TW201912112A - Local three-dimensional image forming system and method thereof capable of reducing dosage of X-ray exposure agent - Google Patents

Abstract

The present invention provides a local three-dimensional image forming system and a method thereof, which generate movement of coordinate positions of an X-ray image generation module by comparing a first reference image and a second reference image generated by a first reference axis and a second reference axis, so as to achieve the purposes for implementing X-ray local three-dimensional image photography for an object and further reducing the dosage of X-ray exposure agent.

Description

 Local three-dimensional image forming system and method thereof  

The present invention relates to a three-dimensional image forming system and method thereof, and more particularly to a partial three-dimensional image forming system and method for using the X-ray scanning object to position a local image center of the object.

Computed Tomography (CT) is an X-ray source that penetrates an object to be tested and receives X-rays at various angles to reconstruct an image of the object to be tested. The computed tomography device is applied to medical imaging diagnosis and can be divided into computerized tomography (commonly known as Medlcal CT) for general medical use and computed tomography (referred to as Dental CT) for dental surgery.

The medical tomography scans for medical use are mainly built in large medical institutions, which are suitable for large-scale scanning of the whole body. The user lies on the platform and performs X-ray scanning on the supine or front neck back. While the computerized tomography machine moves on the platform, the X-ray image generation module rotates the platform in a circular trajectory to form a continuous spiral spiral path (Spiral Trajectory), and each image is divided into multiple images. The medical tomography method uses a radiating fan-shaped X-beam (Fan Beam) to extract the beam through the opposite single-row image reading device and generate a series of continuous slice cross-sectional images.

Computerized tomography for dental surgery, currently using Cone Beam Computed Tomography, is applied to the treatment of dental implants. This is to accurately place dental implants, so to ensure smooth operation before surgery. For the implant area, the evaluation of the bone type is very important. In order to ensure the correctness of the shooting position, the patient must use the articulator at the time of shooting to ensure the correct position of the shooting position, so it is troublesome to use. .

Please refer to FIG. 1 , which is a schematic diagram of an X-ray image forming system of No. 102100265. As shown in the figure, the device comprises: a photographing device 11 , an image processing unit 12 , a control unit 13 and a driving device 14 . The photographing device 11 performs object photographing along a reference axis and generates a reference image; the image processing unit 12 positions the feature point and the reference axis center position, and calculates the imaging axis center point of the X-ray image. And the offset of the reference axis center point, the control unit 13 converts the offset into a drive command to cause the driving device 14 to actuate, causing the X-ray source 131, the stage 132 to fix the object, and the X The imaging axis of the ray imaging module 133 is aligned with the photographic device 11 to capture the reference axis of the object.

Since the above method is used, the imaging picture is defined as four quadrants as shown in FIG. 2, and in each of the quadrants, a first quadrant feature point 21, a second quadrant feature point 22, and a third quadrant feature are respectively disposed. Point 23 and fourth image feature point 24, the photographic device performs object shooting along the reference axis, when the object appears in the third quadrant of the picture and generates a reference image, and performs the object feature point 25 and the reference axis (x0, Y0) positioning, moving the X-axis and Y-axis directions, and causing the object feature point 25 to enter the reference axis (x0, y0) position, as shown in FIG. 3, however, the positioning method is at the periphery of the object. Because the camera rotates, the object will leave the center of the camera. At this time, the center position of the object must be calibrated again, and the scanning must be performed in a large-scale manner. The scanning operation cannot be performed for a small target. More X-ray exposure agents.

In view of the above disadvantages of the prior art, the main object of the present invention is to provide a partial three-dimensional image forming system and a method thereof, and input the reference image into an image processing unit to calculate the object by comparing the first reference image and the second reference image. The local rotation center coordinates, and the calculated position information is transmitted to the positioning system, so as to drive the positioning system to drive the actuation module to move the X-ray image generation module to the coordinates according to the coordinate value, thereby achieving the X-ray of the object The purpose of 3D image photography.

Still another object of the present invention is to provide a partial three-dimensional image forming system and method thereof for reducing the use of X-ray exposure agents through the use of a mask.

To achieve the above object, the present invention provides a partial three-dimensional image forming system and method thereof for performing X-ray images by comparing a first reference image and a second reference image generated by a first reference axis and a second reference axis. The position of the module coordinate is generated to achieve the X-ray partial three-dimensional image photography of the object, and further reduce the use of the X-ray exposure agent.

11‧‧‧Photographing device

12‧‧‧Image Processing Unit

13‧‧‧Control unit

14‧‧‧ drive

131‧‧‧X-ray source

132‧‧‧ stage

133‧‧‧X-ray imaging module

21‧‧‧First-limit feature points

22‧‧‧second limit feature point

23‧‧‧3rd limit feature point

24‧‧‧4th limit feature point

41‧‧‧ Positioning system

42‧‧‧X-ray image generation module

43‧‧‧Processing module

411‧‧‧Activity Module

412‧‧‧ platform

4111‧‧‧Support institutions

4112‧‧‧Drive unit

421‧‧‧X-ray generator

422‧‧‧X-ray image generating device

423‧‧‧ mask

431‧‧‧Drive Control Unit

432‧‧‧Image Processing Unit

T1‧‧‧first reference axis

T2‧‧‧second reference axis

O‧‧‧ Rotation Center

P‧‧‧ Object Center

A1, B1‧‧‧X light generating device

A2‧‧‧First Imaging Center

B2‧‧‧Second Imaging Center

A3‧‧‧First imaging position

B3‧‧‧Second imaging position

△1‧‧‧A2 to A3 distance

△2‧‧‧B2 to B3 distance

θ‧‧‧Rotation angle

C‧‧‧X-ray image generating device

S1~S2‧‧‧ imaging method steps

Distance of the R1‧‧‧X optical image generating device to the center of rotation

R2‧‧‧X light generating device to the center of rotation

Figure 1 is a schematic diagram of the X-ray image forming system of No. 102100265.

Figures 2 and 3 are schematic diagrams of the operation of X-ray image forming system No. 102100265.

Figure 4 is a schematic view of a partial three-dimensional image forming system of the present invention.

Figures 5 and 6 are schematic views of the operation of the partial three-dimensional image forming system of the present invention.

Figure 7 is a schematic view showing the steps of a partial three-dimensional image forming method of the present invention.

The embodiments of the present invention are described below by way of specific examples, and those skilled in the art can understand the other advantages and advantages of the present invention from the disclosure.

Please refer to FIG. 4 , which is a schematic diagram of a partial three-dimensional image forming system of the present invention. As shown in the figure, the system includes a positioning system 41 , an X-ray image generating module 42 and a processing module 43 . The positioning system 41 has the same consistency. The movable module 411 and the platform 412 further include a supporting mechanism 4111 and a driving unit 4112 for driving the supporting mechanism 4111. The X-ray image generating module 42 has a supporting mechanism 4111. The X-ray generating device 421 of the side, and the X-ray image generating device 422 disposed on the X-ray generating device 421 side of the supporting mechanism 4111, the processing module 43 has a driving control unit 431 and an image processing unit 432. The driving unit 431 is a servo motor, and the driving unit 4112 is driven by the driving control unit 431 to cause the driving unit 4112 to generate a corresponding action, and the supporting mechanism 4111 is moved or rotated to generate an angular offset. The X-ray image generation module 42 scans the object with a first reference axis T1 and a second reference axis T2 after the rotation angle to generate a first reference image and a second reference image. The reference image input image processing module 43 calculates the rotation center coordinates of the object, and transmits the calculated position information to the positioning system 41, thereby driving the positioning system 41 to drive the actuation module 411 to generate the X-ray image according to the coordinate value. The device 421 is moved to the coordinate, wherein the X-ray image generating device 422 has a mask 423, and the cone angle of the X-ray ray of the X-ray image generating device 422 is changed to a required range by the mask 423, and is executed. The X-ray image of each angle is imaged, and the data is transmitted to the image processing unit 432 for image processing to achieve a partial three-dimensional image of the object, thereby further reducing the X-ray exposure dose.

5 is a schematic diagram of the steps of the partial 3D image forming method of the present invention. As shown in the figure, step 1 (S1): providing a positioning system with an actuation module and a platform, and placing an object on the platform. Step 2 (S2): providing an X-ray image generating module having an X-ray generating device and an image reading device, and transmitting, by the X-ray image generating device, the first reference axial scan of the object, and reading the image The device generates a first reference image of the object, and then generates an angular offset through the driving unit, and then uses the X-ray image generating module to perform a second reference axial scan of the object to obtain a second reference image of the object, and input the reference image. The image processing unit calculates a rotation center coordinate of the object, and transmits the calculated position information to the positioning system, so as to drive the positioning system to drive the actuation module to move the X-ray image generation module to the coordinate according to the coordinate value, and The mask emits a cone angle of the X-ray image of the X-ray image generating device to a required range, performs a series of X-ray image imaging at each angle, and transmits the data to the image processing unit. Line image processing, in order to achieve local production of three-dimensional image of the object, and further to reduce the exposure dose of X-rays.

Please refer to FIG. 6 to FIG. 10 for a schematic diagram of the implementation steps of the partial three-dimensional image forming method of the present invention, and the steps thereof are as follows:

Step 1: providing an X-ray generating device A1, the A1 passes through the rotating center O to the X-ray image generating device C with a first reference axis T1 (not shown) to form an X-ray image first imaging center A2, the X-ray The generating device A1 forms a first imaging position A3 of the X-ray image through the object P point to the X-ray image generating device C, and obtains a first reference image of the object, wherein the first imaging center A2 and the first imaging position A3 The distance is Δ1; the distance from the X-ray image generating device C to the rotation center O is R1, and the distance from the X-ray generating device A1 to the rotation center O is R2, and the distance R1 does not need to be equal to the distance R2. It is assumed in the embodiment that R1 is equal to R2 (as shown in Fig. 6).

Step 2: The X-ray generating device B1 and the X-ray image generating device C are rotated by an angle θ, and the X-ray generating device B1 passes the rotating center O to the X-ray image generating device with a second reference axis T2 (not shown). C, forming an X-ray image second imaging center B2, the X-ray generating device B1 forms an X-ray image second imaging position B3 through the object center P point to the X-ray image generating device C, and obtains a second reference image of the object. The distance between the second imaging center B2 and the second imaging position B3 is Δ2; the distance from the X-ray image generating device C to the rotation center is R1, and the distance from the X-ray generating device B1 to the rotation center O For R2, the distance R1 does not need to be equal to the distance R2, and in this embodiment, it is assumed that R1 is equal to R2 (as shown in Fig. 7);

Step 3: Calculation merge (as shown in FIG. 8) to the results of a first reference picture and the second reference image, the two resulting straight line passing through the center P of the object equation (A1A3 and B1B3), from the center of the article obtained solving simultaneous The coordinate position of P (as shown in Figure 9);

Step 4: moving the X-ray generating device (A1, B1) and the X-ray image generating device C from the rotating center O to the object center P, that is, using the object center P as the center of rotation;

Step 5: Using a mask to reduce the scanning range of the X-ray generating device, obtain an area scan image with the object center P as a center point, and perform a series of X-ray image imaging of each angle to achieve a partial three-dimensional image of the object (eg, Figure 10)).

In the embodiment, the calculation method of the rotation center is as follows: the first reference image and the second reference image are X-ray images before and after the offset angle θ at the same rotation center, as shown in FIG. 6 and FIG. Known conditions, such as the rotation center O of the first reference image and the second reference image are the origin coordinates (x0, y0), and R1 and R2 are the distance between the X-ray generating device and the X-ray image generating device and the origin, respectively. P point is the object center coordinate (x, y), θ is the support mechanism angle offset, and the distance between △1 and △2 can be calculated by the image obtained by the image reading device; if R1 is equal to R2 and R is assumed On the other hand, the three coordinates of A1, A2 and A3 are (x0, -R), (x0, R) and (△1, R) respectively; the three coordinates of B1, B2 and B3 are (-Rsin θ, - Rcos θ), (Rsin θ, Rcos θ) and (Rsin θ + Δ2cos θ, Rcos θ - Δ2sin θ).

Then, A1, A3 find the linear equation L ₁ (L ₁ = M ₁ X + N ₁ ) and B ₁ , B ₃ find the linear equation L ₂ (L ₂ = M ₂ X + N ₂ ), and find the solution as , N ₁ =-R, , Finally, the coordinates of the intersection point of the linear equation L ₁ and the linear equation L ₂ can be obtained to obtain the coordinate of the center of rotation, and the coordinates of the P point are ( , ).

The above-described embodiments are merely illustrative of the features and functions of the present invention, and are not intended to limit the scope of the technical scope of the present invention. Modifications and variations of the above-described embodiments can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as set forth in the scope of the claims described below.

Claims (10)

 A partial three-dimensional image forming system is a scanning system that uses an X-ray scanning object and locates a partial image center of the object, the system includes: a positioning system having an unifying moving module and a platform, the braking The module includes a supporting mechanism and a driving unit for driving the supporting mechanism; an X-ray image generating module has an X-ray generating device disposed on one side of the supporting mechanism, and a X-ray generating device disposed on the supporting mechanism opposite to the X An image reading device on one side of the light generating device; a processing module having a driving control unit and an image processing unit, wherein the driving unit is driven by the driving control unit to cause the driving unit to generate a corresponding action, and the supporting mechanism is driven Generating movement or rotation, using the X-ray image generating device to perform a first reference axial direction on the object and a second reference axial scan after the rotation angle to generate a first reference image and a second reference image, and the reference image is generated The input image processing unit calculates a local rotation center coordinate of the object, and transmits the calculated position information to the positioning system to drive the positioning According to the coordinate value, the actuation module is driven to move the X-ray image generating device to the coordinate, and the mask is used to change the cone angle of the X-ray radiation of the X-ray image generating device to a required range, and the angle is executed. The series of X-ray images are imaged, and the data is transmitted to the image processing unit for image processing to achieve a partial three-dimensional image of the object, thereby further reducing the X-ray exposure dose.    A partial three-dimensional image forming system according to claim 1, wherein the driving unit is a servo motor.    The partial three-dimensional image forming system of claim 1, wherein the support mechanism generates an angular offset through the driving unit.    The partial three-dimensional image forming system of claim 1, wherein the X-ray image generating device has a mask.    The partial three-dimensional image forming system of claim 1, wherein the image processing unit obtains a center coordinate of the object through the first reference image and the second reference image, thereby driving the actuation module to generate movement, The X-ray image generation module is moved to the coordinate, and the mask is further adjusted to further reduce the X-ray exposure dose.    A partial three-dimensional image forming method is a scanning method using an X-ray scanning object and positioning a partial image center of the object, the method step comprising: providing a positioning system having an actuation module and a platform; An object is disposed on the platform; an X-ray image generating module having an X-ray image generating device and an image reading device is provided; and the X-ray image generating device is used to perform a first reference axial scan of the object, and the image is read by the image Taking the device to generate the first reference image of the object, and then rotating the positioning system through a certain angle, and then using the X-ray image generating device to perform the second reference axial scanning of the object, obtaining the second reference image of the object, and inputting the reference image into the image The processing unit calculates a local rotation center coordinate of the object, and transmits the calculated position information to the positioning system, so as to drive the positioning system to drive the actuation module to move the X-ray image generating device to the coordinate according to the coordinate value, and The mask changes the cone angle of the X-ray radiation of the X-ray image generating device to a required range, and performs a series of X-ray images of various angles. The image is transmitted to the image processing unit for image processing to achieve a partial three-dimensional image of the object, thereby further reducing the X-ray exposure dose.    The partial three-dimensional image forming method according to claim 6, wherein the driving unit is a servo motor.    The partial three-dimensional image forming method according to claim 6, wherein the supporting mechanism generates an angular offset through the driving unit.    The method of forming a partial three-dimensional image according to claim 6, wherein the X-ray image generating device has a mask.    The partial 3D image forming method of claim 6, wherein the image processing unit obtains a center coordinate of the object through the first reference image and the second reference image, thereby driving the actuation module to generate movement, The X-ray image generation module is moved to the coordinate, and the mask is further adjusted to further reduce the X-ray exposure dose.