3D perspective indicator and generation method therefor and application thereof

1. A method for generating a 3D perspective indicator in a CT imaging system, the method comprising:

generating an upper boundary plane and a lower boundary plane perpendicular to a scanning direction and an auxiliary plane perpendicular to the upper boundary plane and the lower boundary plane in a coordinate system space of the CT imaging system, the auxiliary plane being located above a to-be-scanned region of a patient; and

identifying an upper contour line intersecting the upper boundary plane and a lower contour line intersecting the lower boundary plane in a point cloud generated based on a depth image of the patient;

wherein the 3D perspective indicator comprises the upper contour line and the lower contour line, the upper boundary plane and the lower boundary plane, and the auxiliary plane.

2. The method according to claim 1 , further comprising extracting a patient structure model from the point cloud, the upper contour line and the lower contour line being respectively intersecting lines of the patient structure model with the upper boundary plane and the lower boundary plane.

3. The method according to claim 2 , further comprising generating a main reference plane parallel to the auxiliary plane in the coordinate system space of the CT imaging system, the patient structure model being on the main reference plane and, together with the main reference plane, defining a shape of the to-be-scanned region.

4. The method according to claim 3 , wherein the main reference plane is generated on a top surface of a scanning table.

5. The method according to claim 3 , wherein the upper contour line and/or lower contour line intersects the main reference plane at upper boundary reference points and/or lower boundary reference points, and the upper contour line and/or the lower contour line matches a contour of the to-be-scanned region of the patient.

6. The method according to claim 5 , wherein the upper boundary reference points and/or the lower boundary reference points are two reference points across the patient structure model, and a distance therebetween is greater than a maximum width of the patient structure model.

7. The method according to claim 6 , further comprising forward-projecting the two upper boundary reference points and/or two lower boundary reference points onto the auxiliary plane to obtain two upper boundary auxiliary points and/or two lower boundary auxiliary points.

8. The method according to claim 1 , wherein the upper boundary plane and the lower boundary plane are capable of separately moving or simultaneously moving in the scanning direction.

9. The method according to claim 8 , wherein when the upper boundary plane and/or the lower boundary plane moves in the scanning direction, the upper contour line and/or the lower contour line changes in real time with the to-be-scanned part region of the patient.

10. The method according to claim 9 , wherein the real-time change is continuous.

11. A 3D perspective indicator for a CT imaging system, comprising:

an upper boundary plane and a lower boundary plane, which are in a coordinate system space of the CT imaging system and perpendicular to a scanning direction;

an auxiliary plane being in the coordinate system space of the CT imaging system and perpendicular to the upper boundary plane and the lower boundary plane, the auxiliary plane being located above a to-be-scanned region of a patient; and

an upper contour line and a lower contour line, which are located in a point cloud generated based on a depth image of the patient and respectively intersect the upper boundary plane and the lower boundary plane.

12. A method for controlling a scanning range in a CT imaging system, the method comprising:

generating a 3D perspective indicator in the CT imaging system; and

controlling a scanning range using the 3D perspective indicator, the 3D perspective indicator including an upper contour line and a lower contour line, an upper boundary plane and a lower boundary plane, and an auxiliary plane representing the scanning range, wherein a region between the upper boundary plane and the lower boundary plane comprises the to-be-scanned region of the patient.

13. The method according to claim 12 , wherein the scanning range is displayed through a display unit, and the scanning range is controlled by translating the upper boundary plane and/or the lower boundary plane up and down in the scanning direction on the display unit.

14. The method according to claim 12 , wherein the scanning range is displayed through a display unit, and the scanning range is controlled by setting on the display unit at least one of the two upper boundary auxiliary points and/or at least one of the two lower boundary auxiliary points and/or any point in a connection line of the two upper boundary auxiliary points and/or any point in a connection line of the two lower boundary auxiliary points.

15. The method according to claim 12 , wherein the scanning range is displayed through a display unit, and the entire scanning range is controlled to translate up and down in the scanning direction by controlling on the display unit a connection line between the upper boundary auxiliary point and a corresponding lower boundary auxiliary point on the same side or any point in the connection line.

16. An apparatus for controlling a scanning range in a CT imaging system, the apparatus comprising:

a display unit, configured to display a scanning range represented by an upper contour line and a lower contour line, an upper boundary plane and a lower boundary plane, and an auxiliary plane; and

a control unit, configured to:

generate an upper boundary plane and a lower boundary plane perpendicular to a scanning direction and an auxiliary plane perpendicular to the upper boundary plane and the lower boundary plane in a coordinate system space of the CT imaging system, the auxiliary plane being located above a to-be-scanned region of a patient; and

identify an upper contour line intersecting the upper boundary plane and a lower contour line intersecting the lower boundary plane in a point cloud generated based on a depth image of the patient;

wherein a region between the upper boundary plane and the lower boundary plane comprises the to-be-scanned region of the patient.

17. The apparatus according to claim 16 , wherein the control unit is further configured to control the scanning range by translating the upper boundary plane and/or the lower boundary plane up and down in the scanning direction on the display unit.

18. The apparatus according to claim 17 , wherein when the control unit controls the upper boundary plane and/or the lower boundary plane to move in the scanning direction, the upper contour line and/or the lower contour line changes in real time with the to-be-scanned region of the patient.

19. The apparatus according to claim 18 , wherein the real-time change is continuous.