摘要:
An ultrasonic scanhead including an encoder, a pivot, a voice coil motor, and a transducer is provided. The encoder includes a fixed element and a rotary element. The rotary element is disposed at the fixed element and capable of rotating about a first axis. The pivot is through the encoder and capable of rotating with the rotary element. The pivot extends along a second axis and has a first end and a second end opposite to the first end. The voice coil motor includes a stator and a mover. The first end of the pivot is connected to the mover. The mover is capable of moving linearly along a third axis. The first axis, the second axis, and the third axis are substantially perpendicular to each other. The transducer is disposed at the second end of the pivot and capable of emitting an ultrasonic wave.
摘要:
An exemplary automatic ultrasonic scanning system and a scanning method of the same are disclosed. The automatic ultrasonic scanning system includes a multi-axis robot arm, an ultrasonic scan head disposed on the multi-axis robot arm, a control circuit for controlling the multi-axis robot arm, a three-dimensional image capturing apparatus and a computer. The computer senses a tested object through the three-dimensional image capturing apparatus, creates a three-dimensional shape of the tested object, and plans a three-dimensional scanning path according to the three-dimensional shape. According to the three-dimensional scanning path the computer further controls the multi-axis robot arm to perform a multi-axis motion through the control circuit, so as performs a three-dimensional scan on the tested object through the ultrasonic scan head, and constructs an ultrasonic image according to a reflected ultrasonic signal received by the ultrasonic scan head consequently.
摘要:
An imaging probe is suitable to be inserted into a tubular object so as to detect an interior image of the tubular object. The imaging probe includes a light source excitation assembly, an ultrasonic transducer and a receiver. The light source excitation assembly includes a pulsed laser, a first optical fiber and a cone-shaped reflecting member. The pulsed laser is suitable to generate a pulsed light energy. The cone-shaped reflecting member is suitable to reflect the pulsed light energy to let the pulsed light energy annularly irradiate the inner wall of the tubular object so as to produce a photoacoustic signal. The ultrasonic transducer is suitable to generate an ultrasonic signal. The ultrasonic signal annularly irradiates the inner wall of the tubular object so as to produce an ultrasonic echo signal. The receiver receives the photoacoustic signal and the ultrasonic echo signal.
摘要:
An exemplary ultrasonic diagnostic system includes a portable ultrasonic diagnostic apparatus and a cloud computing system. The portable ultrasonic diagnostic apparatus includes an ultrasonic sensing unit, a front-end circuit, a data compression unit and a communication unit. The ultrasonic sensing unit is configured to sense a signal reflected from a measured object. The front-end circuit is configured to perform a pre-processing on an output of the ultrasonic sensing unit. The data compression unit is configured to receive an output of the front-end circuit and determine whether to perform a data compression process on the output of the front-end circuit according to a selected result. The communication unit is configured to receive an output of the data compression unit and further transmit the output of the data compression unit to the cloud computing system.
摘要:
A probe composite for photoacoustic imaging includes a first probe and the second probe mixed with each other. The first probe includes a first ligand and a first nanorod conjugated to the first ligand. The first ligand specifically interacts with a first target. The second probe includes a second ligand and a second nanorod conjugated to the second ligand. The second ligand specifically interacts with a second target.
摘要:
An ultrasound imaging apparatus and method comprises a transducer array, a positioning device for the array, a reflector, a multiplexer, a transmitter/receiver, an image reconstruction and signal processing apparatus, and a monitor. The transducer array and the reflector are located on two sides of an object which are opposite to each other. Every channel of the transducer array can independently transmit and receive signal, and the reflector is used to reflect the transmitted signal from any channel. Thus, the system can collect the echoes from the reflector for all transmit/receive combinations, and then extract from the echoes the time-of-flight data and the attenuation data necessary for estimating the sound velocities and the attenuation coefficients, respectively. When estimating the sound velocities and the attenuation coefficients of different tissues in an object, the B-mode image is applied to provide the segmentation information of the object in order to improve the estimation accuracy. The invention can be used to obtain the ultrasound B-mode image, the sound velocities, and the attenuation coefficients of an object, and can be extended to obtaining other parameters, such as elastic modulus, with a single apparatus.
摘要:
Ultrasound imaging adapts as a function of a coherence factor. Various beamforming, image forming or image processing parameters are varied as a function of a coherence factor to improve detail resolution, contrast resolution, dynamic range or SNR. For example, a beamforming parameter such as the transmit or receive aperture size, apodization type or delay is selected to provide maximum coherence. Alternatively or additionally, an image forming parameter, such as the number of beams for coherent synthesis or incoherent compounding, is set as a function of the coherence factor. Alternatively or additionally an image processing parameter such as the dynamic range, linear or nonlinear video filter and/or linear or nonlinear map may also adapt as a function of the coherence factor.
摘要:
Methods perform dynamic focusing of a coherent array imaging system are invented. Dynamic focusing in ultrasonic array imaging involves extensive real-time computations and data communication. Particularly for real-time three-dimensional imaging using fully-sampled two-dimensional arrays, implementation of dynamic focusing can be extremely complicated. The invention described in this disclosure greatly simplifies the delay control mechanism by exploiting both spatial and temporal characteristics of the focusing delay patterns. The simplification primarily results from (1) grouping adjacent channels into sub-apertures for the range dependent focusing component, and (2) non-uniform quantization of the delay values.
摘要:
An ultrasonic imaging system including an aberration correction system uses a harmonic component of the fundamental transmitted frequency for imaging, or for aberration correction, or both. By properly selecting the frequency pass bands of filters used in the image signal path and in the aberration correction signal path operating advantages are provided. The aberration correction values may be calculated concurrently with image formation.
摘要:
An ultrasonic imaging system including an aberration correction system uses a harmonic component of the fundamental transmitted frequency for imaging, or for aberration correction, or both. By properly selecting the frequency pass bands of filters used in the image signal path and in the aberration correction signal path operating advantages are provided. The aberration correction values may be calculated concurrently with image formation.