CN101766494B - Method for reusing operation parameters of high-intensity focused ultrasound equipment - Google Patents

Method for reusing operation parameters of high-intensity focused ultrasound equipment Download PDF

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CN101766494B
CN101766494B CN 200810190857 CN200810190857A CN101766494B CN 101766494 B CN101766494 B CN 101766494B CN 200810190857 CN200810190857 CN 200810190857 CN 200810190857 A CN200810190857 A CN 200810190857A CN 101766494 B CN101766494 B CN 101766494B
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moving image
before
patient
image
interest
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CN101766494A (en )
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吴伟刚
林佳裕
陈旸
奥利弗·施雷克
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西门子公司
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Abstract

本发明公开了一种使高强度聚焦超声设备的操作参数可再度使用的方法,该方法包括:在病人发生移动之前,使用磁共振成像设备对病人进行扫描,得到移动前图像;在病人发生移动之后,定位承载病人的病床,按照所述移动前图像所用扫描参数,使用所述磁共振成像设备对病人再次进行扫描,得到移动后图像;根据所述移动前图像和移动后图像,判断病人移动前后的位置差异是否可接受,如果是,则所述高强度聚焦超声设备采用病人移动之前的操作参数继续操作;否则,再次执行定位所述病床的步骤及其后续步骤。 The present invention discloses a method for high-intensity focused ultrasound device operating parameters may be used again, the method comprising: before the patient moves, the patient using magnetic resonance imaging device for scanning, before the moving image; patient movement occurs Thereafter, the patient positioning the carrier bed, according to the former moving image with the scanning parameters, using the magnetic resonance imaging apparatus to scan a patient again, to give the moving image; the before and after the moving image and moving image, determine whether the patient moves difference before and after the position is acceptable, and if so, the use of high intensity focused ultrasound device prior to operating parameters of patient movement continues; otherwise, performing step and the subsequent step of positioning the bed again. 采用该方法,使得在病人发生移动之后高强度聚焦超声设备仍能采用病人发生移动之前的操作参数。 With this method, the patient moves such that after high-intensity focused ultrasound device prior to operating parameters can still use the patient moves.

Description

使高强度聚焦超声设备的操作参数可再度使用的方法 The method of the high-intensity focused ultrasound device operating parameters may be used again

技术领域 FIELD

[0001] 本发明涉及磁共振成像(MRI)监控的高强度聚焦超声(HIFU)技术领域,特别是一种使高强度聚焦超声设备的操作參数可再度使用的方法。 [0001] The present invention relates to a magnetic resonance imaging (MRI) to monitor high intensity focused ultrasound (HIFU) technology, and more particularly a method of operating parameters of the high-intensity ultrasound apparatus may be used to focus again.

背景技术 Background technique

[0002] 在磁共振成像监控的高强度聚焦超声(MRI guided HIFU)设备中,通常由磁共振成像设备进行扫描,得到病人相关部位的图像,然后高强度聚焦超声设备将磁共振成像设备扫描得到的图像作为參考图像,进行操作,从而利用超声波对病人进行治疗。 [0002] High intensity focused ultrasound to monitor the magnetic resonance imaging (MRI guided HIFU) device, typically scanned by a magnetic resonance imaging apparatus, to obtain images of the patient relevant parts, and high intensity focused ultrasound scanning device to obtain a magnetic resonance imaging apparatus the image as a reference image, an operation to treat a patient using ultrasound.

[0003] 一般而言,高强度聚焦超声设备的操作时间较长,通常会达到数个小时。 [0003] In general, high intensity focused ultrasound device longer operating time, typically up to several hours. 在这么长的时间内,很难让病人保持静止不动。 In such a long time, difficult for the patient to keep still. 在病人发生移动之后,由于病人的位置发生了变化,使得高强度聚焦超声设备的操作环境也相应地发生了变化,而不能采用病人发生移动之前的操作參数。 After the patient moves, because the patient's position changes, so that the high intensity focused ultrasound device operating environment changes accordingly, and not with the operating parameters of the patient before moved. 这就需要重新确定高强度聚焦超声设备的新的操作參数,不仅增加了高強度聚焦超声设备的无用操作,而且还増加了病人的等待时间。 This need to redefine the new operating parameters of high-intensity focused ultrasound equipment, not only increases the useless operation of high-intensity focused ultrasound equipment, but also to increase in the waiting time for patients.

[0004] 因此,期望能够在病人发生移动之后高强度聚焦超声设备仍然可以使用病人发生移动之前的操作參数。 [0004] Accordingly, it is desirable can be high intensity focused ultrasound device after the patient moves the operating parameters can still be used before the patient moves.

发明内容 SUMMARY

[0005] 有鉴于此,本发明提出了一种使高强度聚焦超声设备的操作參数可再度使用的方法,用以使得在病人发生移动之后高强度聚焦超声设备仍能采用病人发生移动之前的操作參数。 [0005] Accordingly, the present invention provides an operating parameter so that high intensity focused ultrasound device reusable method for such a patient moves after high intensity focused ultrasound device prior to patient movement can still occur using operating parameters.

[0006] 因此,本发明提供了一种使高强度聚焦超声设备的操作參数可再度使用的方法,该方法包括: [0006] Accordingly, the present invention provides a method for the high-intensity focused ultrasound device operating parameters may be used again, the method comprising:

[0007] 在病人发生移动之前,使用磁共振成像设备对病人进行扫描,得到移动前图像; [0007] before the patient moves, the patient using magnetic resonance imaging device for scanning, before the moving image;

[0008] 在病人发生移动之后,定位承载病人的病床,按照所述移动前图像所用扫描參数,使用所述磁共振成像设备对病人再次进行扫描,得到移动后图像; [0008] After the patient moves, the patient positioning the carrier bed, before and after the moving image according to the scan parameters, the magnetic resonance imaging apparatus using the patient scanned again to obtain moving images;

[0009] 根据所述移动前图像和移动后图像,判断病人移动前后的位置差异是否可接受,如果是,则所述高强度聚焦超声设备采用病人移动之前的操作參数继续操作;否则,再次执行定位所述病床的步骤及其后续步骤。 [0009] The front of the moving image and moving image, determines a position difference before and after patient movement is acceptable, and if so, the use of high intensity focused ultrasound device prior to operating parameters of patient movement continues; otherwise, again performing the step of positioning the bed and the subsequent steps.

[0010] 优选地,判断病人移动前后的位置差异是否可接受的步骤包括: [0010] Preferably, the step of determining the position difference before and after patient movement is acceptable comprises:

[0011] 分割所述移动前图像和移动后图像中的感兴趣区域,计算所述移动前图像和移动后图像中所述感兴趣区域的关联度,判断所述关联度是否大于或大于等于ー个阈值。 [0011] In the divided region of interest in the image after the moving image and the moving front after computing the moving image before the moving image and the degree of association in the region of interest, determining the degree of association is greater than greater than or equal ーthresholds.

[0012] 该方法可以进一歩包括:增强所述移动前图像和移动后图像中所述感兴趣区域的边缘,以便于所述分割。 [0012] The method may include feeding a ho: Enhanced region of the front edge and the rear of the moving image in the moving image of interest, in order to facilitate the division.

[0013] 优选地,使用坎尼算子来检测所述感兴趣区域的边缘。 [0013] Preferably, Canny operator is used to detect the edge area of ​​interest.

[0014] 该方法可以进一歩包括:使所述移动后图像与移动前图像中的体素大小相同。 [0014] The method may enter a ho comprising: moving the same image after the voxel size of the image before moving.

[0015] 所述关联度的计算采用以下公式:[0017] Calculating the [0015] degree of association using the following formula: [0017]

Figure CN101766494BD00041

[0018] 其中,f(t)是移动前图像和移动后图像中感兴趣区域的关联度,If是移动前图像中的感兴趣区域,It是移动后图像中的感兴趣区域,P是移动前图像中感兴趣区域的位置,t是移动后图像中感兴趣区域相对于移动前图像中感兴趣区域的平移,η是重叠区域O中所考虑的点数,Tf和Tt是在重叠区域O中计算移动前图像中感兴趣区域和移动后图像中感兴趣区域的像素值的算木平均。 [0018] where, f (t) is a moving image and the moving front of the associated region of interest in the image, If the former is a region of interest in the moving image, It is the region of interest in the moving image, P is moved region of interest in the image before the position, t is the moving image area of ​​interest with respect to translational movement before the image region of interest, η is the number of points in the overlap region considered O, Tf and Tt are in the overlapping region O before calculating a moving image of interest in wood calculated average pixel value of the region of interest and the region of the moving image.

[0019] 优选地,对所述移动前图像和移动后图像进行下采样处理。 [0019] Preferably, the moving images before and after the sampling process and the moving image.

[0020] 该方法进ー步包括:在病人移动前后的位置差异可接受的情况下,使用所述移动后图像为參考图像。 [0020] The method further comprises feeding ー: at position difference before and after patient movement acceptable, the use of the moving image as a reference image.

[0021] 优选地,在采用病人移动之前的操作參数继续操作之前,计算所述移动前图像与移动后图像之间的偏移矢量,根据所述偏移矢量计算高强度聚焦超声设备的焦点轨迹的偏移量,并应用于病人移动之前的操作參数。 [0021] Preferably, before using the operating parameters of patient movement continues until the operation is calculated before and after the moving image and the disparity vector between a moving image, high intensity focused ultrasound focus calculation apparatus according to said displacement vector track offset, it is applied to the operating parameters before and patient movement.

[0022] 从上述方案中可以看出,由于本发明在病人发生移动前后分别使用磁共振成像设备扫描得到移动前图像和移动后图像,然后根据移动前图像和移动后图像来判断病人移动前后的位置差异是否可接受,如果是则高强度聚焦超声设备继续采用在病人发生移动之前使用的操作參数,从而使得高强度聚焦超声设备在病人发生移动之前的操作參数能够再度使用,避免了再次确定操作參数所需的操作和时间,提高了磁共振成像监控的高强度聚焦超声设备的使用效率。 [0022] As can be seen from the above embodiment, since the forward and backward scans were obtained using a magnetic resonance imaging apparatus before and after the moving image and moving images before and after the moving image according to the image and moving back and forth movement of the patient to determine the occurrence in the patient of the present invention, positional difference is acceptable, if the high-intensity focused ultrasound device continue operating parameters used before the patient moved, so that the high intensity focused ultrasound device can be used again in the operating parameters of the patient moves before, again to avoid and determining the time required for operation of the operating parameters, more efficient use of high intensity focused ultrasound to monitor the magnetic resonance imaging apparatus.

附图说明 BRIEF DESCRIPTION

[0023] 图I为根据本发明实施例的流程图。 [0023] Figure I is a flow diagram of the embodiment of the present invention.

具体实施方式 detailed description

[0024] 为使本发明的目的、技术方案和优点更加清楚,以下举实施例对本发明进ー步详细说明。 [0024] To make the objectives, technical solutions, and advantages of the invention more apparent, the following embodiments give examples of the present invention is further described in detail ー feed.

[0025] 本发明的核心思想是,利用病人移动前后的MRI图像判断病人发生移动前后的位置差异是否可接受,如果是,则高强度聚焦超声设备继续采用病人发生移动之前的操作參数,否则再次定位病床、扫描图像并进行判断。 [0025] The core idea of ​​the present invention, MRI image is determined by the patient to move the patient before and after occurrence position difference before and after movement is acceptable, and if so, the high intensity focused ultrasound device prior to continue operating parameters of the patient moves, or positioning the bed again, and the scanned image is determined.

[0026] 图I是根据本发明实施例的流程图。 [0026] Figure I is a flowchart of an embodiment of the present invention. 如图I所示,本发明实施例的方法包括以下步骤: FIG I, the method of an embodiment of the present invention comprises the steps of:

[0027] 步骤110,高强度聚焦超声设备使用ー套操作參数对病床上的病人进行操作。 [0027] Step 110, the use of high intensity focused ultrasound device ー sets the operating parameters of the patient on the bed operates.

[0028] 步骤120,病人将要发生移动时,例如病人需要活动ー下或其他原因而在病床上运动或者离开病床。 [0028] Step 120, the patient moves to occur, such as a patient or the need for other reasons activity ー moves in bed or out of bed. 在病人发生移动之前,利用磁共振成像设备对病人进行扫描,得到移动前图像。 Before the patient moves, the patient using magnetic resonance imaging device for scanning, before the moving image.

[0029] 本发明实施例优选地扫描病人被高强度聚焦超声设备操作的部位,从而得到病人身体一定体积的图像。 [0029] Example image scanning the patient sites are preferably focused ultrasound device operating embodiment of the present invention, high strength, thereby obtaining a volume of the patient's body. 优选地,本实施例扫描得到3D图像。 Preferably, embodiments of the present embodiment to obtain 3D scan image. [0030] 步骤130,病人发生移动,例如病人离开病床,或者病人在病床上挪动、转动等。 [0030] Step 130, the patient moves, for example, the patient leaves the bed, moving bed or in a patient, the rotation and the like.

[0031] 步骤140,在病人发生移动之后,将病人重新放置在病床上,并将承载着病人的病床移入磁共振成像设备的磁体,利用磁共振成像设备自身的定位装置定位病床。 [0031] Step 140, after the patient moves, the patient will be placed back in bed, the patient's bed and carrying the transferred magnet magnetic resonance imaging apparatus, magnetic resonance imaging apparatus using positioning means for positioning the bed itself.

[0032] 步骤150,利用磁共振成像设备对病人进行扫描,所用扫描參数与病人发生移动之前的扫描(即,步骤120中的扫描)的扫描參数相同,得到移动后图像。 [0032] Step 150, the patient using magnetic resonance imaging apparatus is scanned, the scan parameters prior to scan with the patient moves (i.e., YES in step 120 scans) the scanning of the same parameters, to obtain the moving image.

[0033] 由于采用相同的扫描參数,所以这次扫描所扫描的部位与病人发生移动前所扫描的部位大致相同或者接近。 Parts [0033] As a result of the same scan parameters, the scan of the scanned portion of the patient before the scanning movement occurs substantially the same as or close.

[0034] 步骤160,磁共振成像设备分割移动前图像和移动后图像,分别提取感兴趣区域(ROI)。 [0034] Step 160, the magnetic resonance imaging apparatus and a moving image is divided before the moving image, the region of interest were extracted (ROI). 这里的感兴趣区域例如是病人器官、组织等,特别是高强度聚焦超声设备所要操作的对象。 Here, for example, a patient region of interest organs, tissues and the like, especially high-intensity focused ultrasound device to be operated object.

[0035] 在分割感兴趣区域的过程中,主要通过感兴趣区域的边缘来分割,可以采用多种方法来检测感兴趣区域的边缘,优选地,在本实施例中采用坎尼(Canny)算子来检测感兴趣区域的边缘。 [0035] In the process of dividing the area of ​​interest, divided mainly by the edge region of interest, various methods can be used to detect an edge region of interest preferably using Canny (the Canny) In the present embodiment, operator detects an edge of the sub-region of interest.

[0036] 在提取感兴趣区域之前,还可以增强感兴趣区域的边缘,以便于更好地分割感兴趣区域。 [0036] Before extracting the region of interest, but also can enhance the edge region of interest, in order to better the divided region of interest.

[0037] 另外,由于磁共振成像设备扫描得到的移动前图像和移动后图像的采样点较多,对这样的图像进行处理会导致巨大的计算量。 [0037] Further, since the front image and the large movement of the mobile magnetic resonance imaging apparatus obtained by scanning the sample points of the image, such an image is processed to cause a huge amount of computation. 为了减少磁共振成像设备的计算量,本实施例可以进ー步对移动前图像和移动后图像进行下采样处理,例如将256*256下采样至64*64。 In order to reduce the amount of calculation of the magnetic resonance imaging apparatus, the present embodiment may further ー former into a moving image and rear moving image sampling processing, for example, down-sampled to 64 * 64 256 * 256.

[0038] 步骤170,根据移动前图像和移动后图像中的感兴趣区域,判断病人移动前后的位置差异是否可接受,如果可接受,则执行步骤180及其后续步骤,否则执行步骤140及其后续步骤。 [0038] Step 170, according to the former moving image and the moving image a region of interest, determining the position difference before and after patient movement is acceptable, if acceptable, step 180 and subsequent steps is performed, otherwise, step 140 is executed and subsequent step.

[0039] 本实施例可以采用多种方法来判断病人移动前后的位置差异是否可接受。 [0039] The present embodiment may employ a variety of methods to determine the position difference before and after patient movement is acceptable.

[0040] 这里介绍ー种利用感兴趣区域的关联度的方法。 [0040] The method describes use of species ー relevance region of interest here. 计算移动前图像和移动后图像中感兴趣区域的关联度,判断所述关联度是否大于或大于等于一个预先设置的阈值。 After calculating the moving image and the moving front of the associated region of interest in the image, determining the degree of association is greater than or equal to a value greater than a threshold set in advance. 当关联度大于或大于等于阈值,说明移动后图像中的感兴趣区域与移动前图像中的感兴趣区域的位置比较接近,病人发生移动前后的位置差异为可接受;否则,说明移动后图像中的感兴趣区域与移动前图像中的感兴趣区域的位置相差较大,病人发生移动前后的位置差异为不可接受。 When the degree of association is greater than greater than or equal to a threshold, indicating the position of the region of interest and the region of interest in the image before the moving image is moving closer to the position difference before and after the occurrence of patient motion is acceptable; otherwise, indicating the moving image the position of the region of interest and the region of interest in the image before moving large difference, the position difference before and after the occurrence of unacceptable move the patient.

[0041] 本发明实施例还给出了一种计算上述关联度的方法,该方法采用下列公式: [0041] Embodiments of the invention also gives a method of the above correlation calculation, the method using the following equation:

[0042] AO = Σ メ々)- [0042] AO = Σ メ 々) -

{Σ 一)[/,(P + ,)-/,]2}1/2 {Σ a) [/, (P +,) - /,] 2} 1/2

[0043]其中,7/ =丄Σ7バ^7),7'=丄Σ7» O [0043] wherein, 7/7 ^ = Shang Σ7 ba), 7 '= Shang Σ7 »O

[0044] 在上面的公式中,f(t)是移动前图像和移动后图像中感兴趣区域的关联度,If是移动前图像中的感兴趣区域,It是移动后图像中的感兴趣区域,P是移动前图像中感兴趣区域的位置,t是移动后图像中感兴趣区域相对于移动前图像中感兴趣区域的平移,η是重叠区域O中所考虑的点数,Tf和ΐ,是在重叠区域O中计算移动前图像中感兴趣区域和移动后图像中感兴趣区域的像素值的算术平均。 [0044] In the above equation, f (t) is a moving image and the moving front of the associated region of interest in the image, If the former is a region of interest in the moving image, It is the region of interest in the moving image , P is the position prior to moving the region of interest in the image, t is the moving image region of interest with respect to translational movement before the image region of interest, η is the number of points in the overlap region considered O, Tf and ΐ, are interest in the image region arithmetic mean value of the pixel of interest in the image region after the movement of the front and mobile computing in the overlap region O. [0045] 另外,在病人移动前和移动后扫描所得的图像中,体素(voxel)的大小有可能不一祥。 [0045] Further, in the image of the scanned patient before and after the move, the size of voxels (a voxel) is likely to vary Cheung. 在本流程中,在计算关联度之前还可以进ー步包括一个使移动前图像中的体素与移动后图像中的体素大小相等的步骤。 In the present process, before calculating the degree of association may also include a further step of feeding ー rear voxel moving the moving image before the image voxels of equal size to make.

[0046] 步骤180,高强度聚焦超声设备以移动后图像作为參考图像,来进行后续的操作。 [0046] Step 180, the high intensity focused ultrasound device to the moving image as a reference image for subsequent operations.

[0047] 步骤190,高强度聚焦超声设备采用病人发生移动前的操作參数继续进行操作,而不需要重新确定操作參数。 [0047] Step 190, using high intensity focused ultrasound device operating parameters before the patient moved proceed without re-determining operation parameters.

[0048] 在病人发生移动前后,高强度聚焦超声设备所操作的部位很可能会发生ー些移动,那么在病人移动前后的位置差异可接受的情况下,可以进ー步计算所述移动前图像与移动后图像之间的偏移矢量,然后根据该偏移矢量计算高强度聚焦超声设备的焦点的偏移量,并将这个偏移量应用于病人移动之前的操作參数(尤其是空间位置这种參数以及与空间位置相关的參数),高强度聚焦超声设备采用这些操作參数继续进行后续操作。 [0048] before and after the patient moves, high intensity focused ultrasound device is likely to be operated ー some portion moves, then in the position difference before and after patient movement acceptable, may be calculated from the previous step ー into the moving image and the disparity vector between a moving image, the disparity vector and then calculate an offset high intensity focused ultrasound device according to the focus, and this offset is applied to the operating parameters (in particular the spatial position prior to movement of the patient such parameters, and space-related parameters position), high intensity focused ultrasound device uses these parameters to continue operations proceed.

[0049] 以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,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保护范围之内。 [0049] The foregoing is only preferred embodiments of the present invention but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, the, equivalent substitutions, improvements should be included in the within the scope of the present invention.

Claims (8)

  1. 1. 一种使高强度聚焦超声设备的操作參数可再度使用的方法,该方法包括: 在病人发生移动之前,使用磁共振成像设备对病人进行扫描,得到移动前图像; 在病人发生移动之后,定位承载病人的病床,按照所述移动前图像所用扫描參数,使用所述磁共振成像设备对病人再次进行扫描,得到移动后图像; 根据所述移动前图像和移动后图像,判断病人移动前后的位置差异是否可接受,如果是,则所述高强度聚焦超声设备采用病人移动之前的操作參数继续操作;否则,再次执行定位所述病床的步骤及其后续步骤; 其中,在采用病人移动之前的操作參数继续操作之前,计算所述移动前图像与移动后图像之间的偏移矢量,根据所述偏移矢量计算高强度聚焦超声设备的焦点轨迹的偏移量,并应用于病人移动之前的操作參数,其中所述操作參数是空间位置參数 A method of operating parameters of the high-intensity ultrasound apparatus may be used again focusing, the method comprising: before the patient moves, the patient using magnetic resonance imaging device for scanning, before the moving image; movement occurs after the patient positioning the carrier beds of patients, according to the former moving image with the scanning parameters, using the magnetic resonance imaging apparatus to scan a patient again, to give the moving image; the before and after the moving image and moving image, determine whether the patient moves difference before and after the position is acceptable, and if so, the use of high intensity focused ultrasound device prior to operating parameters of patient movement continues; otherwise, performing the step of positioning the bed and the subsequent steps again; wherein, in use the patient before moving operation parameter before operation continues, calculates the disparity vector between the moving image before and after the moving image, the offset amount of the high intensity focused ultrasound focal track apparatus according to said displacement vector is calculated, and applied before moving the operating parameters of a patient, wherein said operating parameter is the spatial position parameter .
  2. 2.根据权利要求I所述的方法,其特征在于,判断病人移动前后的位置差异是否可接受的步骤包括: 分割所述移动前图像和移动后图像中的感兴趣区域,计算所述移动前图像和移动后图像中所述感兴趣区域的关联度,判断所述关联度是否大于或大于等于ー个阈值。 2. The method as claimed in claim I, wherein determining the position difference before and after patient movement is acceptable comprises: dividing a region of interest before and after the moving image and moving image, calculating the movement of the front after moving image and the image of the region of interest associated with determining the degree of association is greater than greater than or equal to a threshold ー.
  3. 3.根据权利要求2所述的方法,其特征在于,该方法进ー步包括:增强所述移动前图像和移动后图像中所述感兴趣区域的边缘,以便于所述分割。 3. The method according to claim 2, characterized in that, the method proceeds ー further comprising: an edge enhanced image areas before and after the movement of said moving image of interest, in order to facilitate the division.
  4. 4.根据权利要求3所述的方法,其特征在于,使用坎尼算子来检测所述感兴趣区域的边缘。 4. The method according to claim 3, characterized in that a Canny operator to detect the edge area of ​​interest.
  5. 5.根据权利要求I或2所述的方法,其特征在于,该方法进ー步包括:使所述移动后图像与移动前图像中的体素大小相同。 5. The method of claim I or claim 2, characterized in that, the method proceeds ー step comprises: making the same voxel size after the moving image before the moving image.
  6. 6.根据权利要求2所述的方法,其特征在于,所述关联度的计算采用以下公式: 6. The method according to claim 2, wherein the degree of association is calculated using the following formula:
    Figure CN101766494BC00021
    其中 among them
    Figure CN101766494BC00022
    其中,f(t)是移动前图像和移动后图像中感兴趣区域的关联度,If是移动前图像中的感兴趣区域,It是移动后图像中的感兴趣区域,P是移动前图像中感兴趣区域的位置,t是移动后图像中感兴趣区域相对于移动前图像中感兴趣区域的平移,η是重叠区域O中所考虑的点数,If和It是在重叠区域O中计算移动前图像中感兴趣区域和移动后图像中感兴趣区域的像素值的算木平均。 Wherein, f (t) is a moving image and the moving front of the associated region of interest in the image, If the former is a region of interest in the moving image, It is the region of interest in the moving image, P is the image before moving the position of the region of interest, t is the moving image region of interest with respect to translational movement before the image region of interest, η is the number of points in the overlap area O considered, If It is a front and a mobile computing in the overlap region O after the image region of interest and the pixel value of the region of interest moving image calculated average wood.
  7. 7.根据权利要求I或2所述的方法,其特征在干,对所述移动前图像和移动后图像进行下采样处理。 7. The method of claim I or claim 2, characterized in that the dry, before the next image after the moving image and moving sampling process.
  8. 8.根据权利要求I所述的方法,其特征在于,该方法进ー步包括:在病人移动前后的位置差异可接受的情况下,使用所述移动后图像为參考图像。 8. The method as claimed in claim I, wherein the method further comprises feeding ー: at position difference before and after patient movement acceptable, the use of the moving image as a reference image.
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