CN111227794A

CN111227794A - Method for extracting surface roughness after bone grinding or ablation based on OCT image

Info

Publication number: CN111227794A
Application number: CN202010030101.9A
Authority: CN
Inventors: 张建; 曾素娟; 蓝银涛
Original assignee: Guangzhou Medical University
Current assignee: Guangzhou Medical University
Priority date: 2020-01-13
Filing date: 2020-01-13
Publication date: 2020-06-05

Abstract

The invention provides a method for measuring the surface roughness of a bone by utilizing an optical coherence imaging (OCT) technology, which specifically comprises the following steps: acquiring an OCT image, the OCT image displaying a cross-section of a bone; according to the OCT image, determining the boundary line of the bone and the air by utilizing the characteristic that the image intensity of the bone is higher than that of the air; performing primary baseline calibration on a boundary line between a bone and air marked on the OCT image; performing secondary baseline calibration on the boundary line after baseline calibration by using the arithmetic mean middle line; calculating the boundary line after the secondary calibration according to a formula of the surface roughness to obtain the surface roughness; recording and displaying the measured surface roughness information.

Description

Method for extracting surface roughness after bone grinding or ablation based on OCT image

Technical Field

The invention relates to the field of bone artwork processing and surgical treatment of bone diseases, in particular to a method capable of being used for measuring surface roughness after bone grinding or ablation.

Background

Bone is a hard connective tissue, also made up of cells, fibers and matrix including but not limited to teeth, skull, jaw, leg bone. Grinding or ablation is a common treatment of bone, applied during bone art processing and surgical treatment of bone diseases. The measurement of the surface roughness of the bone is of great significance for evaluating the mechanical property and the corrosion resistance of the bone. Measurement of bone surface roughness has a promoting role in understanding bone surface ultrastructure. For artificial bone, surface roughness is closely related to its biocompatibility.

Disclosure of Invention

The present invention provides a solution based on optical coherence imaging (OCT) technology to solve the above problems.

OCT imaging is a well-established non-invasive optical imaging method; the method can nondestructively acquire the tomographic image of the object, and the strength of the OCT image is positively correlated to the strength of the light scattering property of the substance; the range of OCT images is sufficient for bone detection; the resolution of the OCT image is about 10 microns, and the fineness of surface roughness measurement can be guaranteed.

The light scattering ability of air and water is very weak, and the OCT image intensity is low; the scattering ability of the bone is strong, and the intensity in the OCT image is high.

The method of the present invention requires the following steps: during or after the bone grinding or ablation process, an OCT imaging system is used to acquire tomographic images of the tissue.

According to the OCT image, the characteristic that the image intensity of the bone is higher than that of the air is utilized, the image binarization processing can be utilized, the expansion corrosion operation is carried out, then the boundary line of the bone is extracted, and the boundary line can be marked on the OCT image.

According to the boundary line of the bone marked on the OCT image, a polynomial can be used for calibrating the baseline.

After primary baseline calibration is performed according to the boundary line of the bone marked on the OCT image, secondary baseline calibration can be performed by using an arithmetic mean center line.

And calculating the evaluation parameter of the surface roughness according to a formula of the evaluation parameter of the surface roughness after performing baseline calibration twice according to the boundary line of the bone marked on the OCT image.

And finally, recording and displaying the measured surface roughness information of the bone.

The method can monitor the surface roughness of the tissue during or after the treatment of the bone, and is an accurate, rapid and noninvasive method.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained according to the drawings without creative efforts for those skilled in the art.

Fig. 1 is a flowchart of OCT imaging for measuring bone surface roughness provided in an embodiment of the present application.

Fig. 2 is a schematic view of a measurement process for measuring the surface roughness of a bone by OCT imaging according to an embodiment of the present disclosure.

The surface roughness measurements based on the schematic are Ra =0.0034 and Rz = 0.025.

The above description is only one specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The method for extracting the surface roughness after bone grinding or ablation based on Optical Coherence Tomography (OCT) images is characterized in that the method can be distinguished from air based on the bone light scattering property, boundary lines are marked out by a certain method, then baseline calibration is carried out on the boundary lines, the surface roughness is further calculated, and finally recording and displaying are carried out.

2. The method of claim 1, wherein the bone is derived from an animal or human body.

3. The method of claim 1, wherein the object of the abrading or ablating operation is an ex vivo bone or a living bone.

4. The method of claim 1, wherein the air is a substance on the side of the surface common to bones, but not limited to, water or other substances.

5. The method of claim 1, wherein the OCT image is obtained by an OCT imaging device, which may be a time-domain OCT system or a frequency-domain OCT system.

6. The method of claim 1, wherein the calculation of the surface roughness of the bone group is performed in real time or post-processing.

7. The method of claim 1, wherein the bone boundary is extracted based on image intensity differences, but not limited to this method.

8. The method according to claim 5, wherein the boundary is obtained by image binarization processing and dilation-erosion operation and then extraction, but not limited to this algorithm.

9. The method according to claim 1, wherein the calibration of the boundary line is performed twice, but not limited to twice.

10. The method of claim 7, wherein the first calibration of the boundary line includes, but is not limited to, polynomial calibration.

11. The method of claim 7, wherein the second calibration of the boundary line is obtained by using an arithmetic mean centerline, but is not limited to this algorithm.

12. The method according to claim 1, wherein the surface roughness is calculated by a calculation formula of a surface roughness evaluation parameter.

13. The method of claim 1, wherein the surface roughness assessment parameters include, but are not limited to, profile arithmetic mean deviation Ra and profile maximum height Rz.