CN107468266B - Scanning method and medical equipment - Google Patents
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- 238000002059 diagnostic imaging Methods 0.000 description 16
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Abstract
The application provides a scanning method, which is used for extracting historical locating piece data of an inspection object; the historical locating piece data comprises a historical locating piece obtained by performing locating scanning on the inspection object, a historical scanning range when the locating scanning is performed on the inspection object and a historical distance between the inspection object and the first reference object; in a current scanning stage, obtaining a current distance between the inspection object and a second reference object; determining a current scanning range of a current scanning stage according to a historical distance between the inspection object and a first reference object, a current distance between the inspection object and a second reference object and the historical scanning range; and scanning the inspection object according to the historical locating piece and the current scanning range. The application also provides a medical device which can execute the scanning method.
Description
Technical Field
The present application relates to the field of medical devices, and in particular, to a scanning method and a medical device using the same in the field of medical devices.
Background
The positioning sheet of the medical imaging apparatus, also called a flat sheet, is a preliminary image obtained by the medical imaging apparatus before a subsequent scanning examination is performed, and is used for marking a specific scanning range and position for the subsequent scanning. However, the medical imaging device usually exposes the examination object to a certain radiation dose.
In practical situations, the same examination subject may be subjected to medical imaging in multiple outpatients, which may require multiple scout scans, which undoubtedly aggravates the radiation dose to which the examination subject is subjected.
Disclosure of Invention
The application provides a scanning method and a medical device, which can reduce the radiation dose to the object to be checked and accelerate the scanning process.
Specifically, the method is realized through the following technical scheme:
one aspect of the present application provides a scanning method. The scanning method comprises the following steps: extracting historical locating piece data of an inspection object; the historical locating piece data comprises a historical locating piece obtained by performing locating scanning on the inspection object, a historical scanning range when the locating scanning is performed on the inspection object and a historical distance between the inspection object and the first reference object; in a current scanning stage, obtaining a current distance between the inspection object and a second reference object; determining a current scanning range of a current scanning stage according to a historical distance between the inspection object and a first reference object, a current distance between the inspection object and a second reference object and the historical scanning range; and scanning the inspection object according to the historical locating piece and the current scanning range.
Another aspect of the present application provides a medical device. The medical device includes: the data extraction module is used for extracting historical locating piece data of the inspection object; the historical locating piece data at least comprises a historical locating piece obtained by performing locating scanning on the inspection object, a historical scanning range when the positioning scanning is performed on the inspection object and a historical distance between the inspection object and the first reference object; distance measuring means for obtaining a current distance between the inspection object and the second reference object at a current scanning stage; a scanning range determining module, configured to determine a current scanning range of a current scanning stage according to a historical distance between the inspection object and a first reference object, a current distance between the inspection object and a second reference object, and the historical scanning range; and the scanning device is used for scanning the inspection object according to the historical locating piece and the current scanning range.
As can be seen from the above technical solutions, in the present application, the scanning region of the inspection object is controlled by controlling the scanning range of the CT apparatus, so that the scanning regions of the same inspection object in each scanning are the same, and the same scanning region means that the same positioning piece can be used by the same inspection object in each scanning. Therefore, even if the position of the same examination object relative to the scanning bed is different in each scanning, the repeated use of the positioning sheet can be realized by controlling the scanning range of the CT equipment, so that the radiation dose of the examination object is reduced, and the scanning process is accelerated.
Drawings
FIG. 1 is a schematic diagram of a coordinate system of a medical imaging device;
fig. 2 is a schematic structural diagram of a medical imaging apparatus according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a method provided by an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a horizontal distance between a head of an inspection object and a reference object according to an embodiment of the present application;
FIG. 5 is a schematic view of the horizontal distance between the foot of the subject under examination and the reference subject according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram illustrating a method for determining a current scanning range according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of another method for determining a current scanning range according to an embodiment of the present application;
FIG. 8 is a schematic diagram of another method for determining a current scanning range according to an embodiment of the present disclosure;
FIG. 9 is a schematic view of a scanning position marked with a spacer according to an embodiment of the present application;
fig. 10 is a block diagram of a medical device according to an embodiment of the present application.
Detailed Description
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 embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application 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 application. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
Hereinafter, some terms in the present application will be explained first.
Bed height of the scanning bed: refers to the height of the scanning bed in the vertical direction. The bed height of the scanning bed of the medical imaging equipment is adjustable, and the current bed height can be displayed on the medical imaging equipment in real time.
Bed code of scanning bed: the scale marked along the length of the scanning bed is the actual bed code. The bed code can be marked in a mode that the direction scales from the bed head to the bed tail are gradually increased, and the bed code can also be marked in a mode that the direction scales from the bed tail to the bed head are gradually increased. For example, assuming that the length of the scanning bed is 2 meters (unit: m), the bed code of the scanning bed may be marked as 0mm (unit: mm) -2000mm at millimeter intervals from the bed head to the bed. The current bed code can be displayed on the medical imaging equipment in real time. In one embodiment, the bed size may be gradually increased for in-bed scanning (i.e., the scanning bed moves closer to the gantry of the medical device), whereas the bed size may be gradually decreased for out-of-bed scanning (i.e., the scanning bed moves away from the gantry), but is not limited thereto. The scanning range in this application is indicated by the bed code of the scanning bed.
Zero bed code of scanning bed: the bed code at the starting position of scanning can be set to be zero, and the bed codes at other positions can be adjusted relative to the zero bed code to obtain the relative bed code. The actual bed code at the start of the scan may or may not be zero. For example, assuming that when a scan is performed, the bed size at the start position of the scan is 100mm, the bed size at the end position of the scan is 400mm, and the scan length is 300mm, these values can be displayed on the software interface of the console of the medical imaging apparatus. The bed size 100mm at the start position may be set as the zero bed size, the current bed size is set to 0mm, and the other bed sizes are adjusted with respect to the zero bed size, so that the relative bed size at the end position becomes 300 mm. By setting the zero bed code and the relative bed code, the initial position of starting scanning can be recorded from 0mm, so that the recording is convenient.
Coordinate system of medical imaging equipment: a common form of coordinate system is shown in fig. 1, and the start position and the end position of the scanning refers to the position in the Z-axis direction, and the scanning bed can move in and out of the bed along the Z-axis direction.
Checking body position: i.e. the body position of the examination subject lying on the scanning bed. Commonly used examination positions are: HFP (Head First stone, which means that the Head is close to the front of the medical device and the face is downward), HFS (Head First stone, which means that the Head is close to the front of the medical device and the face is upward), FFP (heel First stone, which means that the Feet are close to the front of the medical device and the face is downward), FFS (heel First stone, which means that the Feet are close to the front of the medical device and the face is upward), HFDR (Head First Decubitus Right, which means that the Head is close to the front of the medical device, on the side, and Right shoulder is downward), HFDL (Head First Decubitus Left, which means that the Head is close to the front of the medical device, on the side, and Left shoulder is downward), FFDR (heel First Decubitus Right, which means that the Feet are close to the front of the medical device, on the side, and Right shoulder is downward), and FFDL (heel First Decubitus Left, which means that the Head is close to the front of the medical device, on the side, and Left shoulder is downward). The above list only shows some typical examination positions, but the practical application is not limited to the above listed examination positions.
The technical scheme of the invention is explained by combining the drawings and various embodiments in the specification.
At present, some medical imaging devices have a function of reusing positioning sheets, and the main purpose of the function is as follows: if different sequences of scans are registered in the same examination object, the examination object only needs to perform one positioning scan, and the acquired positioning sheet can be reused in subsequent scans through the functions, so that the radiation dose to the examination object is reduced, and the scanning process is accelerated.
However, in clinical applications, the following conditions may be satisfied if the above functions are to be used:
1) in subsequent scanning, the bed height and the zero bed code of the scanning bed need to be consistent with those of the positioning scanning;
2) in subsequent scanning, the examination body position of the examination object needs to be consistent with the examination body position when positioning scanning is executed;
3) in the subsequent scan, the position of the inspection object on the scanning bed needs to be kept consistent with the position when the scout scan is performed.
The first and second points of the above conditions are easier to satisfy, but the third point is harder to satisfy, and the position of the examination object with respect to the table may differ from scan to scan. This means that existing medical imaging devices function as dummies with reusable topograms, which are almost certainly rescanned for a patient under review.
Therefore, the application provides a scanning method of the medical imaging equipment, which realizes that the same scanning part of the examination object can use the same locating plate in different scanning processes by controlling the scanning range of the medical imaging equipment. Thus, even if the position of the same examination object relative to the scanning bed is different in different scans, the medical equipment can be controlled to scan the range to realize the repeated use of the positioning sheet.
The method provided by the application can be applied to medical imaging equipment with a locating piece scanning function, such as CT equipment. For simplicity, the method is described below by taking a CT apparatus as an example.
The CT apparatus provided in the present application is described first as follows:
the distance measuring device is added on the basis of the existing CT equipment, and can be installed on the existing components of the CT equipment, such as a scanning bed of the CT equipment; alternatively, the distance measuring device can also be a separate component, which can be mounted in a fixed position, for example in the form of a bracket.
Referring to fig. 2, a possible structure of the CT apparatus is shown, wherein only the distance measuring device 21, the scanning bed 22, the gantry 23, the console 24, and other components are shown in fig. 2, and the rest components are not shown. In fig. 2, the distance measuring device 21 is mounted on the head of a scanning bed 22.
The distance measuring device 21 provided by the present application can be used for measuring the distance between an inspection object and a reference object. The reference object may be the distance measuring device 21 itself, or may be another fixed point, such as the head of a scanning bed; in addition, in different scanning stages, the selected reference objects may be the same or different, and the application is not particularly limited.
The present application controls the scanning range of the CT apparatus in different scanning phases based on the distances between the examination object and the reference object measured in the different scanning phases. As to how to specifically control the scanning range of the CT apparatus based on the distance between the examination object and the reference object will be described below, detailed description thereof will be omitted.
The distance measuring device 21 may include at least one of a contact distance measuring device and a noncontact distance measuring device. The contact distance measuring device comprises a caliper, and the non-contact distance measuring device comprises an ultrasonic detector and/or an infrared detector.
The present application does not limit the placement position of the distance measuring device 21, which may be located on the Z-axis (i.e., horizontal direction) of the coordinate system of the CT apparatus, such as the placement position shown in fig. 2; or may be at an angle to the Z-axis of the coordinate system of the CT device.
The scanning bed 22 is a tool for carrying an inspection object to perform a scanning task, and can move in and out of a scanning chamber of the gantry 23 according to a program requirement or an operation of an operator, and the like, to perform positioning of a scanning position of the inspection object. In one embodiment, the gantry 23 houses X-ray tubes, filters, collimators, reference detectors, and various electronics. When the object to be examined is on the scanning bed and passes through the scanning cavity of the gantry 23, the X-rays emitted by the X-ray tube on the gantry 23 will pass through the object to be examined to obtain the X-rays attenuated by the object to be examined, and then the image of the scanning part of the object to be examined is obtained through the image processing system at the rear end.
In the present application, the main console 24 may be used to control the power on/off of the whole machine, input a working instruction, store scan data, and/or perform various technical processes on an image according to a diagnosis requirement, and may also be used to record a positioning sheet obtained by performing positioning scan, and a historical distance between an inspection object and a reference object measured by the distance measuring device 21 at that time. In one embodiment, the console 24 may also record the bed height, zero bed code, the examination position of the examination object, and the Identification (ID) of the examination object at the time of scout scan. The data may be stored together in a database of the console. And subsequently, when receiving the indication of the reuse of the positioning sheet, at least part of the data is extracted from the database and is delivered to a computer system of the CT device to calculate the current scanning range of the current scanning stage.
As to how the CT apparatus calculates the current scanning range of the current scanning stage for the purpose of reusing the positioning sheet, the method will be described by the method flow shown in fig. 3, and the method can be applied to the CT apparatus with distance measuring device provided in the present application. The method may comprise steps 301-304 as shown in fig. 3.
Before describing the steps of the method, an application scenario of the method is exemplarily described below.
For example, when a CT scout scan is performed for the first time on an examination object (e.g., a patient), the CT apparatus may store the acquired scout strip in the database of the CT console, along with the distance between the examination object and the first reference object, the bed height of the scanning bed, the zero bed code of the scanning bed, the examination position of the examination object, and the ID of the examination object, which are measured at that time. After several days, when the same examination object needs to be rescanned due to the repeated examination, if the operator decides to use the positioning sheet obtained by the examination object last time, the operator can trigger the positioning sheet reuse instruction to the CT device. After receiving the instruction, the CT device executes the method shown in fig. 3, and next, various steps included in the method are described.
Step 301: extracting historical locating piece data of an inspection object; the historical topogram data includes a historical topogram obtained by performing a scout scan on the inspection object, a historical scan range when performing a scout scan on the inspection object, and a historical distance between the inspection object and the first reference object.
Specifically, the CT device may extract, according to the ID of the inspection object carried in the received spacer reuse indication, historical spacer data corresponding to the ID from the database of the CT console.
Step 302: in the current scanning phase, a current distance between the examination object and the second reference object is obtained.
As already mentioned, if the distance measuring device of the CT system comprises a contact distance measuring device, the current distance between the examination object and the second reference object can be measured in a contact manner. If the distance measuring device of the CT system comprises a contactless distance measuring device, the current distance between the examination object and the second reference object can be measured in a contactless manner.
The reference object may be located on a Z-axis (i.e., a horizontal direction) of a coordinate system of the CT apparatus, or may form a certain angle with the Z-axis of the coordinate system of the CT apparatus. In one embodiment, the reference object may be located on a Z-axis of a coordinate system of the CT apparatus, such that the historical distance measured by the distance measuring device is a horizontal distance between the inspection object and the first reference object, and the current distance measured is a horizontal distance between the inspection object and the second reference object, which may facilitate calculation of the current scanning range of the current scanning stage.
The second reference object may be the same as or different from the first reference object. In one embodiment, the same reference object may be selected in different scanning stages, i.e. the first reference object of the previous scanning stage is made the same as the second reference object of the current scanning stage.
In one embodiment, taking the body position of the examination as HFS as an example, if the distance measuring device is installed in the direction of the head of the scanning bed and the distance measuring device is selected as the reference object, the distance between the examination object and the reference object can be obtained by measuring the horizontal distance between the head of the examination object and the distance measuring device, as shown in fig. 4.
In another embodiment, still taking the body position of the examination subject as HFS as an example, if the distance measuring device is installed in the direction of the bed tail of the scanning bed and the distance measuring device is selected as the reference object, the distance between the detection object and the reference object can be obtained by measuring the horizontal distance between the foot of the examination object and the distance measuring device, as shown in fig. 5. The above list only illustrates two examples, but is not limited thereto.
Step 303: and determining the current scanning range of the current scanning stage according to the historical distance between the inspection object and the first reference object, the current distance between the inspection object and the second reference object and the historical scanning range.
In one embodiment, the first reference object and the second reference object are the same, and the current scanning range in the current scanning stage can be determined according to the historical distance, the current distance and the historical scanning range. In another embodiment, the first reference object and the second reference object are different, and the current scanning range of the current scanning stage may be determined according to the historical distance, the current distance, the historical scanning range, and a relative horizontal distance between the first object and the second reference. Under different scenes, the specific process of determining the current scanning range of the current scanning stage is as follows:
scene one: the first reference object and the second reference object are identical.
The implementation of step 303 is now illustrated in conjunction with fig. 6.
In a first step, it is determined that a historical horizontal distance between the examination object and the first reference object when the CT scout scan is performed is L1, and a current horizontal distance between the examination object and the second reference object at the current scan stage is L2.
If the reference object is located on the Z axis (namely the horizontal direction) of the coordinate system of the CT equipment, the historical distance measured by the distance measuring device is the horizontal distance between the checking object and the first reference object, and the measured current distance is the horizontal distance between the checking object and the second reference object; if the reference object is at an angle to the Z-axis of the coordinate system of the CT apparatus, further calculation of the historical distance and the horizontal distance measured by the distance measuring device is required, for example, the horizontal distance between the inspection object and the first reference object and the horizontal distance between the inspection object and the second reference object can be obtained by combining the angle between the reference object and the Z-axis.
In the second step, L1 is subtracted from L2 to obtain D ═ L2 to L1. Wherein D can be used to characterize the change of the examination object in the two scans relative to the scanning bed.
The value of D may be greater than 0, equal to 0, or less than 0. When D <0, it means that the inspection object is closer to the reference object in the next scan (i.e., the current scan); when D >0, it indicates that the examination object is closer to the reference object in the previous scan (i.e., CT scout scan); when D is 0, it indicates that the position of the inspection object with respect to the reference object is the same in both scans.
And thirdly, after obtaining D, obtaining a historical scanning range [ S1_ min, S1_ max ] of the CT device when performing CT positioning scanning by combining the CT device, so as to obtain a current scanning range [ S2_ min, S2_ max ] of the CT device at the current scanning stage, wherein S2_ min is S1_ min + D, and S2_ max is S1_ max + D. For ease of understanding, the process of obtaining the current scanning range [ S2_ min, S2_ max ] may be understood as: when D <0, it is equivalent to move the history scanning range [ S1_ min, S1_ max ] by | D | (representing the absolute value of D) units as a whole in the direction of the reference object; when D >0, corresponding to moving the historical scanning range [ S1_ min, S1_ max ] to the direction far away from the reference object by | D | units; when D is 0, the history scanning range [ S1_ min, S1_ max ] is kept unchanged.
Scene two: the first reference object and the second reference object are different, the first reference object and the second reference object are located on the same side of the examination object, and the current distance is smaller than the historical distance (i.e. the second reference object is closer to the examination object than the first reference object).
The implementation of step 303 is now illustrated in conjunction with fig. 7.
In a first step, it is determined that a historical horizontal distance between the examination object and the first reference object when the CT scout scan is performed is L1, and a current horizontal distance between the examination object and the second reference object at the current scan stage is L2.
In a second step, a relative horizontal distance d between the first reference object and the second reference object is determined.
And thirdly, calculating D-L2-L1 + D. Wherein D can be used to characterize the change of the examination object in the two scans relative to the scanning bed.
And fourthly, after obtaining D, combining with a historical scanning range [ S1_ min, S1_ max ] of the CT device when performing CT positioning scanning, so as to obtain a current scanning range [ S2_ min, S2_ max ] of the CT device at the current scanning stage, wherein S2_ min is S1_ min + D, and S2_ max is S1_ max + D.
Scene three: the first reference object and the second reference object are different, the first reference object and the second reference object are located on the same side of the examination object, and the current distance is greater than the historical distance (i.e., the first reference object is closer to the examination object than the second reference object).
The implementation of step 303 is now illustrated in conjunction with fig. 8.
In a first step, it is determined that a historical horizontal distance between the examination object and the first reference object when the CT scout scan is performed is L1, and a current horizontal distance between the examination object and the second reference object at the current scan stage is L2.
In a second step, a relative horizontal distance d between the first reference object and the second reference object is determined.
And thirdly, calculating D-L2-L1-D. Wherein D can be used to characterize the change of the examination object in the two scans relative to the scanning bed.
And fourthly, after obtaining D, combining with a historical scanning range [ S1_ min, S1_ max ] of the CT device when performing CT positioning scanning, so as to obtain a current scanning range [ S2_ min, S2_ max ] of the CT device at the current scanning stage, wherein S2_ min is S1_ min + D, and S2_ max is S1_ max + D.
Scene four, the first reference object and the second reference object are different and the first reference object and the second reference object are located on different sides of the examination object.
The reasoning process of this scenario is similar to the above three scenarios, but it is more computationally complex, and in addition, it is necessary to know additional parameters such as the height of the object under examination, and it is also necessary to dispose distance measuring devices on both sides of the object under examination, which is of little practical value, so that the present application will not be described in detail.
Step 304: and scanning the inspection object according to the historical locating piece and the current scanning range.
Further, the historical scout piece data extracted in step 301 may further include a historical bed height of the scanning bed, a historical zero bed code of the scanning bed, and a historical examination body position of the examination object when the examination object performs scout scan.
Based on this, what the CT device obtains in step 302 may be a current distance between the examination object and a second reference object in the historical examination body position; and in step 304, the CT apparatus may scan the examination object according to the historical locator card and the current scanning range when the scanning bed is adjusted to the historical bed height and the historical zero bed code and the examination object maintains the historical examination body position.
In a clinical environment, after determining a current scanning range of an examination object at a current stage, the CT apparatus may display a history locating piece and a locating frame for marking a scanning position on an operation interface, as shown in fig. 9. An operator can drag the positioning frame to a part needing to be scanned through a mouse, adjust the size of the frame, determine the scanning position and trigger scanning indication. The CT device can further determine a specific scanning position, including a scanning start position and a scanning end position, in the current scanning range according to the positioning frame, so as to directly enter subsequent helical scanning or tomography.
In summary, the technical solution provided by the present application controls the same scanning region of the examination object by controlling the scanning range of the CT apparatus, and the same positioning plate can be used in different scans. Therefore, even if the position of the same examination object relative to the scanning bed is different in each scanning, the repeated use of the positioning sheet can be realized by controlling the scanning range of the CT equipment, so that the radiation dose of the examination object is reduced, and the scanning process is accelerated.
FIG. 10 is a block diagram of an embodiment of the CT device of FIG. 2 provided herein. The apparatus comprises a data extraction module 251, a distance measuring device 21, a scanning range determination module 252 and a scanning device 231.
The data extraction module 251 is used for extracting historical locating piece data of the inspection object; the historical topogram data may include a historical topogram resulting from performing a scout scan of the examination object, a historical scan range when performing a scout scan of the examination object, and a historical distance between the examination object and the first reference object.
A distance measuring means 21 for obtaining a current distance between the examination object and the second reference object at the current scanning stage.
A scan range determining module 252, configured to determine a current scan range of the current scan stage according to the historical distance between the inspection object and the first reference object, the current distance between the inspection object and the second reference object, and the historical scan range.
And the scanning device 231 is positioned in the rack 23 and is used for scanning the inspection object according to the historical locating piece and the current scanning range.
In one embodiment, the first reference object and the second reference object may be the same.
Based on this, the scanning device 231 is specifically configured to: subtracting the historical distance between the inspection object and the first reference object from the current distance between the inspection object and the second reference object to obtain a difference value; obtaining a current scanning range of a current scanning stage according to the difference and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the difference and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the difference and the maximum value of the historical scanning range
In another embodiment, the first reference object and the second reference object are different, the first reference object and the second reference object are located on the same side of the examination object, and the current distance is smaller than the historical distance.
Based on this, the scanning device 231 is specifically configured to: determining a relative distance between the first reference object and the second reference object; subtracting the historical distance between the inspection object and a second reference object from the current distance between the inspection object and the second reference object to obtain a difference value, and calculating the sum of the difference value and the relative distance between the first reference object and the second reference object; and obtaining a current scanning range of a current scanning stage according to the sum and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the sum and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the sum and the maximum value of the historical scanning range.
In yet another embodiment, the first reference object and the second reference object are different, the first reference object and the second reference object are located on the same side of the examination object, and the current distance is greater than the historical distance.
Based on this, the scanning device 231 is specifically configured to: determining a relative distance between the first reference object and the second reference object; subtracting the historical distance between the inspection object and a first reference object from the current distance between the inspection object and a second reference object to obtain a first difference value, and subtracting the relative distance between the first reference object and the second reference object from the first difference value to obtain a second difference value; and obtaining a current scanning range of a current scanning stage according to the second difference and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the second difference and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the second difference and the maximum value of the historical scanning range.
In one embodiment, the historical scout data extracted by the data extraction module 251 may further include a historical bed height of a scanning bed, a historical zero bed code of the scanning bed, and a historical examination body position of the examination object when performing scout scan on the examination object. Correspondingly, the distance measuring device 21 may be configured to obtain a current distance between the examination object and a second reference object in the historical examination body position at a current scanning stage; and the scanning device 231 may be specifically configured to scan the examination object according to the historical locator card and the current scanning range when the scanning bed 22 is adjusted to the historical bed height and the historical zero bed code and the examination object maintains the historical examination body position.
In this embodiment, the CT apparatus may further include a memory 25, a processor 26, a display unit 27, and an input device 28.
The memory 25 is used for storing program instructions executed by the data extraction module 251 and program instructions executed by the scan range determination module 252. And the memory 25 may also be used to store historical topogram data for the object under examination. The memory 25 may be a magnetic storage medium or an optical storage medium such as a hard disk, a memory chip, etc., but is not limited thereto.
And a processor 26 for executing program instructions executed by the data extraction module 251 and program instructions executed by the scan range determination module 252. Among them, the processor 26 executes the program instructions executed by the data extraction module 251, and the program instructions executed by the scan range determination module 252, respectively as the operations executed by the data extraction module 251 and the operations executed by the scan range determination module 252.
And a display device 27 for displaying the history positioning sheet and the positioning frame for marking the scanning position. The display device 27 may include a liquid crystal display, a cathode ray tube display, a plasma display, or the like.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (10)
1. A scanning method, comprising:
extracting historical locating piece data of an inspection object; the historical locating plate data at least comprises a historical locating plate obtained by performing locating scanning on the inspection object, a historical scanning range when the positioning scanning is performed on the inspection object, a historical distance between the inspection object and a first reference object, a historical bed height of a scanning bed, a historical zero bed code of the scanning bed and a historical inspection body position of the inspection object;
in a current scanning phase, obtaining a current distance between an inspection object and a second reference object, wherein the first reference object and the second reference object are the same or different;
determining a current scanning range of a current scanning stage according to a historical distance between the inspection object and a first reference object, a current distance between the inspection object and a second reference object and the historical scanning range;
scanning an inspection object according to the historical locating piece and the current scanning range;
the scanning the inspection object according to the historical locator card and the current scanning range comprises:
when the scanning bed is adjusted to the historical bed height and the historical zero bed code and the inspection object keeps the historical inspection body position, scanning the inspection object at least according to the historical locating piece and the current scanning range;
the bed code of the scanning bed is a scale marked along the length of the scanning bed, and the historical zero bed code is the bed code of the scanning starting position.
2. The method of claim 1, wherein determining a current scan range for a current scan stage based on the historical distance, the current distance, and the historical scan range when the first reference object and the second reference object are the same comprises:
determining a historical horizontal distance between the examination object and the first reference object according to the historical distance, and determining a current horizontal distance between the examination object and the second reference object according to the current distance;
subtracting the historical horizontal distance from the current horizontal distance to obtain a difference value;
and obtaining a current scanning range of a current scanning stage according to the difference and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the difference and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the difference and the maximum value of the historical scanning range.
3. The method of claim 1, wherein when the first reference object and the second reference object are different, the first reference object and the second reference object are located on a same side of the inspection object, and the current distance is less than the historical distance; determining a current scanning range of a current scanning stage according to the historical distance, the current distance and the historical scanning range, wherein the determining comprises:
determining a historical horizontal distance between the examination object and the first reference object according to the historical distance, and determining a current horizontal distance between the examination object and the second reference object according to the current distance;
determining a relative horizontal distance between the first reference object and the second reference object;
subtracting the historical horizontal distance from the current horizontal distance to obtain a difference value, and calculating the sum of the difference value and the relative horizontal distance;
and obtaining a current scanning range of a current scanning stage according to the sum and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the sum and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the sum and the maximum value of the historical scanning range.
4. The method of claim 1, wherein when the first reference object and the second reference object are different, the first reference object and the second reference object are located on a same side of the inspection object, and the current distance is greater than the historical distance; determining a current scanning range of a current scanning stage according to the historical distance, the current distance and the historical scanning range, wherein the determining comprises:
determining a historical horizontal distance between the examination object and the first reference object according to the historical distance, and determining a current horizontal distance between the examination object and the second reference object according to the current distance;
determining a relative horizontal distance between the first reference object and the second reference object;
subtracting the historical horizontal distance from the current horizontal distance to obtain a first difference value, and subtracting the relative horizontal distance from the first difference value to obtain a second difference value;
and obtaining a current scanning range of a current scanning stage according to the second difference and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the second difference and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the second difference and the maximum value of the historical scanning range.
5. The method of claim 1, wherein obtaining a current distance between the inspection object and a second reference object at the current scanning stage comprises:
in a current scanning phase, a current distance between the examination object and a second reference object in the historical examination body position is obtained.
6. A medical device, comprising:
the data extraction module is used for extracting historical locating piece data of the inspection object; the historical locating plate data at least comprises a historical locating plate obtained by performing locating scanning on the inspection object, a historical scanning range when the positioning scanning is performed on the inspection object, a historical distance between the inspection object and a first reference object, a historical bed height of a scanning bed, a historical zero bed code of the scanning bed and a historical inspection body position of the inspection object;
distance measuring means for obtaining a current distance between an examination object and a second reference object at a current scanning stage, wherein the first reference object and the second reference object are the same or different;
a scanning range determining module, configured to determine a current scanning range of a current scanning stage according to a historical distance between the inspection object and a first reference object, a current distance between the inspection object and a second reference object, and the historical scanning range;
the scanning device is used for scanning the inspection object according to the historical locating piece and the current scanning range;
the scanning device is specifically configured to scan the inspection object according to at least the historical positioning sheet and the current scanning range when the scanning bed is adjusted to the historical bed height and the historical zero bed code and the inspection object keeps the historical inspection body position;
the bed code of the scanning bed is a scale marked along the length of the scanning bed, and the historical zero bed code is the bed code of the scanning starting position.
7. The medical device of claim 6, wherein when the first reference object and the second reference object are the same; the scanning device is specifically configured to:
subtracting the historical distance from the current distance to obtain a difference value;
and obtaining a current scanning range of a current scanning stage according to the difference and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the difference and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the difference and the maximum value of the historical scanning range.
8. The medical device of claim 6, wherein when the first reference object and the second reference object are different, the first reference object and the second reference object are located on a same side of the examination object, and the current distance is less than the historical distance; the scanning device is specifically configured to:
determining a relative distance between the first reference object and the second reference object;
subtracting the historical distance from the current distance to obtain a difference value, and calculating the sum of the difference value and the relative distance;
and obtaining a current scanning range of a current scanning stage according to the sum and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the sum and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the sum and the maximum value of the historical scanning range.
9. The medical device of claim 6, wherein when the first reference object and the second reference object are different, the first reference object and the second reference object are located on a same side of the examination object, and the current distance is greater than the historical distance; the scanning device is specifically configured to:
determining a relative distance between the first reference object and the second reference object;
subtracting the historical distance from the current distance to obtain a first difference value, and subtracting the relative distance from the first difference value to obtain a second difference value;
and obtaining a current scanning range of a current scanning stage according to the second difference and the historical scanning range, wherein the minimum value of the current scanning range is the sum of the second difference and the minimum value of the historical scanning range, and the maximum value of the current scanning range is the sum of the second difference and the maximum value of the historical scanning range.
10. The medical device of claim 6,
the distance measuring device is specifically configured to obtain, at a current scanning stage, a current distance between the examination object and a second reference object in the historical examination body position.
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| CN108634975A (en) * | 2018-04-26 | 2018-10-12 | 沈阳东软医疗系统有限公司 | Scan orientation method and apparatus |
| CN108652653B (en) * | 2018-05-28 | 2022-03-25 | 上海联影医疗科技股份有限公司 | Method and device for shooting medical image, medical image system and storage medium |
| EP3809970A4 (en) | 2018-05-28 | 2021-06-30 | Shanghai United Imaging Healthcare Co., Ltd. | Systems and methods for taking x-ray images |
| CN112932522A (en) * | 2021-02-03 | 2021-06-11 | 上海联影医疗科技股份有限公司 | Medical image acquisition method and device and computer equipment |
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