Image display methods

Patent metadata

Field	Value
Publication number	US-9805504-B2
Application number	US-201514711949-A
Country	US
Kind code	B2
Filing date	May 14, 2015
Priority date	May 14, 2014
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

The present disclosure discloses an image display method in a CT system. The method comprises: implementing CT scanning on an inspected object, to obtain CT projection data; organizing the CT projection data according to a predetermined interval; extracting basic data from the organized CT projection data by using a fixed angle as a start angle and using 360 degrees as an interval; forming a DR image based on the extracted basic data; reconstructing a three-dimensional image of the inspected object from the CT projection data; and displaying the DR image and the reconstructed three-dimensional image on a screen at the same time. In the solution, the CT data is processed to obtain DR data. After the DR data is obtained, a DR image is obtained directly using a DR data processing algorithm. This enables an image recognizer to more accurately and more rapidly inspect goods carried by a passenger using the existing experience in image recognition of the DR image.

First claim

We claim:

1. An image display method in a Computed Tomography (CT) system, comprising steps of:
implementing CT scanning on an inspected object, to obtain CT projection data;
organizing the CT projection data according to a predetermined interval;
extracting basic data from the organized CT projection data by using a fixed angle as a start angle and using 360 degrees as an interval;
forming a Digital Radiography (DR) image based on the extracted basic data;
reconstructing a three-dimensional image of the inspected object from the CT projection data; and
displaying the DR image and the reconstructed three-dimensional image on a screen at the same time.

2. The image display method according to claim 1 , further comprising steps of:
extracting complementary data from the organized CT projection data by using the fixed angle plus 180 degrees as the start angle and using 360 degrees as the interval;
storing the extracted complementary data in a matrix;
implementing a left-right mirror image process on the matrix;
alternatively inserting the complementary data in the processed matrix into the basic data in units of rows, to obtain complemented basic data; and
forming the DR image based on the complemented basic data.

3. The image display method according to claim 1 , further comprising steps of:
extracting basic data from the organized CT projection data by using another fixed angle as a start angle and using 360 degrees as an interval;
forming another DR image based on the extracted basic data; and
displaying the DR image, the another DR image, and the reconstructed three-dimensional image on the screen at the same time.

4. The image display method according to claim 1 , the step of organizing the CT projection data according to a predetermined interval comprises:
when a sampling frequency is higher than one data projection per predetermined interval, adjusting the sampling frequency of the CT projection data as one data projection per predetermined interval according to a sub-sampling rule; and
when the sampling frequency is lower than one data projection per predetermined interval, adjusting the sampling frequency of the CT projection data as one projection data per predetermined interval according to linear interpolation.

5. The image display method according to claim 1 , when the basic data is high-energy data and low-energy data, the basic data is processed according to a material recognition algorithm to obtain gray-level data and material data.

6. The image display method according to claim 1 , wherein the DR image is interpolated to achieve a resolution required by a user and the interpolated DR image is displayed on the screen.

7. The image display method according to claim 1 , wherein data of the reconstructed three-dimensional image is one of physical density data, electron density data, atomic number data, high-energy data, low-energy data, gray-level data, and material data.

8. An image display method in a Computed Tomography (CT) system, comprising steps of:
implementing CT scanning on an inspected object to obtain CT projection data;
reconstructing a three-dimensional image of the inspected object from the CT projection data;
projecting data of the three-dimensional image H(x,y,z) of the inspected object in a certain angle of view, to obtain Digital Radiography (DR) data in the angle of view, wherein the data of the three-dimensional data H(x,y,z) has a dimensional size of X×Y×Z, a dimension X changes from 1 to X in a direction perpendicular to movement of a belt in a horizontal plane, a dimension Y changes from 1 to Y in a straight-up direction, and a dimension z changes from 1 to Z in a direction along the movement of the belt in the horizontal plane;
forming a DR image based on the DR data in the angle of view; and
displaying the DR image and the three-dimensional image on a screen at the same time.

9. The image display method according to claim 8 , further comprising steps of:
projecting data of the three-dimensional image H(x,y,z) of the inspected object in another angle of view, to obtain DR data in the angle of view;
forming a DR image based on the DR data in the another angle of view; and
displaying two DR images and the three-dimensional image on the screen at the same time.

10. The image display method according to claim 8 , wherein the angle of view and the another angle of view are selected from a direction perpendicular to the movement of the belt in a horizontal plane, the straight-up direction, and the direction along the movement of the belt in the horizontal plane.

11. The image display method according to claim 8 , wherein the three-dimensional data H(x,y,z) is projected along the direction of the dimension x according to the following projection equation, to obtain two-dimensional data I(y,z):

I
⁡

(

y
,
z

)

=

∑

x
=
1

X

⁢

H
⁡

(

x
,
y
,
z

)

the two-dimensional data is DR data in a side angle of view, and the data dimensional size is Y×Z.

12. The image display method according to claim 8 , wherein the three-dimensional data H(x,y,z) is projected along the direction of the dimension y according to the following projection equation, to obtain two-dimensional data J(x,z):

J
⁡

(

x
,
y

)

=

∑

y
=
1

Y

⁢

H
⁡

(

x
,
y
,
z

)

the two-dimensional data is DR data in a bottom or top angle of view, and the data dimensional size is X×Z.

13. The image display method according to claim 8 , wherein the three-dimensional data H(x,y,z) is projected along the direction of the dimension z, i.e., the movement of the belt, according to the following projection equation, to obtain two-dimensional data K(x,y):

K
⁡

(

x
,

Assignees

• Nuctech Co Ltd

Inventors

• Zhang Li
• Chen Zhiqiang
• Huang Qingping
• Sun Yunda
• Tang Zhi
• Shen Le
• Tang Hu
• Ren Qianlu
• Jin Xin

Classifications

• A61B6/466

  adapted to display 3D data · CPC title

• A61B6/032

  Transmission computed tomography [CT] · CPC title

• A61B6/5205

  involving processing of raw data to produce diagnostic data · CPC title

• G06T2211/436

  Limited angle · CPC title

• G06T2207/30004

  Biomedical image processing · CPC title