41 results about "Ultrasound Tomography" patented technology

The invention relates to a tomography device (1), especially an X-ray computer tomography device or ultrasound tomography device, comprising a balancing device (23; 45) for reducing an imbalance (61) that was determined by means of the measuring system (2) rotating about an axis of rotation (4). The balancing device (23; 45) comprising means mounted on the measuring system (2) for variably positioning a balancing mass and a control device (25) acting upon said means and designed in such a manner that the balancing mass, controlled by the control device (25), can be positioned in a location appropriate to reduce the imbalance (61). The balancing mass can be configured as a liquid (F) that is positioned in a liquid-tight channel. The invention also relates to a balancing method according to which a mass (m) of a liquid quantity balancing the imbalance (61) is determined and a magneto- and/or electro-rheological liquid (F) is introduced into an annular channel (31; 71; 81, 83, 85) in such a quantity that for the subsequent operation a quantity of liquid (F) dependent on the determined mass (m) is present in the annular channel (31; 71 81, 83, 85).

The disclosed concrete ultrasonic chromatography imaging algorithm comprises: providing a tower ART algorithm to gradual divide the mesh and combine with the algorithm; using the last mesh wave slowness to endow the next one; recalculating the ray length past through the mesh unit, modifying the wave slowness value; continuing to divide mesh till the mesh unit can not be less than the imaging unit. This invention can improve computation precision and image reconstruction quality to efficient take inversion the inner strength distribution and defect position and size for concrete.

An imaging tomography apparatus, in particular an x-ray tomography apparatus or an ultrasound tomography apparatus, has a stationary unit with a measurement unit for measurement of an out-of-balance condition, on which stationary unit is mounted an annular measurement device rotatable around a patient tunnel. Compensation weights for compensation of the out-of-balance condition are provided on the measurement device. To simplify the balancing procedure, the compensation weights are fashioned in the form of compensation rings surrounding the patient opening and with respectively defined out-of-balance conditions. The compensation rings are mounted on the measurement device such that they can be varied with regard to their relative positions in two parallel planes axially separated from one another.

An automated system for selecting patient breast laterality is provided. A position sensor system using force or image sensors is coupled to a scanning bed or seated-type apparatus. Regardless of the size and weight of the patient, the position of patient at the time of scan will not be centered with respect to the center of the scanner. This relative difference in the position will be sensed as a difference in the transducer signal of an image sensor when comparing the right- and left-hand sides of the field of view or will be sensed as a difference in voltage when comparing the right and left-hand side outputs of a circuit using force or pressure sensor.

In a method for compensation of an out-of-balance condition of an imaging data acquisition device, rotatable around a patient opening of a stationary unit of a tomography apparatus, such as an x-ray computed tomography apparatus or an ultrasound tomography apparatus, the data acquisition device being rotatably mounted such that it can rotate around an axis in a bearing of the stationary unit, vibrations transferred to the stationary unit by the out-of-balance condition of the data acquisition device, at least one of the out-of-balance vectors causing the out-of-balance condition is determined from the vibration measurement, and the axis of the data acquisition device is adjusted with regard to an axis of the bearing to compensate the out-of-balance condition.

An imaging tomography apparatus, in particular an x-ray tomography apparatus or an ultrasound tomography apparatus, has a stationary unit with a sensor for measurement of an out-of-balance condition of an annular data acquisition device rotatable around a patient opening in the stationary device. Compensation weights for compensation of the out-of-balance condition are provided on the data acquisition device. To simplify the balancing procedure, the compensation weights are disposed in two parallel planes axially separated from one another, and in each plane at least three compensation weights are fashioned as chambers that can be filled with a fluid. At least two of the chambers are connected with one another via at least one conduit for fluid transfer therebetween exchange.

The invention discloses an ultrasonic C scanning recognition method for internal defects of a forge piece. The ultrasonic C scanning recognition method for the internal defects of the forge piece is high in operability, the geometrical shape description is accurate, the detection result is visual and reliable and is permanently preserved conveniently, and a favorable judgment basis is provided for final judgment of quantification, qualitative diagnosis and location of the defects. Ultrasound tomography of the forge piece can be acquired by utilizing an ultrasonic C scanning function, and the specific shape and accurate size of the defects are further obtained, so that an accurate prediction basis is provided for safety assessment, service life evaluation and finite element stress calculation of the forge pieces.

The disclosed concrete ultrasonic chromatography imaging algorithm comprises: providing a probabilistic ART algorithm for real-time 2D inversion imaging; wherein, preliminary determining the probability of ray to pass through the defect unit according to the projection value of every ray; then further determining the probability of every mesh as a defect unit to select the initial iterative value for ART algorithm; assigning the projection error during the iteration till stop. This invention can improve computation precision and image reconstruction quality to efficient take inversion the inner strength distribution and defect position and size for concrete.

Ultrasound tomography imaging methods for imaging a tissue medium with one or more ultrasound transducer arrays comprising a plurality of transducers, wherein said transducers comprise source transducers, receiving transducers. The methods include assigning a phase value or time delay to source transducers, exciting the transducers and calculating a search direction based on data relating to the excited transducers.

Synthetic-aperture ultrasound tomography systems and methods using scanning arrays and algorithms configured to simultaneously acquire ultrasound transmission and reflection data, and process the data for improved ultrasound tomography imaging, wherein the tomography imaging comprises total-variation regularization, or a modified total variation regularization.

An orthogonal weak correlation bipolar encoding excitation method based on bi-level correlation function relates to an encoding excitation method of transmission-type ultrasound tomography. In order to solve the problem that ultrasound parameter errors are caused by interaction of ultrasound signals sent by array elements, the encoding excitation method includes following steps: an orthogonal weak correlation bipolar encoding set needed by encoding excitation is generated according to required array element amount launched simultaneously. The generated encoding set is used to modulate launching process of tomography and acquires waveform signals penetrating through detected objects. Transit time and amplitude are extracted from the received waveform signals by using the bi-level correlation function. Compared with existing methods without using the encoding excitation method, measurement time can be greatly reduced. Compared with conventional encoding excitation methods based on matched filtering, influence among array element transmitted waveforms can be reduced maximally, and precision of parameter extraction is not affected by encoding excitation process.

The present invention provides improved methods and systems for generating enhanced images of a volume of tissue. In an aspect, the method comprises receiving from a transducer, a plurality of acoustic signals derived from acoustic waveforms transmitted through the volume of tissue; generating from the acoustic signals, a first reflection rendering that characterizes sound reflection, the first reflection rendering comprising a first distribution of reflection values across a region of the volume of tissue; generating from the acoustic signals, a sound speed rendering that characterizes sound speed, the sound speed rendering comprising a distribution of sound speed values across the region; generating from the sound speed rendering, a second reflection rendering that characterizes sound reflection, the second reflection rendering comprising a second distribution of reflection values across the region; and rendering one or more combined images, based on the first reflection rendering and the second reflection rendering.

Imaging of internal structure of a patient, such as the prostate, is performed using ultrasound tomography by inserting a first ultrasound probe into the rectum of the patient, positioning a second ultrasound probe on an abdomen of the patient, and aligning the first and second ultrasound probes with one another to obtain acoustic information for reconstructing tomographic images of the internal structure. Light sources can also be shined to the tissue of interest, such as prostate say by a transurethral catheter thus making photoacoustic waves that can be received by the said TRUS or TRAB/TRPR transducers to reconstruct photoacoustic tomographic image of the tissue, as well.

A three-dimensional ultrasound tomography method and system based on spiral scanning are provided. The method includes the following. (1) Collecting raw data: an emission array element is switched while a probe maintains a uniform linear motion, so that changes in trajectory with time of a position of an equivalent emission array element in a three-dimensional space show a spiral or a partial spiral, and echo data is received. (2) Pre-processing data. (3) Calculating coordinates of each equivalent emission array element. (4) Calculating coordinates of an imaging focus point. (5) Performing synthetic aperture focusing on each imaging focus point. (6) Post-processing data. The disclosure improves the principle of the imaging method, the design of the overall process, etc. Volume data containing information of continuous tissue layers is obtained through spiral scanning. Applying the synthetic aperture focusing technique in the three-dimensional space improves the resolution between layers and shorten the scan time.

Microcalcifications can be detected using quantitative ultrasound tomography. Refraction-corrected reflection images generated from a quantitative ultrasound system can be thresholded, and morphologically analyzed to isolate voxels corresponding to microcalcifications.

The invention discloses a tissue mimicking phantom for detecting a transmission imaging pattern of ultrasound tomography equipment. The tissue mimicking phantom is cylindrical and comprises an upper panel (2), a lower panel (6), an acoustic window (3), a plurality of targets (4) and background tissue-mimicking materials (9), wherein a sealed space is formed by the upper panel (2), the lower panel(6) and the acoustic window (3) which is adhered and fixed to the side surface of the cylinder; the background tissue-mimicking materials (9) is stuffed in the sealed space; the targets (4) penetratethrough the upper panel (2) and the lower panel (6), and are embedded in the background tissue-mimicking materials (9); an inlet for stuffing the background tissue-mimicking materials (9) is formed inthe lower panel (6); and a block rubber is adhered to the inlet. The tissue mimicking phantom disclosed by the invention can be used for detecting and evaluating the transmission imaging pattern of the ultrasound tomography equipment.