WO2016149862A1 - 一种在m模式超声影像上进行测量的方法及装置 - Google Patents

一种在m模式超声影像上进行测量的方法及装置 Download PDF

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WO2016149862A1
WO2016149862A1 PCT/CN2015/074692 CN2015074692W WO2016149862A1 WO 2016149862 A1 WO2016149862 A1 WO 2016149862A1 CN 2015074692 W CN2015074692 W CN 2015074692W WO 2016149862 A1 WO2016149862 A1 WO 2016149862A1
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ultrasound image
mode ultrasound
measurement
mode
point
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French (fr)
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刘刚
姜昭东
蒋胡杰
黄德春
高宇磊
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Ge医疗系统环球技术有限公司
刘刚
姜昭东
蒋胡杰
黄德春
高宇磊
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Application filed by Ge医疗系统环球技术有限公司, 刘刚, 姜昭东, 蒋胡杰, 黄德春, 高宇磊 filed Critical Ge医疗系统环球技术有限公司
Priority to US15/560,037 priority Critical patent/US20180070921A1/en
Priority to PCT/CN2015/074692 priority patent/WO2016149862A1/zh
Publication of WO2016149862A1 publication Critical patent/WO2016149862A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/48—Diagnostic techniques
    • A61B8/486—Diagnostic techniques involving arbitrary m-mode
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/13—Tomography
    • A61B8/14—Echo-tomography
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/46—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient
    • A61B8/467—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient characterised by special input means
    • A61B8/468—Ultrasonic, sonic or infrasonic diagnostic devices with special arrangements for interfacing with the operator or the patient characterised by special input means allowing annotation or message recording
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/5207—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of raw data to produce diagnostic data, e.g. for generating an image
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/52—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/5215—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of medical diagnostic data
    • A61B8/5238—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of medical diagnostic data for combining image data of patient, e.g. merging several images from different acquisition modes into one image
    • A61B8/5246—Devices using data or image processing specially adapted for diagnosis using ultrasonic, sonic or infrasonic waves involving processing of medical diagnostic data for combining image data of patient, e.g. merging several images from different acquisition modes into one image combining images from the same or different imaging techniques, e.g. color Doppler and B-mode
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/50—Depth or shape recovery
    • G06T7/536—Depth or shape recovery from perspective effects, e.g. by using vanishing points

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  • the present invention relates to a method and apparatus for performing measurements on an ultrasound image, and more particularly to a method and apparatus for performing measurements on an M-mode ultrasound image.
  • Ultrasound images usually have two modes, B mode and M mode.
  • the B-mode ultrasound image displays the ultrasonic echo signal in the form of a light spot. When the echo is strong, the light is illuminated, and when the echo is weak, the light spot is dark.
  • the anatomical section of the organ can be presented on the B-mode ultrasound image.
  • the M-mode ultrasound image is based on the single-beam B-scan, adding a slow-scan sawtooth wave, converting the spot into a curve, and moving the echo spot from left to right.
  • M-mode ultrasound images can be used to measure some length information over time, especially for the measurement of some parameters of the heart, blood vessels and other organs, such as: left ventricular ejection fraction (LVEF), interventricular septum thickness (IVS), etc. .
  • LVEF left ventricular ejection fraction
  • IVS interventricular septum thickness
  • the existing method for measuring on an M-mode ultrasound image is performed by a doctor of an ultrasound department to visually observe an M-mode ultrasound image, and then manually selecting an appropriate measurement point on the M-mode ultrasound image. Since the M-mode ultrasound image does not contain the anatomical information of the organ, it is difficult to accurately select the measurement point for an ultrasound surgeon who is not very experienced.
  • An embodiment of the present invention provides a method for performing measurement on an M mode ultrasound image, comprising: acquiring position information of a measurement point on an M mode ultrasound image; and a B mode corresponding to the M mode ultrasound image according to the position information.
  • the corresponding points of the measurement points are marked on the ultrasonic image; and the measurement is performed on the M mode ultrasonic image according to the position information.
  • Another embodiment of the present invention provides an apparatus for performing measurements on an M mode ultrasound image.
  • the method includes: acquiring a module, configured to acquire position information of a measurement point on the M mode ultrasound image; and an annotation module, configured to mark, according to the position information, a corresponding point of the measurement point on the B mode ultrasound image corresponding to the M mode ultrasound image; And a measurement module for performing measurement on the M mode ultrasound image according to the position information.
  • FIG. 1 is a schematic overall flow chart of an embodiment of a method for performing measurement on an M-mode ultrasound image according to the present invention
  • FIG. 2 is a flow chart showing an embodiment of marking a corresponding point of a measurement point on a B-mode ultrasound image corresponding to an M-mode ultrasound image according to position information during measurement on an M-mode ultrasound image according to the present invention; schematic diagram;
  • FIG. 3 is a schematic block diagram of one embodiment of an apparatus for performing measurements on an M-mode ultrasound image of the present invention.
  • a method of making measurements on an M-mode ultrasound image is provided.
  • Method 100 can include the following steps 101 through 103.
  • step 101 position information of measurement points on the M-mode ultrasound image is acquired.
  • the doctor can identify the point for measurement on the generated M-mode ultrasound image, called the measurement point.
  • the position information of the measurement point can be obtained by the horizontal and vertical coordinate values of the measurement point.
  • step 102 corresponding points of the measurement points are marked on the B-mode ultrasound image corresponding to the M-mode ultrasound image according to the position information.
  • the measurement point is obtained in the B corresponding to the M-mode ultrasound image.
  • the position on the ultrasound image is modeled so that the measurement point is marked on the B-mode ultrasound image.
  • FIG. 2 is a flow chart showing an embodiment of step 102.
  • Step 102 can include sub-steps 201-204 as follows.
  • sub-step 201 the time corresponding to the measurement point is determined based on the location information.
  • the time corresponding to the measurement point may be represented by the abscissa in the position information of the measurement point on the M mode ultrasound image.
  • sub-step 202 a B-mode ultrasound image corresponding to the time is searched.
  • the B mode ultrasound image corresponding to the time may be searched for in the stored B mode ultrasound image according to the time determined by the substep 101.
  • the depth of the measurement point is determined based on the location information.
  • the depth of the measurement point can be determined by the ordinate in the position information of the measurement point on the M-mode ultrasound image.
  • corresponding points are determined on the B-mode ultrasound image based on the depth.
  • the depth of the measurement point obtained in sub-step 203 can be used to perform appropriate coordinate transformation, and the position of the corresponding point of the measurement point on the B-mode ultrasound image can be determined, and then The B-mode ultrasound image determined in step 202 marks the corresponding point.
  • the doctor can see the position of each measurement point selected on the M mode ultrasound image on the corresponding B mode ultrasound image, and then can determine the measurement points by combining the anatomical information on the B mode ultrasound image. Is the location appropriate? If the doctor thinks that the position of a measurement point is not suitable, the measurement point can be re-selected on the M-mode ultrasound image, ie, the existing measurement point is deleted and a new measurement point is selected. This can be seen as changing the position of a measurement point. That is to say, when a certain measurement point is deleted from the M-mode ultrasound image, correspondingly, its corresponding point on the B-mode ultrasound image is also deleted, and then can be performed on the B-mode image by performing step 102 again. Relabel the corresponding point of the new measurement point. Until the doctor thinks the position of the measuring point has met the requirements.
  • step 103 the measurement is performed on the M mode ultrasound image based on the position information.
  • the measured object is the length of a straight line segment on the M-mode ultrasound image
  • it can be calculated on the M-mode ultrasound image when the number of measurement points reaches two.
  • the measurement result can also be displayed on the corresponding B-mode ultrasound image.
  • the measurement points involved in the measurement may not be marked on the ultrasonic image of the M mode, and the corresponding points of the measurement points are no longer marked in the B mode. On the ultrasound image.
  • a method of performing measurement on an M mode ultrasound image according to an embodiment of the present invention has been described so far.
  • the position of the measurement point on the corresponding B-mode ultrasound image is automatically displayed/updated, thereby facilitating the doctor to determine whether the measurement point is Is set in the right place. In this way, the speed and accuracy of measuring the M-mode ultrasound image can be improved.
  • the present invention also provides a corresponding device.
  • FIG. 3 is a schematic block diagram of one embodiment of an apparatus 300 for performing measurements on an M-mode ultrasound image of the present invention.
  • the apparatus 300 may include: an acquiring module 301, configured to acquire position information of a measurement point on the M-mode ultrasound image; and an annotation module 302, configured to perform a B mode corresponding to the M-mode ultrasound image according to the position information. A corresponding point of the measurement point is marked on the ultrasonic image; and a measurement module 303 is configured to measure the M mode ultrasonic image according to the position information.
  • the labeling module 302 may further include a time determination module for determining a time corresponding to the measurement point according to the location information, and a search module for searching for the B mode ultrasound image corresponding to the time.
  • the labeling module 302 may further include: a depth determining module configured to determine a depth of the measuring point according to the position information; and a corresponding point determining module configured to determine a corresponding point on the B mode ultrasonic image according to the depth .
  • the apparatus 300 may further include: a re-labeling module for re-labeling the corresponding point on the B-mode image when the position is changed.
  • the measurement module 303 may further include: a distance calculation module, configured to calculate a linear distance between the two measurement points on the M mode ultrasound image when the number of measurement points reaches two.
  • the doctor can automatically display/update the position of the measurement point on the corresponding B-mode ultrasound image when the measurement point is set/updated on the M-mode ultrasound image, thereby facilitating the doctor. It is determined whether the measurement point is set at an appropriate position. In this way, the speed and accuracy of measuring the M-mode ultrasound image can be improved.
  • the technical solution of the present invention can be applied to various different M modes, such as: basic M mode, anatomical M mode, curve anatomy M mode, and the like.

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Abstract

一种在M模式超声影像上进行测量的方法及装置。该方法包括：获取M模式超声影像上的测量点的位置信息，根据位置信息在与M模式超声影像相对应的B模式超声影像上标注出测量点的对应点；以及根据位置信息在M模式超声影像上进行测量。

Description

一种在M模式超声影像上进行测量的方法及装置 技术领域
本发明涉及一种在超声影像上进行测量的方法及装置，尤其涉及一种在M模式超声影像上进行测量的方法及装置。
背景技术
超声影像通常有B模式和M模式两种。B模式超声影像是将超声回声信号以光点的形式显示出来，回声强则光点亮，回声弱则光点暗。B模式超声影像上可以呈现出脏器的解剖切面。M模式超声影像是在单声束B型扫描基础上加入慢扫描锯齿波，将光点转换成曲线，使回声光点从左向右自行移动扫描。
M模式超声影像可以用于测量一些随时间变化的长度信息，尤其是用于对心脏、血管等器官的一些参数的测量，比如：左心室射血分数(LVEF)、室间隔厚度(IVS)等。
现有的在M模式超声影像上进行测量的方法，是由超声科的医生对M模式超声影像进行肉眼观察，然后手动地在M模式超声影像上选取合适的测量点来完成。由于M模式超声影像不包含脏器的解剖学信息，因此，对于经验不是十分丰富的超声科医生而言，很难准确地选择测量点。
发明内容
本发明的目的在于提供一种在M模式超声影像上进行测量的方法及装置，能够引导医生快速、准确地完成在M模式超声影像上的测量。
本发明的一个实施例提供了一种在M模式超声影像上进行测量的方法，包括：获取M模式超声影像上的测量点的位置信息；根据位置信息在与M模式超声影像相对应的B模式超声影像上标注出测量点的对应点；以及根据位置信息在M模式超声影像上进行测量。
本发明另一个实施例提供了一种在M模式超声影像上进行测量的装置， 包括：获取模块，用于获取M模式超声影像上的测量点的位置信息；标注模块，用于根据位置信息在与M模式超声影像相对应的B模式超声影像上标注出测量点的对应点；以及测量模块，用于根据位置信息在M模式超声影像上进行测量。
附图说明
通过结合附图对于本发明的实施例进行描述，可以更好地理解本发明，在附图中：
图1所示为本发明的在M模式超声影像上进行测量的方法的一个实施例的总体流程示意图；
图2所示为本发明的在M模式超声影像上进行测量的过程中的根据位置信息在与M模式超声影像相对应的B模式超声影像上标注出测量点的对应点的一个实施例的流程示意图；
图3所示为本发明的在M模式超声影像上进行测量的装置的一个实施例的示意性框图。
具体实施方式
以下将描述本发明的具体实施方式，需要指出的是，在这些实施方式的具体描述过程中，为了进行简明扼要的描述，本说明书不可能对实际的实施方式的所有特征均作详尽的描述。应当可以理解的是，在任意一种实施方式的实际实施过程中，正如在任意一个工程项目或者设计项目的过程中，为了实现开发者的具体目标，为了满足系统相关的或者商业相关的限制，常常会做出各种各样的具体决策，而这也会从一种实施方式到另一种实施方式之间发生改变。此外，还可以理解的是，虽然这种开发过程中所做出的努力可能是复杂并且冗长的，然而对于与本发明公开的内容相关的本领域的普通技术人员而言，在本公开揭露的技术内容的基础上进行的一些设计，制造或者生产等变更只是常规的技术手段，不应当理解为本公开的内容不充分。
除非另作定义，权利要求书和说明书中使用的技术术语或者科学术语 应当为本发明所属技术领域内具有一般技能的人士所理解的通常意义。本发明专利申请说明书以及权利要求书中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。“一个”或者“一”等类似词语并不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现在“包括”或者“包含”前面的元件或者物件涵盖出现在“包括”或者“包含”后面列举的元件或者物件及其等同元件，并不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，也不限于是直接的还是间接的连接。
为使本发明的目的、技术方案和优点更加清楚，下面将结合本发明具体实施例及相应的附图对本发明技术方案进行清楚、完整地描述。显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
根据本发明的实施例，提供了一种在M模式超声影像上进行测量的方法。
参考图1，图1所示为本发明的在M模式超声影像上进行测量的方法100的一个实施例的流程示意图。方法100可以包含如下步骤101至103。
如图1所示，在步骤101中，获取M模式超声影像上的测量点的位置信息。
在进行超声扫描时，医生可以在生成的M模式超声影像上标识出用于测量的点，称之为测量点。
在本发明的一个实施例中，当医生在M模式超声影像上标识出一个测量点时，可以通过该测量点的横、纵坐标值来获取其位置信息。
在步骤102中，根据位置信息在与M模式超声影像相对应的B模式超声影像上标注出测量点的对应点。
在本发明的一个实施例中，可以根据步骤101中获取到的M模式超声影像上的测量点的位置信息，得到该测量点在与M模式超声影像相对应的B 模式超声影像上的位置，从而将该测量点在B模式超声影像上标注出来。
参考图2，图2所示为步骤102的一个实施例的流程示意图。步骤102可以包含如下子步骤201至204。
在子步骤201中，根据位置信息确定测量点所对应的时刻。
在本发明的一个实施例中，可以用M模式超声影像上的测量点的位置信息中的横坐标来代表该测量点所对应的时刻。
在子步骤202中，搜索时刻对应的B模式超声影像。
在本发明的一个实施例中，可以在存储的B模式超声影像中，根据子步骤101所确定的时刻，搜索出该时刻所对应的那一幅B模式超声影像。
在子步骤203中，根据位置信息确定测量点的深度。
在本发明的一个实施例中，可以通过M模式超声影像上的测量点的位置信息中的纵坐标来确定测量点的深度。
在子步骤204中，根据深度在B模式超声影像上确定对应点。
在本发明的一个实施例中，可以用子步骤203中得到的测量点的深度，进行适当的坐标变换，就可以确定出该测量点在B模式超声影像上的对应点的位置，进而在子步骤202所确定的B模式超声影像标注出该对应点。
经过步骤102之后，医生可以看到自己在M模式超声影像上选取的每一个测量点在对应的B模式超声影像上的位置，进而可以结合B模式超声影像上的解剖学信息判定这些测量点的位置是否合适。如果医生认为某个测量点的位置不合适，可以在M模式超声影像上重新选取该测量点，即：将已有的测量点删除并新选择一个测量点。这可以视为是改变了一个测量点的位置。也就是说，当某个测量点从M模式的超声影像上被删除时，相应地，其在B模式超声影像上的对应点也被删除，然后可以通过重新执行步骤102来在B模式影像上重新标注新测量点的对应点。直至医生认为测量点的位置已经满足要求。
在步骤103中，根据位置信息在M模式超声影像上进行测量。
在本发明的一个实施例中，如果测量的对象是M模式超声影像上的一段直线段的长度，可以在测量点的个数达到两个时，在M模式超声影像上计算 两个测量点之间的直线距离，从而完成一次测量。此外，还可以在相应的B模式超声影像上显示出该测量结果。
在本发明的一个实施例中，当一次测量完成后，可以不再将该测量涉及到的测量点标注于M模式的超声影像上，同样也不再将这些测量点的对应点标注于B模式的超声影像上。
至此描述了根据本发明实施例的在M模式超声影像上进行测量的方法。根据本发明的方法，能够使医生在M模式的超声影像上设置/更新测量点时，自动地显示/更新该测量点在对应的B模式超声影像上的位置，从而方便医生判定该测量点是否被设置在了合适的位置。这样，就可以提高对M模式的超声影像进行测量的速度和准确性。
与该方法类似，本发明还提供了相应的装置。
图3所示为本发明的在M模式超声影像上进行测量的装置300的一个实施例的示意性框图。
如图3所示，装置300可以包括：获取模块301，用于获取M模式超声影像上的测量点的位置信息；标注模块302，用于根据位置信息在与M模式超声影像相对应的B模式超声影像上标注出测量点的对应点；以及测量模块303，用于根据位置信息对M模式超声影像上进行测量。
在本发明的一个实施例中，标注模块302可以进一步包括时刻确定模块，用于根据位置信息确定测量点所对应的时刻；以及搜索模块，用于搜索时刻对应的B模式超声影像。
在本发明的一个实施例中，标注模块302可以进一步包括：深度确定模块，用于根据位置信息确定测量点的深度；以及对应点确定模块，用于根据深度在B模式超声影像上确定对应点。
在本发明的一个实施例中，装置300还可以包括：重新标注模块，用于当位置改变时，在B模式影像上重新标注对应点。
在本发明的一个实施例中，测量模块303可以进一步包括：距离计算模块，用于当测量点的个数达到两个时，在M模式超声影像上计算两个测量点之间的直线距离。
至此描述了根据本发明实施例的在M模式超声影像上进行测量的装置。与上述方法类似，根据本发明的装置，能够使医生在M模式的超声影像上设置/更新测量点时，自动地显示/更新该测量点在对应的B模式超声影像上的位置，从而方便医生判定该测量点是否被设置在了合适的位置。这样，就可以提高对M模式的超声影像进行测量的速度和准确性。此外,本发明技术方案可以适用于各种不同的M模式，比如：基本M模式、解剖M模式、曲线解剖M模式等。
以上所述仅为本发明的实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的权利要求范围之内。

Claims (10)

  1. 一种在M模式超声影像上进行测量的方法，其特征是，包括：
    获取所述M模式超声影像上的测量点的位置信息；
    根据所述位置信息在与所述M模式超声影像相对应的B模式超声影像上标注出所述测量点的对应点；以及
    根据所述位置信息在所述M模式超声影像上进行测量。
  2. 根据权利要求1所述的方法，其特征是，所述根据所述位置信息在与所述M模式超声影像相对应的B模式超声影像上标注出所述测量点的对应点的步骤进一步包括：
    根据所述位置信息确定所述测量点所对应的时刻；以及
    搜索所述时刻对应的B模式超声影像。
  3. 根据权利要求2所述的方法，其特征是，所述根据所述位置信息在与所述M模式超声影像相对应的B模式超声影像上标注出所述测量点的对应点的步骤进一步包括：
    根据所述位置信息确定所述测量点的深度；以及
    根据所述深度在所述B模式超声影像上确定所述对应点。
  4. 根据权利要求1所述的方法，其特征是，还包括：
    当所述位置信息改变时，在所述B模式影像上重新标注所述对应点。
  5. 根据权利要求1所述的方法，其特征是，所述根据所述位置信息对M模式超声影像上进行测量的步骤进一步包括：
    当所述测量点的个数达到两个时，在所述M模式超声影像上计算两个所述测量点之间的直线距离。
  6. 一种在M模式超声影像上进行测量的装置，其特征是，包括：
    获取模块，用于获取所述M模式超声影像上的测量点的位置信息； 标注模块，用于根据所述位置信息在与所述M模式超声影像相对应的B模式超声影像上标注出所述测量点的对应点；以及
    测量模块，用于根据所述位置信息在所述M模式超声影像上进行测量。
  7. 根据权利要求6所述的装置，其特征是，所述标注模块进一步包括：
    时刻确定模块，用于根据所述位置信息确定所述测量点所对应的时刻；以及
    搜索模块，用于搜索所述时刻对应的B模式超声影像。
  8. 根据权利要求7所述的装置，其特征是，所述标注模块进一步包括：
    深度确定模块，用于根据所述位置信息确定所述测量点的深度；以及
    对应点确定模块，用于根据所述深度在所述B模式超声影像上确定所述对应点。
  9. 根据权利要求6所述的装置，其特征是，还包括：
    重新标注模块，用于当所述位置改变时，在所述B模式影像上重新标注所述对应点。
  10. 根据权利要求6所述的装置，其特征是，所述测量模块进一步包括：
    距离计算模块，用于当所述测量点的个数达到两个时，在所述M模式超声影像上计算两个所述测量点之间的直线距离。
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