WO2019057160A1 - Pet系统探测器环位置调节单元及发射成像设备 - Google Patents

Pet系统探测器环位置调节单元及发射成像设备 Download PDF

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Publication number
WO2019057160A1
WO2019057160A1 PCT/CN2018/106995 CN2018106995W WO2019057160A1 WO 2019057160 A1 WO2019057160 A1 WO 2019057160A1 CN 2018106995 W CN2018106995 W CN 2018106995W WO 2019057160 A1 WO2019057160 A1 WO 2019057160A1
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Prior art keywords
detector ring
ring position
pet system
position adjusting
hole
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PCT/CN2018/106995
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English (en)
French (fr)
Inventor
侍大为
谢思维
许剑锋
翁凤花
黄秋
苏志宏
彭旗宇
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广东影诺数字医学科技有限公司
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Publication of WO2019057160A1 publication Critical patent/WO2019057160A1/zh

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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
    • 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]

Definitions

  • the invention belongs to a component of a medical imaging device, and particularly relates to a PET system detector ring position adjusting unit and an emission imaging device, which can change the position of a positron emission tomography detector ring to adapt to different sizes of the body, thereby Improve the sensitivity of the device.
  • the positron emission tomography (PET) system is a special medical imaging device that can construct an image reflecting the physiological function of the site to be tested according to the specific distribution of the radiotracer in the human or animal body.
  • PET systems include detector rings, data acquisition systems, image reconstruction software, and mechanical components such as hospital beds.
  • the detector ring of the existing PET system is surrounded by a plurality of detectors to form a ring device, and the ring aperture surrounded by the ring device is fixed in size.
  • the ring diameter of the detector ring must be large enough; when it is used to detect small parts of the body, such as the head, it is necessary to reduce its aperture to improve the system. Sensitivity.
  • the existing adjusting device is as shown in FIG. 1 , and comprises a fixed disc 10 and a rotating disc 20 .
  • the fixing disc 10 has N sliding grooves distributed around the center hole in a radial spoke.
  • the surface of the rotating disc 20 has a flat thread groove.
  • the surface of the rotating disc constitutes an Archimedes spiral; the rotating disc 20 is suspended on the bottom surface of the fixed disc by the supporting wheel, and each sliding slot of the fixed disc 10 is provided with a movable member.
  • each movable member Under the rotation of the planar thread groove, each movable member can be along The sliding groove is radially moved; the surface of each sliding groove of the fixed plate 10 is mounted with a connecting plate, which is connected with the corresponding movable member; when working, each connecting plate is equipped with a detector, and the detectors together form a detector ring.
  • the adjusting device of the structure uses a motor to drive the rotation of the rotating disk to drive a circle of the detector to move in the radial direction, thereby changing the aperture of the detector ring.
  • the Archimedes spiral thread groove on the rotary disk 20 is a one-piece type, and has the following problems:
  • Each movable part needs to set different compensation amount in the radial position to ensure that all the detectors form a circle, and the installation adjustment is cumbersome;
  • the radial adjustment amount corresponding to each rotation of the rotating disk is small, and the adjustment efficiency is low;
  • the rotating disc has low strength and is easily deformed or damaged.
  • the present invention provides a PET system detector ring position adjusting unit comprising a fixed disk and a rotating disk.
  • the fixed disk has a central hole and N sliding grooves arranged around the central hole, and each of the sliding slots is connected with a movable member, and each of the movable members is provided with a detector.
  • the rotating disk is arranged along the axial direction of the central hole along the fixed disk, the rotating disk has a central through hole corresponding to the central hole and N radiations disposed around the central through hole a guiding groove of the spokes, the guiding groove being a curved groove on the Archimedes spiral.
  • the movable member is matched with the guiding slot in one-to-one correspondence, and when the rotating disk rotates under the action of the driving member, the movable member moves along the sliding slot under the guidance of the guiding slot to drive The detector thereon.
  • the movable member includes a slider having a section of a "work” type and a roller disposed on the slider, and the sliding slot is provided with a slide rail matched with the slider, the roller The child cooperates with the guiding groove.
  • the driving member and the rotating disk are connected by a transmission mechanism, and the transmission mechanism comprises a gear and a rack fixedly engaged with the gear and disposed on the rotating disk, the rack is An arcuate segment rack disposed concentrically with the rotating disk.
  • the fixing plate is provided with a clamping member for clamping the rotating disk.
  • the clamping member is a bolt
  • the fixing plate is circumferentially spaced apart from the plurality of mounting holes, the bolts are matched with the mounting holes, and the head of the bolt and the fixing plate are matched.
  • a gap is formed between the edges of the rotating disk.
  • the fixed disk is provided with an axial guiding device for moving the fixed disk and the rotating disk in the axial direction of the center hole.
  • the axial guiding means includes an axially disposed guide shaft parallel to the central bore, and a guide through hole provided on the fixed disk, the guide shaft mating with the guide through hole.
  • the fixed disk has a plate-like structure having a rectangular shape.
  • the number of the guide shafts and the guide through holes are all four, and four of the guide shafts are disposed at four vertex angles of the fixed disk.
  • an emission imaging apparatus comprising a plurality of PET system detector ring position adjustment units as described above and a plurality of detectors.
  • a plurality of said PET system detector ring position adjustment units are arranged along the axial spacing of said central bore.
  • a plurality of detectors disposed on the movable member, the plurality of detectors on each of the PET system detector ring position adjusting units collectively forming a detector ring; or, each of the two PET system detectors
  • the plurality of detectors on the ring position adjustment unit together form a detector ring.
  • the PET system detector ring position adjusting unit provided by the invention has the movable section and the curved section groove on the corresponding Archimedes spiral line, so that all the movable parts can be formed into a circle without the compensation amount. It is guaranteed that all the detectors are rounded, and the installation adjustment is convenient and quick; the radial adjustment corresponding to each rotation of the rotary disk is large, the guide groove has a large lead, and the adjustment efficiency is high; and, based on the guide groove on the rotary disk, The split type setting is not only convenient for processing and overhaul, but also has high strength and is not easily deformed and damaged.
  • FIG. 1 is a top plan view of a prior art PET system detector ring position adjustment unit
  • FIG. 2 is a perspective view of a PET system detector ring position adjusting unit (viewed from one side) in accordance with one embodiment of the present invention
  • Figure 3 is a perspective view of the PET system detector ring position adjusting unit shown in Figure 2 as seen from another direction;
  • Figure 4 is a perspective view of the movable member of the PET system detector ring position adjusting unit of Figure 2;
  • FIG. 5 is a perspective view of a transmitting image forming apparatus according to an embodiment of the present invention.
  • the invention provides a PET system detector ring position adjusting unit (hereinafter referred to as a detector ring position adjusting unit) for transmitting an imaging device, and the detector ring position adjusting unit can provide a detector radial position (ie, detecting Ring aperture) adjustable emission imaging device.
  • a detector radial position ie, detecting Ring aperture
  • an emission imaging device in which both the radial position and the axial position are adjustable can also be provided.
  • the emission imaging device may be, for example, a positron emission tomography (PET) device and a single photon emission computer cross-sectional imaging device (SPECT), preferably a positron emission tomography (PET) device.
  • PET positron emission tomography
  • SPECT single photon emission computer cross-sectional imaging device
  • PET positron emission tomography
  • the system can adjust the aperture, or aperture and axial length of the imaging device according to the size of the object to be detected (including human or experimental animals), in order to achieve the best detection
  • the detector ring position adjustment unit 100 includes a fixed disk 110 and a rotating disk 120.
  • the fixed disk 110 has a central hole 111 and N radial grooves 112 arranged around the central hole 111. Each of the sliding slots 112 is connected with a movable member 130, and each movable member 130 is provided with a detector 200.
  • the fixed disk 110 may be made of a metal material such as aluminum, steel, stainless steel, or a plastic material having sufficient strength or the like.
  • the shape of the fixed disk 110 is not limited to the rectangular shape shown in FIGS. 2 to 3, and may be circular, elliptical, triangular, pentagonal, hexagonal, heptagonal, etc., and may even be irregular. The shape is as long as the center hole 111 can be provided on the fixed disk 110 to form a receiving space and satisfy the conditions to be discussed below.
  • the accommodation space will be used to form a receiving chamber that houses the detector and the object to be inspected, as will be described below.
  • the accommodation space may be a cylindrical space, a rectangular parallelepiped (or cube) space, a polygonal prism space, an elliptical cylinder space, or any other shape.
  • the accommodating space can be formed as long as it can be arranged side by side in the axial direction when the plurality of detector ring position adjusting units 100 are arranged side by side (see FIG. 5).
  • the shape of the central hole 111 may be a circular shape, or may be an ellipse, a triangle, a rectangle, a pentagon, a hexagon, a heptagon, or the like, and may even have an irregular shape. Only the center hole 111 is referred to in the drawing.
  • the circular, accommodating space is a cylindrical space to illustrate the principles of the present invention.
  • axial means that the accommodating space is in the fixed disk.
  • the through direction on the 110 such as the direction indicated by the arrow A shown in FIG. 2;
  • radial direction refers to the direction in the axially perpendicular section of the accommodation space that extends through the center of the accommodation space, such as shown in FIG.
  • circumumferential direction means the direction around the accommodation space in the section perpendicular to the axial direction.
  • the rotary disk 120 is disposed along the axial direction of the center hole 111 in parallel with the fixed disk 110.
  • the rotary disk 120 has a central through hole 121 corresponding to the central hole 111 and N guides distributed around the central through hole 121.
  • the groove 122 and the guiding groove 122 are curved groove grooves on the Archimedes spiral line.
  • the rotary disk 120 may be made of a metal material such as aluminum, steel, stainless steel, or a plastic material having sufficient strength or the like.
  • the center of the center through hole 121 and the center of the center hole 111 need to overlap. When the center through hole 121 and the center hole 111 are both circular holes, the radius of the center through hole 121 and the radius of the center hole 111 are preferably equal to each other. The accommodation space.
  • the connection structure between the rotating disk 120 and the fixed disk 110 may be: a clamping member 150 on the fixed disk 110 that uniformly sets the rotating disk 120 along its circumference.
  • the clamping member 150 can be a bolt (of course, it can also be another fastener capable of clamping), and the fixing plate 110 is circumferentially spaced apart from the plurality of mounting holes, and the bolts 150 are matched with the mounting holes one by one, and A gap between the head of the bolt 150 and the fixed disk 110 is reserved for clamping the edge of the rotating disk 120, so that the rotating disk 120 is suspended on the fixed disk 110 by the clamping member 150 so as to be able to be wound around its center under the action of an external force. Rotating motion.
  • the number N of the chutes 112 and the guiding slots 122 can be set according to actual needs, such as 4, 8, 16, etc., but the number of the chutes 112 and the guiding slots 122 are different regardless of the number.
  • the numbers are equal, so that the movable member 130 is matched with the guide groove 122 in one-to-one correspondence.
  • FIG. 4 is a perspective view of the movable member of the PET system detector ring position adjustment unit of Figure 2.
  • the movable member 130 includes a slider 131 having a "work" type in cross section and a roller 132 disposed on the slider 131.
  • the roller 132 can be a commonly used bearing. Referring to Figure 2, the roller 132 cooperates with the guide slot 122. Referring to FIG. 3, in order to facilitate the sliding of the slider 131, the sliding slot 112 is provided with a sliding rail that cooperates with the slider 131.
  • the structure of the movable member 130 shown in FIG. 4 is merely illustrative, and is intended to explain the principle of the present invention.
  • the slider rail of other structural forms can be connected as long as it can be realized. I will not give examples of them.
  • the rotary disk 120 is coupled to the drive member 170.
  • the driving member 170 and the rotating disk 120 are connected by a transmission mechanism 140.
  • the transmission mechanism 140 includes a gear 141 and a rack 142 fixedly coupled to the gear 141 and disposed on the rotating disc 120.
  • the rack 142 is curved in a concentric manner with the rotating disc 120. Segment rack.
  • the rack 142 can be secured to the rotating disk 120 by fasteners such as screws, rivets, bolts, and the like.
  • the detector ring position adjusting unit provided by the present invention has a relatively integral Archimedes spiral groove because each movable member 130 cooperates with a curved segment groove (ie, the guiding groove 122) on the corresponding Archimedes spiral line.
  • it has the following advantages: 1. All the movable members 130 can be formed into a circular shape without the compensation amount, so that all the detectors 200 are circular, and the installation adjustment is convenient and convenient; 2.
  • the rotating disk 120 rotates once. Corresponding radial adjustment amount is large, guide groove 122 has large lead and high adjustment efficiency; 3. convenient processing and maintenance, and in the case of using the same material, the rotating disc strength of the detector ring position adjusting unit provided by the present invention High, not easily deformed and damaged.
  • the fixed disk 110 is provided with an axial guiding device 160.
  • the axial guiding device 160 may include an axially disposed guiding shaft 162 parallel to the central hole 111, and is disposed on the fixed disk 110.
  • the guiding through hole 161, the guiding shaft 162 is engaged with the guiding through hole 161.
  • the guiding through hole 161 is provided with a bearing (such as a linear bearing), and the guiding shaft 162 and the guiding through hole 161 are matched by the bearing.
  • the axial guiding device 160 is configured to move the fixed disk 110 and the rotating disk 120 along the axial direction of the central hole 111.
  • the axial guiding device 160 can also play a certain position to a plurality of detector ring position adjusting units. The effect of positioning along the axial direction of the accommodating space can be seen from Fig. 5.
  • the axial guiding device 160 includes four guiding shafts 162 and four guiding through holes 161 provided at four vertex angles of the fixed disk 110 to The guide probe ring position adjusting unit smoothly slides along the guide shaft 162.
  • the number of the guide shaft and the guide through hole is not limited to 4, and may be 6, 8, 10, or the like.
  • the shape of the fixed disk 110 is circular, elliptical, triangular, pentagonal, hexagonal, heptagonal, etc.
  • the number of the guiding shaft and the guiding through hole may also be 3, 5, 7, etc., as long as it can To the above mentioned effects can be.
  • Fig. 5 is a perspective view showing an emission imaging apparatus according to an embodiment of the present invention.
  • the emission imaging apparatus includes a plurality of detector ring position adjustment units, such as 100 and 100', which may have the same structure or different configurations.
  • the number of detector ring position adjustment units shown in the figures is merely illustrative and is intended to explain the principles of the present invention. In practice, the number of detector ring position adjustment units can be selected according to factors such as the axial size of the detected object and the requirements for detection sensitivity.
  • FIG. 5 is an embodiment in which a plurality of detectors on two detector ring position adjusting units together constitute a detector ring. In practical applications, a plurality of detectors on a detector ring position adjusting unit may also be used. Together form a detector ring.
  • the two detector ring position adjusting units 100 and 100' are disposed facing away, and the plurality of detectors of the two detector ring position adjusting units 100 and 100' together form a detector ring, when it is required to form a receiving cavity having a small aperture
  • the adjustment drive member rotates the rotary disk clockwise to move the detector toward the center hole, thereby forming a receiving cavity having a relatively small aperture.
  • the emission imaging device constructed by the detector ring position adjusting unit provided by the invention can, on the one hand, adjust the at least the radial length of the receiving cavity, so that a detection cavity having a relatively large aperture can be formed as needed, for example, for Adults, or forming a detection cavity with a relatively small aperture, for example for children or small animals, thus obtaining a relatively large stereoscopic space angle compared to existing emission imaging devices, thereby effectively improving the emission imaging device Detection sensitivity; on the other hand, the installation adjustment is convenient and fast, the adjustment efficiency is high, and it is convenient for processing and maintenance.

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Abstract

一种PET系统探测器环位置调节单元及发射成像设备；位置调节单元包括固定盘(110)以及旋转盘(120)；固定盘(110)上具有中心孔(111)及围绕中心孔(111)设置的N个呈辐射状轮辐分布的滑槽(112)，每一滑槽(112)连接有活动件(130)，每一活动件(130)上设置探测器(200)；旋转盘(120)沿着中心孔(111)的轴向与固定盘(110)并排设置，旋转盘(120)上具有与中心孔(111)对应的中心通孔(121)及围绕中心通孔(121)设置的N个呈辐射状轮辐分布的导向槽(122)，导向槽(122)为阿基米德螺旋线上的曲线段槽；活动件(130)与导向槽(122)一一对应配合，旋转盘(120)在驱动件(170)作用下旋转时，活动件(130)在导向槽(122)的引导下沿滑槽(112)径向移动以带动其上的探测器(200)；该位置调节单元安装调节方便快捷，调整效率高，方便加工和检修。

Description

PET系统探测器环位置调节单元及发射成像设备 技术领域
本发明属于医疗成像设备组成部件，具体涉及一种PET系统探测器环位置调节单元及发射成像设备，能够改变正电子发射断层显像检测器环的位置，以适配身体不同大小的部位，从而提高设备的灵敏度。
背景技术
正电子发射断层显像系统(PET)是一种特殊的医疗成像设备，能够根据人体或动物活体内放射性示踪剂的具体分布构建出待测部位反映其生理功能的图像。现有的PET系统包括探测器环、数据采集系统、图像重建软件以及病床等机械部件。
现有PET系统的探测器环由多个探测器环绕构成环形装置，环形装置所环绕的环孔径大小固定不变。对于全身医用的PET系统来说，为了能够适应全身的检测，探测器环的环孔径必须足够大；当用其检测身体较小部位时，如头部，有必要减小其孔径，以提高系统的灵敏度。
因此，需要一种可以改变探测器环孔径大小的调节装置，以适应不同大小的部位。现有的调节装置有如图1所示，包括固定盘10和旋转盘20，固定盘10上围绕中心孔具有N个呈辐射状轮辐分布的滑槽，旋转盘20表面具有平面螺纹槽，其在旋转盘表面构成阿基米德螺旋线；旋转盘20通过支撑轮悬挂在固定盘底面，固定盘10的各滑槽内均装有活动件，在平面螺纹槽旋转作用下，各活动件可以沿滑槽径向移动；固定盘10的各滑槽表面均安装有连接板，其与对应的活动件连接；工作时，各连接板上均安装有探测器，各探测器共同构成探测器环。该种结构的调节装置使用一个电机带动旋转盘的转动就能带动一圈探测器沿径向移动，从而改变探测器环的孔径。但是，旋转盘20上的阿基米德螺旋线式螺纹槽为整体式，存在有以下问题：
1、加工和检修不便；
2、每个活动件在径向位置上都需要设置不同的补偿量，才能确保所有的探测器构成圆形，安装调节繁琐；
3、旋转盘每旋转一度所对应的径向调整量小，调整效率低；
4、旋转盘强度低，易变形或损坏。
发明内容
为了至少部分地解决现有PET系统探测器环位置调节装置存在的问题，本发明提供一种PET系统探测器环位置调节单元，包括固定盘以及旋转盘。所述固定盘上具有中心孔及围绕所述中心孔设置的N个呈辐射状轮辐分布的滑槽，每一所述滑槽连接有活动件，每一所述活动件上设置探测器。所述旋转盘沿着所述中心孔的轴向与所述固定盘并排设置，所述旋转盘上具有与所述中心孔对应的中心通孔及围绕所述中心通孔设置的N个呈辐射状轮辐分布的导向槽，所述导向槽为阿基米德螺旋线上的曲线段槽。其中，所述活动件与所述导向槽一一对应配合，所述旋转盘在驱动件作用下旋转时，所述活动件在所述导向槽的引导下沿所述滑槽径向移动以带动其上的所述探测器。
优选地，所述活动件包括截面呈“工”型的滑块以及设置在所述滑块上的滚子，所述滑槽上设置有与所述滑块相配合的滑轨，所述滚子与所述导向槽配合。
优选地，所述驱动件与所述旋转盘之间通过传动机构连接，所述传动机构包括齿轮以及与所述齿轮相啮合的固定设置在所述旋转盘上的齿条，所述齿条为与所述旋转盘同心设置的弧形段齿条。
优选地，所述固定盘上设置有装夹所述旋转盘的装夹件。
优选地，所述装夹件为螺栓，所述固定盘上环形间隔分布有多个安装孔，所述螺栓与所述安装孔一一对应配合，且所述螺栓的头部与所述固定盘之间预留有装夹所述旋转盘边缘的间隙。
优选地，所述固定盘上设置有轴向引导装置，所述轴向引导装置用于使所述固定盘和所述旋转盘沿着所述中心孔的轴向可移动。
优选地，所述轴向引导装置包括平行所述中心孔的轴向设置的导向轴，以及设置在所述固定盘上的引导通孔，所述导向轴与所述引导通孔配合。
优选地，所述固定盘为具有矩形的板状结构。
优选地，所述导向轴以及所述引导通孔的数量皆为4，且4根所述导向轴设置在所述固定盘的四个顶角处。
根据本发明的另一方面，还提供一种发射成像设备，包括多个如上述的PET系统探测器环位置调节单元以及多个检测器。多个所述PET系统探测器环位置调节单元沿着所述中心孔的轴向间隔布置。多个检测器设置在所述活动件上，每一所述PET系统探测器环位置调节单元上的所述多个探测器共同构成一个探测器环；或，每两个所述PET系统探测器环位置调节单元上的所述多个探测器共同构成一个探测器环。
本发明提供的PET系统探测器环位置调节单元，由于每一活动件与各自对应的阿基米德螺旋线上的曲线段槽配合，不需要补偿量就能使所有的活动件构成圆形进而保证所有的探测器组成圆形，安装调节方便快捷；旋转盘每旋转一度所对应的径向调整量大，导向槽的导程大，调整效率高；还有，基于旋转盘上的导向槽为分体式设置，不仅方便加工和检修，且旋转盘强度高，不易变形和损坏。
在发明内容中引入了一系列简化形式的概念，这将在具体实施方式部分中进一步详细说明。本发明内容部分并不意味着要试图限定出所要求保护的技术方案的关键特征和必要技术特征，更不意味着试图确定所要求保护的技术方案的保护范围。
以下结合附图，详细说明本发明的优点和特征。
附图说明
本发明的下列附图在此作为本发明的一部分用于理解本发明。附图中示出了本发明的实施方式及其描述，用来解释本发明的原理。在附图中，
图1为现有技术的PET系统探测器环位置调节单元的俯视图；
图2为根据本发明一个实施例的PET系统探测器环位置调节单元的立体图(从一方向上看)；
图3为图2中所示的PET系统探测器环位置调节单元从另一方向上看的立体图；
图4为图2中的PET系统探测器环位置调节单元的活动件的立体图；
图5为本发明一实施例的发射成像设备的立体图。
其中，附图标记为
10-固定盘
20-旋转盘
100、100′-PET系统探测器环位置调节单元
110-固定盘
111-中心孔
112-滑槽
120-旋转盘
121-中心通孔
122-导向槽
130-活动件
131-滑块
132-滚子
140-传动机构
141-齿轮
142-齿条
150-装夹件
160-轴向导引装置
161-引导通孔
162-导向轴
170-驱动件
200-探测器
300-容纳腔
具体实施方式
在下文的描述中，提供了大量的细节以便能够彻底地理解本发明。然而，本领域技术人员可以了解，如下描述仅示例性地示出了本发明的优选实施例，本发明可以无需一个或多个这样的细节而得以实施。此外，为了避免与本发明发生混淆，对于本领域公知的一些技术特征未进行详细描述。
传统的发射成像设备一经搭建，其各个方向的尺寸都是固定的。本发明提供一种用于发射成像设备的PET系统探测器环位置调节单元(以下简称探测器环位置调节单元)，采用该探测器环位置调节单元可以提供一种探测器径向位置(即探测器环孔径)可调的发射成像设备。在优选的实施例中，还可以提供径向位置和轴向位置均可调的发射成像设备。所述的发射成像设备例如可以为正电子发射成像(PET)设备和单光子发射计算机断面成像设备(SPECT)，优选地为正电子发射成像(PET)设备。该系统能够根据被检测物体(包括人或者实验动物)体型的大小，调整发射成像设备的孔径、或者孔径和轴向长度，以达到获得最佳检测灵敏度的目的。
图2至图3示出了根据本发明一个优选实施例的探测器环位置调节单元100。探测器环位置调节单元100包括固定盘110和旋转盘120。
固定盘110上具有中心孔111及围绕中心孔111设置的N个呈辐射状轮辐分布的滑槽112，每一滑槽112连接有活动件130，每一活动件130上设置探测器200。固定盘110可以由例如铝、钢、不锈钢的金属材料或具有足够强度的塑料材料等制成。固定盘110的形状不限于图2-图3中所示出的矩形，其还可以为圆形、椭圆形、三角形、五边形、六边形、七边形等，甚至还可以为不规则形状，只要能够在该固定盘110上设置中心孔111以便形成容纳空间并满足以下将要讨论的条件即可。该容纳空间将用于形成容纳检测器和被检测物体的容纳腔，如下文将要描述的。容纳空间可以为圆柱体空间、长方体(或者正方体)空间、多棱柱空间、椭圆柱空间或其他任意形状的空间。该容纳空间只要能够在多个探测器环位置调节单元100沿轴向并排布置时形成上述容纳腔300即可(见图5)。中心孔111的形状可以为圆形，也可以为椭圆形、三角形、矩形、五边形、六边形、七边形等，甚至还可以为不规则形状，附图中仅参照中心孔111为圆形、容纳空间为圆柱形空间的实施例来说明本发明的原理。
需要说明的是，本文所提到的方向术语“轴向”、“径向”和“周向” 都是相对于容纳空间来说的，具体地，“轴向”是指容纳空间在固定盘110上的贯穿方向，例如图2中所示的箭头A指示的方向；“径向”是指容纳空间的与轴向垂直的截面上通过容纳空间的中心延伸的方向，例如图2中所示的箭头R指示的方向；“周向”是指在与轴向垂直的所述截面中围绕容纳空间的方向。
旋转盘120沿着中心孔111的轴向与固定盘110并排设置，旋转盘120上具有与中心孔111对应的中心通孔121及围绕中心通孔121设置的N个呈辐射状轮辐分布的导向槽122，导向槽122为阿基米德螺旋线上的曲线段槽。旋转盘120可以由例如铝、钢、不锈钢的金属材料或具有足够强度的塑料材料等制成。中心通孔121的中心与中心孔111的中心需要重合，在中心通孔121及中心孔111皆为圆形孔时，中心通孔121的半径与中心孔111的半径最好相等，以便形成上述的容纳空间。
旋转盘120与固定盘110之间的连接结构可以为：固定盘110上沿其圆周均匀设置装夹旋转盘120的装夹件150。装夹件150可以为螺栓(当然也可以为别的能起到装夹作用的紧固件)，固定盘110上环形间隔分布有多个安装孔，螺栓150与安装孔一一对应配合，且螺栓150的头部与固定盘110之间预留有装夹旋转盘120边缘的间隙，从而旋转盘120通过装夹件150悬挂在固定盘110上，以便在外力的作用下可以绕其圆心做旋转运动。
滑槽112/导向槽122的个数N可以根据实际需要设定，如可以为4个，8个，16个等等，但不管个数如何，滑槽112的个数与导向槽122的个数相等，以便活动件130与导向槽122一一对应配合。
图4示出了图2中的PET系统探测器环位置调节单元的活动件的立体图。活动件130包括截面呈“工”型的滑块131以及设置在滑块131上的滚子132，滚子132可以采用常用的轴承。结合参阅图2，滚子132与导向槽122配合。结合参阅图3，为了方便滑块131的滑动，滑槽112上设置有与滑块131相配合的滑轨。需要说明的是，图4中示出的活动件130的结构仅为示意性的，其意在解释本发明的原理，别的结构形式的滑块导轨只要能实现滑动连接的皆可，在此就不对其一一举例。
为了驱动旋转盘120旋转，旋转盘120连接有驱动件170。驱动件170与旋转盘120之间通过传动机构140连接。如图2所示，较佳实施例中， 传动机构140包括齿轮141以及与齿轮141相啮合的固定设置在旋转盘120上的齿条142，齿条142为与旋转盘120同心设置的弧形段齿条。齿条142可以通过螺钉、铆钉、螺栓等紧固件固定在旋转盘120上。
基于上述结构设置，旋转盘120在驱动件170作用下旋转时，活动件130在导向槽122的引导下沿滑槽112径向移动以带动其上的探测器200。
本发明提供的探测器环位置调节单元，由于每一活动件130与各自对应的阿基米德螺旋线上的曲线段槽(即导向槽122)配合，相对整体式阿基米德螺旋线槽设置而言，具有如下优点：1、不需要补偿量就能使所有的活动件130构成圆形从而保证所有的探测器200组成圆形，安装调节方便快捷；2、旋转盘120每旋转一度所对应的径向调整量大，导向槽122的导程大，调整效率高；3、方便加工和检修，且在采用相同材质的情况下，本发明提供的探测器环位置调节单元的旋转盘强度高，不易变形和损坏。
结合参阅图2，在优选实施例中，固定盘110上设置有轴向引导装置160，轴向引导装置160可以包括平行中心孔111的轴向设置的导向轴162，以及设置在固定盘110上的引导通孔161，导向轴162与引导通孔161配合，具体来说，引导通孔161内设置有轴承(如直线轴承)，导向轴162与引导通孔161通过轴承相配合。轴向引导装置160用于使固定盘110和旋转盘120沿着中心孔111的轴向可移动，此外，轴向引导装置160还能在一定程度上起到对多个探测器环位置调节单元沿着容纳空间的轴向进行定位的作用，有关此点，从图5中可以看出。
进一步优选地，在固定盘110具有矩形的板状结构的情况下，轴向引导装置160包括四根导向轴162和设置在固定盘110的四个顶角处的四个引导通孔161，以引导探测器环位置调节单元沿着导向轴162平稳地滑动。此处需要说明的是，导向轴与引导通孔的数量并不局限于4，还可以为6、8、10等。当固定盘110的形状为圆形、椭圆形、三角形、五边形、六边形、七边形等时，导向轴与引导通孔的数量还可以为3、5、7等，只要能够起到上述提及的作用即可。
图5示出了本发明一实施例的发射成像设备的立体图。发射成像设备包括多个探测器环位置调节单元，例如100和100′，这些探测器环位置调节单元100和100′可以具有相同的结构或不同的结构。需要说明的是，图中示出的探测器环位置调节单元的数量仅为示意性的，其意在解释本发 明的原理。实际中，探测器环位置调节单元的数量可以根据被检测物体的轴向尺寸以及对检测灵敏度的要求等因素进行选择。附图5中是两个探测器环位置调节单元上的多个探测器共同构成一个探测器环的实施例，在实际应用中，也可以是一个探测器环位置调节单元上的多个探测器共同构成一个探测器环。
现在，以如图5所示的发射成像设备为例，来说明一种优选的发射成像设备的调节方法。两个探测器环位置调节单元100和100′背向设置，且两个探测器环位置调节单元100和100′的多个探测器共同构成一个探测器环，当需要形成孔径较小的容纳腔300时，调整驱动件使旋转盘顺时针旋转，使检测器朝靠近中心孔方向移动，就形成了具有相对较小孔径的容纳腔。
采用本发明提供的探测器环位置调节单元搭建的发射成像设备，一方面，能够使容纳腔的至少径向长度可调，因此可以根据需要来形成具有相对较大孔径的检测腔，例如用于成人，或者形成具有相对较小孔径的检测腔，例如用于儿童或小动物，因此与现有的发射成像设备相比，可以获得相对较大的立体空间角，进而有效地提高发射成像设备的检测灵敏度；另一方面，安装调节方便快捷，调整效率高，方便加工和检修。
本发明已经通过上述实施例进行了说明，但应当理解的是，上述实施例只是用于举例和说明的目的，而非意在将本发明限制于所描述的实施例范围内。此外本领域技术人员可以理解的是，本发明并不局限于上述实施例，根据本发明的教导还可以做出更多种的变型和修改，这些变型和修改均落在本发明所要求保护的范围以内。本发明的保护范围由附属的权利要求书及其等效范围所界定。

Claims (10)

  1. 一种PET系统探测器环位置调节单元，其特征在于，包括：
    固定盘，所述固定盘上具有中心孔及围绕所述中心孔设置的N个呈辐射状轮辐分布的滑槽，每一所述滑槽连接有活动件，每一所述活动件上设置探测器；以及
    沿着所述中心孔的轴向与所述固定盘并排设置的旋转盘，所述旋转盘上具有与所述中心孔对应的中心通孔及围绕所述中心通孔设置的N个呈辐射状轮辐分布的导向槽，所述导向槽为阿基米德螺旋线上的曲线段槽；
    其中，所述活动件与所述导向槽一一对应配合，所述旋转盘在驱动件作用下旋转时，所述活动件在所述导向槽的引导下沿所述滑槽径向移动以带动其上的所述探测器。
  2. 根据权利要求1所述的PET系统探测器环位置调节单元，其特征在于，所述活动件包括截面呈“工”型的滑块以及设置在所述滑块上的滚子，所述滑槽上设置有与所述滑块相配合的滑轨，所述滚子与所述导向槽配合。
  3. 根据权利要求1所述的PET系统探测器环位置调节单元，其特征在于，所述驱动件与所述旋转盘之间通过传动机构连接，所述传动机构包括齿轮以及与所述齿轮相啮合的固定设置在所述旋转盘上的齿条，所述齿条为与所述旋转盘同心设置的弧形段齿条。
  4. 根据权利要求1所述的PET系统探测器环位置调节单元，其特征在于，所述固定盘上设置有装夹所述旋转盘的装夹件。
  5. 根据权利要求4所述的PET系统探测器环位置调节单元，其特征在于，所述装夹件为螺栓，所述固定盘上环形间隔分布有多个安装孔，所述螺栓与所述安装孔一一对应配合，且所述螺栓的头部与所述固定盘之间预留有装夹所述旋转盘边缘的间隙。
  6. 根据权利要求1所述的PET系统探测器环位置调节单元，其特征在于，所述固定盘上设置有轴向引导装置，所述轴向引导装置用于使所述固定盘和所述旋转盘沿着所述中心孔的轴向可移动。
  7. 根据权利要求6所述的PET系统探测器环位置调节单元，其特征在于，所述轴向引导装置包括平行所述中心孔的轴向设置的导向轴，以及设置在所述固定盘上的引导通孔，所述导向轴与所述引导通孔配合。
  8. 根据权利要求7所述的PET系统探测器环位置调节单元，其特征在于，所述固定盘为具有矩形的板状结构。
  9. 根据权利要求8所述的PET系统探测器环位置调节单元，其特征在于，所述导向轴以及所述引导通孔的数量皆为4，且4根所述导向轴设置在所述固定盘的四个顶角处。
  10. 一种发射成像设备，其特征在于，包括：
    多个如权利要求1-9中任一项所述的PET系统探测器环位置调节单元，多个所述PET系统探测器环位置调节单元沿着所述中心孔的轴向间隔布置；以及
    多个检测器，其设置在所述活动件上，每一所述PET系统探测器环位置调节单元上的所述多个探测器共同构成一个探测器环；或，每两个所述PET系统探测器环位置调节单元上的所述多个探测器共同构成一个探测器环。
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