / unfreezing process such as temperature, time, circulation timesand the like, the condensed state structure and crystallization degree of the polymer can be changed so as to prepare the biological function composite auxetic hydrogel with controllable performance.The biological function composite auxetic hydrogel is suitable for the bionic implantation repair material for the soft tissues such as blood vessels, nerves, cartilage, intervertebral disk, muscles,ligaments and the like.

The invention discloses a composite nanoparticle for sensitizing tumor radiotherapy and a preparation method and application of the composite nanoparticle. The composite nanoparticle comprises proteinand bismuth selenide and manganese dioxide which grow on the protein. The preparation method comprises the steps that a manganese salt solution is added into a aqueous dispersion of bismuth selenide-protein nanoparticles, after uniform mixing is carried out, a strong alkaline solution is added, the pH value is adjusted to alkaline, a heating temperature control reaction is carried out, ultrafiltration and washing are carried out, and the composite nanoparticle is obtained. The composite nanoparticle has the advantages that the water dispersibility and biocompatibility are good, radiotherapy is sensitized by increasing the local radiation dosage through bismuth selenide and improving tumor hypoxia through manganese dioxide, and computed tomography, magnetic resonance and photoacoustic multimode imaging angiography can be achieved simultaneously; the preparation method of the composite nanoparticle is simple, convenient and practical, the condition is mild, the controllability is good,and the implementation and promotion are easy; the composite nanoparticle can achieve the integration of targeted radiotherapy sensitization, diagnosis and treatment of the tumor, and has a broad application prospect in the fields of nano-medicine, disease diagnosis, tumor treatment and the like.

The invention provides a CT (Computed Tomography) scanning method and device for heart. The method comprises the following steps: pre-scanning the heart information of an object to be scanned to obtain initial scanning data; reconstructing a plurality of initial heart images at different period phases according to the initial scanning data; determining an optimal period phase of the object to be scanned according to the plurality of initial heart images; performing final scanning on the heart of the object to be scanned based on the optimal period phase. In the embodiment of the invention, the X-ray radiation dosage of a patient in a scanning process can be lowered, the risk of more X-ray irradiation on the patient is lowered on the premise of ensuring the heart image quality, and the correctness and effectiveness of diagnosis can be ensured.

The present invention advantageously provides a method and system for providing accurately localized, non-invasive radiation treatment for ocular melanoma or other intraocular indications through the completion of specified research tasks. The present invention further provides for dynamic localization of tumors associated with such indications. The system of the present invention includes the CYBERKNIFE system, a robust eye pupil tracking system, and an integrated software package to achieve intra-beam fractional tumor tracking during radiation delivery. The system may further include a mechanical phantom incorporated with a radiation dosimetry calibration kit for validation.