358 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 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.

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.

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, 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.

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.

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 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 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.

The invention provides a reverse Monte Carlo particle transporting and simulating system. According to a designed object or an external measuring result, and via direct reverse Monte Carlo simulating and particle transporting principle, three-dimensional transporting process and radioactive source information of radioactive intermediate particles are obtained. The reverse Monte Carlo particle transporting and simulating system comprises a state parameter and sequence inputting and processing module, an automatic modeling module, a reverse moving process simulating module, a result recording and error computing module, and a database managing module. Conventional Monte Carlo particle transporting and simulating are performed via a forward simulating method and belong to direct result simulating process according to direct reasons. In actual situation, in order to reproduce inputting or intermediate processes of the particle transportation, above information can be obtained via the reverse Monte Carlo particle transporting and simulating system. The reverse Monte Carlo particle transporting and simulating system has the advantage that intermediate and staring processes of three-dimensional particle transport is reversely simulated according to the target result, and precise simulating data for part designing, computing and optimizing of radiation dosage of a human body, breeding irradiating and the like about a nuclear device are provided.

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.

The invention belongs to radiological safety protection equipment, particularly relating to an automatic safety protection device for preventing medical radiation. A top frame is fixed at the upper ends of two upright posts, respectively forming a half-T structure or a T structure; horizontal and longitudinal slide ways are fixed on the top frame; two lead-covered rolling curtain boxes are fixed under the longitudinal slide way and can slide horizontally and longitudinally; a lead-covered rolling curtain is extended out of and suspended under each lead-covered rolling curtain box; a control box is fixed at the intersecting position between the top frame and the upright posts or is suspended on a wall; a remote control box is fixed on the control box; and the two lead-covered rolling curtain boxes of a main protection part are respectively fixed at the two sides of the top frame. The invention has the beneficial effects that: the protective lead-covered curtain can be flexibly regulated to widen the protection range aiming at patients of different statures, thereby reducing radiation dosage of the patients and greatly lessening radiation hurt on the patients; moreover, no harm is brought to operators. The device has the advantages of simple and convenient operation, high reaction speed, reasonable structural design, low production cost and easy promotion.

The invention discloses an accelerator X-ray dosage monitoring device in an X-ray radiation imaging system. The X-ray radiation imaging system comprises an accelerator X-ray source, a collimator for collimating X rays and a detection probe. The X-ray dosage monitoring device comprises an X-ray dosage monitoring probe, wherein X-ray dosage measured by the detection probe is corrected according to the X-ray radiation dosage monitored by the X-ray dosage monitoring probe. The X-ray dosage monitoring probe is arranged on at lease one side of a collimating slit of the collimator and is used for monitoring the dosage of the X rays radiated from an accelerator; and by changing the positions of dosage monitoring points, the dosage monitoring probe is arranged on the collimator, the monitoring probe is close to an accelerator target spot and the dosage rate of the accelerator received by the monitoring probe is high, so that data has high statistic properties. Simultaneously normal beams are not blocked, so the statistic properties of probe data of the detection probe are not reduced.