CN113558652A - Method and system for automatically acquiring acceleration and deceleration distance of CT (computed tomography) bed - Google Patents

Method and system for automatically acquiring acceleration and deceleration distance of CT (computed tomography) bed Download PDF

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CN113558652A
CN113558652A CN202110886227.0A CN202110886227A CN113558652A CN 113558652 A CN113558652 A CN 113558652A CN 202110886227 A CN202110886227 A CN 202110886227A CN 113558652 A CN113558652 A CN 113558652A
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bed
speed
acceleration
distance
deceleration
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金帅炯
丁文峰
黄振强
蒋浩杰
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Minfound Medical Systems Co Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/04—Positioning of patients; Tiltable beds or the like
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
    • A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computerised tomographs
    • A61B6/032—Transmission computed tomography [CT]

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Abstract

The invention relates to the field of CT beds, in particular to a method and a system for automatically acquiring the acceleration and deceleration distance of a CT bed. The method comprises the following steps: the CT bed receives the opening instruction, starts to operate and returns to the initial position of the zero point; starting accelerated motion after the CT bed returns to the initial position, and recording the position information when the CT bed starts to move as L1(ii) a When the speed of the CT bed reaches the preset speed, the position information of the CT bed at the moment is counted as L2(ii) a The CT bed receives the stop command, starts the deceleration movement and records the information of the CT bed at the moment as L3(ii) a The CT bed is completely still, and the position information when the CT bed stops is recorded as L4(ii) a Respectively calculating acceleration distance | L1‑L2L and deceleration distance L3‑L4L, |; repeating the steps to obtain the acceleration distance and the deceleration distance of the CT bed with different preset speeds; respectively generating addition and subtraction according to acceleration distance and deceleration distance obtained by different preset speedsAnd (4) running the CT bed according to each generated acceleration and deceleration distance curve respectively. The problem of how to measure the maximum scanning length of the CT bed is solved.

Description

Method and system for automatically acquiring acceleration and deceleration distance of CT (computed tomography) bed
Technical Field
The invention relates to the field of CT beds, in particular to a method and a system for automatically acquiring the acceleration and deceleration distance of a CT bed.
Background
A CT bed is one of the most commonly used conventional examination devices in clinical medicine, and has been widely used in many clinical medicine fields such as disease detection, angiography, cardiac imaging, interventional therapy, and the like.
The function of the scanning bed of the medical CT equipment is not only to send a patient to the aperture of the scanning frame, but also to correctly fix the detected part of the detected patient on the X-exposure position. In the process, the system has strict requirements on the stability of the CT bed motion subsystem, because if the CT bed motion subsystem is unstable, the comfort of the patient during scanning detection is influenced, and more importantly, the unstable motion of the CT bed easily causes inaccurate positioning of a scanning part or causes violation of image in a scanning image, thereby influencing the scanning quality and increasing the misdiagnosis probability.
Therefore, during the X-ray exposure, the CT bed needs to move at a constant speed, and the quality of the image is affected by acceleration or deceleration. In practical situations, the mechanical stroke of the CT table is limited, so it is necessary to find the optimal point of the X-ray exposure of the CT table, and to increase the scan length as much as possible while ensuring the image quality. In practice, if the acceleration distance or deceleration distance is increased, the scanning length is reduced, and if the distance of the CT bed is not enough, the scanning will fail. However, in the machining and assembling process, errors often exist in each bed, so that the acceleration distance and the deceleration distance of each bed are different, and therefore, the actual effective scanning length of each CT bed is not equal, but at present, the CT bed is in an ideal state, the CT bed is calculated by an acceleration formula v/2/a, a certain margin is added on the basis, the actual situation is not considered, and the scanning length is shortened in order to ensure the image quality.
In summary, the technical problem actually solved by the present invention is how to measure the maximum scan length of different CT beds.
Disclosure of Invention
In order to overcome the above technical defects, an object of the present invention is to provide a method for automatically acquiring an acceleration/deceleration distance of a CT table. The maximum scanning length of different CT beds is measured.
The invention discloses a method for automatically acquiring the acceleration and deceleration distance of a CT (computed tomography) bed, which comprises the following steps of:
the CT bed receives the opening instruction, starts to operate and returns to the initial position of the zero point;
starting to accelerate the CT bed towards the direction of the machine tool after the CT bed returns to the initial position, and recording the position information when the CT bed starts to move as L1；
The CT bed receives the stop command, starts the deceleration movement and records the information of the CT bed at the moment as L3；
When the CT bed is completely still and does not perform deceleration movement any more, the position information of the CT bed when the CT bed stops is recorded as L4；
Respectively calculating an acceleration distance and a deceleration distance, wherein the acceleration distance is calculated by an equation of | L1-L2The deceleration distance is calculated as L3-L4|；
Repeating the steps to obtain the acceleration distance and the deceleration distance of the CT bed with different preset speeds;
and respectively generating acceleration and deceleration distance curves according to the acceleration distance and the deceleration distance obtained at different preset speeds, and respectively operating the CT bed according to each generated acceleration and deceleration distance curve.
Preferably, the first preset speed is 50mm/s and when repeated thereafter, each preset speed value is increased by 25mm/s on the previous basis.
Preferably, the preset speed is less than or equal to 200 mm/s.
Preferably, after the speed of the CT bed reaches the preset speed, the CT bed starts to move at a constant speed according to the preset speed until a stop command is pressed.
Preferably, the distance of uniform movement of the CT bed is | L2-L3|。
Preferably, when the CT bed does not move at a constant speed after the CT bed reaches the preset speed, an error reporting instruction occurs, and the CT bed returns to the zero initial position and repeats the current preset speed to perform the accelerated motion.
In view of the above, another object of the present invention is to provide a system for acquiring an acceleration/deceleration distance of a CT table, comprising: : the system comprises an intelligent terminal, a control module and a recording module; wherein the content of the first and second substances,
the control module for controlling the CT bed to be started and stopped and the recording module for recording the position information of the CT bed at each time are arranged in an intelligent terminal, and the intelligent terminal is connected with the CT bed;
a speed threshold value is set in the recording module, after the control module forms a starting instruction, the CT bed starts to move in an accelerated manner until the moving speed of the CT bed is equal to the speed threshold value, and the recording module respectively records the position information of the CT bed when the CT bed starts to move in an accelerated manner and counts the position information as L1And position information when the moving speed is equal to the speed threshold and is counted as L2；
After the control module forms a stop instruction, the CT bed starts to perform deceleration movement until the CT bed completely stops, and the recording module respectively records the position information of the CT bed when the CT bed starts to perform deceleration movement and counts the position information as L3And the position information when the CT bed is completely stopped and is counted as L4；
Performing reciprocating movement by using different acceleration thresholds to obtain acceleration distances and deceleration distances when the acceleration thresholds are different;
the recording module respectively calculates the acceleration distance and the deceleration distance obtained by different acceleration thresholds and respectively generates an acceleration and deceleration distance curve.
Preferably, the intelligent terminal controls each acceleration and deceleration distance curve generated by the respective operation of the CT bed.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
1.; the maximum effective scanning lengths of different CT beds can be detected respectively;
2.; only one detection is needed for the same CT bed;
3.; the CT imaging quality is improved, and the misdiagnosis probability is reduced.
Drawings
FIG. 1; the invention is a flow diagram of a method for automatically obtaining the acceleration and deceleration distance of a CT bed;
FIG. 2; is a flow chart of the system for obtaining the acceleration and deceleration distance of the CT bed.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.
Referring to fig. 1, the present embodiment provides a method for automatically obtaining an acceleration/deceleration distance of a CT bed, including the following steps that when the CT bed receives a start command, the CT bed starts to move, and if the current position of the CT bed is not at the initial position of the zero point, the CT bed returns to the initial position of the zero point from the current position; starting to move along the direction of the CT machine tool after the CT bed returns to the initial position of the zero point in an accelerated motion mode, recording the position information of the CT bed when the CT bed starts to move at the initial position, and recording the time when the CT bed moves from the initial position at the moment as L1(ii) a When the CT bed starts to move with acceleration and reaches a preset speed value, the CT bed is an effective position which can be subjected to X-ray exposure shooting, the position information of the CT bed when the moving speed of the CT bed reaches the preset speed value is recorded, and the position information of the CT bed at the moment is counted as L2(ii) a CT bed at L2Starting to move at a constant speed according to a preset speed value after the position; when the CT bed receives the stop instruction, the CT starts to carry out deceleration from the state of moving at a constant speedMoving and recording the position information of the CT bed at the moment when the CT bed starts to decelerate from the state of uniform movement as L3(ii) a When the CT bed continuously decelerates from the state of deceleration movement until the CT bed is completely static, the CT bed completes a cycle, and the position information of the CT bed when completely static is recorded as L4(ii) a After the position information of the CT bed at four positions is obtained, the four position information is used for calculating the acceleration distance and the deceleration distance, and the acceleration distance calculation formula is | L1-L2The deceleration distance is calculated as L3-L4L, |; at this point, a stroke of a preset speed is completed.
Then, detecting the acceleration distance and the deceleration distance of the CT bed by referring to different preset speeds; after the CT bed is detected according to different preset speeds, an acceleration and deceleration distance curve is respectively generated according to the extreme distance and the deceleration distance of the CT bed obtained according to the different preset speeds, and then the CT bed is respectively operated according to each generated acceleration and deceleration distance curve.
It should be noted that, in the above method, the acceleration distance and the deceleration distance of the CT bed are respectively subtracted from the motion stroke of the whole CT bed to obtain a motion distance for performing the uniform motion, and the subtracted acceleration distance and deceleration distance of the CT bed are minimum values, because the distance from the time when the CT bed starts the acceleration motion to the time when the CT bed just reaches the preset speed is subtracted, and the distance from the time when the CT bed starts the deceleration motion to the time when the CT bed is completely stationary is subtracted, and no margin is reserved, the obtained distance for the uniform motion is the maximum effective scanning length.
The value of the first detection of the preset speed is 50mm/s, namely when the CT bed moves from the acceleration and the speed of the CT bed completely reaches 50mm/s, the CT bed starts to move at a constant speed. In the subsequent repeated detection process, the preset speed is higher than the previous speed every time, and the higher value is 25mm/s, namely the first time is 50mm/s, the second time is 75mm/s, and the third time is 100mm/s, so that the moving speed is increased for detection. The upper line of the preset speed is 200mm/s, namely when the preset speed is detected in an incremental mode of 25mm/s, the next repetition will not be carried out when the preset speed is detected to be 200mm/s, and therefore the preset speed is more than or equal to 50mm/s and less than or equal to 200 mm/s.
When the CT bed reaches the preset speed, the CT bed starts to move at a constant speed. Namely, if the set preset speed is 50mm/s, when the CT bed moves from the zero initial position in an acceleration mode, the movement is 0mm/s, when the CT bed gradually performs acceleration movement and the movement speed is 50mm/s, the CT bed continuously moves according to 50mm/s of the preset speed, knowing that the CT bed receives a stop command, when the stop command is received, the CT bed performs deceleration movement from the movement speed of 50mm/s, and the movement speed of the CT bed gradually decreases until the movement speed of the CT bed becomes 0mm/s, and at the moment, the CT bed stops moving.
And the uniform moving distance is | L2-L3I.e. the distance from the position information when the moving speed of the CT bed reaches the value of the preset speed to the position information when the CT bed starts to move in a deceleration way is the distance of the maximum effective scanning length of the CT bed.
If the CT bed does not move at a constant speed after the speed of the CT bed reaches the preset speed, an error instruction occurs at the moment, and the CT bed starts to return to a zero position after receiving the error instruction to repeat the current preset speed to carry out acceleration motion detection. That is, if the preset speed is 50mm/s, the CT bed starts the acceleration motion from the initial position, and when it is known that the preset speed reaches 50mm/s, and the latter end should be continuously at the moving speed of 50mm/s, but the actual moving speed of the CT bed does not move according to the speed of 50mm/s of the preset speed value, or the CT bed moves at the moving speed of 50mm/s or less than 50mm/s, an error command will occur at this time, and the CT bed is controlled to return to the zero position, and the CT bed is accelerated according to the new speed value of 50 mm/s.
If the preset speed of the CT bed reaches the preset speed, and when the CT bed moves at a constant speed after reaching the preset speed, when the CT bed receives a stop instruction and does not perform deceleration movement, an error instruction occurs at the moment. When the preset speed is 50mm/s, the CT bed moves at a constant speed according to the moving speed of 50mm/s, when the CT bed receives a stop instruction and does not perform deceleration movement, namely the CT bed still moves at the moving speed of 50mm/s, at the moment, an error is reported, the CT bed stops current movement, and returns to the initial position to repeat the current preset speed.
If the moving speed of the CT bed does not reach the value of the preset speed when the CT bed moves from the initial position to the maximum stroke of the CT machine tool in the process of moving the CT bed on the CT machine tool, an error command is generated at the moment, the CT bed returns to the zero position, and the current value of the preset speed is repeated to carry out accelerated motion.
Referring to fig. 2, the present embodiment provides a system for acquiring an acceleration/deceleration distance of a CT bed, including an intelligent terminal, a control module, and a recording module; the CT bed monitoring system comprises a control module, a recording module and a control module, wherein the control module is used for controlling the CT bed to be started or stopped so as to form a starting instruction or a stopping instruction, and the recording module is used for recording the position information of the CT bed and cannot calculate the recorded position information; control module and record module set up respectively in intelligent terminal, and intelligent terminal connects the CT bed, and the connected mode can be wired connection or wireless connection, also can be through with intelligent terminal fixed connection on the CT bed.
Setting a speed threshold value in the recording module, after the control module forms a starting instruction, the CT bed receives the starting instruction and performs accelerated motion until the moving speed of the CT bed is equal to the speed threshold value, and recording the position information of the CT bed at the moment when the CT bed starts to perform accelerated motion by the recording module, wherein the position information is counted as L1(ii) a And when the moving speed of the CT bed is equal to the speed threshold value after the CT bed moves in an accelerated manner, the recording module records the position information of the CT bed at the moment and the position information is counted as L2And when the moving speed is equal to the speed threshold value, starting to move at a constant speed according to the speed threshold value.
When the control module forms a stop instruction during the process of the CT bed moving at a constant speed, the CT bed starts to decelerate when receiving the stop instruction, and the recording module records the position information of the CT bed at the moment and counts as L3And when the moving speed of the CT bed is gradually reduced until the CT bed completely stops, the recording module records the position information of the CT bed again.
Setting different speed thresholds to carry out reciprocating movement, obtaining acceleration distances and deceleration distances when the speed thresholds are different, calculating the acceleration distances and the deceleration distances obtained by the recording module according to the different acceleration thresholds respectively, and generating acceleration and deceleration distance curves according to the movement when the speed thresholds are different respectively. After the acceleration and deceleration distance curves are generated, the intelligent terminal operates each acceleration and deceleration distance curve respectively.
The smart terminal may be implemented in various forms. For example, the terminal described in the present invention may include an intelligent terminal such as a mobile phone, a smart phone, a notebook computer, a PDA (personal digital assistant), a PAD (tablet computer), a PMP (portable multimedia player), a navigation device, etc., and a fixed terminal such as a digital TV, a desktop computer, etc. In the following, it is assumed that the terminal is a smart terminal. However, it will be understood by those skilled in the art that the configuration according to the embodiment of the present invention can be applied to a fixed type terminal in addition to elements particularly used for moving purposes.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not by way of limitation, and that those skilled in the art can make modifications and variations of the embodiments described above without departing from the spirit of the invention.

Claims (9)

1. A method for automatically acquiring the acceleration and deceleration distance of a CT bed is characterized by comprising the following steps:
the CT bed receives the opening instruction, starts to operate and returns to the initial position of the zero point;
starting to accelerate the CT bed towards the direction of the machine tool after the CT bed returns to the initial position, and recording the position information when the CT bed starts to move as L1；
When the speed of the CT bed reaches the preset speed, the position information of the CT bed at the moment is counted as L2；
The CT bed receives the stop command, starts the deceleration movement and records the information of the CT bed at the moment as L3；
When the CT bed is completely still and does not perform deceleration movement any more, the position information of the CT bed when the CT bed stops is recorded as L4；
Respectively calculating an acceleration distance and a deceleration distance, wherein the acceleration distance is calculated by an equation of | L1-L2The deceleration distance is calculated as L3-L4|；
Repeating the steps to obtain the acceleration distance and the deceleration distance of the CT bed with different preset speeds;
and respectively generating acceleration and deceleration distance curves according to the acceleration distance and the deceleration distance obtained at different preset speeds, and respectively operating the CT bed according to each generated acceleration and deceleration distance curve.
2. The method of claim 1, wherein the first preset speed is 50mm/s and is repeated thereafter, each preset speed value is increased by 25mm/s on the previous basis.
3. The method according to claim 2, wherein the preset speed is less than or equal to 200 mm/s.
4. The method of claim 1, wherein the CT bed starts moving at a constant speed according to the preset speed after the speed of the CT bed reaches the preset speed until the CT bed receives the stop command.
5. The method of claim 4, wherein the distance of uniform motion of the CT bed is | L2-L3|。
6. The method according to claim 4, wherein when the CT bed does not move at a constant speed after reaching the preset speed, an error reporting command occurs, and the CT bed returns to the zero initial position and repeats the current preset speed to perform the accelerated motion.
7. The method according to claim 4, wherein when the CT bed moves at a constant speed and does not move at a reduced speed after pressing the stop command, an error reporting command occurs, and the CT bed returns to the zero initial position and repeats the current preset speed to perform the acceleration motion.
8. A system for acquiring acceleration and deceleration distances of a CT bed, comprising: the system comprises an intelligent terminal, a control module and a recording module; wherein the content of the first and second substances,
the control module for controlling the CT bed to be started and stopped and the recording module for recording the position information of the CT bed at each time are arranged in an intelligent terminal, and the intelligent terminal is connected with the CT bed;
a speed threshold value is set in the recording module, after the control module forms a starting instruction, the CT bed starts to move in an accelerated manner until the moving speed of the CT bed is equal to the speed threshold value, and the recording module respectively records the position information of the CT bed when the CT bed starts to move in an accelerated manner and counts the position information as L1And position information when the moving speed is equal to the speed threshold and is counted as L2；
After the control module forms a stop instruction, the CT bed starts to perform deceleration movement until the CT bed completely stops, and the recording module respectively records the position information of the CT bed when the CT bed starts to perform deceleration movement and counts the position information as L3And the position information when the CT bed is completely stopped and is counted as L4；
Reciprocating by using different speed thresholds to obtain acceleration distances and deceleration distances when the speed thresholds are different;
the recording module respectively calculates the acceleration distance and the deceleration distance obtained by different speed thresholds and respectively generates an acceleration and deceleration distance curve.
9. The system of claim 8, wherein the intelligent terminal controls the CT bed to run the generated acceleration and deceleration distance curves respectively.
CN202110886227.0A 2021-08-03 2021-08-03 Method and system for automatically acquiring acceleration and deceleration distance of CT (computed tomography) bed Pending CN113558652A (en)

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Publication number Priority date Publication date Assignee Title
JP2000308629A (en) * 1999-04-28 2000-11-07 Hitachi Medical Corp X-ray diagnostic device
JP2006212410A (en) * 2005-01-06 2006-08-17 Ge Medical Systems Global Technology Co Llc Radiation ct apparatus and its data processing method
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