CN112494060A - CT scanning frame inclination angle measuring assembly, measuring method and measuring system - Google Patents

CT scanning frame inclination angle measuring assembly, measuring method and measuring system Download PDF

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CN112494060A
CN112494060A CN202011361439.9A CN202011361439A CN112494060A CN 112494060 A CN112494060 A CN 112494060A CN 202011361439 A CN202011361439 A CN 202011361439A CN 112494060 A CN112494060 A CN 112494060A
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stay wire
scanning frame
inclination angle
encoder
stay
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CN112494060B (en
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丁文峰
刘日平
金帅炯
黄振强
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FMI Technologies Inc
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
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    • A61B6/035—Mechanical aspects of CT
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
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    • G01C9/02—Details

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Abstract

The invention belongs to the technical field of CT, and particularly relates to a CT scanning frame inclination angle measuring assembly, a measuring method and a measuring system. The CT scanning frame is arranged on the support through a bearing, and the stay wire encoder and the stay wire end part thereof are oppositely arranged on the CT scanning frame and the support; the CT scanning frame rotates around the bearing to incline, the stay wire of the stay wire encoder is matched with the wire outlet in a telescopic mode, and the stay wire is always parallel to the radial surface of the bearing. According to the CT scanning frame inclination angle measuring assembly, the length of the stay wire encoder is measured and converted into the inclination angle of the CT scanning frame, so that the influence of an environmental magnetic field is overcome, and the measuring precision is high.

Description

CT scanning frame inclination angle measuring assembly, measuring method and measuring system
Technical Field
The invention belongs to the technical field of CT, and particularly relates to a CT scanning frame inclination angle measuring assembly, a measuring method and a measuring system.
Background
Computed Tomography (CT) utilizes a precisely collimated X-ray beam and a highly sensitive detector to perform cross-sectional scanning one by one around a certain part of a human body, so that a human tissue structure is displayed to a doctor in the form of a picture for the doctor to diagnose.
CT scanners have a gantry that holds an X-ray tube and a detector, and for certain imaging types, such as cervical spine scanning, the gantry is required to be tilted at an angle, and it is important to know the tilt angle of the gantry accurately.
Patent document CN103536304B discloses a CT scanner gantry comprising: a base having a tiltable frame holding a rotating member, the rotating member having an axis of rotation; and drive means for tilting the tiltable frame relative to the base; in addition, a tilt drive control unit is provided for controlling the drive means, and a tilt sensor is provided at the tiltable frame for indicating to the tilt drive control unit the tilt of the tiltable frame with respect to the center of gravity of the earth. Wherein the tilt angle of the tiltable frame with respect to the earth's center of gravity is measured by a tilt sensor, and the measurement accuracy is easily affected by the environmental magnetic field.
Disclosure of Invention
Based on the above-mentioned shortcomings and drawbacks of the prior art, it is an object of the present invention to at least solve one or more of the above-mentioned problems of the prior art, in other words, to provide a CT gantry tilt angle measurement assembly, a CT gantry tilt angle measurement method and a CT gantry tilt angle measurement system which satisfy one or more of the above-mentioned needs.
In order to achieve the purpose, the invention adopts the following technical scheme:
a CT scanning frame inclination angle measuring assembly comprises a support, a CT scanning frame and a stay wire encoder, wherein the CT scanning frame is arranged on the support through a bearing, and the stay wire encoder and the stay wire end part thereof are oppositely arranged on the CT scanning frame and the support; the CT scanning frame rotates around the bearing to incline, the stay wire of the stay wire encoder is matched with the wire outlet in a telescopic mode, and the stay wire is always parallel to the radial surface of the bearing.
Preferably, the number of the stay wire encoders is at least two, and the stay wire encoders are respectively arranged on two sides of the CT scanning frame or the support.
As a preferred scheme, the stay wire encoder is fixedly arranged on the CT scanning frame; when the CT scanning frame is in a zero position, the wire outlet of the stay wire encoder and the radial center of the corresponding bearing are in the same horizontal line, and the end part of the stay wire is installed on the support so that the stay wire is in a vertical state.
As an optimal scheme, the angle amplitude of inclination of the CT scanning frame at the zero position to two sides is 0-30 degrees.
The invention also provides a method for measuring the inclination angle of the CT scanning frame, which is based on the CT scanning frame inclination angle measuring assembly of any scheme, and the measuring method comprises the following steps:
s1, collecting distance L between outlet of stay wire encoder and radial center of bearing corresponding to outlet1The distance L between the radial center of the bearing and the mounting and fixing position of the end part of the stay wire2；
S2, positioning the zero position of the CT scanning frame, and obtaining the stay wire length L of the stay wire encoder corresponding to the zero position0，L0、L1And L2L is obtained for three side lengths of a triangle according to the cosine law0The radian of the opposite angle of (c) is:
Figure BDA0002804079480000021
s3, obtaining the length L of the stay wire encoder when the CT scanning frame inclines to the target position, and judging L and L0The size of (d);
if L is greater than L0Then, the inclination angle of the CT gantry is:
Figure BDA0002804079480000022
if L is less than L0Then, the inclination angle of the CT gantry is:
Figure BDA0002804079480000023
preferably, if there are at least two stayguy encoders, the measuring method further comprises the following steps:
s4, obtaining the inclination angle of the CT scanning frame corresponding to each stay wire encoder through the steps S1-S3, and judging whether the inclination angles of the CT scanning frames corresponding to each stay wire encoder are the same; if so, outputting the inclination angle of the CT scanning frame; if not, outputting an alarm signal of abnormal inclination of the CT scanning frame.
Preferably, the length L of the stay wire corresponding to the zero position0The diagonal angle of (a) is an acute angle.
Preferably, the length L of the stay wire corresponding to the zero position0The diagonal angle of the angle is 45-60 degrees.
The invention also provides a system for measuring the inclination angle of the CT scanning frame, which applies the measuring method of any scheme, and the measuring system comprises:
the zero position positioning module is used for positioning the zero position of the CT scanning frame;
the acquisition module is in signal connection with the zero position positioning module and the stay wire encoder and is used for acquiring the distance L between the wire outlet of the stay wire encoder and the radial center of the corresponding bearing1The distance L between the radial center of the bearing and the mounting and fixing position of the end part of the stay wire2Stay wire length L of stay wire encoder corresponding to zero position of CT scanning frame0And the length L of the stay wire encoder inclined to the target position;
a judging module in signal connection with the acquisition module for judging L and L0The size of (d);
the calculation module is in signal connection with the judgment module and is used for calculating to obtain the inclination angle of the CT scanning frame;
and the display module is in signal connection with the calculation module and is used for displaying the inclination angle of the CT scanning frame.
As a preferred scheme, if there are at least two stay wire encoders, the determining module is further configured to determine whether the tilt angles of the CT scanning frames corresponding to the respective stay wire encoders are the same; if so, the display module displays the inclination angle of the CT scanning frame; if not, the display module displays an alarm signal of abnormal inclination of the CT scanning frame.
Compared with the prior art, the invention has the beneficial effects that:
according to the CT scanning frame inclination angle measuring assembly, the length of the stay wire encoder is measured and converted into the inclination angle of the CT scanning frame, so that the influence of an environmental magnetic field is overcome, and the measuring precision is high.
The method and the system for measuring the inclination angle of the CT scanning frame can quickly and accurately acquire the inclination angle of the CT scanning frame, have simple measurement method and realize intelligent measurement.
Drawings
Fig. 1 is a schematic structural diagram of a CT gantry tilt angle measurement assembly according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a CT gantry tilt angle measurement assembly according to embodiment 1 of the present invention;
FIG. 3 is a schematic structural diagram of a CT gantry tilt angle measurement assembly according to embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of a CT gantry tilt angle measurement system according to embodiment 1 of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the following description will explain the embodiments of the present invention with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example 1:
as shown in fig. 1, the CT scanning frame inclination angle measurement assembly of the present embodiment includes a support 1, a CT scanning frame 2 and a stay wire encoder 3, wherein the support 1 and the CT scanning frame 2 are both inherent structures of a CT machine, that is, the measurement of the inclination angle of the CT scanning frame can be realized only by installing the stay wire encoder, and the structure is simple.
Specifically, the support 1 includes a base and tripods installed on both sides of the base, and the CT scanner 2 is installed on the top of the tripods of the support through a bearing 4, that is, both ends of the bearing 4 are respectively installed on the tripods on both sides of the base, so that the CT scanner has sufficient rotation space and tilt space.
The bracing wire encoder 3 and the end of the bracing wire 30 are respectively arranged on the tripod of the CT scanning frame 2 and the support 1. The CT scanning frame 2 rotates around the bearing 4 to incline, the stay wire of the stay wire encoder 3 is matched with the wire outlet in a telescopic mode, and the stay wire is always parallel to the radial surface of the bearing, so that the length change of the stay wire can be accurately converted into the inclination angle change of the CT scanning frame.
When the CT scanning frame 2 is in the zero position, namely the CT scanning frame is in the vertical direction, the wire outlet of the stay wire encoder 3 and the radial center of the corresponding bearing are in the same horizontal line, and the distance L between the wire outlet of the stay wire encoder and the radial center of the corresponding bearing is equal to the distance L between the wire outlet of the stay wire encoder and the radial center of the corresponding bearing1Not varying with the rotation of the CT gantry, i.e. the distance L1Is fixed; in addition, the end of the stay wire encoder 3 is mounted on the tripod of the support 1 to form a mounting and fixing position 10, so that the stay wire 30 is in a vertical state. Wherein, the distance L between the radial center of the bearing corresponding to the outlet of the stay wire encoder 3 and the mounting fixing position 10 of the stay wire end part2Not varying with the rotation of the CT gantry, i.e. the distance L2Is fixed; by the design, the inclination angle of the CT scanning frame can be accurately converted according to the change of the length of the stay wire encoder 3.
The inclination angles of the front side and the rear side of the CT scanning frame can be set according to actual scanning requirements; for example, the inclination angle amplitude of the front side and the rear side of the CT scanning frame at the zero position is 0-30 degrees, so that most of the requirements of inclined scanning can be met.
The CT scanning frame inclination angle measuring assembly of this embodiment converts the stay wire length of the stay wire encoder into the inclination angle of the CT scanning frame through measurement, overcomes the influence of the environmental magnetic field, and has high measuring accuracy.
In addition, the present embodiment provides a method for measuring an inclination angle of a CT gantry based on the above-mentioned assembly for measuring an inclination angle of a CT gantry, which includes the following steps:
s1, collecting distance L between outlet of stay wire encoder and radial center of bearing corresponding to outlet1The distance L between the radial center of the corresponding bearing and the mounting and fixing position of the end part of the stay wire2；
S2, positioning the zero position of the CT scanning frame, and obtaining the stay wire length L of the stay wire encoder corresponding to the zero position0As shown in FIG. 1, L0、L1And L2L is obtained for three side lengths of a right triangle according to the cosine law0The radian of the opposite angle of (c) is:
Figure BDA0002804079480000051
wherein, the length L of the stay wire corresponding to the zero position0The diagonal angle of (A) is an acute angle, and can be designed according to actual requirements, for example, between 45 and 60 degrees.
S3, when the CT scanning frame rotates and inclines to the target position, the stay wire length L of the stay wire encoder of the CT scanning frame at the target position is obtained, and L are judged0The rotation inclination direction of the CT scanning frame can be obtained;
if L is greater than L as shown in FIG. 20Then the CT scanning frame tilts forward, the stay wire encoder moves from the zero position W1 to the target position W2, and the tilt angle θ of the CT scanning frame is:
with side length of L, L1And L2The formed triangle is obtained according to the cosine theorem:
Figure BDA0002804079480000061
arc degree
Figure BDA0002804079480000062
Arc degree
Figure BDA0002804079480000063
Inclination angle of CT scanning frame
Figure BDA0002804079480000064
If L is less than L as shown in FIG. 30Then the CT scanner is tilted backwardThe stay wire encoder moves to a target position W3 from a zero position W1, and the inclination angle theta of the CT scanning frame is as follows:
with side length of L, L1And L2The formed triangle is obtained according to the cosine theorem:
Figure BDA0002804079480000065
arc degree
Figure BDA0002804079480000066
Arc degree
Figure BDA0002804079480000067
Inclination angle of CT scanning frame
Figure BDA0002804079480000068
Based on the method for measuring the tilt angle of the CT gantry in this embodiment, the present embodiment further provides a system for measuring the tilt angle of the CT gantry, as shown in fig. 4, including:
the zero position positioning module is used for positioning the zero position of the CT scanning frame;
the acquisition module is in signal connection with the zero position positioning module and the stay wire encoder and is used for acquiring the distance L between the wire outlet of the stay wire encoder and the radial center of the corresponding bearing1The distance L between the radial center of the corresponding bearing and the mounting and fixing position of the end part of the stay wire2Stay wire length L of stay wire encoder corresponding to zero position of CT scanning frame0And the length L of the stay wire encoder inclined to the target position;
a judging module in signal connection with the acquisition module for judging L and L0The size of (d); so as to know the rotation and inclination direction of the CT scanning frame;
the calculation module is in signal connection with the judgment module and is used for calculating to obtain the inclination angle of the CT scanning frame;
specifically, the tilt angle of the CT gantry is calculated as follows:
if L is greater than L0Then the CT gantry is tilted forward by an angle of inclination:
Figure BDA0002804079480000071
if L is less than L0Then, the CT gantry tilts backward, and the tilt angle is:
Figure BDA0002804079480000072
and the display module is in signal connection with the calculation module and is used for displaying the inclination angle and the rotation inclination direction of the CT scanning frame.
The method and the system for measuring the inclination angle of the CT scanning frame can quickly and accurately acquire the inclination angle of the CT scanning frame, are simple in measuring method and realize intelligent measurement.
Example 2:
the difference between the CT gantry tilt angle measurement assembly of the present embodiment and embodiment 1 is that:
the number of the stay wire encoders is at least two, for example: two, three, four and the like which are respectively arranged at two sides of the CT scanning frame, namely at least one bearing is respectively arranged at two ends of the bearing, and the specific installation structure can refer to the embodiment 1; by the design, the precision of measuring the inclination angle of the CT scanning frame can be further improved, and the inclination angle of the CT scanning frame subjected to stay wire length conversion by each stay wire encoder can be compared to judge whether the inclination of the CT scanning frame is abnormal or not.
Correspondingly, the method for measuring the inclination angle of the CT gantry of the present embodiment further includes the following steps based on embodiment 1:
s4, obtaining the inclination angle of the CT scanning frame corresponding to each stay wire encoder through the steps S1-S3, and judging whether the inclination angles of the CT scanning frames corresponding to each stay wire encoder are the same; if so, outputting the inclination angle of the CT scanning frame; if not, outputting an alarm signal of abnormal inclination of the CT scanning frame.
Correspondingly, in the system for measuring the inclination angle of the CT scanning frame according to the embodiment, the determining module is further configured to determine whether the inclination angles of the CT scanning frames corresponding to the stay wire encoders are the same; if so, the display module displays the inclination angle of the CT scanning frame; if not, the display module displays an alarm signal of abnormal inclination of the CT scanning frame.
Example 3:
the CT gantry tilt angle measurement assembly of the present embodiment is different from embodiments 1 and 2 in that: the installation position of the stay wire encoder can be adjusted to be installed on the support, and the stay wire end part of the stay wire encoder is installed on the CT scanning frame, so that the measurement of the inclination angle of the CT scanning frame can be realized.
Other structures and corresponding measuring methods and measuring systems can refer to embodiment 1.
Example 4:
the difference between the CT gantry tilt angle measurement assembly of the present embodiment and embodiment 1 is that:
the zero position can be also positioned at any other position, the wire outlet of the stay wire encoder and the radial center of the bearing corresponding to the wire outlet are not limited to be positioned at the same horizontal line, the stay wire is not limited to be positioned at the vertical state, and any other position can be used as the zero position.
Other structures can refer to embodiment 1.
The foregoing has outlined rather broadly the preferred embodiments and principles of the present invention and it will be appreciated that those skilled in the art may devise variations of the present invention that are within the spirit and scope of the appended claims.

Claims (10)

1. A CT scanning frame inclination angle measuring assembly is characterized by comprising a support, a CT scanning frame and a stay wire encoder, wherein the CT scanning frame is arranged on the support through a bearing, and the stay wire encoder and the stay wire end part thereof are oppositely arranged on the CT scanning frame and the support; the CT scanning frame rotates around the bearing to incline, the stay wire of the stay wire encoder is matched with the wire outlet in a telescopic mode, and the stay wire is always parallel to the radial surface of the bearing.
2. The assembly of claim 1, wherein at least two of the pull-string encoders are respectively mounted on two sides of the CT gantry or the support.
3. The assembly of claim 1, wherein the cable encoder is fixedly mounted to the CT gantry; when the CT scanning frame is in a zero position, the wire outlet of the stay wire encoder and the radial center of the corresponding bearing are in the same horizontal line, and the end part of the stay wire is installed on the support so that the stay wire is in a vertical state.
4. The assembly of claim 3, wherein the CT gantry in the zero position is tilted to both sides by an angle of 0-30 °.
5. A method for measuring the inclination angle of a CT scanning frame, which is based on the assembly for measuring the inclination angle of the CT scanning frame as claimed in any one of claims 1 to 4, and is characterized in that the method comprises the following steps:
s1, collecting distance L between outlet of stay wire encoder and radial center of bearing corresponding to outlet1The distance L between the radial center of the bearing and the mounting and fixing position of the end part of the stay wire2；
S2, positioning the zero position of the CT scanning frame, and obtaining the stay wire length L of the stay wire encoder corresponding to the zero position0，L0、L1And L2L is obtained for three side lengths of a triangle according to the cosine law0The radian of the opposite angle of (c) is:
Figure FDA0002804079470000011
s3, obtaining the length L of the stay wire encoder when the CT scanning frame inclines to the target position, and judging L and L0The size of (d);
if L is greater than L0Then, the inclination angle of the CT gantry is:
Figure FDA0002804079470000012
if L is less than L0Then, the inclination angle of the CT gantry is:
Figure FDA0002804079470000021
6. the method of claim 5, wherein if there are at least two pull-wire encoders, the method further comprises the following steps:
s4, obtaining the inclination angle of the CT scanning frame corresponding to each stay wire encoder through the steps S1-S3, and judging whether the inclination angles of the CT scanning frames corresponding to each stay wire encoder are the same; if so, outputting the inclination angle of the CT scanning frame; if not, outputting an alarm signal of abnormal inclination of the CT scanning frame.
7. The method of claim 5 or 6, wherein the length L of the stay corresponding to the zero position is the length L of the stay0The diagonal angle of (a) is an acute angle.
8. The method of claim 7, wherein the length L of the stay corresponding to the zero position is the same as the length L of the stay corresponding to the zero position0The diagonal angle of the angle is 45-60 degrees.
9. A CT gantry tilt angle measurement system, applying the measurement method according to any one of claims 5 to 8, wherein the measurement system comprises:
the zero position positioning module is used for positioning the zero position of the CT scanning frame;
an acquisition module connected with the zero position positioning module,The stay wire encoder is in signal connection and is used for acquiring the distance L between the wire outlet of the stay wire encoder and the corresponding radial center of the bearing1The distance L between the radial center of the bearing and the mounting and fixing position of the end part of the stay wire2Stay wire length L of stay wire encoder corresponding to zero position of CT scanning frame0And the length L of the stay wire encoder inclined to the target position;
a judging module in signal connection with the acquisition module for judging L and L0The size of (d);
the calculation module is in signal connection with the judgment module and is used for calculating to obtain the inclination angle of the CT scanning frame;
and the display module is in signal connection with the calculation module and is used for displaying the inclination angle of the CT scanning frame.
10. The system of claim 9, wherein if there are at least two pull-cord encoders, the determining module is further configured to determine whether the tilt angles of the CT gantry corresponding to the pull-cord encoders are the same; if so, the display module displays the inclination angle of the CT scanning frame; if not, the display module displays an alarm signal of abnormal inclination of the CT scanning frame.
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CN116839510A (en) * 2023-07-21 2023-10-03 北京斯年智驾科技有限公司 Angle measuring device and method, electronic equipment and storage medium

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CN103536304A (en) * 2012-07-12 2014-01-29 滑动环及设备制造有限公司 Monitoring device for a CT scanner gantry
CN205898112U (en) * 2016-08-04 2017-01-18 长沙中联恒通机械有限公司 Cantilever crane angle detecting means
US20170281117A1 (en) * 2016-03-29 2017-10-05 NeuroLogica Corporation, a subsidiary of Samsung Electronics Co., Ltd. Correction for drive, tilt and scanning speed errors in imaging systems

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Publication number Priority date Publication date Assignee Title
US6580777B1 (en) * 1999-01-05 2003-06-17 Hitachi Medical Corporation X-ray CT apparatus
CN102721392A (en) * 2011-12-14 2012-10-10 中国人民解放军总参谋部第六十研究所 Pull-wire type angle measurement system
CN103536304A (en) * 2012-07-12 2014-01-29 滑动环及设备制造有限公司 Monitoring device for a CT scanner gantry
US20170281117A1 (en) * 2016-03-29 2017-10-05 NeuroLogica Corporation, a subsidiary of Samsung Electronics Co., Ltd. Correction for drive, tilt and scanning speed errors in imaging systems
CN205898112U (en) * 2016-08-04 2017-01-18 长沙中联恒通机械有限公司 Cantilever crane angle detecting means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116839510A (en) * 2023-07-21 2023-10-03 北京斯年智驾科技有限公司 Angle measuring device and method, electronic equipment and storage medium

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