36 results about "Densitometry" patented technology

A method has been described for deriving contour data in X-Ray images for vessels with differential absorption through applying a contour-finding algorithm on a shadow image and finding the vessel borders through segmentation based on image intensities. In particular, the method uses the following steps: finding a densitometric area of an above mentioned vessel, and displacing one or both of the borders inward until the densitometric measurement result between the borders after such displacing will start to change significantly. Furthermore, a specific procedure is introduced to automatically determine the conversion factor to equate the densitometrically based diameter to the contour based diameter of the vessel and to discriminate bifurcating or parallel vessels.

A process and osteodensitometry system using a dual-energy cone beam of X-rays is described. The system comprises an X-ray source capable of supplying a cone beam of X-rays with at least a first energy called the high energy and a second energy called the low energy, a two dimensional X-ray detector and electronic processor for processing images supplied by the detector. According to the process, a low energy image of a part of the anatomy of a patient, and a high energy image of the same part of the anatomy of a patient are acquired, and the images acquired at low energy and at high energy are matched before building up the map of bone densities of the part of the anatomy.

An x-ray densitometry system provides computer assistance to the operator in identifying possible sources of scanning or analysis error through computer review of the acquired data, operator input, and the ultimate diagnostic outputs.

A dental or orthopedic densitometry modeling system includes a computer with a digital memory adapted for storing patient densitometry information, an input and an output. A dental or orthopedic input device includes energy source and an energy sensor, both of which can be either external or intraoral to the patient. The sensor transfers densitometry signals to the computer, which creates, stores and compares digital densitometry models. A densitometry modeling method includes the steps of creating a densitometry database consisting of dental or orthopedic information and obtaining current dental or orthopedic densitometry information from a patient. The current information is compared to the database, which can include the patient's previous densitometry models, and an updated patient densitometry model is created.

An osseo classification and digital modality modeling system includes a computer with a digital memory adapted for storing patient densitometry information, an input and an output. An input subsystem includes a pair of source / receptor units mounted on a signal positioning subsystem, which is adapted for moving the source / receptor units through predetermined paths of movement, which can be circular or linear. The resulting tomographic data is synthesized to form any 3-D model or image, which is output for further analysis and classifying osseo structure and / or prosthetic osseointegration. An osseo classification and digital tomosynthesis method includes the steps of moving a pair of sensor / receptor units relative to a patient. The resulting signals output by the receptor are digitized and synthesized to form a 3-D image or model. Multiple depths of penetration and multiple widths can be captured from single acquisitions using digital tomosynthesis signal processing techniques. Osseo structure and / or prosthetic osseointegration is classified using the densitometry data.

The present invention relates to a dual energy X-ray apparatus and method for osteoporosis assessment and monitoring. The present invention takes a bone densitometry reading of a patient's wrist to assess osteoporosis and monitor bone loss condition by repeat measurements along with therapy. The bone densitometry system has an X-ray source, dual energy detectors, an arm-rest to place the patient's arm, a motion system to move the source-detector gantry along the patient's forearm, and a computer with a database to archive the wrist image, calculate the bone mineral density, maintain a history of patient information, and generate patient history reports.

The invention relates to a method of measuring the real density of the powder using double density bottles, which including the following steps: 1) weighing the quality of the density bottle A and B with the mass of ma and mb accurately, filling the bottle with agent fluid and weighing the quality m1, m2, checking the dielectric fluid density Rho0 corresponding to the temperature, compute the volume of the two bottle va, vb; 2) filling the bottle B with the powder to be measured, weighing the quality m3, and m[sample]=m3-mb; then filling the agent fluid to the surface of the powder 4.8-5.2mm, putting it to the vacuum chamber and pumping to the critical boiling point, keeping 28-32 minutes until the air bubble in the powder space output completely; 3) filling the agent fluid to bottle A,B at the same time, measuring the quality of bottle A m4, bottle B m5; 4) computing the sample's mass density according to the following formula: rho[sample]=m[sample] / v[sample]=(m3-mb)(m4-ma) / [(m4-ma)vb-(m5-m3)va].

The invention provides a rock sample total volume variable density measuring device and method, belonging to the field of oil and gas geological exploration and development. The rock sample total volumetric density measuring device comprises a magnetic pole (1), a magnetic fluid tank (2) and a sample disk (4); the magnetic pole (1) includes an N pole and an S pole; the magnetic fluid tank (2) It is arranged between the N pole and the S pole of the magnetic pole (1); a magnetic fluid (3) is housed in the magnetic fluid tank (2), and the apparent density of the magnetic fluid (3) can be controlled and adjusted by the action of an external electromagnetic field; The sample disk (4) is arranged in the magnetic fluid tank (2), and is connected with a rock sample weighing instrument (6) arranged outside the magnetic fluid tank (2). The invention utilizes the variable density of the magnetic fluid to realize the rapid measurement of the total volume of the rock sample, optimizes the method for measuring the porosity of the rock sample, shortens the analysis period, and improves the work efficiency.

The invention discloses a multifunctional X-ray bone densitometer, which comprises a frame, a guide rail, a U-shaped arm, an X-ray generating device, an X-ray detector, an X-ray shielding device, a motion system, a control system and a display system; On the upper surface of the frame, the U-shaped arm is set on the guide rail, the motion system is set on one end of the frame and connected to the guide rail, the control system is set on the other end of the frame, and connected to the display system, and the display system is set independently or on the On the rack, the X-ray generating device is set at one end of the U-shaped arm, the X-ray detector is set at the other end of the U-shaped arm, which is at the same height as the X-ray generating device, and the X-ray shielding device is set at the U-shaped end. X-ray detector side of the arm. The multifunctional X-ray bone densitometer provided by the invention is easy to use, can realize limb fracture diagnosis, bone density measurement and osteoporosis prediction and diagnosis functions, and avoids the inconvenience caused by the use of large equipment.

The invention discloses a microvessel distribution symmetry quantification method for gastric mucosa dyeing amplification imaging, which comprises an image segmentation method, a centroid eccentric distance method, a centroid eccentric angle method and a density method. The image segmentation method is used to extract the clear area and the whole picture of microvessels in the gastroscope image; the centroid eccentricity method quantifies the symmetry of the whole microvessel distribution from the angle of centroid eccentricity; the centroid eccentric angle method quantifies the symmetry of the whole microvessel distribution from the perspective of centroid eccentricity angle ; The density method quantifies the distribution symmetry of microvessels in the whole map from the perspective of density. Finally, by weighting the symmetry score of centroid eccentricity distribution, centroid eccentricity angle distribution symmetry score, and density distribution symmetry score, the final symmetry coefficient of microvessel distribution in the whole map is obtained, and then according to the symmetry coefficient of the distribution of microvessels in the whole map, the distribution The symmetry level is judged.