CN110057610B - Vibration information determination method and device, medical imaging equipment and storage medium - Google Patents
Vibration information determination method and device, medical imaging equipment and storage medium Download PDFInfo
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Abstract
The embodiment of the invention discloses a vibration information determination method and device, medical imaging equipment and a storage medium. The method comprises the following steps: acquiring scanning data generated by scanning a die body; determining actual centroid coordinates of the die body under different sampling angles according to the scanning data; and determining vibration information of the scanning bed bearing the die body according to each actual mass center coordinate. According to the technical scheme of the embodiment of the invention, the vibration information of the scanning bed in the medical imaging equipment is determined based on the scanning data generated by the medical imaging equipment scanning die body, and other hardware equipment does not need to be additionally introduced for auxiliary detection of the vibration information, so that the cost of manpower and material resources is reduced; meanwhile, due to the fact that introduction of hardware equipment and migration of a software method corresponding to the vibration information are not needed, error sources and error transmission are reduced, and the measurement accuracy of the vibration information is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of medical imaging, in particular to a vibration information determining method and device, medical imaging equipment and a storage medium.
Background
When medical imaging equipment is adopted to scan an object to be detected, the stability of a scanning bed and the object to be detected has great influence on the imaging quality of the imaging equipment. When the scanning bed and the object to be detected vibrate in the scanning process, discontinuity exists in scanning data generated by scanning, and low-frequency high-density or low-density artifacts can be generated on an image reconstructed based on the scanning data. Therefore, detecting the vibration of the scanning bed is important in the image scanning process.
In the prior art, when the vibration condition of the scanning bed is detected, hardware devices such as a camera are usually additionally arranged for medical imaging devices, and the vibration information of the scanning bed is obtained by performing complex post-processing on images acquired by the camera.
Because this hardware equipment of camera has additionally been introduced among the prior art, need carry out the accurate settlement to the mounted position of camera between equipment simultaneously, increased manpower and material resources cost. And because the image collected by the camera is post-processed, the vibration condition of the scanning bed of the medical imaging equipment is indirectly determined, and through the introduction of hardware equipment and the migration of a software method, error sources are increased, and the measurement precision is reduced.
Disclosure of Invention
The invention provides a vibration information determination method and device, medical imaging equipment and a storage medium, which are used for reducing hardware cost and labor input when determining the vibration condition of a scanning bed of the medical imaging equipment and improving measurement accuracy.
In a first aspect, an embodiment of the present invention provides a method for determining vibration information, including:
acquiring scanning data generated by scanning a die body;
determining actual centroid coordinates of the die body under different sampling angles according to the scanning data;
and determining vibration information of the scanning bed bearing the die body according to each actual mass center coordinate.
In a second aspect, an embodiment of the present invention further provides a vibration information determining apparatus, including:
the scanning data acquisition module is used for acquiring scanning data generated by scanning the die body;
the actual centroid coordinate determination module is used for determining actual centroid coordinates of the die body under different sampling angles according to the scanning data;
and the vibration information determining module is used for determining the vibration information of the scanning bed bearing the die body according to each actual mass center coordinate.
In a third aspect, an embodiment of the present invention further provides a medical imaging apparatus, including a scanning bed and a scanning gantry, the apparatus further including:
one or more processors;
a memory for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement a method for determining vibration information as provided in an embodiment of the first aspect.
In a fourth aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements a vibration information determination method as provided in the first aspect.
The embodiment of the invention obtains the scanning data generated by scanning the die body; determining actual centroid coordinates of the die body under different sampling angles according to the scanning data; and determining the vibration information of the scanning bed bearing the die body according to the actual mass center coordinates. According to the technical scheme, the vibration information of the scanning bed in the medical imaging equipment is determined based on the scanning data generated by the medical imaging equipment scanning the mould body, other hardware equipment does not need to be additionally introduced for auxiliary detection of the vibration information, and the cost of manpower and material resources is reduced; meanwhile, due to the fact that introduction of hardware equipment and migration of a software method corresponding to the vibration information are not needed, error sources and error transmission are reduced, and the measurement accuracy of the vibration information is improved.
Drawings
Fig. 1 is a flowchart of a vibration information determination method according to a first embodiment of the present invention;
fig. 2 is a flowchart of a vibration information determination method according to a second embodiment of the present invention;
fig. 3A is a flowchart of a vibration information determination method according to a third embodiment of the present invention;
fig. 3B is a schematic view of scan data of a metal needle according to a third embodiment of the present invention;
FIG. 3C is a schematic diagram of an actual centroid coordinate curve in a third embodiment of the present invention;
FIG. 3D is a schematic diagram of a residual curve when the vibration of the scanning bed is small according to a third embodiment of the present invention;
FIG. 3E is a schematic diagram of a residual curve when the vibration of the scanning bed is large according to the third embodiment of the present invention;
fig. 4 is a structural diagram of a vibration information determination apparatus in a fourth embodiment of the present invention;
fig. 5 is a schematic structural diagram of a medical imaging apparatus according to a fifth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a vibration information determining method according to a first embodiment of the present invention, which is suitable for a situation where vibration information of a scanning bed included in a medical imaging device is detected before a detection object is detected by the medical imaging device. The method is executed by a vibration information determination device which is realized by software and/or hardware and is specifically configured in the medical imaging equipment. The medical imaging device may be a Computed Tomography (CT) device.
A method for determining vibration information as shown in fig. 1 includes:
and S110, acquiring scanning data generated by scanning the phantom.
The mold body may be an object of uniform material with a certain hardness, such as a metal mold body or a hard plastic mold body. Illustratively, metals having an atomic number greater than aluminum may be employed.
Optionally, the scanning data may be scanning data generated in real time after the phantom is scanned by the medical imaging device, and then the generated scanning data is acquired in real time or at regular time. Or optionally, the scanning data generated by scanning the phantom is pre-stored in the local medical imaging device, other storage devices associated with the medical imaging device or the cloud, and is acquired from the local medical imaging device, the other associated storage devices or the cloud when needed.
And S120, determining the actual centroid coordinates of the die body under different sampling angles according to the scanning data.
Exemplarily, the scanning data corresponding to any axial section of the phantom may be selected, and the scanning data at different sampling angles may be processed by at least one of weight method and gaussian fitting method, so as to obtain the actual centroid coordinates at each sampling angle.
Optionally, in order to improve the accuracy of the obtained actual centroid coordinate, the actual centroid coordinate of the die body at different angles may be respectively determined for the scan data corresponding to the plurality of axial sections; and averaging the actual centroid coordinates under the same sampling angle to obtain the final actual centroid coordinates.
And S130, determining vibration information of the scanning bed bearing the phantom according to each actual centroid coordinate.
Optionally, the vibration information of the scanning bed bearing the phantom is determined according to each actual centroid coordinate, which may be by acquiring each theoretical centroid coordinate corresponding to the scanning bed configured for the currently used medical imaging device, and determining the vibration information of the scanning bed bearing the phantom according to a difference between each actual centroid coordinate and each theoretical centroid coordinate.
Or optionally, determining the vibration information of the scanning bed bearing the mold body according to each actual centroid coordinate, wherein the fluctuation degree of the actual centroid coordinate can be determined directly according to each actual centroid coordinate at each sampling angle; and determining the vibration information of the scanning bed bearing the die body according to the difference between the fluctuation degree and the set fluctuation threshold value. Wherein the set fluctuation threshold is set by a technician based on empirical values or determined based on a limited number of tests performed on the scanning bed.
Or optionally, determining the vibration information of the scanning bed bearing the mold body according to each actual centroid coordinate, fitting a centroid curve according to each actual centroid coordinate, and obtaining each theoretical centroid coordinate corresponding to the centroid curve; and determining the vibration information of the scanning bed bearing the die body according to each theoretical centroid coordinate and each actual centroid coordinate.
In an optional embodiment of the present invention, the vibration information of the scanning bed bearing the phantom is determined according to each actual centroid coordinate, a centroid curve may be fitted according to each actual centroid coordinate, and each theoretical centroid coordinate corresponding to the centroid curve is obtained, or a centroid curve may be fitted according to each actual centroid coordinate, and a centroid value corresponding to each sampling angle in the centroid curve is obtained as the theoretical centroid coordinate. The fitted centroid curve can be fitted according to a curve model known in advance to obtain relevant parameters in the curve model.
In an optional embodiment of the present invention, the vibration information of the scanning bed bearing the phantom is determined according to each theoretical centroid coordinate and each actual centroid coordinate, and may be a residual value corresponding to each sampling angle determined according to the theoretical centroid coordinate and the actual centroid coordinate at the same sampling angle; and acquiring the maximum peak value of each residual value, and determining the vibration information of the scanning bed bearing the die body according to the maximum peak value.
For example, the vibration information of the scanning bed bearing the phantom is determined according to the maximum peak value, which may be a vibration amplitude obtained by multiplying the maximum peak value by a preset value, as the vibration information of the scanning bed bearing the phantom. The preset value can be determined by the size and the position relation of the mechanical structure of the medical imaging equipment.
Due to different materials and structures of the scanning beds, corresponding residual values of different scanning beds at different sampling angles are different; in addition, the corresponding residual values of the same scanning bed under the same installation environment and at each sampling angle are correspondingly the same. Therefore, in order to maximally utilize the relevant data in the process of determining the vibration information and reduce the determination times of the vibration information in the service life cycle of the scanning bed, after determining the residual error value corresponding to each sampling angle according to the theoretical centroid coordinate and the actual centroid coordinate under the same sampling angle, the following steps can be added: storing residual values corresponding to all sampling angles to obtain a motion correction table; the motion correction table is used for correcting scanning data obtained after scanning a load.
The embodiment of the invention obtains the scanning data generated by scanning the die body; determining actual centroid coordinates of the die body under different sampling angles according to the scanning data; and determining the vibration information of the scanning bed bearing the die body according to the actual mass center coordinates. According to the technical scheme, the vibration information of the scanning bed in the medical imaging equipment is determined based on the scanning data generated by the medical imaging equipment scanning the mould body, other hardware equipment does not need to be additionally introduced for auxiliary detection of the vibration information, and the cost of manpower and material resources is reduced; meanwhile, due to the fact that introduction of hardware equipment and migration of a software method corresponding to the vibration information are not needed, error sources and error transmission are reduced, and the measurement accuracy of the vibration information is improved.
It can be understood that, since there may be a difference in the positions of the centroids corresponding to different cross sections when the model is scanned, the condition definition for determining the vibration information of the scanning bed each time will be increased, and the vibration information determined at different times will also have a larger deviation. In an alternative embodiment of the invention, in order to reduce the condition restrictions during data processing and at the same time improve the accuracy and reproducibility of the determined vibration information, it is preferred to use a cylindrical phantom having axially symmetric properties. Illustratively, it may be a cylinder or a prism, etc.
Since the magnet aperture of the medical imaging apparatus is typically 500-700mm, in an alternative embodiment of the present invention, in order to further improve the accuracy of the determined vibration information of the scanning bed, it is preferable to select a phantom having a diameter at least two orders of magnitude smaller than the magnet aperture. Illustratively, a metal needle having a diameter of 3mm may be selected.
In another alternative embodiment of the present invention, in order to avoid the situation that too much scanning data is acquired, which results in unnecessary waste of resources, and at the same time, the situation that too little scanning data is acquired, which results in failure of determining the vibration information of the scanning bed, can be avoided, for example, the phantom may have a length of 30-100 mm. Preferably, the die body is 50mm in length.
Example two
Fig. 2 is a flowchart of a vibration information determining method in the second embodiment of the present invention, and the second embodiment of the present invention is optimized and improved based on the technical solutions of the above embodiments.
Further, the operation "acquiring scan data generated by scanning the phantom" is refined to "acquiring scan data generated by scanning the phantom at different times by the scanning bed"; correspondingly, the operation of determining the actual centroid coordinates of the die body at different sampling angles according to the scanning data is refined into the operation of determining the actual centroid coordinates of the die body at different sampling angles at different moments according to the scanning data acquired at all moments; correspondingly, the operation of determining the vibration information of the scanning bed bearing the phantom according to each actual barycentric coordinate is refined into the operation of determining the vibration information of the scanning bed bearing the phantom at each moment according to each actual barycentric coordinate, so that the vibration information of the scanning bed at different moments is determined.
Further, after the operation of determining vibration information of the scanning bed bearing the die body at each moment according to each actual centroid coordinate, additionally determining a time point when the vibration of the scanning bed is weakened according to the vibration information corresponding to each moment; and determining the starting scanning moment' when scanning the load according to the determined time point so as to perform intervention control on the use of the subsequent scanning bed through vibration information.
A vibration information determining method as shown in fig. 2 includes:
s210, acquiring scanning data generated when the phantom is scanned by the scanning bed at different moments.
The different time can be understood as the initial scanning time when the mold body carried by the scanning bed is repeatedly axially scanned after the scanning bed is moved to the set position.
And S220, respectively determining the actual centroid coordinates of the die body at different sampling angles at each moment according to the scanning data acquired at each moment.
Acquiring one moment as the current moment, processing the scanning data under different sampling angles by adopting at least one of weight method, Gaussian fitting method and other methods according to the scanning data corresponding to any axial section of the selected die body at the current moment, and acquiring the actual centroid coordinate under each sampling angle at the current moment; and re-acquiring another moment as the current moment, and determining the actual centroid coordinate until the actual centroid coordinate of the die body at different sampling angles at each moment is determined.
Optionally, in order to improve the accuracy of the obtained actual centroid coordinate, the actual centroid coordinate of the die body at different angles may be respectively determined for the scan data corresponding to the plurality of axial sections; and averaging the actual centroid coordinates under the same sampling angle to obtain the final actual centroid coordinates.
And S230, respectively determining the vibration information of the scanning bed bearing the phantom at each moment according to each actual centroid coordinate.
S240, determining the time point of the weakening of the vibration of the scanning bed according to the vibration information corresponding to each moment.
Because the vibration condition of the scanning bed is gradually stable along with the time after the scanning bed is fixed, the time point of the vibration attenuation of the scanning bed is determined according to the vibration information when the scanning bed is repeatedly scanned.
Optionally, determining a time point when the vibration of the scanning bed is weakened may be comparing the vibration information corresponding to different times with a preset vibration threshold; and if the current time and the vibration information in the set time period after the current time are less than the preset vibration threshold value, determining the current time as the time point when the vibration of the scanning bed is weakened. Wherein the preset shock threshold and/or the set time period are set by a technician as required or empirical.
Or alternatively, the time point of the vibration attenuation of the scanning bed is determined, and the vibration information of each adjacent moment can be compared; and if the change frequency of the difference value of the vibration information at each adjacent moment is smaller than the set frequency threshold, determining one of the adjacent moments corresponding to the moment smaller than the set frequency threshold as a time point when the vibration of the scanning bed is weakened. Wherein the set frequency threshold is set by a technician as needed or as a function of empirical values.
And S250, determining the initial scanning time when the load is scanned according to the determined time point.
Because the vibration of the scanning bed corresponding to the determined time point is weakened, the vibration information of the scanning bed tends to be stable after the determined time point, and therefore when the scanning bed is adopted to carry out data scanning by adopting the load carried by the scanning bed, the corresponding time point after the scanning bed is moved to the set position can be used as the initial scanning moment; or directly scanning the load after the scanning bed moves to a set position to obtain initial scanning data; removing data before the initial scanning moment in the initial scanning data to obtain target scanning data; wherein the target scan data is used to reconstruct the image.
According to the embodiment of the invention, the die body is repeatedly axially scanned after the scanning bed is fixed at the set position, the vibration information of the scanning bed bearing the die body at different axial scanning moments is determined according to scanning data obtained after axial scanning, the time point of weakening vibration of the scanning bed is determined according to the vibration information corresponding to each moment, and then the initial scanning moment when the load is scanned is determined. According to the technical scheme, the scanning time of the load borne by the scanning bed or the selection condition of the scanning data of the load borne by the scanning bed is indicated through the vibration conditions of the scanning bed at different fixed moments, so that the vibration information is effectively utilized, and meanwhile, the motion artifacts in the reconstructed image obtained after the scanning data are reconstructed are reduced.
On the basis of the technical solutions of the above embodiments, in order to reduce a measurement error introduced due to non-uniform response of a part of detector array elements in a detector array, so that a scanning background of scanning data is uniform and approximately zero, before determining actual centroid coordinates of a phantom at different sampling angles according to the scanning data of the phantom, the scanning data may be corrected according to a pre-stored data correction table to update the scanning data. The data correction table includes an air correction table, a bad channel correction table, and the like.
EXAMPLE III
Fig. 3A is a flowchart of a vibration information determining method in a third embodiment of the present invention, which provides a preferred implementation manner.
Fig. 3A shows a vibration information determining method applied to a CT apparatus, including:
s301, performing axial scanning on the metal needle placed on the scanning bed to obtain scanning data.
Wherein the diameter of the metal needle is about 3mm, the length is about 50mm, and the metal needle is approximately cylindrical. The metal needle is placed approximately along the rotational axis of the scanning aperture of the CT device. Because the border that closes up the scanning aperture sets up the metal needle, the fitting result when subsequently carrying out the curve fit is more accurate, consequently in order to guarantee measurement accuracy, preferably places the border that closes up the scanning aperture with the metal needle.
S302, preprocessing the scanning data to reduce background noise.
Wherein, the preprocessing at least comprises the step of carrying out air correction on the scanning data by adopting an air correction table; the preprocessing includes at least correcting scan data formed in response to non-uniform channels in the detector array using a bad channel correction table. See fig. 3B for a graphical representation of the scan data of the metal needle, where the horizontal axis is the sampling angle and the vertical axis is the detector channel.
S303, calculating the actual barycenter coordinates of the metal needle at different sampling angles according to the scanning data of any axial section of the metal needle, and obtaining an actual barycenter curve.
The actual centroid coordinates can be calculated by, but not limited to, weight method, gaussian fitting method, and the like. See the actual centroid coordinate curve shown in fig. 3C, where the horizontal axis is the sampling angle and the vertical axis is the actual centroid coordinate.
And S304, fitting according to the actual centroid curve to obtain a fitting curve.
Fitting the actual centroid curve by adopting the following formula to obtain a fitting curve:
wherein,
is the center of mass of the longitudinal axis, θjIs the sampling angle of the horizontal axis, theta0Is the offset angle R of the metal needle relative to the central axis of the CT deviceSDDDistance of bulb to detector, RPINIs the distance from the metal needle to the center of rotation, C is a constant, PcIs a constant. Wherein, theta0、RSDD/RPINC and PcCan be derived by curve fitting.
S305, calculating the difference between the theoretical centroid coordinate corresponding to different sampling angles in the fitting curve and the corresponding actual centroid coordinate to obtain a residual error curve.
When the scanning bed shakes less, the residual curve shows a completely disordered phenomenon. When the scanning bed shakes greatly, the residual curve can show sine-like fluctuation. Wherein fig. 3D and 3E show schematic diagrams of residual curves for small and large couch oscillations, respectively.
And S306, calculating the maximum peak value in the residual error curve, and multiplying the maximum peak value by a set constant to obtain the vibration amplitude.
Wherein the set constant depends on the distance SDD between the bulb and the detector, the distance SIN from the bulb to the rotation center, and the size L of the detector in the CT device. If the measure of the vibration amplitude is N, the constant is set to (N × L × SID × SDD).
Example four
Fig. 4 is a structural diagram of a vibration information determination apparatus according to a fourth embodiment of the present invention, which is applied to a case where vibration information of a scanning bed included in a medical imaging device is detected before a subject is detected by the medical imaging device. The device is realized by software and/or hardware and is specifically configured in the medical imaging equipment. The medical imaging device may be a Computed Tomography (CT) device.
A vibration information determination apparatus as shown in fig. 4 includes a scan data acquisition module 410, an actual centroid coordinate determination module 420, and a vibration information determination module 430.
The scanning data acquiring module 410 is configured to acquire scanning data generated by scanning a phantom;
the actual centroid coordinate determination module 420 is configured to determine actual centroid coordinates of the phantom at different sampling angles according to the scanning data;
and the vibration information determining module 430 is configured to determine vibration information of the scanning bed bearing the phantom according to each of the actual coordinates of the center of mass.
In the embodiment of the invention, the scanning data generated by scanning the die body is acquired by the scanning data acquisition module; determining the actual centroid coordinates of the die body under different sampling angles through an actual centroid coordinate determination module according to the scanning data; and determining the vibration information of the scanning bed bearing the die body according to the actual mass center coordinates through the vibration information determination module. According to the technical scheme, the vibration information of the scanning bed in the medical imaging equipment is determined based on the scanning data generated by the medical imaging equipment scanning the mould body, other hardware equipment does not need to be additionally introduced for auxiliary detection of the vibration information, and the cost of manpower and material resources is reduced; meanwhile, due to the fact that introduction of hardware equipment and migration of a software method corresponding to the vibration information are not needed, error sources and error transmission are reduced, and the measurement accuracy of the vibration information is improved.
Further, the vibration information determination module 430 includes:
the theoretical centroid coordinate determination unit is used for fitting a centroid curve according to each actual centroid coordinate and obtaining each theoretical centroid coordinate corresponding to the centroid curve;
and the vibration information determining unit is used for determining the vibration information of the scanning bed bearing the phantom according to each theoretical barycentric coordinate and each actual barycentric coordinate.
Further, the vibration information determination unit is specifically configured to:
determining a residual value corresponding to each sampling angle according to the theoretical centroid coordinate and the actual centroid coordinate under the same sampling angle;
and acquiring the maximum peak value of each residual value, and determining the vibration information of the scanning bed bearing the die body according to the maximum peak value.
Further, the vibration information determining unit is further configured to, after performing the following operations to determine a residual value corresponding to each sampling angle according to the theoretical centroid coordinate and the actual centroid coordinate at the same sampling angle:
storing residual values corresponding to all sampling angles to obtain a motion correction table;
the motion correction table is used for correcting scanning data obtained after scanning a load.
Further, the scan data obtaining module 410 is specifically configured to:
acquiring scanning data generated by the scanning bed scanning the die body at different moments;
accordingly, the actual centroid coordinates determination module 420 is specifically configured to:
respectively determining the actual centroid coordinates of the die body at different sampling angles at each moment according to the scanning data acquired at each moment;
correspondingly, the vibration information determining module 430 is specifically configured to:
and respectively determining the vibration information of the scanning bed bearing the die body at each moment according to each actual mass center coordinate.
Further, the device also comprises a vibration information using module, which is specifically used for:
after vibration information of the scanning bed bearing the die body at each moment is respectively determined according to each actual centroid coordinate, determining a time point when vibration of the scanning bed is weakened according to the vibration information corresponding to each moment;
and determining the initial scanning moment when scanning the load according to the determined time point.
Further, the apparatus further includes a scan data update module, specifically configured to:
before determining the actual centroid coordinates of the phantom at different sampling angles according to the scanning data of the phantom, correcting the scanning data according to a pre-stored data correction table to update the scanning data.
Further, the die body is a metal die body.
Further, the die body is columnar.
The vibration information determining device can execute the vibration information determining method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of executing the vibration information determining method.
EXAMPLE five
Fig. 5 is a schematic structural diagram of a medical imaging apparatus according to a fifth embodiment of the present invention, the medical imaging apparatus including:
a scan bed 510 for carrying a phantom.
A scanning frame 520 for scanning the phantom to generate scanning data;
the medical imaging device further comprises:
one or more processors 530;
a storage 540 for storing one or more programs.
In fig. 5, a processor 530 is taken as an example, the processor 530 in the medical imaging system is respectively connected to the scanning bed 510 and the scanning frame 520 by a bus or other means, and the processor 530 and the storage device 540 are also connected by a bus or other means. Fig. 5 illustrates an example of connection via a bus.
In this embodiment, the processor 530 of the medical imaging device may obtain scan data generated by the scanning phantom of the gantry 520; the device is also used for determining the actual centroid coordinates of the die body under different sampling angles according to the scanning data; and the vibration information of the scanning bed bearing the phantom is determined according to the actual mass center coordinates.
The storage device 540 of the medical imaging apparatus is used as a computer-readable storage medium for storing one or more programs, which may be software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the vibration information determination method in the embodiment of the present invention (for example, the scan data acquisition module 410, the actual centroid coordinate determination module 420, and the vibration information determination module 430 shown in fig. 4). The processor 530 executes various functional applications and data processing of the medical imaging apparatus by executing software programs, instructions and modules stored in the storage device 540, so as to implement the vibration information determination method in the above method embodiment.
The storage device 540 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data or the like (scan data, actual centroid coordinates, vibration information, and the like as in the above-described embodiments). In addition, the storage 540 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, storage 540 may further include memory located remotely from processor 530, which may be connected to a server over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
EXAMPLE six
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a vibration information determination apparatus, implements a vibration information determination method provided in the embodiments of the present invention, and the method includes: acquiring scanning data generated by scanning a die body; determining actual centroid coordinates of the die body under different sampling angles according to the scanning data; and determining vibration information of the scanning bed bearing the die body according to each actual mass center coordinate.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A vibration information determination method, comprising:
acquiring scanning data generated by scanning a die body;
determining actual centroid coordinates of the die body under different sampling angles according to the scanning data;
determining vibration information of a scanning bed bearing the die body according to each actual centroid coordinate;
the vibration information of the scanning bed comprises vibration information determined based on the difference value between each actual barycentric coordinate and a theoretical barycentric coordinate corresponding to each actual barycentric coordinate, and/or vibration information determined based on the fluctuation degree corresponding to each actual barycentric coordinate;
the vibration information determined based on the difference value between the actual centroid coordinates and the theoretical centroid coordinates respectively corresponding to the actual centroid coordinates comprises vibration information obtained by multiplying the maximum peak-to-peak value of the residual value between the actual centroid coordinates and the theoretical centroid coordinates respectively corresponding to the actual centroid coordinates by a preset numerical value.
2. The method of claim 1, wherein determining, from each of the actual centroid coordinates, vibration information for a scan bed bearing the phantom comprises:
fitting a centroid curve according to each actual centroid coordinate, and obtaining each theoretical centroid coordinate corresponding to the centroid curve;
and determining the vibration information of the scanning bed bearing the die body according to each theoretical centroid coordinate and each actual centroid coordinate.
3. The method of claim 2, wherein determining, from each theoretical centroid coordinate and each actual centroid coordinate, vibration information for a scan bed bearing the phantom comprises:
determining a residual value corresponding to each sampling angle according to the theoretical centroid coordinate and the actual centroid coordinate under the same sampling angle;
and acquiring the maximum peak value of each residual value, and determining the vibration information of the scanning bed bearing the die body according to the maximum peak value.
4. The method of claim 3, after determining the residual error value corresponding to each sampling angle according to the theoretical centroid coordinate and the actual centroid coordinate at the same sampling angle, further comprising:
storing residual values corresponding to all sampling angles to obtain a motion correction table;
the motion correction table is used for correcting scanning data obtained after scanning a load.
5. The method of any of claims 1-4, wherein acquiring scan data generated from scanning the phantom comprises:
acquiring scanning data generated by the scanning bed scanning the die body at different moments;
correspondingly, according to the scanning data, determining the actual centroid coordinates of the phantom at different sampling angles includes:
respectively determining the actual centroid coordinates of the die body at different sampling angles at each moment according to the scanning data acquired at each moment;
correspondingly, according to each of the actual centroid coordinates, determining vibration information of the scanning bed bearing the phantom, including:
and respectively determining the vibration information of the scanning bed bearing the die body at each moment according to each actual mass center coordinate.
6. The method of claim 5, further comprising, after determining, from each of the actual centroid coordinates, vibration information for a scan bed bearing the phantom at each time, respectively:
determining the time point of weakening the vibration of the scanning bed according to the vibration information corresponding to each moment;
and determining the initial scanning moment when scanning the load according to the determined time point.
7. The method of any of claims 1-4, wherein the mold body is a metal mold body.
8. A vibration information determination apparatus, characterized by comprising:
the scanning data acquisition module is used for acquiring scanning data generated by scanning the die body;
the actual centroid coordinate determination module is used for determining actual centroid coordinates of the die body under different sampling angles according to the scanning data;
the vibration information determining module is used for determining vibration information of the scanning bed bearing the die body according to each actual mass center coordinate;
the vibration information of the scanning bed comprises vibration information determined based on the difference value between each actual barycentric coordinate and a theoretical barycentric coordinate corresponding to each actual barycentric coordinate, and/or vibration information determined based on the fluctuation degree corresponding to each actual barycentric coordinate;
the vibration information determined based on the difference value between the actual centroid coordinates and the theoretical centroid coordinates respectively corresponding to the actual centroid coordinates comprises vibration information obtained by multiplying the maximum peak-to-peak value of the residual value between the actual centroid coordinates and the theoretical centroid coordinates respectively corresponding to the actual centroid coordinates by a preset numerical value.
9. A medical imaging device, including scanning bed and scanning frame, its characterized in that includes:
one or more processors;
a memory for storing one or more programs;
when executed by the one or more processors, cause the one or more processors to implement a method of vibration information determination as claimed in any one of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a vibration information determination method according to any one of claims 1 to 7.
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