WO2024067530A1 - 一种具有管电流调制功能的静态ct成像设备及其成像方法 - Google Patents

一种具有管电流调制功能的静态ct成像设备及其成像方法 Download PDF

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WO2024067530A1
WO2024067530A1 PCT/CN2023/121283 CN2023121283W WO2024067530A1 WO 2024067530 A1 WO2024067530 A1 WO 2024067530A1 CN 2023121283 W CN2023121283 W CN 2023121283W WO 2024067530 A1 WO2024067530 A1 WO 2024067530A1
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tube current
degree
ray source
static
ring
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PCT/CN2023/121283
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French (fr)
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崔志立
李运祥
高建
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北京纳米维景科技有限公司
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/40—Arrangements for generating radiation specially adapted for radiation diagnosis
    • A61B6/4007—Arrangements for generating radiation specially adapted for radiation diagnosis characterised by using a plurality of source units
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4266—Arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a plurality of detector units
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/42—Arrangements for detecting radiation specially adapted for radiation diagnosis
    • A61B6/4275—Arrangements for detecting radiation specially adapted for radiation diagnosis using a detector unit almost surrounding the patient, e.g. more than 180°
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/54—Control of apparatus or devices for radiation diagnosis
    • A61B6/542—Control of apparatus or devices for radiation diagnosis involving control of exposure

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  • the invention relates to a static CT imaging device with a tube current modulation function, and also relates to a corresponding static CT imaging method, belonging to the technical field of medical devices.
  • CT Computer Tomography
  • X-ray beams and highly sensitive X-ray detectors to perform layer-by-layer section scanning around a certain part of the human body
  • the scintillation material on the X-ray detector receives the X-rays that pass through the layer, converts them into visible light, and then converts them into electrical signals by the photoelectric converter. After amplification, they are converted into digital signals through analog/digital conversion and input into the computer for processing.
  • the information obtained from the layer-by-layer section scanning is calculated to obtain the X-ray attenuation coefficient or absorption coefficient of each voxel, and then arranged into a matrix, namely the voxel digital matrix.
  • the digital information in the voxel digital matrix is converted into small squares with varying grayscales from black to white, which are called pixels on a two-dimensional projection. Arranged in a tomographic manner to form a CT image.
  • the static real-time CT imaging system includes an annular photon counting detector, an annular scanning X-ray source and a scanning timing controller. Among them, under the control of the scanning timing controller, the annular scanning X-ray source emits a narrow beam of X-rays, which penetrate the object to be measured and project onto the corresponding annular photon counting detector.
  • the annular photon counting detector sends the corresponding exposure information to the data acquisition processing unit and the human-computer interaction unit through the scanning host and the main control unit, and completes the image reconstruction in the data acquisition processing unit and the human-computer interaction unit.
  • the annular scanning X-ray source does not need to rotate significantly, and the X-ray projection position is switched in sequence through electronic control, so that the scanning speed is increased by dozens of times, and a dynamic three-dimensional stereo image can be obtained: the photon counting detector is used to obtain absorption data and energy data, and thus achieve real-time data reconstruction.
  • the primary technical problem to be solved by the present invention is to provide a static CT imaging device with a tube current modulation function.
  • Another technical problem to be solved by the present invention is to provide a corresponding static CT imaging method.
  • a static CT imaging device with a tube current modulation function comprising a ray source ring and a detector ring:
  • the ray source ring is provided with a plurality of evenly distributed ray sources, each of which is used to emit rays to scan the human body to be measured, and project the positioning image of the human body at different angles onto the detector ring;
  • the detector ring is provided with a plurality of evenly distributed detectors to collect the rays to obtain the positioning image;
  • tube current modulation information of the radiation source corresponding to the corresponding projection position according to the projection brightness of the positioning image wherein the tube current modulation information includes the value of the tube current that each radiation source on the radiation source ring should use during medical examination;
  • the tube currents of the corresponding ray sources on the ray source ring are adjusted.
  • the 0-degree tube current that should be used by the 0-degree position ray source on the ray source ring during medical examination is obtained;
  • the thickness of the human body and the coverage of the human body in the X-Y direction by the positioning image are judged according to the bed height, and the 90-degree tube current that should be used by the 90-degree position ray source on the ray source ring during medical examination is obtained;
  • the 180-degree tube current is obtained according to the 0-degree tube current
  • the 270-degree tube current is obtained according to the 90-degree tube current
  • An interpolation method is used to interpolate the 0-degree tube current, the 90-degree tube current, the 180-degree tube current and the 270-degree tube current to obtain the tube current that should be used by the radiation source at each position on the radiation source ring during medical examination.
  • each of the ray sources emits rays alternately at a set frequency, and the projection areas corresponding to each of the ray sources do not overlap.
  • the static CT imaging device also includes an image processing device, which is connected to the detector ring and is used to receive the positioning image and perform image processing on the positioning image.
  • the interpolation method adopts a linear interpolation method or an elliptical interpolation method.
  • a static CT imaging method is provided, which is implemented based on the above-mentioned static CT imaging device and includes the following steps:
  • Each ray source on the ray source ring emits rays to scan the human body to be measured, and projects the positioning image of the human body at different angles onto the detector ring, and the detectors on the detector ring obtain the positioning image;
  • tube current modulation information of the radiation source corresponding to the corresponding projection position according to the projection brightness of the positioning image wherein the tube current modulation information includes the value of the tube current that each radiation source on the radiation source ring should use during medical examination;
  • the tube currents of the corresponding ray sources on the ray source ring are adjusted.
  • the 0-degree tube current that should be used by the 0-degree position ray source on the ray source ring during medical examination is obtained;
  • the thickness of the human body and the coverage of the human body in the X-Y direction by the positioning image are judged according to the bed height, and the 90-degree tube current that should be used by the 90-degree position ray source on the ray source ring during medical examination is obtained;
  • the 180-degree tube current is obtained according to the 0-degree tube current
  • the 270-degree tube current is obtained according to the 90-degree tube current
  • the 0-degree tube current, 90-degree tube current, 180-degree tube current and 270-degree tube current are interpolated by an interpolation method to obtain the tube currents that should be used by the radiation sources at various positions on the radiation source ring during medical examinations.
  • the value of the tube current is associated with the thickness of the human body.
  • the static CT imaging device with tube current modulation function configureds the tube current of the radiation source corresponding to the projection angle to a value associated with the thickness of the human body according to the different situations of the radiation passing through the thickness of the human body at different projection angles, thereby realizing automatic modulation of the tube current and effectively reducing the radiation dose to the human body.
  • FIG1 is a schematic diagram of the overall structure of a static CT imaging device with a tube current modulation function in one embodiment of the present invention
  • FIG2 is a schematic diagram of the distribution of radiation sources in a static CT imaging device in one embodiment of the present invention.
  • FIG3 is a schematic diagram of tube current corresponding to a projection angle in one embodiment of the present invention.
  • FIG. 4 is a flow chart of a static CT imaging method with tube current modulation function in one embodiment of the present invention.
  • static CT imaging equipment has multiple ray sources evenly distributed in a ring, so the idea of realizing automatic modulation technology of tube current is completely different from that of spiral CT equipment.
  • Static CT imaging equipment does not need to adjust the tube current of a single ray source in real time, but only needs to calculate the tube current of the ray source at a specific projection angle according to the relationship between the tube current and the projection angle and configure it accordingly.
  • the pre-calculated tube current modulation schemes for each angle position are configured to the ray source at the corresponding angle position, and the static CT imaging equipment can scan according to the configured tube current modulation scheme.
  • the unique characteristics of the ray source ring and detector ring of static CT imaging equipment can be combined to realize a unique tube current automatic modulation function, that is, according to the different situations of X-rays passing through the human body thickness at different projection angles, the tube current of the ray source corresponding to the projection angle is configured to a value associated with the human body thickness, thereby realizing "tube current automatic modulation", which can effectively reduce the radiation dose to the human body.
  • the intensity of X-rays is usually expressed in milliamperes (mA) of tube current.
  • mA milliamperes
  • the brightness of the projected image (such as the scout image) can be controlled.
  • the 0 degree position mentioned in the embodiment of the present invention refers to the position directly above the ray source ring and/or the detector ring, and the corresponding angular position is calculated in the counterclockwise direction.
  • the embodiment of the present invention first provides a static CT imaging device with a tube current modulation function.
  • the core idea of the static CT imaging device is to utilize the characteristics of the ray source ring and the detector ring unique to the static CT imaging device, calculate the value of the tube current required by the ray source at a specific projection angle according to the relationship between the tube current and the projection angle, and configure it. Before scanning, the pre-calculated tube current modulation schemes for each angle position are configured to the ray source at the corresponding angle position, and then scan according to the configured tube current value.
  • a static CT imaging device with a tube current modulation function includes a ray source ring and a detector ring.
  • the ray source ring is provided with multiple evenly distributed ray sources, each of which is used to emit rays to scan a human body to be tested, and project positioning images of the human body at different angles onto the detector ring;
  • the detector ring is provided with multiple evenly distributed detectors, which are used to collect the rays to obtain the positioning images;
  • the tube current modulation information of the ray source corresponding to the corresponding projection position is obtained according to the projection brightness of the positioning image, and the tube current modulation information includes the value of the tube current that each of the ray sources on the ray source ring should use during medical examination; according to the tube current modulation information, the tube current of the corresponding ray source on the ray source ring is adjusted.
  • the radiation source is preferably an X-ray source, and may also be other types of radiation sources.
  • a 0-degree position radiation source is used to scan and obtain a positioning image of the human body, and a 0-degree tube current mA-0 that should be used by the 0-degree position radiation source on the radiation source ring during medical examination is obtained according to the projection brightness of the positioning image;
  • the thickness of the human body and the coverage of the human body in the X-Y direction by the positioning image are judged, and the 90-degree tube current mA-90 that should be used by the 90-degree position ray source on the ray source ring during medical examination is obtained;
  • the 180-degree tube current mA-180 is obtained according to the 0-degree tube current, and the value of mA-180 is equal to the value of mA-0; the 270-degree tube current mA-270 is obtained according to the 90-degree tube current, and the value of mA-270 is equal to the value of mA-90.
  • the tube currents at different projection angles are axially symmetrical and symmetrical at the center of the circle.
  • the tube current corresponding to the projection angle can be interpolated between the 0-degree tube current, the 90-degree tube current, the 180-degree tube current and the 270-degree tube current. Interpolation is performed to obtain the tube current that should be used by the radiation source at each angular position on the radiation source ring during medical examination.
  • the human body can be simulated as an ellipse, with 0 degrees and 90 degrees corresponding to the minor axis and major axis of the ellipse respectively. That is, the path of the ray passing through the ellipse under different projection angles can be calculated, thereby obtaining the tube current mA-X (X represents the angle) of the ray source corresponding to each projection angle.
  • each radiation source at different projection angles of the radiation source ring performs medical examinations with different tube currents.
  • a plurality of ray sources may be evenly arranged on the ray source ring.
  • Each ray source emits rays alternately at a set frequency, and the alternating frequency of emitting rays needs to ensure that the projection areas corresponding to each ray source do not overlap to avoid interference.
  • the static CT imaging device may further include an image processing device.
  • the image processing device is connected to the detector ring and is used to receive the scout image and perform image processing on the scout image.
  • an embodiment of the present invention further provides a static CT imaging method with a tube current modulation function, which specifically includes steps S1 to S3:
  • Each ray source on the ray source ring emits rays to scan the human body to be measured, and projects the positioning image of the human body at different angles onto the detector ring, and the detectors on the detector ring obtain the positioning image;
  • a 0-degree position radiation source is used to scan and obtain a positioning image of a human body, and according to the projection brightness of the positioning image, a 0-degree tube current mA-0 that should be used by the 0-degree position radiation source on the radiation source ring during medical examination is obtained;
  • the thickness of the human body and the coverage of the human body in the XY direction of the positioning image are determined.
  • the 180-degree tube current mA-180 is obtained according to the 0-degree tube current, and the value of mA-180 is equal to the value of mA-0; the 270-degree tube current mA-270 is obtained according to the 90-degree tube current, and the value of mA-270 is equal to the value of mA-90. That is, considering the inherent symmetry of the human body, with mA-0, mA-90, mA-180 and mA-270 as four endpoints, the tube currents at different projection angles are axially symmetrical and symmetrical at the center of the circle.
  • the interpolation method can use a linear interpolation method or an elliptical interpolation method.
  • the value of the tube current is associated with the thickness of the human body
  • the value of the tube current associated with the thickness of the human body is configured to the corresponding radiation source on the radiation source ring.
  • the static CT imaging device with tube current modulation function and the imaging method thereof provided by the present invention can configure the tube current of the radiation source corresponding to the projection angle to a value associated with the thickness of the human body according to the different conditions of the radiation passing through the human body at different projection angles, thereby realizing automatic modulation of the tube current and effectively reducing the radiation dose to the human body.

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Abstract

一种具有管电流调制功能的静态CT成像设备及其成像方法。静态CT成像设备包括射线源环和探测器环；射线源环上设置有均匀分布的多个射线源，各射线源用于发射射线扫描待测的人体，并将人体在不同角度位置的定位像投影到探测器环上；探测器环上设置有均匀分布的多个探测器，用于采集射线以获得定位像；根据定位像的投影亮度获得相应的投影位置所对应的射线源的管电流调制信息，管电流调制信息包括射线源环上的各射线源在医疗检查时应使用的管电流的数值；根据管电流调制信息，调整射线源环上相应的射线源的管电流。利用具有管电流调制功能的静态CT成像设备及其成像方法，可以实现管电流的自动调制，有效降低对人体的辐照剂量。

Description

一种具有管电流调制功能的静态CT成像设备及其成像方法 技术领域
本发明涉及一种具有管电流调制功能的静态CT成像设备，同时也涉及相应的静态CT成像方法，属于医疗器械技术领域。
背景技术
CT(Computed Tomography)是计算机断层扫描技术的简称。它的成像原理是这样的：利用X射线束与灵敏度极高的X射线探测器围绕人体的某一部位进行逐层的断面扫描，由X射线探测器上的闪烁材料接收透过该层面的X射线，转变为可见光后，由光电转换器转变为电信号，放大后再经模拟/数字转换转为数字信号，输入计算机进行处理。在计算机中，逐层断面扫描所得到的信息经计算后，获得每个体素的X射线衰减系数或吸收系数，再排列成矩阵，即体素数字矩阵。将体素数字矩阵中的数字信息转为由黑到白不等灰度的小方块，在二维投影上称为像素，按照断层方式排列即构成CT图像。
为了提高扫描速度，提升成像精度和速度，并避免机械旋转所带来的离心力的影响，降低高速旋转时信号拖尾效应及重叠串扰程度，在公告号为CN105361900B的中国发明专利中，公开了一种静态实时CT成像系统。该静态实时CT成像系统包括环形光子计数探测器、环形扫描X射线源和扫描时序控制器。其中，在扫描时序控制器的控制下，环形扫描X射线源发射窄束X射线，透过被测物体后投照到对应的环形光子计数探测器上。环形光子计数探测器将相应的曝光信息通过扫描主机和主控制单元送入数据采集处理单元及人机交互单元，在数据采集处理单元及人机交互单元中完成图像重建。上述静态实时CT成像系统在扫描过程中，环形扫描X射线源不需要大幅度旋转，通过电子控制依次切换X射线投照位置，使扫描速度提高数十倍，可以获得动态三维立体图像：采用光子计数探测器，可以获得吸收数据和能量数据，并由此实现实时数据重建。
但是，在CT设备进行医疗检查的过程中，为了降低对人体的伤害，需要控制辐射剂量。对于大多数螺旋CT设备而言，由于仅有一个射线源， 最极端的情况时(胸部扫描)，一圈的扫描需要进行管电流的两个周期的调节，如果每秒扫描4圈，则管电流的调节频率约8Hz。对于热阴极射线源而言，管电流的大小受环境温度和灯丝温度影像很大，实现管电流调制的技术难度很大。
发明内容
本发明所要解决的首要技术问题在于提供一种具有管电流调制功能的静态CT成像设备。
本发明所要解决的另一技术问题在于提供一种相应的静态CT成像方法。
为了实现上述目的，本发明采用下述的技术方案：
根据本发明实施例的第一方面，提供一种具有管电流调制功能的静态CT成像设备，包括射线源环和探测器环：
所述射线源环上设置有均匀分布的多个射线源，各所述射线源用于发射射线扫描待测的人体，并将所述人体在不同角度位置的定位像投影到所述探测器环上；所述探测器环上设置有均匀分布的多个探测器，用于采集所述射线以获得所述定位像；
根据所述定位像的投影亮度获得相应的投影位置所对应的所述射线源的管电流调制信息，所述管电流调制信息包括所述射线源环上的各所述射线源在医疗检查时应使用的管电流的数值；
根据所述管电流调制信息，调整所述射线源环上相应的射线源的管电流。
其中较优地，根据所述定位像的投影亮度，获得所述射线源环上的0度位置射线源在医疗检查时应使用的0度管电流；
根据床位高度判断人体厚度及定位像在X-Y方向上人体的覆盖范围，获得所述射线源环上的90度位置射线源在医疗检查时应使用的90度管电流；
依据对称性原理，根据所述0度管电流获得180度管电流，根据所述90度管电流获得270度管电流；
采用插值方法对所述0度管电流、90度管电流、180度管电流和270度管电流之间进行插值，获得所述射线源环上各个位置的射线源在医疗检查时应使用的管电流。
其中较优地,各所述射线源按照设定频率交替发射射线，并且各所述射线源分别对应的投影区域不重叠。
进一步地，所述静态CT成像设备还包括图像处理装置，所述图像处理装置与所述探测器环连接，所述图像处理装置用于接收所述定位像并对所述定位像进行图像处理。
其中较优地，所述插值方法采用线性插值方法或椭圆插值方法。
根据本发明实施例的第二方面，提供一种静态CT成像方法，基于上述的静态CT成像设备实现，包括以下步骤：
射线源环上的各个射线源发射射线扫描待测的人体，并将所述人体在不同角度位置的定位像投影到探测器环上，所述探测器环上的探测器获得所述定位像；
根据所述定位像的投影亮度获得相应的投影位置所对应的所述射线源的管电流调制信息，所述管电流调制信息包括所述射线源环上的各所述射线源在医疗检查时应使用的管电流的数值；
根据所述管电流调制信息，调整所述射线源环上相应的射线源的管电流。
其中较优地，根据所述定位像的投影亮度，获得所述射线源环上的0度位置射线源在医疗检查时应使用的0度管电流；
根据床位高度判断人体厚度及定位像在X-Y方向上人体的覆盖范围，获得所述射线源环上的90度位置射线源在医疗检查时应使用的90度管电流；
依据对称性原理，根据所述0度管电流获得180度管电流，根据所述90度管电流获得270度管电流；
采用插值方法对所述0度管电流、90度管电流、180度管电流和270度管电流进行插值，获得所述射线源环上各个位置的射线源在医疗检查时应使用的管电流。
其中较优地，所述管电流的数值与所述人体厚度相关联。
与现有技术相比较，本发明提供的具有管电流调制功能的静态CT成像设备根据不同投影角度下，射线穿过人体厚度的不同情况，将对应投影角度的射线源的管电流配置为与人体厚度相关联的数值，从而实现管电流的自动调制，有效降低对人体的辐照剂量。
附图说明
图1为本发明的一个实施例中，具有管电流调制功能的静态CT成像设备的整体结构示意图；
图2为本发明的一个实施例中，静态CT成像设备中的射线源分布示意图；
图3为本发明的一个实施例中，对应于投影角度的管电流示意图；
图4为本发明的一个实施例中，具有管电流调制功能的静态CT成像方法的流程图。
具体实施方式
下面结合附图和具体实施例对本发明的技术内容进行详细具体的说明。
在CT设备进行医疗检查的过程中，管电流的自动调制是实现辐射剂量控制的关键技术之一，即根据定位像自动调节扫描时采用的管电流的数值。对于现有的螺旋CT设备而言，由于仅有一个射线源，实现管电流调制的技术难度很大。
如图1所示，静态CT成像设备具备整环均匀分布的多个射线源，因此实现管电流的自动调制技术的思路与螺旋CT设备是完全不同的，静态CT成像设备不需要实时调整单个射线源的管电流，只需要按照管电流与投影角度的关系计算出特定投影角度下的射线源的管电流并进行相应的配置。在扫描前，将预先计算好的各个角度位置的管电流调制方案配置到对应角度位置的射线源上，静态CT成像设备就可以按照该配置好的管电流调制方案进行扫描。
因此，可以结合静态CT成像设备独有的射线源环和探测器环的特点，实现独特的管电流自动调制功能，即根据不同投影角度下X射线穿过人体厚度的不同情况，将对应投影角度的射线源的管电流配置为与人体厚度相关联的数值，从而实现“管电流自动调制”，可以有效降低对人体的辐照剂量。
需要说明的是，在本领域中通常用管电流的毫安数(mA)表示X射线的强度。通过控制管电流的数值，可以控制投影图像(如定位像)的亮度。另外，本发明实施例中所说的0度位置是指射线源环和/或探测器环的正上方位置，相应的角度位置依照逆时针方向计算。
本发明实施例首先提供一种具有管电流调制功能的静态CT成像设备。该静态CT成像设备的核心思路是利用静态CT成像设备独有的射线源环和探测器环的特点，按照管电流与投影角度的关系计算出特定投影角度下射线源所需的管电流的数值并进行配置。在扫描前，将预先计算好的各个角度位置的管电流调制方案配置到对应角度位置的射线源上，然后按照此配置好的管电流的数值进行扫描。
下面，结合图2和图3所示的实施例对该具有管电流调制功能的静态CT成像设备的具体实施方式进行详细说明。
如图2所示，具有管电流调制功能的静态CT成像设备包括射线源环和探测器环。射线源环上设置有均匀分布的多个射线源，各射线源用于发射射线扫描待测的人体，并将所述人体在不同角度位置的定位像投影到所述探测器环上；探测器环上设置有均匀分布的多个探测器，用于采集所述射线以获得所述定位像；根据所述定位像的投影亮度获得相应的投影位置所对应的所述射线源的管电流调制信息，所述管电流调制信息包括所述射线源环上的各所述射线源在医疗检查时应使用的管电流的数值；根据所述管电流调制信息，调整所述射线源环上相应的射线源的管电流。
在本发明的一个实施例中，射线源优选为X射线源，也可以是其他类型的射线源。使用0度位置射线源扫描获得人体的定位像，根据定位像的投影亮度获得射线源环上的0度位置射线源在医疗检查时应使用的0度管电流mA-0；
根据床位高度判断人体厚度及定位像在X-Y方向上人体的覆盖范围，获得所述射线源环上的90度位置射线源在医疗检查时应使用的90度管电流mA-90；
依据人体的对称性原理，根据所述0度管电流获得180度管电流mA-180，mA-180的数值等于mA-0的数值；根据所述90度管电流获得270度管电流mA-270，mA-270的数值等于mA-90的数值。具体地说，考虑到人体固有的对称性，以mA-0、mA-90、mA-180和mA-270为四个端点，不同的投影角度的管电流呈轴对称且圆心对称。
因此，如图3所示的对应于投影角度的管电流，可以采用插值方法对0度管电流、90度管电流、180度管电流和270度管电流之间进 行插值，获得所述射线源环上各个角度位置上的射线源在医疗检查时应使用的管电流。
除了采用上述线性插值方式外，也可以使用其他的插值方式，比如：将人体模拟成一个椭圆，0度和90度分别对应椭圆的短轴和长轴，即可以算出不同投影角度下射线经过该椭圆的路径，从而获得各个投影角度对应的射线源的管电流mA-X(X表示角度)。
完成不同投影角度射线源的管电流配置后，启动正常扫描流程。位于射线源环的不同投影角度上的各个射线源分别以不同的管电流进行医学检查工作。
在本发明的一个实施例中，射线源环上可以均匀设置多个射线源(例如4个、6个或者8个等)。各个射线源按照设定频率交替发射射线，发射射线的交替频率需保证各个射线源分别对应的投影区域不重叠，以避免产生干涉。
在本发明的一个实施例中，该静态CT成像设备还可以包括图像处理装置。该图像处理装置与探测器环连接，用于接收所述定位像并对所述定位像进行图像处理。
在上述静态CT成像设备的基础上，如图4所示，本发明实施例还提供一种具有管电流调制功能的静态CT成像方法，具体包括步骤S1～S3：
S1：射线源环上的各个射线源发射射线扫描待测的人体，并将所述人体在不同角度位置的定位像投影到探测器环上，所述探测器环上的探测器获得所述定位像；
S2：根据人体的定位像的投影亮度获得对应于所述投影位置的所述射线源的管电流，所述管电流调制信息包括所述射线源环上的各所述射线源在医疗检查时应使用的管电流的数值；
S3：根据所述管电流调制信息，调整所述射线源环上相应的射线源的管电流。
具体地，使用0度位置射线源扫描获得人体的定位像，根据所述定位像的投影亮度，获得所述射线源环上的0度位置射线源在医疗检查时应使用的0度管电流mA-0；
根据床位高度判断人体厚度及定位像X-Y方向上人体的覆盖范围， 获得所述射线源环上的90度位置射线源在医疗检查时应使用的90度管电流mA-90；
依据人体的对称性原理，根据所述0度管电流获得180度管电流mA-180，mA-180的数值等于mA-0的数值；根据所述90度管电流获得270度管电流mA-270，mA-270的数值等于mA-90的数值。即，考虑到人体固有的对称性，以mA-0、mA-90、mA-180和mA-270为四个端点，不同的投影角度的管电流呈轴对称且圆心对称。
因此，采用插值方法对0度管电流、90度管电流、180度管电流和270度管电流之间进行插值，可以获得射线源环上各个角度位置上的射线源在医疗检查时应该使用的管电流的数值。在本发明的不同实施例中，所述插值方法可以采用线性插值方法或椭圆插值方法。
由于管电流的数值与人体厚度相关联，将与人体厚度相关联的管电流的数值配置到射线源环上相应的射线源中。在完成不同投影角度射线源的管电流配置后，启动正常扫描流程。位于射线源环的不同投影角度上的各个射线源分别以不同的管电流进行医学检查工作。
与现有技术相比较，本发明提供的具有管电流调制功能的静态CT成像设备及其成像方法，能够根据不同投影角度下射线穿过人体厚度不同的情况，将对应投影角度的射线源的管电流配置为与人体厚度相关联的数值，从而实现对管电流的自动调制，有效降低对人体的辐照剂量。
上面对本发明提供的具有管电流调制功能的静态CT成像设备及其成像方法进行了详细的说明。对本领域的一般技术人员而言，在不背离本发明实质内容的前提下对它所做的任何显而易见的改动，都将构成对本发明专利权的侵犯，将承担相应的法律责任。

Claims (10)

  1. 一种具有管电流调制功能的静态CT成像设备，其特征在于包括射线源环和探测器环；
    所述射线源环上设置有均匀分布的多个射线源，各所述射线源用于发射射线扫描待测的人体，并将所述人体在不同角度位置的定位像投影到所述探测器环上；所述探测器环上设置有均匀分布的多个探测器，用于采集所述射线以获得所述定位像；
    根据所述定位像的投影亮度获得相应的投影位置所对应的所述射线源的管电流调制信息，所述管电流调制信息包括所述射线源环上的各所述射线源在医疗检查时应使用的管电流的数值；
    根据所述管电流调制信息，调整所述射线源环上相应的射线源的管电流。
  2. 如权利要求1所述的具有管电流调制功能的静态CT成像设备，其特征在于：
    根据所述定位像的投影亮度，获得所述射线源环上的0度位置射线源在医疗检查时应使用的0度管电流；
    根据床位高度判断人体厚度及所述定位像在X-Y方向上人体的覆盖范围，获得所述射线源环上的90度位置射线源在医疗检查时应使用的90度管电流；
    依据对称性原理，根据所述0度管电流获得180度管电流，根据所述90度管电流获得270度管电流。
  3. 如权利要求2所述的具有管电流调制功能的静态CT成像设备，其特征在于：
    采用插值方法对所述0度管电流、90度管电流、180度管电流和270度管电流之间进行插值，获得所述射线源环上各个位置的射线源在医疗检查时应使用的管电流。
  4. 如权利要求3所述的具有管电流调制功能的静态CT成像设备，其特征在于：
    所述插值方法采用线性插值方法或椭圆插值方法。
  5. 如权利要求1所述的具有管电流调制功能的静态CT成像设备， 其特征在于：
    各所述射线源按照设定频率交替发射射线，并且各所述射线源分别对应的投影区域不重叠。
  6. 如权利要求1所述的具有管电流调制功能的静态CT成像设备，其特征在于还包括图像处理装置，所述图像处理装置与所述探测器环连接，所述图像处理装置用于接收所述定位像并对所述定位像进行图像处理。
  7. 一种静态CT成像方法，基于权利要求1～6中任意一项所述的静态CT成像设备实现，其特征在于包括以下步骤：
    射线源环上的各个射线源发射射线扫描待测的人体，并将所述人体在不同角度位置的定位像投影到探测器环上，所述探测器环上的探测器获得所述定位像；
    根据所述定位像的投影亮度获得相应的投影位置所对应的所述射线源的管电流调制信息，所述管电流调制信息包括所述射线源环上的各所述射线源在医疗检查时应使用的管电流的数值；
    根据所述管电流调制信息，调整所述射线源环上相应的射线源的管电流。
  8. 如权利要求7所述的静态CT成像方法，其特征在于：
    根据所述定位像的投影亮度，获得所述射线源环上的0度位置射线源在医疗检查时应使用的0度管电流；
    根据床位高度判断人体厚度及定位像在X-Y方向上人体的覆盖范围，获得所述射线源环上的90度位置射线源在医疗检查时应使用的90度管电流；
    依据对称性原理，根据所述0度管电流获得180度管电流，根据所述90度管电流获得270度管电流；
    采用插值方法对所述0度管电流，90度管电流，180度管电流和270度管电流进行插值，获得所述射线源环上各个角度位置上的射线源在医疗检查时应使用的管电流。
  9. 如权利要求8所述的静态CT成像方法，其特征在于：
    所述插值方法采用线性插值方法或椭圆插值方法。
  10. 如权利要求7～9中任意一项所述的静态CT成像方法，其特 征在于：
    所述管电流的数值与所述人体厚度相关联。
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