摘要:
A three-dimensional image of flowing fluid or moving tissue using velocity or power Doppler data is displayed by using an ultrasound scanner that collects velocity or power data in a cine memory to form a volume of pixel data. Average or median pixel values are projected (86) on an image plane by casting rays through the data volume. As the ray passes through each scan plane, a data value is assigned to the ray at that point. At each scan plane, the assigned pixel data value is tested (88) to see if it exceeds a noise threshold. For a given ray, pixel data values above the detection threshold are accumulated (90) until a pixel data value falls below the detection threshold (92). A minimum number of pixel data values exceeding the threshold are required for each ray before the average of the accumulated values is processed and/or the median value is selected (94). When all pixels along a given ray have been tested, the projection is complete and the average or median projection is then displayed. Uniformity within the projected image and the sharpness of edges are enhanced by projecting average or median pixel values instead of maximum pixel values.
摘要:
An ultrasound color flow imaging system is programmed to optimize display images on a display monitor (18) by automatically adjusting a threshold. B-mode data corresponding to valid color data is subjected to statistical analysis including mean and standard deviation (S3). The threshold is computed according to mean plus k (standard deviation), where k preferably is based on a linear regression equation.
摘要:
A storing method of a RF ultrasound pulse echo and a medical digital ultrasonic imaging apparatus capable of re-using the stored RF ultrasound pulse echo store and focus each RF ultrasound pulse echo received from a plurality of transducer elements in order to implement an ultrasonic image of at least one frame. Then, the stored RF ultrasound pulse echoes are analyzed, to thereby control the system according to the analysis result, which results in implementation of an optimal ultrasonic image.
摘要:
An ultrasonic diagnostic imaging system processes echo information signals by means of a dynamic range map for displayed signals which is varied automatically throughout the image to control the displayed dynamic range and noise rejection level in regions of the image. In a preferred embodiment the displayed dynamic range and noise rejection level is varied with both the range (depth) and lateral (scanline to scanline) dimensions of an ultrasonic image.
摘要:
A portable ultrasound imaging system (10) includes a scan head (12) coupled by a cable (16) to a portable battery-powered data processor (14) and display unit. The scan head enclosure (12) houses an array of ultrasonic transducers and the circuitry associated therewith, including pulse synchronizer circuitry used in the transmit mode for transmission of ultrasonic pulses and beam forming circuitry used in the receive mode to dynamically focus reflected ultrasonic signals returning from the region of interest being imaged.
摘要:
Procédé pour le traitement de signaux représentatifs d'ondes réfléchies ou transmises par un objet (O), en vue d'effectuer une analyse de la structure de cet objet (O), ce procédé comprenant l'émission d'ondes incidentes dans ladite structure, la réception des ondes réfléchies ou transmises par les structures rencontrées par l'onde incidente à l'intérieur de l'objet (O), par une pluralité d'éléments de détection (D 1 , D n ) indépendants les uns des autres, la mémorisation après numérisation des informations reçues dans une mémoire de champ (MC), le calcul, pour chaque point (Pij) de l'objet (O), des positions occupées dans la mémoire de champ par les signaux détectés par les éléments (D 1 , D n ) à un instant donné et correspondant aux ondes réfléchies ou transmises par le point (Pij), puis l'application sur l'ensemble des informations contenues dans la mémoire de champ, relatives à chaque point (Pij), d'opérations dont le résultat (Vp) permet de connaître l'importance de l'onde réfléchie ou transmise par le point (Pij).
摘要:
Ultrasonic wave is emitted into an examined body. A first electric echo signal is generated in response to an echo of the ultrasonic wave. A controllable filter responsive to a control signal serves to extract components of the first electric echo signal which are in a desired frequency band, so that the first electric echo signal is converted into a second electric echo signal. A logarithmic detection device serves to subject the second electric echo signal to logarithmic compression and detection. A signal generator is operative for outputting plural calibration signals having different frequencies and different amplitudes. An input selection device is operative for connecting the signal generator with an input terminal of the filter during a calibration mode of operation. A control device is operative for calculating a corrective value from an output signal of the logarithmic detection device during the calibration mode of operation, and correcting a logarithmic conversion characteristic and an offset of the logarithmic detection device and the control signal to the filter in response to the calculated corrective value during reception of echoes of the ultrasonic wave.
摘要:
Convolution calculation is executed on the basis of a calculation result from an impulse response calculation unit (10), (11), ... (1n) using a peak value of each pulse as a multiplier and an estimated value of an unknown impulse response as a multiplicand and using a transmission waveform as a pulse train, and the difference from a reception waveform is calculated by a difference calculation unit (3). Correction of the estimated impulse response is made at a correction unit (10a), (11a), ... (1na) of the impulse response calculation unit (10), (11), ... (1n) on the basis of the calculated difference, and the corrected impulse response is supplied to an input response calculation unit of a next stage. When these processings are executed, high resolution of inspection as well as real time processing can be accomplished, and moreover, the range of inspection can be expanded while keeping resolution at a high level.