Ultrasound diagnostic apparatus, sound velocity determining method, and recording medium

Patent metadata

Field	Value
Publication number	US-10470746-B2
Application number	US-201514670608-A
Country	US
Kind code	B2
Filing date	Mar 27, 2015
Priority date	Sep 28, 2012
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

In the ultrasound diagnosis, a probe performs transmission of an ultrasonic beam a plurality of times so as to form predetermined transmission focus points, the analog reception data output by the probe is A/D converted to turn into a first element data, a plurality of first element data is used to generate a second element data corresponding to any one of the plurality of first element data, and a sound velocity is determined using the first element data in a case where the position for determining the sound velocity is in a vicinity of the transmission focus point and using the second element data in a case where the position is not in a vicinity of the transmission focus point. In this manner, the sound velocity of the ultrasound waves in an inspection object can be accurately determined without decreasing the frame rate.

First claim

What is claimed is:

1. An ultrasound diagnostic apparatus, which inspects an inspection object sing an ultrasonic beam, comprising:
a probe in which a plurality of elements are arranged, which transmit the ultrasonic beam, receive ultrasonic echoes reflected by the inspection object, and output an analog element signal according to the received ultrasonic echoes;
a transmitter configured to make the probe perform transmission of the ultrasonic beam a plurality of times so as to form predetermined transmission focus points using the plurality of elements; a receiver configured to receive an analog element signal output by the plurality of elements corresponding to the transmission of the ultrasonic beam toward each of the transmission focus points, and carrying out a predetermined process;
an analog-to-digital converter configured to analog-to-digital convert the analog element signal processed by the receiver into first element data which is a digital element signal before performing phasing addition;
a data processor configured to generate second element data which is a digital element signal before performing phasing addition corresponding to any one of a plurality of first element data;
a sound velocity determiner configured to determine a sound velocity of ultrasonic waves in the inspection object using the first element data or the second element data; and
a position determiner configured to determine whether or not a position at which the sound velocity determiner determines the sound velocity is within a predetermined distance from a position of one of the transmission focus points;
an image former configured to form an ultrasound image; and
a display configured to display an ultrasound image formed by the image former,
wherein the sound velocity determiner determines the sound velocity using the first element data in a case where the sound velocity determining position is within the predetermined distance from the one of the transmission focus points according to determination results by the position determiner and determines the sound velocity using the second element data in a case where the sound velocity determining position is not within the predetermined distance from the one of the transmission focus points,
wherein the image former forms the ultrasound image by performing phasing addition for forming the ultrasound image using at least one of the first element data and the second element data using the sound velocity determined by the sound velocity determiner, and
wherein the data processor generates the second element data corresponding to the first element data with one element of interest being a center element being rebuilt by superimposing the plurality of first element data each with a different center element on the first element data with the element of interest being the center element according to a positional difference between center elements, a reception time at which the elements received the ultrasonic echoes and positions of the elements.

2. The ultrasound diagnostic apparatus according to claim 1 , wherein the transmitter makes the probe perform transmission of the ultrasonic beam a plurality of times, changing at least one of a center element and a transmission direction of the ultrasonic beam.

3. The ultrasound diagnostic apparatus according to claim 2 , wherein the data processor generates the second element data using at least one of a plurality of the first element data obtained by transmission of the ultrasonic beam where the center elements are different to each other and a plurality of the first element data obtained by transmission of the ultrasonic beam where the transmission directions are different to each other.

4. The ultrasound diagnostic apparatus according to claim 1 , wherein the data processor generates the second element data from the plurality of first element data obtained by transmission of the ultrasonic beam where transmission regions overlap.

5. The ultrasound diagnostic apparatus according to claim 1 , wherein a measurement region in a subject is divided into a plurality of regions and the sound velocity is determined for each divided region.

6. The ultrasound diagnostic apparatus according to claim 1 , wherein the transmitter performs the transmission of the ultrasonic beam for one sound ray at only one of the transmission focus points when determining the sound velocity.

7. The ultrasound diagnostic apparatus according to claim 1 , further comprising: an element data storage unit which stores all of the first element data corresponding to at least one ultrasound image.

8. The ultrasound diagnostic apparatus according to claim 1 , wherein an ultrasound image is formed using the second element data.

9. An ultrasound image forming method in ultrasound diagnosis using a probe in which a plurality of elements are arranged, which transmit an ultrasonic beam, receive ultrasonic echoes reflected by an inspection object, and output an analog element signal according to the received ultrasonic echoes, the method comprising:
making the probe perform transmission of the ultrasonic beam a plurality of times so as to form predetermined transmission focus points using the plurality of elements when determining a sound velocity of the ultrasonic waves inside an inspection object;
analog-to-digital converting an analog element signal output by the plurality of elements into first element data which is a digital element signal before performing phasing addition corresponding to the individual transmission of the ultrasonic beam corresponding to each of the transmission focus points;
generating, using a plurality of first element data, second element data which is a digital element signal before performing phasing addition corresponding to any one of the plurality of first element data;
determining whether or not a position for determining the sound velocity of the ultrasonic waves in the inspection object is within a predetermined distance from one of the transmission focus points;
determining the sound velocity using the first element data in a case where the position for determining the sound velocity is within the predetermined distance from one of the transmission focus points and determining the sound velocity using the second element data in a case where the position for determining the sound velocity is not within the predetermined distance from one of the transmission focus points; and
forming the ultrasound image by performing phasing addition for forming the ultrasound image using at least one of the first element data and the second element data using the sound velocity determined,
wherein the second element data is element data corresponding to the first element data with one element of interest being a center element being rebuilt and is generated by superimposing the plurality of first element data each with a different center element on the first element data with the element of interest being the center element according to a positional difference between center elements, a reception time at which the elements received the ultrasonic echoes and positions of the elements.

10. The ultrasound image forming method according to claim 9 , wherein the probe performs transmission of the ultrasonic beam a plurality of times, changing at least one of a center element and a transmission direction of the ultrasonic beam.

11. The ultrasound image forming method according to claim 10 , wherein the second element data is generated using either one of or both of the plurality of first element data obtained by transmission of the ultrasonic beam where the center elements are different to each other and the plurality of first element data obtained by

Assignees

• Fujifilm Corp

Inventors

• Yamamoto Hiroaki

Classifications

• A61B8/0858

  involving measuring tissue layers, e.g. skin, interfaces · CPC title

• A61B8/14

  Echo-tomography · CPC title

• A61B8/5207

  involving processing of raw data to produce diagnostic data, e.g. for generating an image · CPC title

• A61B8/5269 Primary

  involving detection or reduction of artifacts · CPC title

• G01S7/52049

  using correction of medium-induced phase aberration · CPC title