WO2019037142A1 - 一种oct导管的校准装置及方法 - Google Patents

一种oct导管的校准装置及方法 Download PDF

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WO2019037142A1
WO2019037142A1 PCT/CN2017/099582 CN2017099582W WO2019037142A1 WO 2019037142 A1 WO2019037142 A1 WO 2019037142A1 CN 2017099582 W CN2017099582 W CN 2017099582W WO 2019037142 A1 WO2019037142 A1 WO 2019037142A1
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oct
image
catheter
calibration device
oct catheter
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PCT/CN2017/099582
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French (fr)
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李百灵
宋李烟
潘江帆
孔冠岳
蔡志岗
邱宇民
李佼洋
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广州永士达医疗科技有限责任公司
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Publication of WO2019037142A1 publication Critical patent/WO2019037142A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0062—Arrangements for scanning
    • A61B5/0066—Optical coherence imaging
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0033—Features or image-related aspects of imaging apparatus classified in A61B5/00, e.g. for MRI, optical tomography or impedance tomography apparatus; arrangements of imaging apparatus in a room

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  • the invention relates to the field of medical imaging, and in particular to a calibration device and method for an OCT catheter.
  • OCT optical coherence Tomography
  • OCT imaging technology eliminates the need for any developer, has no ionization and fluorescence effects, and is more secure than traditional imaging techniques. It is called optical biopsy.
  • an object of the present invention to provide an OCT catheter calibration device that is capable of calibrating an OCT catheter.
  • Another object of the present invention is to provide an OCT catheter calibration method that calibrates an OCT catheter.
  • An OCT catheter calibration device comprising a reflector, the number of the reflectors being a plurality of blocks, the plurality of The block reflectors are sequentially connected to form a channel, the OCT conduit is disposed in the channel, and the distance between the OCT conduit and each of the reflectors is the same.
  • the number of the reflecting plates is three.
  • the OCT conduit is tangent to the three reflectors.
  • the reflector is a curved reflector.
  • the material of the reflector is ABS plastic or polyethylene or high density polyethylene.
  • a method of calibrating an OCT catheter comprising the steps of:
  • Image acquisition step acquiring an OCT imaging image obtained by setting an OCT catheter in the calibration device;
  • Histogram equalization step histogram equalization of the OCT image
  • Hough line transformation step performing Hough line transformation on the equalized OCT image to obtain an OCT evaluation image
  • Calibration result acquisition step According to the OCT evaluation image to obtain the calibration result, the coherent working distance is determined according to the calibration result and the micro motor moving reference mirror is controlled.
  • the coherent working distance of the OCT catheter can be effectively calibrated by the OCT catheter calibration apparatus and method of the present invention to output a suitable OCT image.
  • Figure 1 is a structural view of an OCT catheter calibration device of the present invention
  • FIG. 2 is a flow chart of a method for calibrating an OCT catheter of the present invention.
  • the present invention provides an OCT catheter calibration device comprising a reflector 11, the number of the reflectors 11 being a plurality of blocks, and most preferably, the number of the reflectors 11 is set to three, and three
  • the block reflectors 11 are sequentially connected to form a channel 3, the OCT conduit 2 is disposed in the channel 3, and the distance between the OCT conduit 2 and each of the reflectors 11 is the same; most preferably, the OCT conduit 2 is The OCT conduit 2 is disposed in the channel 3, and the OCT conduit 2 is tangential to the three reflectors 11, so that the position adjustment of the OCT conduit 2 to each of the reflectors 11 can be directly performed without performing position adjustment during calibration detection. Equivalent; an optical fiber 4 is disposed in the OCT conduit 2, and the optical fiber 4 is used to transmit an optical signal;
  • the reflector 11 can also be implemented in several ways.
  • the reflector 11 can be directly disposed as a flat panel, and the three reflectors are connected to form a triangular prism for reflecting the optical signal emitted by the OCT conduit 2, or
  • the reflecting plate 11 is a curved reflecting plate, and the curved reflecting plates are also connected in sequence to form a mounting channel of the OCT conduit 2, and the curved surface may be a curved surface that is recessed inward, or may be a curved surface that is concave outward, through the curved reflecting plate. It is arranged such that it is straight in the image having image distortion to be detected by the line; the material of the reflecting plate 11 is ABS or PE or HDPE.
  • the calibration device 1 is a triangular prism-shaped micro-component made of a transparent medical material; it is placed on the outer surface of the catheter.
  • the calibration device 1 is hollow inside, that is, a channel 3 is formed, and the inner surfaces of the three reflecting plates 11 of the calibration device 1 are respectively tangential to the OCT catheter 2.
  • the calibration device 1 calibrates the coherent working distance of the instrument with the corresponding calibration method of the component before obtaining the OCT image for the first time; after the calibration is completed, the calibration device 1 needs to be released from the OCT catheter 2 and discarded.
  • the present invention provides a calibration method for an OCT catheter, comprising the following steps:
  • S1 acquiring an OCT imaging image obtained by the OCT catheter 2 disposed in the calibration device 1; placing the calibration device 1 on the outer surface of the OCT catheter 2, and making the inner surface of the calibration device 1 and the OCT catheter 2 The outer surface is tangent; and the movable reference mirror is continuously adjusted by the micromotor to adjust the coherent working distance, and the OCT image is reflected on the display in real time; the micromotor and the movable reference mirror are external devices, the micromotor and the The moving reference mirrors are all devices in the interferometer and then adjusted accordingly;
  • S2 Histogram equalization of the OCT image; the histogram equalization is considered to improve the contrast of the image;
  • the image is evaluated according to the OCT to obtain a calibration result.
  • the image processing module filters the image after the Hough line transformation. It is adopted for an image that can display a triangular shape.
  • the area of the triangle enclosed by the calibration component in the image after the Hough line transformation is detected. When the average area of the area within a certain number of frames is in the standard area size interval, the coherent working distance at this time is determined and the adjustment of the movable reference mirror by the micromotor is stopped.
  • the calibration component includes a triangular prismatic micro-component consisting of a transparent PE that is hollow and has three faces that are curved.
  • the calibration device 1 is placed over the OCT catheter 2. Prior to the catheter self-test, the calibration device 1 is placed over the outer surface of the OCT catheter 2, and the three inner surfaces of the device are tangential to the OCT catheter 2, respectively.

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Abstract

一种OCT导管校准装置，包括反射板（11），反射板（11）的数量为多块，多块反射板（11）依次相连以形成一通道（3），该OCT导管（2）设置于该通道（3）中，且该OCT导管（2）到各反射板（11）的距离相同。通过该OCT导管校准装置及方法可以有效的对OCT导管（2）的相干工作距离进行校准以使得输出合适的OCT成像图像。

Description

一种OCT导管的校准装置及方法 技术领域
本发明涉及一种医疗成像领域，尤其涉及一种OCT导管的校准装置及方法。
背景技术
OCT(Optical coherence Tomography,光学相干层析技术)是近十年迅速发展的一种高分辨率成像技术，该技术是基于低相干光干涉原理，并与共焦显微技术相结合，检测生物组织不同深度层对入射弱相干光的后向散射波回波时间延迟及回波强度信号，通过扫描得到样品二维或三维的高分辨率微观组织结构，从而获得被测样品无损的断层层析图像。OCT成像技术无需添加任何显影剂，没有电离效应和荧光效应，比传统的影像技术安全性更高，被称为光学活检。
当使用OCT时，不同的相干工作距离会影响并导致干涉产生不同的成像效果，如图像大小过大或过小，图像关于零光程位置完全对称的共轭镜像等情况。由于成像质量差的图像将不利于医疗人员的诊断，因而使用仪器前需对其进行相干工作距离的校准，以使所成医疗图像能清晰且准确反映器官内部情况，辅助医疗人员诊断。
发明内容
为了克服现有技术的不足，本发明的目的之一在于提供一种OCT导管校准装置，其能对OCT导管的进行校准。
本发明的目的之二在于提供一种OCT导管校准方法，其能对OCT导管的进行校准。
本发明的目的之一采用如下技术方案实现：
一种OCT导管校准装置，包括反射板，所述反射板的数量为多块，所述多 块反射板依次相连以形成一通道，所述OCT导管设置于该通道中，且所述OCT导管到各反射板的距离相同。
进一步地，所述反射板的数量有三块。
进一步地，所述OCT导管与三块反射板相切。
进一步地，所述反射板为曲面反射板。
进一步地，所述反射板的材料为ABS塑料或者聚乙烯或者高密度聚乙烯。
本发明的目的之二采用如下技术方案实现：
一种OCT导管的校准方法，包括以下步骤：
图像获取步骤：获取OCT成像图像，所述OCT成像图像由OCT导管设置于校准装置内得到；
直方图均衡步骤：对OCT成像图像进行直方图均衡化；
霍夫线变换步骤：对均衡化后的OCT成像图像进行霍夫线变换以得OCT评价图像；
校准结果获取步骤：根据OCT评价图像以得校准结果，根据校准结果确定相干工作距离并控制微电机移动参考镜。
相比现有技术，本发明的有益效果在于：
通过本发明的OCT导管校准装置及方法可以有效的对OCT导管的相干工作距离进行校准以使得输出合适的OCT成像图像。
附图说明
图1为本发明的OCT导管校准装置的结构图；
图2为本发明的OCT导管校准方法的流程图。
附图标记：1、校准装置；11、反射板；2、OCT导管；3、通道；4、光纤。
具体实施方式
下面，结合附图以及具体实施方式，对本发明做进一步描述，需要说明的是，在不相冲突的前提下，以下描述的各实施例之间或各技术特征之间可以任意组合形成新的实施例。
如图1所示，本发明提供了一种OCT导管校准装置，包括反射板11，所述反射板11的数量为多块，最为优选的，反射板11的数量设置为三块，并且使得三块反射板11依次相连以形成一通道3，所述OCT导管2设置于该通道3中，且所述OCT导管2到各反射板11的距离相同；最为优选地实施方式是，该OCT导管2设置于通道3中，且OCT导管2与三块反射板11相切，这样在进行校准检测的时候也即不需要再进行位置调整，便可以直接使得OCT导管2到各个反射板11的距离都相等；所述OCT导管2内设置有光纤4，该光纤4用于传输光信号；
该反射板11也有几种方式来进行实施，该反射板11可以直接设置为平面板，则该三块反射板相接形成三棱柱，其用来反射OCT导管2发射的光信号，或者所述反射板11为曲面反射板，所述曲面反射板也依次相连接以形成OCT导管2的安装通道，该曲面可以是向内凹陷的曲面，也可以是向外凹陷的曲面，通过曲面反射板的设置从而使得在有图像畸变的图像中呈直线以被线检测；所述反射板11的材料为ABS或者PE或者HDPE。
该校准装置1为透明医用材料构成的三棱柱形微部件；其出厂即套于导管外表面。该校准装置1内部中空，也即是形成一通道3，校准装置1的三个反射板11内表面分别与OCT导管2相切。该校准装置1在首次获得OCT成像图像前，用配套该部件的相应校准方法对仪器进行相干工作距离进行校准；校准完毕，校准装置1需从OCT导管2上解除并丢弃。
如图2所示，本发明提供了一种OCT导管的校准方法，包括以下步骤：
S1：获取OCT成像图像，所述OCT成像图像由OCT导管2设置于校准装置1内得到；使校准装置1套于OCT导管2的外表面，并使校准装置1的内表面与OCT导管2的外表面相切；并且使得通过微电机不断调节可移动参考镜以调节相干工作距离，并实时于显示屏上反映OCT图像；这里的微电机与可移动参考镜都是外部的器件，微电机和可移动参考镜都属于干涉仪中的器件，然后来对其进行相应调节的；
S2：对OCT成像图像进行直方图均衡化；直方图均衡化视为了提高图像的对比度；
S3：对均衡化后的OCT成像图像进行霍夫线变换以得OCT评价图像；图像处理模块对OCT图像直方图均衡化，对均衡化后的图像进行霍夫线变换，通过把原普通坐标空间的点映射转化为参数空间的线
S4：根据OCT评价图像以得校准结果。图像处理模块对于霍夫线变换后的图像进行筛选。对于能显示出三角形状的图像予以采纳。检测霍夫线变换后的图像中校准部件所围成的三角形面积。当连续一定帧数内所围面积平均值处于标准面积大小区间时，确定此时的相干工作距离并控制微电机停止对可移动参考镜的调节。
校准部件包括由透明PE构成的三棱柱形微部件，该部件中空，三个面均为曲面。校准装置1套于OCT导管2外面。导管自检前，该校准装置1套于OCT导管2外表面，该装置的三个内表面分别与OCT导管2相切。
首次使用仪器获取OCT图像前，需要使用该部件以及与其配套的校准方法对仪器进行相干工作距离校准。
上述实施方式仅为本发明的优选实施方式，不能以此来限定本发明保护的 范围，本领域的技术人员在本发明的基础上所做的任何非实质性的变化及替换均属于本发明所要求保护的范围。

Claims (6)

  1. 一种OCT导管校准装置，其特征在于，包括反射板，所述反射板的数量为多块，所述多块反射板依次相连以形成一通道，所述OCT导管设置于该通道中，且所述OCT导管到各反射板的距离相同。
  2. 如权利要求1所述的OCT导管校准装置，其特征在于，所述反射板的数量有三块。
  3. 如权利要求2所述的OCT导管校准装置，其特征在于，所述OCT导管与三块反射板相切。
  4. 如权利要求1所述的OCT导管校准装置，其特征在于，所述反射板为曲面反射板。
  5. 如权利要求1所述的OCT导管校准装置，其特征在于，所述反射板的材料为ABS塑料或者聚乙烯或者高密度聚乙烯。
  6. 一种OCT导管的校准方法，其特征在于，包括以下步骤：
    图像获取步骤：获取OCT成像图像，所述OCT成像图像由OCT导管设置于校准装置内得到；
    直方图均衡步骤：对OCT成像图像进行直方图均衡化；
    霍夫线变换步骤：对均衡化后的OCT成像图像进行霍夫线变换以得OCT评价图像；
    校准结果获取步骤：根据OCT评价图像以得校准结果，根据校准结果确定相干工作距离并控制微电机移动参考镜。
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