Information processing apparatus, information processing method, and storage medium

A method for an information processing apparatus, the method comprising:

• acquiring a plurality of pieces of image data generated by performing a plurality of ultrasonic wave transmission and reception operations on a subject, while changing an ultrasonic wave transmission and reception mode;
• acquiring a plurality of pieces of template data corresponding to the plurality of ultrasonic wave transmission and reception operations, respectively;
• and
• acquiring information indicating a similarity between an image value sequence of the plurality of pieces of image data at a target position and a template data sequence of the plurality of pieces of template data at the target position,
• wherein acquiring information includes calculating, as the acquired information indicating the similarity between the image value sequence and the template data sequence, a correlation based on the following expression (1):
• R
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• )
• =
• ∑
• i
• =
• 1
• N
• ⁢
• (
• P
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• ,
• i
• )
• ×
• α
• ⁡
• (
• xi
• ,
• yi
• ,
• zi
• )
• )
• ∑
• i
• =
• 1
• N
• ⁢
• P
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• ,
• i
• )
• 2
• ×
• ∑
• i
• =
• 1
• N
• ⁢
• α
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• ,
• i
• )
• 2
• (
• 1
• )
• where coordinates of the target position are represented by (X, Y, Z), a number of each of the plurality of ultrasonic wave transmission and reception operations is represented by i (i=1 to N), information indicating the correlation is represented by R, an image value included in the image value sequence is represented by P, and template data included in the template data sequence is represented by a.

A non-transitory computer-readable storage medium storing a program to cause a computer to perform a method for an information processing apparatus, the method comprising:

• acquiring a plurality of pieces of image data generated by performing a plurality of ultrasonic wave transmission and reception operations on a subject, while changing an ultrasonic wave transmission and reception mode;
• acquiring a plurality of pieces of template data corresponding to the plurality of ultrasonic wave transmission and reception operations, respectively;
• and
• acquiring information indicating a similarity between an image value sequence of the plurality of pieces of image data at a target position and a template data sequence of the plurality of pieces of template data at the target position,
• wherein acquiring information includes calculating, as the acquired information indicating the similarity between the image value sequence and the template data sequence, a correlation based on the following expression (1):
• R
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• )
• =
• ∑
• i
• =
• 1
• N
• ⁢
• (
• P
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• ,
• i
• )
• ×
• α
• ⁡
• (
• xi
• ,
• yi
• ,
• zi
• )
• )
• ∑
• i
• =
• 1
• N
• ⁢
• P
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• ,
• i
• )
• 2
• ×
• ∑
• i
• =
• 1
• N
• ⁢
• α
• ⁡
• (
• X
• ,
• Y
• ,
• Z
• ,
• i
• )
• 2
• (
• 1
• )
• where coordinates of the target position are represented by (X, Y, Z), a number of each of the plurality of ultrasonic wave transmission and reception operations is represented by i (i=1 to N), information indicating the correlation is represented by R, an image value included in the image value sequence is represented by P, and template data included in the template data sequence is represented by α.