40 results about "Ultrasound Tomography" patented technology

Ultrasound sound-speed tomography requires accurate picks of time-of-flights (TOFs) of transmitted ultrasound signals, however, manual picking on large datasets is time-consuming. An improved automatic TOF picker is taught based on the Akaike Information Criterion (AIC) and multi-model inference (model averaging), based on the calculated AIC values, to improve the accuracy of TOF picks. The automatic TOF picker of the present invention can accurately pick TOFs in the presence of random noise with average absolute amplitude of up to 80% of the maximum absolute synthetic signal amplitude. The inventive method is applied to clinical ultrasound breast data, and compared with manual picks and amplitude threshold picking. Test results indicate that the inventive TOF picker is much less sensitive to data signal-to-noise ratios (SNRs), and performs more consistently for different datasets in relation to manual picking. The technique provides noticeably improved image reconstruction accuracy.

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 integrated type capacitance-ultrasound tomography sensor in the technical field of sensor design. The sensor comprises a capacitance tomography sensor and an ultrasound tomography sensor, wherein the capacitance tomography sensor comprises one or more measuring electrode modules, and the ultrasound tomography sensor consists of an ultrasonic transducer array. The sensor surrounds a space to be measured, the measuring part of the capacitance tomography sensor is used for measuring the distribution of dielectric coefficients in the space, and meanwhile, the measuring part of the ultrasound tomography sensor is used for measuring the distribution of ultrasound propagation velocity of a section to be measured. The sensor can provide measured capacitance signals and ultrasound signals at the same time, and the flame distribution image of the space to be measured is reconstructed by virtue of the capacitance signals and the ultrasound signals through a unified image reconstruction algorithm.

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, particularly with edge-guided or spatially variant regularization.

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.

Ultrasound tomography arrays and vortex shedding devices are provided which measure average flow velocity through Doppler shift of the fluid as well as cross sectional multiphase fluid composition in pipe or tubing conduits. Multiple tomographic arrays in conjunction with correlation of sensed flow patterns in time provided determination of flow velocity as well as cross sectional multiphase fluid composition. The tomographic arrays may be arranged in a skewed or slanted plane to measure velocity fluctuations downstream of a vortex shedding device where the period and amplitude of the fluctuations is correlated with the mass flow of the fluid. Additionally, the tomographic arrays provide the relative composition of the multiphase fluid. The multiple arrays together with correlation to determine velocity fluctuations downstream of a vortex shedding device where the period and amplitude of the fluctuations is correlated with the mass flow of the fluid. Additionally the tomographic arrays output the relative composition of the multiphase fluid.

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.

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 using ultrasound waveform tomography with a wave-energy-based preconditioning method for improved ultrasound tomography imaging.

A portable mechanical high-precision device for performing circular or helical scanning of a patient's organ or body surface for tissue diagnosis and / or treatment includes a substantially hollow housing for accommodating the organ therein and a securing unit for securing the housing to the organ or body surface during scanning so that the organ or body surface is substantially fixed relative to the housing. At least one drive unit is attached to the housing and to at least one scan head for allowing unlimited rotation of the scan head relative to the housing.

An imaging tomography apparatus, in particular an x-ray tomography apparatus or an ultrasound tomography apparatus, has a stationary unit (1) with a measurement unit (13) for measurement of an out-of-balance condition, on which stationary unit is mounted an annular measurement device (3) rotatable around a patient tunnel (9). Compensation weights (16a and 16b) for compensation of the out-of-balance condition are provided on the measurement device (3). To simplify the balancing procedure, the compensation weights (16a and 16b) are fashioned in the form of two compensation rings (15a and 15b) surrounding the patient tunnel (9) and with respectively defined out-of-balance conditions. The compensation rings (15a and 15b) are mounted on the measurement device such that they can be varied with regard to their relative positions in two parallel planes (E1 and E2) axially separated from one another.

The invention discloses an integrated type capacitance-ultrasound tomography sensor in the technical field of sensor design. The sensor comprises a capacitance tomography sensor and an ultrasound tomography sensor, wherein the capacitance tomography sensor comprises one or more measuring electrode modules, and the ultrasound tomography sensor consists of an ultrasonic transducer array. The sensor surrounds a space to be measured, the measuring part of the capacitance tomography sensor is used for measuring the distribution of dielectric coefficients in the space, and meanwhile, the measuring part of the ultrasound tomography sensor is used for measuring the distribution of ultrasound propagation velocity of a section to be measured. The sensor can provide measured capacitance signals and ultrasound signals at the same time, and the flame distribution image of the space to be measured is reconstructed by virtue of the capacitance signals and the ultrasound signals through a unified image reconstruction algorithm.

The invention relates to an ultrasound tomography method mixed with transmission and reflecting modalities. The ultrasound tomography method mixed with the transmission and reflecting modalities is used for reconstruction and visual representation of two-phase medium distribution in a measured object field. The ultrasound tomography method mixed with transmission and reflecting modalities comprises the steps that a time-varying ultrasonic signal is received; the obtained ultrasonic time-varying signal is demodulated by a digital orthogonality multiplication, and thus an orthogonality demodulated result is obtained; a boundary voltage measurement valve is obtained, and the corresponding time of the boundary voltage measurement valve is the demodulated transition time; the distance between adispersed phase medium boundary point and an ultrasonic transducer is calculated, and an ultrasonic reflecting constraint equation is established; the amplitude attenuation of an ultrasonic transducer receiving signal under the transmission modality is calculated; and the reconstruction result of the transmission and reflecting double-modality images are calculated.

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.

The invention belongs to the field of ultrasound imaging large data volume processing and discloses an ultrasound tomography calculation optimization method and system based on a distributed system. The method comprises the steps of: preparation: arranging the distributed system comprising X distributed node servers and allowing array elements of a probe to correspond to the appropriate node servers, wherein the quantities of the array elements corresponding to the node servers are equal; and data acquisition and storage: conducting filtration preprocessing on received signals after acquiringall the signals, and conducting image reconstruction, wherein the image reconstruction comprises the steps of independent reconstruction of each node and major node server integration. The method andthe system process the ultrasound signals (acquired by the array elements) received by an ultrasound tomography system by using a distributed cluster system schema and the multinode servers based on aprinciple of a synthetic aperture focusing technique (SAFT), and can solve the problems of large data volume, long image reconstruction time and the like of the ultrasound tomography system.