Back to results
US 12,551,192 B2Granted
Ultrasonic diagnostic apparatus and medical image processing apparatus
AssigneeCanon Medical Systems Corporation
InventorTakeshi Sato
Life of this patent
Estimating the term…
Abstract
An ultrasonic diagnostic apparatus of embodiment includes a receiver circuit and processing circuitry. The receiver circuit performs a first process of multiplying a gain to a received signal in analog form while changing the gain with depth, and performs a second process of converting the received signal subjected to the first process into a received signal in digital form. The processing circuitry performs a third process on the received signal in digital form so that a level of noise included in the received signal in digital form is made constant, and performs a fourth process of reducing the noise included in the received signal on the received signal in digital form subjected to the third process.
Claims9
An ultrasonic diagnostic apparatus comprising:
- a receiver circuit configured to perform a first process of multiplying a gain by a received signal in analog form while changing the gain with depth, and to perform a second process of converting the received signal subjected to the first process into a received signal in digital form;
- and
- processing circuitry configured to perform a third process on the received signal in digital form so that a level of noise included in the received signal in digital form is made spatially uniform by performing a process of multiplying the received signal in digital form by a gain opposite to the gain that changes with depth in the first process, to perform a fourth process of reducing spatially and uniformly the level of the noise included in the received signal on the received signal in digital form subjected to the third process, and to perform a fifth process of multiplying a gain by the received signal from which the noise is reduced by the fourth process, wherein
- the processing circuitry, as the fourth process,
- inputs the received signal in digital form subjected to the third process to a neural network trained to, in response to an input of an additive signal which is acquired by adding a noise signal including noise, a level of the noise included in the noise signal being spatially uniform and the neural network assuming that noise included in a signal input to the neural network is spatially uniform, to a signal including no noise, output a signal corresponding to the noise signal,
- acquires a signal corresponding to the noise signal from the neural network, and
- reduces spatially and uniformly the level of the noise included in the received signal in digital form subjected to the third process by subtracting the acquired signal from the received signal in digital form subjected to the third process.
4 more elements
A medical image processing apparatus comprising:
- processing circuitry configured to acquire a received signal in digital form converted from a received signal in analog form subjected to a first process of multiplying a gain while changing the gain with depth, to perform a second process on the received signal in digital form so that a level of noise included in the received signal in digital form is made spatially uniform by performing a third process of multiplying the received signal in digital form by a gain opposite to the gain that changes with depth, to perform a fourth process of reducing spatially and uniformly the level of the noise included in the received signal on the received signal in digital form subjected to the second process of making the level of the noise spatially uniform, and to perform a fifth process of multiplying a gain by the received signal from which the noise is reduced by the fourth process of the reducing the noise, wherein
- the processing circuitry, as the fourth process,
- inputs the received signal in digital form subjected to the second process to a neural network trained to, in response to an input of an additive signal which is acquired by adding a noise signal including noise, a level of the noise included in the noise signal being spatially uniform and the neural network assuming that noise included in a signal input to the neural network is spatially uniform, to a signal including no noise, output a signal corresponding to the noise signal,
- acquires a signal corresponding to the noise signal from the neural network, and
- reduces spatially and uniformly the level of the noise included in the received signal in digital form subjected to the second process by subtracting the acquired signal from the received signal in digital form subjected to the second process.
2 more elements
An ultrasonic diagnostic apparatus comprising:
- a receiver circuit configured to perform a first process of multiplying a gain by a received signal in analog form while changing the gain with depth, and to perform a second process of converting the received signal subjected to the first process into a received signal in digital form;
- and
- processing circuitry configured to perform a third process on the received signal in digital form so that a level of noise included in the received signal in digital form is made constant, and to perform a fourth process of reducing the noise included in the received signal on the received signal in digital form subjected to the third process, wherein
- as the third process, the processing circuitry further performs a process of making the level of the noise included in the received signal in digital form constant in all channels and at all depths, based on variations in sensitivity between channels.
1 more element
An ultrasonic diagnostic apparatus comprising:
- a receiver circuit configured to perform a first process of multiplying a gain by a received signal in analog form while changing the gain with depth, and to perform a second process of converting the received signal subjected to the first process into a received signal in digital form;
- and
- processing circuitry configured to perform a third process on the received signal in digital form so that a level of noise included in the received signal in digital form is made constant, and to perform a fourth process of reducing the noise included in the received signal on the received signal in digital form subjected to the third process, wherein
- as the fourth process, the processing circuitry divides the received signal in digital form subjected to the third process into a plurality of regions, performs a predetermined orthogonal transform on each of the regions to acquire a plurality of frequencies corresponding to each of the regions, uses the frequencies corresponding to each of the regions as length data of data input to a neural network, and performs an inverse transform of the predetermined orthogonal transform on output of the neural network.
1 more element
Dependencies are inferred from the claim text.