CN104287757A - Method and system for reconstructing computer X-ray tomography imaging of object image - Google Patents

Method and system for reconstructing computer X-ray tomography imaging of object image Download PDF

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CN104287757A
CN104287757A CN201310295676.3A CN201310295676A CN104287757A CN 104287757 A CN104287757 A CN 104287757A CN 201310295676 A CN201310295676 A CN 201310295676A CN 104287757 A CN104287757 A CN 104287757A
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data
scanning
scan
ray
computer tomography
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CN201310295676.3A
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孙智慧
李硕
贾磊
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Ge医疗系统环球技术有限公司
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Publication of CN104287757A publication Critical patent/CN104287757A/en

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Abstract

The invention provides a method for reconstructing computer X-ray tomography imaging of an object image. The method is characterized in that first scanning is conducted on an object through first scanning vision so as to obtain first data; second scanning is conducted on the object through second scanning vision so as to obtain second data; the first data and the second data are combined to generate combination data; the object image is reconstructed through the combination data; the second scanning vision is included in the first scanning vision. The invention further provides a corresponding system for reconstructing computer X-ray tomography imaging of the object image.

Description

用于重构对象图像的计算机X射线断层成像的方法和系统 A method for reconstructing an image of an object X-ray computer tomography systems, and

技术领域 FIELD

[0001] 本发明总体上涉及计算机断层摄影(CT)X射线成像,更特别地涉及降低辐射量的计算机断层摄影(CT)X射线成像。 [0001] The present invention relates to a computer tomography (CT) X-ray imaging in general, and more particularly relates to reducing the amount of radiation computed tomography (CT) X-ray imaging.

背景技术 Background technique

[0002] 本部分中描述的方法能够被实行,但未必是已被预先构思或实行的方法。 [0002] The method described in this section can be implemented, but not necessarily been previously conceived or pursued. 因此,除非在本文中另外指明,否则本部分中描述的方法对于本申请中的权利要求而言不是现有技术并且不通过包括在本部分中而被承认为现有技术。 Therefore, unless otherwise indicated herein, or the method described in this section for the present application is not prior art to the claims and not by inclusion in this section it is admitted to be prior art. 此外,本发明的所有实施例不必解决在本部分中提出的问题中的全部(或甚至任一个)。 Furthermore, all embodiments of the present invention need not address the issues raised in this section are all (or even any of a).

[0003] 辅助诊断装置包括磁共振(MR)系统、超声系统、计算X射线断层摄影(CT)系统、正电子发射X射线断层摄影(PET)系统、核医疗和其他类型的成像系统。 [0003] diagnosis apparatus comprises a magnetic resonance (MR) systems, ultrasound systems, X-ray tomographic calculating (CT) systems, positron emission X-ray tomographic (PET) system, nuclear medicine, and other types of imaging systems.

[0004] 例如,在采用CT系统对病人进行CT X射线成像中,X射线用于对病人身体的内部结构和感兴趣区(ROI)的特征进行成像。 [0004] For example, in the patient X-ray CT imaging, X-rays of a patient's body wherein the inner structure and the region of interest (ROI) of a CT imaging system. 该成像由CT扫描器完成,CT扫描器可以使用提供扇形X射线束的单切片扫描器和提供锥形X射线束的多切片扫描器。 The completion of the image by a CT scanner, CT scanner may use the fan-shaped X-ray beam and a single slice scanners provide a multi-slice X-ray cone beam scanner. 操作时,以规定的SFOV (scan field of view:扫描视野)对摄影对象进行扫描并收集原始数据,而后对相应于SFOV的DFOV(display field of view:显示视野)的图像进行重构。 In operation, a predetermined SFOV (scan field of view: the scan field of view) to scan the photographic subject and the collected raw data, then the corresponding to SFOV DFOV (display field of view: displaying the field of view) of the image reconstructed.

发明内容 SUMMARY

[0005] 随着CT摄影技术的飞速发展,造影剂增强CT扫描、CT灌注成像、心脏CT血管造影、4D CT等的出现,在提高了图像质量的同时,也带来了新的问题。 [0005] With the rapid development of CT scanning technology, contrast-enhanced CT scans, CT perfusion imaging, cardiac CT angiography, 4D CT, etc. appear in the image quality is improved, but also brought new problems. 因为这些技术都需要对目标区域反复的扫描(无论是否使用造影剂),而对于诊断而言有价值的感兴趣区可能只是SFOV的一部分,这样,就增加了X射线的辐射剂量,而这会对病人的健康不利。 Because these techniques require repeated scanning of the target area (with or without contrast agents), while in terms of value for the diagnosis of the region of interest may be only part of SFOV, thus, increases the radiation dose X-rays, which will detrimental to the patient's health. 因此,降低CT扫描期间的辐射剂量具有很高的临床价值。 Therefore, reducing the radiation dose during CT scans with high clinical value.

[0006] 因此,需要一种降低CT扫描期间的辐射剂量的方法和装置。 [0006] Thus, the methods and apparatus of the radiation dose during a CT scan of a need to reduce.

[0007] 为此,根据本发明的一方面,提供一种用于重构对象图像的计算机X射线断层成像的方法,其特征在于:通过以第一扫描视野对对象进行第一扫描以获得第一数据;通过以第二扫描视野对对象进行第二扫描以获得第二数据;将第一数据与第二数据结合生成结合数据;以及利用结合数据重构出对象图像;其中第二扫描视野包括在第一扫描视野之内。 [0007] To this end, according to an aspect of the present invention, there is provided a method of reconstructing an object image of an X-ray computer tomography for imaging, wherein: scanning a first field of view by an object is to obtain a first scan of a transactions; by scanning a second field of view of a second object to obtain a second scanned data; first and second data to generate combined binding data; and the image reconstructed using the combined data of the object; wherein the second field of view scan comprising in a first scan of the field of view.

[0008] 根据本发明的另一方面,还提供一种用于重构物理图像的计算机X射线断层成像的系统,其特征在于,包括:扫描装置,利用X射线通过以第一扫描视野对对象进行第一扫描以获得第一数据,并利用X射线通过以第二扫描视野对对象进行第二扫描以获得第二数据,其中第二扫描视野包括在第一扫描视野之内;结合装置,用于将第一数据与第二数据结合生成结合数据;重构装置,利用结合数据重构出对象图像。 [0008] According to another aspect of the present invention, there is provided an X-ray computer tomography system physical reconstructed image, characterized by comprising: scanning means, using X-rays by scanning the first field of view of the object performing a first scan data to obtain a first and a second X-ray scanning by the second scanning field of view of the object to obtain a second data, wherein the second field of view comprising scanning in a first scan of the field of view; binding means, with binding to the first and second data to generate combined data; reconstruction means, using the binding data reconstructed object image.

附图说明 BRIEF DESCRIPTION

[0009] 为了更透彻地理解本公开的内容,下面参考结合附图所进行的下列描述,在附图中: [0009] For a more complete understanding of the present disclosure, with reference to the following description taken in conjunction with the following drawings, in which:

[0010] 图1是根据本发明的CT成像系统的构造图; [0010] FIG. 1 is a configuration diagram of a CT imaging system according to the present invention;

[0011] 图2是图1中所示的系统的示意框图; [0011] FIG. 2 is a schematic block diagram of the system shown in Figure 1;

[0012] 图3是根据本发明实施例的针对ROI的SFOV的示意图; [0012] FIG. 3 is a schematic diagram for the ROI SFOV embodiment of the present invention;

[0013] 图4是根据本发明一个实施例的方法的流程图; [0013] FIG. 4 is a flowchart of a method embodiment of the present invention;

[0014] 图5是根据本发明另一个实施例的方法的流程图; [0014] FIG. 5 is a flowchart of a method according to another embodiment of the present invention;

[0015] 图6是仅进行局部扫描后重构的图像; [0015] FIG. 6 is reconstructed after only partially scanned image;

[0016] 图7是对全局SFOV进行扫描后重构的图像; [0016] FIG. 7 is a remodeling SFOV global scanning an image;

[0017] 图8是根据本发明一个实施例的方法得到的图像; [0017] FIG 8 is an image obtained by a method according to an embodiment of the present invention;

[0018] 图9示出了采用完全叠加的投影数据结合的方式; [0018] FIG. 9 shows a superimposed manner using projection data fully bonded;

[0019] 图10示出了采用部分叠加的投影数据结合的方式; [0019] FIG. 10 illustrates a manner superposed portions of the projection data using the binding;

[0020] 图11示出了进行过渡处理时应用到全部通道的投影数据的加权函数。 [0020] FIG. 11 illustrates a weighting function applied to projection data of all channels when a transition process.

具体实施方式 Detailed ways

[0021] 在下面的详细描述中,参考作为其一部分的附图,其中以图示的方式示出了其中可以实现本发明的具体实施例。 [0021] In the following detailed description, with reference to the accompanying drawings as a part thereof, wherein by way of illustration specific embodiments in which the present invention may be implemented. 以足够的细节描述这些实施例,使得本领域技术人员能够实现本发明,并且应该理解在不脱离本发明各个实施例的范围的情况下,可对实施例进行组合,或者可以利用其他实施例并且可以做出结构、逻辑和电气上的变化。 In sufficient detail description of these embodiments so that those skilled in the art to practice the invention, and it should be understood that the scope embodiment without departing from the present invention each may be combined embodiment, or may use other embodiments and It may be made structural, logical and electrical changes. 因此,下面的详细描述不应该被视作限制性的,而应是说明性的。 Accordingly, the following detailed description should not be considered as limiting, but rather illustrative. 本发明的范围是由随附的权利要求书及其等同物限定的。 The scope of the invention being indicated by the appended claims and equivalents thereof.

[0022] 参考图1和2,计算机X射线断层摄影(CT)成像系统10示出为包括扫描架12,其代表“第三代” CT扫描仪。 [0022] Referring to Figures 1 and 2, X-ray computer tomography (CT) imaging system 10 is shown as a "third generation" CT scanner includes a gantry 12 representative thereof. 扫描架12具有X射线源14,其将X射线束16朝检测器组装件18投射在扫描架12的相反侧上。 The gantry 12 has an X-ray source 14 that the X-ray beam 16 toward a detector assembly 18 is projected on the opposite side of the gantry 12. 在本发明的实施例中,X射线源14包括静止靶或旋转靶。 In an embodiment of the present invention, X-ray source 14 includes a stationary target or a rotating target. 检测器组装件18由多个检测器20和数据获取系统(DAS) 32形成。 Detector assembly 18 acquisition system (DAS) by a plurality of data detectors 32 and 20 are formed. 所述多个检测器20感测穿过医疗患者22的投影的X射线,其中每个检测器20产生模拟电信号,其表示碰撞X射线束以及由此当其通过患者22时的衰减束的强度。 The detector 20 senses the plurality of projection through a medical patient 22. X-rays, wherein each detector produces an analog electrical signal 20, which represents a collision when the X-ray beam and hence the attenuated beam 22 by the patient strength. 检测器阵列18可以被制造为单切片或多切片配置。 Detector array 18 may be fabricated as a single slice or multi-slice configuration. 检测器20通常包括用于使在检测器接收的X射线束准直的准直器、邻近准直器的用于将X射线转换为光能的闪烁体(scintillator)、以及用于接收来自于邻近闪烁体的光能以及从其产生电信号的光电二极管。 Detector 20 generally includes an X-ray beam for receiving the collimated detector collimator, adjacent the collimator for the X-ray conversion scintillator into light energy (scintillator), and for receiving from adjacent to the scintillator and optical energy from an electrical signal generated by the photodiode. 通常,闪烁体阵列的每个闪烁体将X射线转换为光能。 Typically, each scintillator of a scintillator array converts X-rays into light energy. 每个闪烁体将光能释放至邻近其的光电二极管。 Each scintillator discharges light energy to a photodiode adjacent thereto. 每个光电二极管检测光能并生成对应的电信号检测器阵列18的每个检测器20产生单独的电信号,该电信号代表撞击辐射束(例如X射线束)的强度并且因此可以用于估计在辐射束穿过物体或患者22是辐射束的衰减。 Each photodiode detects the light energy and generates a corresponding electrical signal detector array 18, each detector 20 generates a separate electrical signal representative of impinging radiation beam (e.g. the X-ray beam) and thus the intensity can be used to estimate in the radiation beam passes through object or patient 22 is the attenuation of the radiation beam.

[0023] 图2只示出了单行检测器20。 [0023] FIG. 2 shows a single row of detector 20. 然而,多切片检测器阵列18可以包括多个平行的单行检测器20,使得可以在一个扫描期间同时采集对应于多个准平行或平行的切片的投影数据。 However, multi-slice detector array 18 may comprise a plurality of parallel single-row detector 20, so that the corresponding slices to be acquired a plurality of quasi-parallel or parallel projection data at the same time during a scan.

[0024] 在获取X射线投影数据的扫描期间,扫描架12和其上安装的组件围绕旋转中心24旋转。 [0024] During the scan acquired X-ray projection data, gantry 12 and the components mounted thereon about a center of rotation 24. 扫描架12的旋转和X射线源14的操作可通过CT系统10的控制机构26来管控。 Operation of the rotating gantry 12 and the X-ray source 14 by the control mechanism 26 of CT system 10 to control. 控制机构26包括X-射线控制器28,其提供电力和定时信号给X射线源14和机架电机控制器30,该机架电机控制器30控制扫描架12的旋转速度和位置。 26 comprises a control mechanism 28 that provides power and timing signals to the X-ray source 14 and a gantry motor controller 30, the gantry motor controller 30 controls the rotational speed of gantry 12 and the position of the X- ray controller. 控制机构26中的数据采集系统DAS32采样来自检测器20的模拟数据并将该数据转换为数字信号供后续处理。 Data acquisition system control means 26 DAS32 sampled analog data from detector 20 and converts the data to digital signals for subsequent processing. DAS32输出包括在特定机架旋转角度(例如视角)获得的衰减测量的投影数据集。 DAS32 output including attenuation measurements obtained in a particular gantry rotation angle (e.g., view angle) projection data sets. 在扫描架12旋转时,可以在单个旋转期间获得多个视图。 When the rotating gantry 12, a plurality of views may be obtained during a single rotation. 单个旋转时扫描架12的一个完整的360度旋转。 A gantry full 360 degrees of rotation 12 single rotation. 每个视图具有对应的视角,和在扫描架12上的特定位置。 Each has a corresponding perspective view, and a specific position on the gantry 12. 在一次扫描架12旋转中可获得至少一千个视图(例如,每个视角约为0.36度)。 Views obtained at least one thousand (e.g., about 0.36 degrees for each angle of view) in a 12 rotating the gantry. 如下所述,可以给每个视图分配对应的视角。 As described below, you may be assigned to each corresponding perspective view. 然而,视图可以占据视角的一个范围(例如,132.2度到135.7度)。 However, the view can occupy a range (e.g., 132.2 ° to 135.7 °) viewing angle. 可选地,可获得一组视图(例如子集),其中每个视图可由间隔分开。 Alternatively, a set of views can be obtained (e.g., a subset), wherein each of the views may be spaced apart. 该间隔可由用户选择或预编程到系统中,并且可以是固定的或可变的。 This interval is user-selectable or pre-programmed into the system, and may be fixed or variable. 另外,可以选择视图的子集以便随机选择每个视图并且该间隔是不一致的。 Further, the view may be selected so that a randomly selected subset of each view and the interval is inconsistent.

[0025] 重构的图像应用为对计算机36的输入,该计算机36将图像存储在海量存储装置38中。 [0025] The reconstructed image is applied as an input to the computer 36, the computer 36 stores the image in a mass storage device 38.

[0026] 计算机36还经操作者控制台40接收来自操作者的命令和扫描参数,操作者控制台40具有某种形式的操作者接口,例如键盘、鼠标、语音激活的控制器、或任何其他适合的输入设备。 [0026] Computer 36 also operator console 40 receives commands and scanning parameters from an operator via the operator console 40 has some form of operator interface, such as a keyboard, mouse, voice activated controller, or any other suitable input devices. 关联的显示器42允许操作者观察来自计算机36的其他数据和重构的图像。 An associated display 42 allows the operator to observe the reconstructed image and other data from computer 36. 操作者提供的命令和参数可由计算机36用于向DAS32、X-射线控制器28和机架电机控制器30提供控制信号和信息。 The operator supplied commands and parameters are used by computer 36 to DAS32, X- ray controller 28 and gantry motor controller 30 to provide control signals and information. 此外,计算机36操作台电机控制器44,其控制机动化的台46以放置患者22和扫描架12。 In addition, computer 36 operates a table motor controller 44 which controls a motorized table 46 to position patient 22 and gantry 12. 尤其是,台46将患者22整体或部分地移动穿过图1的机架开口48。 In particular, the table 46 or part 22 integrally move the patient through the gantry opening 48 of FIG. 1.

[0027] 在一个实施例中,计算机36包括设备50,例如,软盘驱动器、⑶-ROM驱动器、DVD驱动器、磁光盘(MOD)设备,或包括诸如以太网设备的网络连接设备的任何其他数字设备,用于从计算机可读介质52读取指令和/或数据,所述计算机可读介质52例如软盘、CD-ROM、DVD或例如网络或英特网的另一个数字源,以及要开发的数字装置。 [0027] In one embodiment, computer 36 includes a device 50, for example, a floppy disk drive, ⑶-ROM drive, DVD drive, magnetic optical disk (MOD) device, or included as any other digital device or Ethernet network connection equipment devices for 52 reads from a computer-readable medium of instructions and / or data, the computer readable medium 52 a flexible disk, CD-ROM, DVD or another digital source, for example, a network or the Internet, and digital to develop e.g. device. 在另一个实施例中,计算机36执行存储在固件(未示出)中的指令。 In another embodiment, computer 36 executes a program stored in firmware (not shown) instructions. 在一些配置中,计算机36和/或图像重构器34被编程为执行此处所述的功能。 In some configurations, computer 36 and / or image reconstructor 34 is programmed to perform the functions described herein.

[0028] 图3是根据本发明实施例的针对ROI的SFOV的示意图。 [0028] FIG. 3 is a schematic diagram for the ROI SFOV embodiment of the present invention. 其中,区域ROI例如是动态变化的对象,诸如心脏,或者是静止的对象,诸如膝盖,其是对医学诊断有价值的那部分目标区域。 Among them, for example, the region ROI is the object dynamic, such as the heart, or a stationary object, such as the knees, which is a valuable medical diagnosis that part of the target area. 区域I是区域ROI所在的例如人体的截面。 I is a cross-sectional area of ​​the human body, for example, where the ROI area. 如图3所示,SFOV是以扫描的等中心点(iso center) ISO为中心的圆形区域。 As shown, SFOV isocentre is scanned 3 (iso center) ISO center of the circular area. SFOV的大小由圆形区域的直径决定,这里,SFOVI的直径Dl大于SFOV II的直径D2。 SFOV determined by the size of the diameter of a circular area, where, SFOVI a diameter larger than the diameter Dl to D2 SFOV II. 在常规的扫描方式下,需要以包含区域I的SFOV I进行扫描(此后我们称之为“全局SFOV扫描”),收集属于检测器组装件18的光接受面中SFOV I的投影范围Cl的各通道的X射线检测信号并作为原始数据。 In the conventional scanning method, it is necessary to SFOV comprising scanning region I I (hereinafter we call "Global SFOV Scan"), collector belongs to the detector assembly 18 in the light receiving surface SFOV I Cl projection range of each X-ray detection signal channels as the original data. 而在本发明中,我们提出可以以包含ROI的SFOV II进行扫描(此后我们称之为“局部SFOV扫描”),并且结合补偿扫描的原始数据,重构出与SFOV I对应的DFOV I的图像。 In the present invention, we propose to SFOV II can contain ROI scan (hereinafter we call it "local SFOV scanning"), in conjunction with the original data and the scan-in, a reconstructed image corresponding to the I SFOV DFOV I of . 在局部SFOV扫描中,收集属于检测器组装件18的光接受面中SFOV II的投影范围C2的各通道的X射线检测信号并作为原始数据。 In SFOV partial scan, the light-receiving part of the collection X-ray detection signals for each channel range projection plane C2 of SFOV II and as raw data the detector assembly 18.

[0029] 图4是根据本发明一个实施例的方法的流程图。 [0029] FIG. 4 is a flowchart of the method according to one embodiment of the present invention. 该实施例适用于扫描对象为静态的情况,例如,脑、肺或肝、横膈膜、胸壁、胸腔、肋骨、脊骨、胸骨或骨盆等。 Example adapted to scan the object is static, for example, brain, lung or liver, diaphragm, chest wall, chest, ribs, spine, pelvis sternum or the other embodiment. 下面我们以ROI是肺为例详细说明。 Here we have an example of lung ROI is described in detail. 在本实施例中,需要进行两次独立的完整扫描402和402'。 In the present embodiment, the need for two separate full scan 402 and 402 '. 其中扫描402是针对一个切片中肺的规定剂量局部SFOV扫描;其中扫描402'是针对同一个切片中包含该肺的整个胸腔的全局SFOV扫描,其所用的剂量低于扫描402,例如,仅为扫描402所用剂量的1/6。 Wherein the scanning is predetermined dose topical SFOV 402 for scanning a lung slices; wherein the scanning 402 'is for a global scan of the entire chest SFOV same slice containing the lung, they use doses below 402 scanning, for example, only scan 402 1/6 dose. 由于扫描对象为静态,对于成像速度并不要求,因此优选地,这两次扫描可以分别进行,哪次先哪次后不限,时间间隔也不限,可选地,这两次扫描可以同时进行,这就要求扫描架具有两个X射线源和分别位于其相反侧上的两个检测器组装件,并且注意,两次扫描同时进行并不代表针对同一视角的扫描时同时进行的。 Since the scanned object is static, the imaging speed is not required, therefore preferably, two scans can be carried out separately, which is not limited after which time the first time, the time interval is also limited, alternatively, two scans can be simultaneously performed, which requires the gantry having two X-ray sources and two detectors which are located on the opposite side of the assembly, and note that two scans at the same time do not represent simultaneously performed when scanning for the same angle. 当完成完整的一次扫描之后,即扫描架12旋转了360度后,并分别经过DAS32的处理404和404',得到对应所获得的所有视图的经采样的和数字化的投影数据集,例如对应于局部SFOV的投影数据I或对应于全局SFOV的投影数据I。 Upon the completion of a full scan, i.e., the gantry 12 rotates the post 360, and each processed 404 and 404 DAS 32 'and obtain and digitized sampled all the views corresponding to the obtained projection data set, for example, corresponding to SFOV partial projection data corresponding to the global I or projection data SFOV I. 其后,如果直接对规定剂量局部SFOV扫描得到的投影数据II进行高速重构,则将得到如图6所示的图像,非常不清晰,这不是我们想要的。 Thereafter, if the projection data directly to the predetermined dose topical SFOV scanned II high-speed reconstruction image as shown in FIG. 6 will be obtained, it is not clear, this is not what we want.

[0030] 因此,优选地,接下来,图像重构器接收投影数据I和投影数据I,将它们适当地结合406。 [0030] Thus, preferably, the next image reconstructor receives the projection data and projection data I I, 406 appropriately combining them. 这里,图像重构器包括结合装置和重构装置,优选地,结合装置中设置有缓冲器(未示出),对来自DAS32的投影数据进行缓冲。 Here, the image reconstruction means includes a binding and reconstitution device, preferably, the binding apparatus is provided with a buffer (not shown), the projection data is buffered from the DAS32. 可选地,将所有投影数据存储在海量存储装置38中,需要进行图像重构时调出到结合装置中进行结合。 Alternatively, all the projection data stored in the mass storage device 38, when the need to transfer to an image reconstruction binding apparatus for binding.

[0031] 投影数据结合的方式有两种选择,分别参考图9和图10。 [0031] The projection data to select a combination of two, respectively, with reference to FIGS. 9 and 10. 其中参考图9,其示出了采用完全叠加的投影数据结合的方式。 Wherein 9, which shows a superimposed manner using projection data fully bonded. 图示为单个视图单个切片的投影数据,检测器阵列18的每排检测器20排列成I维阵列状的多通道,每个通道都产生独立的电信号,因此可以用相应的一维数组(维数等于通道数)表示该I维阵列状的多通道的信号,数组中的每一个数按顺序对应每个通道的信号。 Illustrated as a single projection view of a single slice of data, each row of the detector array 20 of detectors 18 are arranged in I-dimensional array of multi-channels, each separate electrical signals are generated, it is possible to use a respective one-dimensional array ( dimension is equal to the number of channels) represents each of the multi-channel signal I-dimensional array, the array signal sequence corresponding to each channel. 对于全局SFOV扫描,全局SFOV对应的投影范围内的对应各通道所对应的数组中的数值是有效的,类似地,可得出局部SFOV扫描后的数组。 For an array of numbers corresponding to the respective channels within the projection range SFOV global scanning, the corresponding global SFOV corresponding is valid, similarly, the array can be obtained after scanning the local SFOV. 图9中以右上至左下的斜线表示全局SFOV扫描后得到的数组中的有效数值,以左上至右下的斜线表示局部SFOV扫描后得到的数组中的有效数值,可以看到,中间部分是全局SFOV扫描和局部SFOV扫描的投影数据的叠加,两边的部分是全局SFOV扫描的投影数据,再外侧是无效数值,因为一般来说投影范围要小于检测器阵列的尺寸。 Figure 9 represents the effective value of the global array SFOV obtained after scanning the upper right to the lower left of the slash, upper left to lower right diagonal effective numerical array represents a partial rear SFOV scanned in can be seen that the intermediate portion the projection data is superimposed SFOV global scan and the local scan SFOV both sides of the projection portion of the scanned data in the global SFOV, then an invalid value is outside, because in general the projection range to be smaller than the size of the detector array. 其中参考图10,其示出了采用部分叠加的投影数据结合的方式。 Wherein 10, which illustrates the embodiment using the projection data superimposed bonded portion. 图示为单个视图单个切片的投影数据,图10中同样以右上至左下的斜线表示全局SFOV扫描后得到的数组中的有效数值,以左上至右下的斜线表示局部SFOV扫描后得到的数组中的有效数值,可以看到,中间部分是局部SFOV扫描的投影数据,两边的部分是全局SFOV扫描的投影数据,再外侧是无效数值。 Illustrated as a single projection view of a single slice data in the same FIG. 10 upper right to lower left diagonal lines represents the effective value of the global array SFOV obtained after the scan to the upper left to the lower right of the slash indicates the scan obtained after partial SFOV effective numerical array can be seen that the intermediate portion is partially SFOV scan projection data, projection data is part of both sides of the global SFOV scanned, then the outside is invalid value. 对于该实施例,优选地采用图9的方式,因为扫描对象为静态,因此对于局部SFOV来说,充分利用每一次扫描,可以获得更高质量的图像。 For this embodiment, preferred embodiment using FIG. 9, since the scanned object is static, so SFOV for topical, the full use of each scan, a higher quality image can be obtained.

[0032] 最后,对结合后的数据按照常规的方式进行高速图像重构408。 [0032] Finally, the binding of data at high speed image reconstruction 408 in a conventional manner. 根据一组投影数据重建图像的一种方法在现有技术中被称为滤波反投影技术。 According to a method a set of projection data is referred to as a reconstructed image filtered backprojection technique in the prior art. 该处理将来自扫描的衰减测量转换为称作“CT数”或“霍斯菲尔德单位”(HU)的整数,该整数被用于控制阴极射线管显示器上对应像素的亮度。 The attenuation measurements from a scan process converts referred to as "the number of CT" or "Hounsfield Units" (HU) of the integer that is used to control the brightness of a corresponding pixel on a cathode ray tube display.

[0033] 通过该实施例,分别以规定剂量进行局部SFOV扫描以及以低于规定剂量的量进行全局SFOV扫描,将投影数据采用部分叠加的方式结合后进行重构可得到的图像如图8所示。 [0033], respectively, a predetermined dose by scanning the local SFOV embodiments and globally lower than a predetermined scanning SFOV dosage, using the projection data is reconstructed image obtained after binding portion of Figure 8 in a superimposed manner shows. 下面我们需要相对于现有技术说明所得到的图像的质量。 Now we need the prior art described with respect to the mass of the resulting image. 根据现有技术,以规定剂量进行全局SFOV扫描,将投影数据进行重构可得到的图像如图7所示。 According to the prior art, a predetermined dose SFOV global scanning, the projection data is reconstructed to obtain an image as shown in FIG. 比较而言,ROI区域的图像质量是相当的,可以预期,如果采用完全叠加的方式结合,根据本发明得到的图像的ROI区域的图像质量甚至将更胜出。 In comparison, the image quality of the ROI are comparable, it is contemplated that, if completely superimposed manner in conjunction with the image quality of the ROI image of the present invention will be obtained even win. 可见,通过该实施例,对非ROI区域进行低剂量的扫描,在降低了辐射对人体的危害风险的同时,保证了ROI区域的图像质量。 Be seen that by this embodiment, the non-ROI area of ​​a low dose scan, reducing the risk of harm to the human body radiation while ensuring the image quality of the ROI.

[0034] 根据该实施例的一个优选的实施方式,对于采用如图10所示的部分叠加的投影数据的结合方式,可以对局部SFOV的投影区的边界的数据进行过渡处理,以使得图像的ROI区域和其它区域之间的边界不那么突兀。 [0034] According to a preferred embodiment of this embodiment, for the use of binding portions as shown in FIG. 10 superimposed projection data can be processing data transition boundary projection area of ​​the local SFOV, so that the image the boundary between the ROI and the other area is not obtrusive. 可以对边界附近的数据应用二阶可导的加权函数进行处理。 Application data may be processed near the boundary of the second order derivable weighting function. 过渡函数的一个例子如下: Examples of a transition function as follows:

[0035] f (X) = 3*x~2_2*x~3 [0035] f (X) = 3 * x ~ 2_2 * x ~ 3

[0036] 其中X代表当前通道和起始过渡通道的距离/过渡通道区域的总长。 [0036] wherein X represents a total length of this channel, and starting from the transition duct / channel region of the transition.

[0037] 则应用到全部通道的投影数据的加权函数如图11所示,其中X代表从左至右依次排列的通道序号,曲线部分对应边界附近的通道,这样: [0037] The weighting function is applied to the projection data of all the channels 11, wherein X represents a channel number in order from left to right, the corresponding channel part of the curve near the boundary, so that:

[0038] 加权处理的投影数据=全局SFOV投影区的投影数据*F(X) +局部SFOV投影区的投影数据* (1-F(X))。 Projection data [0038] = weighted projection data of projection area of ​​global SFOV * F (X) + local SFOV projection data of the projection area * (1-F (X)).

[0039] 图5是根据本发明另一个实施例的方法的流程图。 [0039] FIG. 5 is a flowchart of a method according to another embodiment of the present invention. 该实施例适用于对象为动态的情况,例如心脏。 This embodiment is applicable to the case where dynamic objects, such as the heart. 下面我们以ROI是心脏为例详细说明。 Here we have an example of the heart ROI is described in detail. 在本实施例中,也需要进行局部SFOV扫描402和全局SFOV扫描402'。 In the present embodiment, the need for local and global SFOV SFOV scan 402 scans 402 '. 其中局部SFOV扫描402是针对一个切片中心脏的局部SFOV扫描;其中全局SFOV扫描402'是针对同一个切片中包含该心脏的整个人体横截面的全局SFOV扫描。 Wherein the partial scan 402 is a partial SFOV SFOV for scanning a slice of the heart; wherein the global scanning SFOV 402 'is included for the same slice of the cross section of the heart throughout the body SFOV global scanning. 因为扫描的对象为动态,为了诊断的需要,常常需要扫描多次,例如造影剂增强CT扫描、CT灌注成像、心脏CT血管造影、4D CT等技术。 Because the object is scanned dynamic, required for the diagnosis, often requires multiple scans, for example, contrast-enhanced CT scans, CT perfusion imaging, cardiac CT angiography, 4D CT technology.

[0040] 在该实施例中,我们进行9次局部SFOV扫描402^402^4023......4029和I次全局SFOV扫描402',共10次。 [0040] In this embodiment, we topical SFOV 9 ^ 402 ^ 402 scans 4029 and 4023 ...... I SFOV global scanning times 402 ', a total of 10 times. 由于这些技术对成像速度要求较高,期望在每次完整扫描之后即成像,优选地,首先进行全局SFOV扫描402'。 Due to the high speed requirements of these imaging techniques, i.e., a desired image, preferably, first scanning the overall SFOV 402 after each complete scan '.

[0041] 在一种实施方式下,在每次完整扫描之后即重构图像,针对该种实施方式,优选地,对第一次扫描,即全局SFOV扫描402'以及之后的每次局部SFOV扫描均米用规定剂量,可以保证每次成像的图片质量在可接受的阈值范围之上,以便更好地识别出对象的动态变化。 [0041] In one embodiment, after each complete scan of the image that is reconstructed for this type of embodiment, preferably, for the first scan, each scan after the local SFOV i.e. global scan SFOV 402 'and both with a predetermined dose meters, we can guarantee the quality of each image imaged above the acceptable threshold range, to better identify the moving object changes. 当然,如果对首次扫描后成像的图片质量没有预期,则可选地,对第一次扫描,即全局SFOV扫描402'采用低于规定剂量的剂量,而其后的每次局部SFOV扫描均采用规定剂量。 Of course, if the picture quality is not expected after the first scan imaging, then optionally to the first scanning, i.e., scanning the global SFOV 402 'using doses lower than the prescribed dose, and of each subsequent partial scan are used SFOV the prescribed dose. 当完成完整的全局SFOV扫描402'之后,即扫描架12旋转了360度后,并经过DAS32的处理404',得到对应所获得的所有视图的经采样的和数字化的投影数据集,即投影数据I,之后在图像重构器中以常规的方式对其进行重构,得到图像P:。 Upon completion of the complete global SFOV scan 402 'after, i.e., the gantry 12 rotates the post 360, and processed DAS32 404', obtained and digitized sampled all the views corresponding to the obtained projection data set, i.e., projection data I, then subjected to a conventional manner in the reconstructed image reconstructor obtain the image P :. 同时,优选地,需要在结合装置中设置缓冲器,对来自DAS32的全局SFOV扫描402'得到的投影数据I进行缓存,以便与后续得到的局部SFOV扫描402^402^4023......4029相结合并送至重构装置重构出图像。 Meanwhile, it is preferable to set the buffer in the binding apparatus, projection data from global scanning SFOV DAS32 402 'cached I obtained, to obtain the subsequent partial scan SFOV 402 ^ 402 ^ 4023 ...... 4029 combined and sent to an image reconstruction means for reconstructing.

可选地,将来自DAS32的全局SFOV扫描402'得到的投影数据存储在海量存储装置38中, Alternatively, the global scan DAS32 from SFOV 402 'obtained projection data stored in the mass storage device 38,

在需要与后续得到的局部SFOV扫描402^402^4023......4029相结合时再调出。 In the local need SFOV obtained subsequent scanning 402 ^ 402 ^ 4023 then transferred out when combined ...... 4029. 其后,每次,当完成完整的一次局部SFOV扫描402^4022......4029之后,并分别经过DAS32的处理 Thereafter, every time when complete a full scan after partial SFOV 402 ^ 4022 ...... 4029, and were treated in DAS32

404^4042......或4049,得到对应所获得的所有视图的经采样的和数字化的投影数据集, ...... 404 ^ 4042 or 4049, corresponding to all views to obtain the obtained sampled and digitized projection data set,

例如对应于局部SFOV的投影数据II1或II2......或119。 SFOV for example, corresponding to the local projection data 119 or ...... II1 or II2. 接下来,结合装置接收投影数据 Next, the combining means receiving the projection data

IIpII2......1I9,并将其与投影数据I适当地结合406^4062......4069。 IIpII2 ...... 1I9, and I ^ 406 suitably combined projection data 4062 ...... 4069. 由于扫描的对象是动态的,优选地,结合的方式参考上文中参考图10所描述的方式。 Since the scanning is dynamic objects, preferably, a combination of reference described above with reference to FIG. 10.

[0042] 在另一种实施方式下,在第一次扫描,即全局SFOV扫描402'之后不进行图像重构,而后在每一次进行局部SFOV扫描后立即进行每一次的图像重构。 [0042] In another embodiment, in the first scanning section, i.e., the global scan SFOV 402 'is not performed after image reconstruction, the image reconstruction is then performed each time immediately after each partial scan SFOV. 在该另一种实施方式下,优选地,对第一次扫描,即全局SFOV扫描402'采用低于规定剂量的剂量,而其后的每次局部SFOV扫描均采用规定剂量。 In another embodiment of this embodiment, preferably, for the first scan, i.e. the global scan SFOV 402 'using doses lower than the prescribed dose, and thereafter every partial scanning SFOV predetermined dose are used. 当然,可选地,全局SFOV扫描402'以及之后的每次局部SFOV扫描均可以米用规定剂量。 Scan after each topical SFOV course, alternatively, the global scan SFOV 402 'and m can be with a prescribed dose. 在第一次扫描,即全局SFOV扫描402'之后不进行图像重构,而是仅将其储存起来,优选地,需要在结合装置中设置缓冲器,对来自DAS32的全局SFOV扫描402'得到的投影数据进行缓存,以便与后续得到的局部SFOV扫描402ρ In the first scanning, i.e., scanning the global SFOV 402 'after the image reconstruction is not performed, but only to store it, preferably in a binding buffer needs to be set in the apparatus, the DAS32 from global scanning SFOV 402' obtained projection data cache, in order to scan the subsequent local SFOV obtained 402ρ

4022、4023......4029相结合并重构出图像。 ...... 4022,4023 and 4029 combine reconstructed images. 可选地,将来自DAS32的全局SFOV扫描402' Alternatively, the global scan DAS32 from SFOV 402 '

得到的投影数据存储在海量存储装置38中,在需要与后续得到的局部SFOV扫描402ρ Obtained projection data stored in the mass storage device 38, the local need SFOV obtained subsequent scan 402ρ

4022、4023......4029相结合时再调出。 4022,4023 then transferred out when combined ...... 4029. 其后,每次当完成完整的一次局部SFOV扫描402” Thereafter, every time when complete a full scan 402 of a local SFOV "

4022......4029之后,并分别经过DAS32的处理401304......或4049,得到对应所获得的所有视图的经采样的和数字化的投影数据集,例如对应于局部SFOV的投影数据II1或H2……或Π9。 After 4029 4022 ......, ...... and 401304 are processed or 4049 DAS32 obtain corresponding to all views acquired and digitized sampled projection data set, for example, corresponding to the local SFOV projection data II1 or H2 ...... or Π9. 接下来,结合装置接收投影数据II^ II2……II9,并将其与投影数据I Next, the combining means receiving the projection data II ^ II2 ...... II9, and the projection data which I

适当地结合406^4062......4069。 Appropriate combination 406 ^ 4062 ...... 4069. 由于扫描的对象是动态的,优选地,结合的方式参考上文中参考图10所描述的方式。 Since the scanning is dynamic objects, preferably, a combination of reference described above with reference to FIG. 10.

[0043] 可见,通过该实施例,大大减少了对非ROI区域的扫描,在降低了辐射对人体的危害风险的同时,保证了ROI区域的图像质量。 [0043] visible, through the embodiments, significantly reduce the scanning area of ​​the non-ROI, in reducing the risk of harm to the human body radiation while ensuring the image quality of the ROI.

[0044] 医疗实践中,CT的检查常常分两步进行,即定位扫描和常规扫描。 [0044] In medical practice, CT inspection is often performed in two steps, i.e., positioning and scanning normal scan. 定位扫描又称探测扫描,指以较低的剂量进行的全身的扫描,目的是确定ROI区域的位置。 Also known as scanning probe scanning the positioning, the body means at a lower dosage for a scan in order to determine the position of the ROI. 然后在该位置进行常规扫描。 Then the conventional scanning position.

[0045] 为减少总扫描时间,我们可以采用“螺旋式”扫描进行定位扫描。 [0045] To reduce the total scan time, we can use "helical" scan scout scan. 为进行“螺旋式”扫描,在采集规定数目的切片的数据的同时,移动患者。 For "helical" scan, the acquired predetermined number of data slices, move the patient. 这种系统根据扇形束螺旋式扫描产生单个螺旋。 Such a system generates a single helix The fan beam helical scan. 扇形束所画出的螺旋产生投影数据,根据该投影数据可以重构每个规定切片中的图像。 The fan-beam projection data to generate a spiral drawn can be reconstructed image slices each of predetermined data based on the projection.

[0046] 根据本发明的一种优选的实施方式,可以以低剂量的X射线进行螺旋式定位扫描,得到某些视角的投影数据,然后通过滤波反投影,重构出三维的图像。 [0046] According to a preferred embodiment of the present invention, may be performed in a low-dose X-ray helical scout scan to obtain projection data of some perspective, and by filtering back projection to reconstruct a three-dimensional image. 再根据该三维图像,可以通过正投,得到其它视角方向的投影数据,从而有了各个方向的投影数据。 According to the three-dimensional image and then, by being cast, to give other viewing directions the projection data, so that data with the respective projection directions.

[0047] 这里的“正投”,跟滤波反投影的从视图的投影数据到截面图像的“反投”相对,是从三维的截面图像,根据相应视角方向路径上的像素的积分,获得对应的视角方向上的视图的投影数据的过程。 [0047] Here, "n-cast", with filtered backprojection from the projection data of the view to the cross-sectional image "anti-vote" relative, from cross-sectional images in three dimensions, based on the integration of the pixels on the respective viewing direction path, obtain the corresponding view of the process on the projection data in the viewing direction.

[0048] 后面的步骤,可以参考相对于图4和图5的描述进行。 [0048] The following step, reference may be described with respect to FIGS. 4 and 5 is performed.

[0049] 在本文中,术语“一”或“一个”包括单数各或多于一个的复数个。 [0049] As used herein, the term "a" or "an" include singular or more than one of each plurality. 术语“或”被用于指不排除的或(nonexclusive or),除非另有所指。 The term "or" is used to refer not to an exclusive or (nonexclusive or), unless otherwise indicated. 另外,如本文中所使用的,词语“像素”和“体素”可以互换地使用。 Further, as used herein, the term "pixel" and "voxel" can be used interchangeably. 术语“第一”、“第二”和“第三”等仅被用作标签,并且不意在对其对象施加数值要求或顺序要求。 The terms "first", "second" and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects or request order.

[0050] 还如本文所使用的,词语“重构图像”并不打算排除其中产生表示图像的数据而不产生可视图像的本发明的实施例。 [0050] As further used herein, the phrase "reconstructing an image" is not intended to preclude the data representing an image is generated without generating an embodiment of the present invention, the visible image. 因此,本文中使用的术语“图像”广泛地指可视图像和表示可视图像的数据。 Thus, as used herein, the term "image" broadly refers to visual images and the data visualization image representation. 然而,许多实施例产生(或被配置为产生)至少一个可视图像。 However, many embodiments generate (or are configured to generate) at least one viewable image.

[0051] 本发明的操作环境相对于16层计算X射线断层摄影(CT)系统来描述。 Operating Environment [0051] The present invention will be described with respect to layer 16 calculates the X-ray tomography (CT) system. 然而,本领域技术人员将领会,本发明可同样适用于多层配置的系统,以及适用于在操作期间移动或“抖动”焦点的能力的系统。 However, those skilled in the art will appreciate that the present invention is equally applicable to the configuration of the multilayer system, as well as to move during operation of the system or "dithering" the ability to focus. 而且,本发明将相对于X射线的检测及转换来描述。 Further, the present invention will be with respect to the X-ray detection and conversion will be described. 然而,本领域技术人员将进一步领会到,本发明可同样适用于其他高频电磁能量的检测及转换。 However, those skilled in the art will further appreciate that the present invention is equally applicable to other high frequency electromagnetic energy detection and conversion. 虽然具体实施例参考了第三代CT系统,但是本文所述的方法同样应用于第四代CT系统(例如带有旋转X射线源的静止型检测器)和第五代CT系统(例如静止型检测器和X射线源)。 Although specific embodiments with reference to third generation CT systems, but equally applicable to the methods described herein fourth generation CT systems (stationary detector e.g. with rotating X-ray source) and fifth generation CT systems (e.g., static X-ray source and the detector). 另外,预期本发明的益处可扩展到除CT以外的其他成像模式,例如MR1、SPECT和PET。 Further, the anticipated benefits of the present invention may be extended to other imaging modalities other than CT, e.g. MR1, SPECT and PET.

[0052] 各种实施例或其部件可作为计算机系统的一部分实现。 [0052] member or a part of various embodiments may be implemented as a computer system. 该计算机系统可以包括计算机、输入设备、显示单元和例如用于访问因特网的接口。 The computer system may include a computer, an input device, a display unit and an interface for accessing the Internet, for example. 微处理器可以连接到通信总线。 The microprocessor may be connected to a communication bus. 计算机还可以包括存储器。 The computer may also include a memory. 该存储器可以包括随机存取存储器(RAM)和只读存储器(ROM)。 The memory may include random access memory (RAM) and read only memory (ROM). 该计算机系统还可以包括存储设备,其可以使硬盘驱动器或诸如软盘驱动器、光盘驱动器等的可移动存储设备。 The computer system may further include a storage device, which can be made, such as a hard disk drive or a floppy disk drive, optical disk drive, etc. The removable storage device. 该存储设备还可以使用于装载计算机程序或其他指令到计算机系统中的其他类似的装置。 The storage device may also be other similar means of using a computer system to the loading computer programs or other instructions into.

[0053] 在本发明的各种实施例,创建此处描述的CT衰减矫正图像的方法或其任何部件可以处理机的形式体现。 Method CT [0053] In various embodiments of the present invention, as described herein to create attenuation correction, or any form of image processor components may be embodied. 处理机的典型示例包括通用计算机、编程的微处理器、数字信号处理器(DSP)、微控制器、外围集成电路元件,以及能够实现此处所述方法的步骤的其他设备或设备的布置。 A typical example of a general purpose computer arrangement comprising a processor, a programmed microprocessor, a digital signal processor (DSP), a microcontroller, peripheral integrated circuit element, and other devices or devices capable of implementing the steps of the methods described herein.

[0054] 如本文所使用的,术语“计算机”并不限于在本领域中被称为计算机的那些集成电路,而是可以包括任何基于处理器或基于未处理的系统,包括使用微控制器,精简指令集电路(RISC),专用集成电路(ASIC),逻辑电路和能够执行此处所述功能的任何其他电路或处理器的系统。 [0054] As used herein, the term "computer" is not limited to just those integrated circuits referred to in the art as a computer, but may include any processor-based or untreated system, including systems using microcontrollers, reduced instruction set circuits (RISC), application specific integrated circuit system (ASIC), logic circuits, and any other circuit or processor capable of executing the functions described herein. 上述事例只是示范性的,而且并不打算以任何方式限制术语“计算机”的定义和/或含义。 The above examples are exemplary only, and is not intended in any way to limit the term "computer" definition and / or meaning. 诸如计算机、处理器、微控制器、微型计算机、可编程逻辑控制器、专用集成电路和其他可编程电路之类的这些术语在本文是可互换使用的。 Such as a computer, these terms processors, microcontrollers, microcomputers, programmable logic controllers, application specific integrated circuits, and other programmable circuits or the like are used interchangeably herein.

[0055] 处理机构执行一组指令(例如,对应所述的方法步骤),该指令存储在一个活多个存储元件中(还称作计算机可用介质)。 [0055] The processing means execute a set of instructions (e.g., corresponding to the process step), the plurality of instructions stored in a live storage elements (also termed a computer-usable medium). 存储元件的形式可以为数据库或存在于处理机中的物理存储元件。 The storage element may be a database or a physical memory element present in the processing machine. 存储元件还可以按照需要持有数据或其他信息。 The storage elements may also hold data or other information as desired. 物理存储器可以是,例如但不限于:电子、磁、光、电磁、红外或半导体系统、装置、设备或传播介质。 Physical memory may be, for example, but not limited to: electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, device, or propagation medium. 物理存储器的更具体事例包括但不限于下例:随机存取存储器(RAM)、只读存储器(ROM)、可擦可编程只读存储器(EPR0M或闪存)、硬盘驱动器(HDD)和只读光盘存储器(CDROM)。 More specific examples include, but are not limited physical memory in the following embodiment: a random access memory (RAM), a read only memory (ROM), erasable programmable read-only memory (EPR0M or Flash memory), a hard disk drive (HDD) and CD-ROM memory (CDROM). 上述存储器类型只是示范性的,因此对于可用于存储计算机程序的存储器的类型并不是限制性的。 The above memory types are exemplary only, and therefore may be a memory for storing a computer program of the types are not limiting.

[0056] 所述指令组可以包括各种命令,该命令指示处理机执行特定的操作,例如本发明各种实施例的过程。 The [0056] set of instructions may include various commands that instruct the processing machine to perform specific operations, such as the process of the present invention, various embodiments. 指令组的形式可以是软件程序。 The set of instructions may be in the form of a software program. 软件可以是诸如系统软件或应用软件的各种形式。 The software may be in various forms such as system software or application software. 此外,软件的形式可以是单独程序,在较大程序中的程序模块或一部分程序模块的集合。 Further, the software may be in the form of separate programs, a larger set of program modules, or program part of a program module. 软件还包括以面向对象编程为形式的模块化程序设计。 The software also includes object-oriented programming in the form of modular programming. 由处理机处理输入数据可以是相应于用户的命令,或相应于先前处理的结果,或相应于由另一个处理机做出的请求。 Processing the input data by the processing machine may be a command corresponding to a user, or corresponding to results of previous processing, or corresponding to a request made by another processing machine.

[0057] 本发明的各种实施例,创建图像的方法可由软件、硬件或其组合实现。 Various methods [0057] Example embodiments of the present invention, an image created by software, hardware, or a combination thereof. 例如通过使用标准编程语言(例如C、C++、Java等)可以软件实现由本发明的各种实施例提供的方法。 For example, by using standard programming languages ​​(e.g., C, C ++, Java, etc.) may be provided by the software implementation of various embodiments of the present invention. 如这里使用的,术语“软件”和“固件”可以互换,并且包括存储在存储器中的用于由计算机执行的任何计算机程序性。 As used herein, the terms "software" and "firmware" are interchangeable, and include any computer program stored for execution by a computer of the memory.

[0058] 另外,虽然这里所述的方法是在以计算X射线断层摄影(CT)系统的医学场景中描述的,但是可以预期这些益处还有利于磁共振(MR)系统、超声系统、正电子发射X射线断层摄影(PET)系统、核医疗和其他类型的成像系统。 [0058] Further, although the methods described herein are described in the medical scene to calculate an X-ray tomography (CT) system, but also facilitate these benefits can be expected resonance (MR) system, ultrasound system, a positron the X-ray emission tomography (PET) system, nuclear medicine, and other types of imaging systems. 可以针对特定器官或结构进行操作,这包括生物器官,例如脑、胃、心脏、肺或肝;生物结构,例如横膈膜、胸壁、胸腔、肋骨、脊骨、胸骨或骨盆;肿瘤、或损伤或伤口(sore),例如压迫性骨折。 Can target specific organs or construction operations, including biological organs such as brain, stomach, heart, lung or liver; biological structures, such as the diaphragm, chest wall, chest, ribs, spine, sternum or pelvis; tumor, or injury or wound (sore), for example, compression fracture.

Claims (18)

1.一种用于重构对象图像的计算机X射线断层成像的方法,其特征在于: 通过以第一扫描视野对对象进行第一扫描以获得第一数据; 通过以第二扫描视野对对象进行第二扫描以获得第二数据; 将第一数据与第二数据结合生成结合数据;以及利用结合数据重构出对象图像; 其中第二扫描视野包括在第一扫描视野之内。 1. A method for X-ray computer tomography for reconstructing an object image, characterized by: scanning a first field of view by a first scan of the object to obtain a first data; a second pair of object by scanning the field of view the second scan to obtain a second data; first and second data to generate combined binding data; and the image reconstructed using the combined data of the object; wherein the second field of view comprising scanning in a first scan of the field of view.
2.如权利要求1所述的计算机X射线断层成像的方法,其中第一扫描所采用的第一 X射线剂量低于标准剂量,而第二扫描所采用的第二X射线剂量是标准剂量。 2. The X-ray computer tomography method according to claim 1, wherein the first X-ray dose is less than a first scanning standard dose used, while the second X-ray dose is employed a second scanning standard doses.
3.如权利要求2所述的计算机X射线断层成像的方法,其中第一 X射线剂量为标准剂量的六分之一。 X-ray computer tomography method according to claim 2, wherein the first X-ray dose is one-sixth of the standard dosage.
4.如权利要求1所述的计算机X射线断层成像的方法,其中第二扫描包括多次扫描,每次生成一组第二数据,并与第一数据结合后重构出对象图像。 4. The X-ray computer tomography method according to claim 1, wherein the second scan comprises a plurality of scans, each generating a second data set, and the reconstructed target image data after the first binding.
5.如权利要求1所述的计算机X射线断层成像的方法,其中第一扫描和第二扫描同时进行。 5. The X-ray computer tomography method according to claim 1, wherein the first and second scans are performed simultaneously.
6.如权利要求1所述的计算机X射线断层成像的方法,其中第一扫描先于第二扫描进行。 The method of X-ray computer tomography as claimed in claim 1, wherein the first scan performed prior to the second scan.
7.如权利要求1所述的计算机X射线断层成像的方法,所述结合包括以下两种方式: -将第二数据对应叠加到第一数据中的完全叠加方式; -将第一数据除去与第二数据有效部分对应的部分后的数据与第二数据组合的部分叠加方式; 其中,所述对应是指相同视角、相同的排和相同的通道的对应,并且其中,当扫描对象是静止时,采用完全叠加方式,当扫描对象运动时,采用部分叠加方式。 7. The X-ray computer tomography method according to claim 1, said binding comprising two ways: - superimposing the second data corresponding to the first data is completely superimposed manner; - removal of the first data and portion superimposedly combined data and the second data corresponding to the active portion of a second data portion; wherein the angle of view corresponding to refer to the same, and the same row corresponding to the same channel, and wherein, when the scanning object is a stationary , a fully overlapping manner, when the scanning motion of an object, using some superimposed manner.
8.如权利要求7所述的计算机X射线断层成像的方法,其中当采用部分叠加的结合方式时,对第一数据和第二数据进行过渡处理。 8. The X-ray computer tomography method according to claim 7, wherein when using binding portion superposed manner, the first and second data processing transition.
9.如权利要求1或2所述的计算机X射线断层成像的方法,其中第一扫描为螺旋式定位扫描。 9. The computer tomography X-ray imaging of claim 1 or claim 2, wherein the first scan is a helical scout scan.
10.一种用于重构物理图像的计算机X射线断层成像的系统,其特征在于,包括: 扫描装置,利用X射线通过以第一扫描视野对对象进行第一扫描以获得第一数据,并利用X射线通过以第二扫描视野对对象进行第二扫描以获得第二数据,其中第二扫描视野包括在第一扫描视野之内; 结合装置,用于将第一数据与第二数据结合生成结合数据; 重构装置,利用结合数据重构出对象图像。 10. A computer tomography X-ray system physical reconstructed image, characterized by comprising: scanning means, using X-rays by scanning the first field of view of a first object to a first scan to obtain data, and a second X-ray scanning by the second scanning field of view of the object to obtain a second data, wherein the second field of view comprising scanning in a first scan of the field of view; binding means for binding the first and second data generated binding data; reconstruction means reconstructs the object image using the combined data.
11.如权利要求10所述的计算机X射线断层成像的系统,其中第一扫描所采用的第一X射线剂量低于标准剂量,而第二扫描所采用的第二X射线剂量是标准剂量。 X-ray computer tomography system as claimed in claim 10, wherein a first X-ray dose is less than a first scanning standard dose used, while the second X-ray dose is employed a second scanning standard doses.
12.如权利要求11所述的计算机X射线断层成像的系统,其中第一 X射线剂量为标准剂量的六分之一。 12. The X-ray computer tomography system of claim 11, wherein the first X-ray dose is one-sixth of the standard dosage.
13.如权利要求10所述的计算机X射线断层成像的方法,其中扫描装置进行的第二扫描包括多次扫描,每次生成一组第二数据,结合装置将其与第一数据结合生成结合数据,并被重构装置用来重构出对象图像。 13. The method of X-ray computer tomography according to claim 10, wherein the second scanning means for scanning comprises scanning a plurality of times, each time generating a second set of data, generating a binding means which binds the first binding data data, and reconstruction means to reconstruct an object image.
14.如权利要求10所述的计算机X射线断层成像的系统,其中第一扫描和第二扫描同时进行。 X-ray computer tomography system according to claim 10, wherein the first and second scans are performed simultaneously.
15.如权利要求10所述的计算机X射线断层成像的系统,其中第一扫描先于第二扫描进行。 X-ray computer tomography system of claim 10 to claim 15, wherein the first scan performed prior to the second scan.
16.如权利要求10所述的计算机X射线断层成像的系统,所述结合包括以下两种方式: -将第二数据对应叠加到第一数据中的完全叠加方式; -将第一数据除去与第二数据有效部分对应的部分后的数据与第二数据组合的部分叠加方式; 其中,所述对应是指相同视角、相同的排和相同的通道的对应,并且其中,当扫描对象是静止时,采用完全叠加方式,当扫描对象运动时,采用部分叠加方式。 X-ray computer tomography system of claim 10 to claim 16, wherein the binding includes the following two ways: - superimposing the second data corresponding to the complete superimposition of the first embodiment of the data; - and the first data is removed portion superimposedly combined data and the second data corresponding to the active portion of a second data portion; wherein the angle of view corresponding to refer to the same, and the same row corresponding to the same channel, and wherein, when the scanning object is a stationary , a fully overlapping manner, when the scanning motion of an object, using some superimposed manner.
17.如权利要求16所述的计算机X射线断层成像的系统,其中当采用部分叠加的结合方式时,对第一数据和第二数据进行过渡处理。 X-ray computer tomography system as claimed in claim 16, wherein when using binding portion superposed manner, the first and second data processing transition.
18.如权利要求10或11所述的计算机X射线断层成像的系统,其中第一扫描为螺旋式定位扫描。 X-ray computer tomography system as claimed in claim 11 or claim 10, wherein the first scan is a helical scout scan.
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