CN110840477B - Scanning method, scanning device, computer apparatus, and computer-readable storage medium - Google Patents
Scanning method, scanning device, computer apparatus, and computer-readable storage medium Download PDFInfo
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- CN110840477B CN110840477B CN201911164682.9A CN201911164682A CN110840477B CN 110840477 B CN110840477 B CN 110840477B CN 201911164682 A CN201911164682 A CN 201911164682A CN 110840477 B CN110840477 B CN 110840477B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/032—Transmission computed tomography [CT]
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/40—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for generating radiation specially adapted for radiation diagnosis
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
Abstract
The application relates to a scanning method, a device, a computer apparatus and a computer readable storage medium, wherein the scanning method comprises adjusting a single field of view maintenance time of a scanning system and/or a high frequency ripple period of a high voltage generator so that the single field of view maintenance time is an integer multiple of the high frequency ripple period; and scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system. The scanning method provided by the application ensures the consistency of the high-frequency ripple waveforms in different single fields by controlling the single field maintenance time to be an integral multiple of the high-frequency ripple period, so that the requirement of a CT system on the voltage high-frequency ripple can be reduced on the premise of not influencing the imaging effect of the system, and the power density of a high-voltage generator is improved.
Description
Technical Field
The present invention relates to the field of medical treatment, and in particular, to a scanning method, apparatus, computer device, and computer-readable storage medium.
Background
In the imaging process of the CT system, the high-voltage generator drives the bulb tube to generate X-rays with certain intensity, the X-rays penetrate through a scanned object and are attenuated, and the attenuated X-rays are collected by the detector. Each scan of a CT system is divided into hundreds to thousands of fields of view, each field of view corresponding to a certain scan angle. The system integrates the signals acquired by the detectors in each view to obtain scanning data of corresponding angles, and then images the scanned object by methods such as filtering back projection or iterative reconstruction. The intensity of X-ray emitted from the bulb tube is related to output voltage (kV) and current (mA) when the high-voltage generator drives the bulb tube to work, and high-frequency ripple waves of the output voltage can influence the stability of the intensity of X-ray emitted, so that the imaging of the system is influenced.
Disclosure of Invention
The application provides a scanning method, a scanning device, computer equipment and a computer readable storage medium, which can reduce the influence of high-frequency ripple on CT system imaging, thereby reducing the requirement of the CT system on the high-frequency ripple.
A scanning method, the method comprising:
adjusting the single-view maintaining time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period;
and scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
In an embodiment, the adjusting the single field of view maintenance time of the scanning system and/or the high frequency ripple period of the high voltage generator comprises:
acquiring single-view maintenance time of the scanning system;
and adjusting the switching frequency of the high-voltage generator according to the single-view maintaining time so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In an embodiment, the adjusting the single field of view maintenance time of the scanning system and/or the high frequency ripple period of the high voltage generator comprises:
acquiring a switching period signal of the high-voltage generator, and acquiring a high-frequency ripple period of the high-voltage generator according to the switching period signal;
and adjusting the single-view maintaining time of the scanning system according to the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In an embodiment, said adjusting the single field of view maintenance time of the scanning system according to the high frequency ripple period of the high voltage generator comprises:
and adjusting the rotating speed of the scanning system rack according to the high-frequency ripple period so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In an embodiment, said adjusting the single field of view maintenance time of the scanning system according to the high frequency ripple period of the high voltage generator comprises:
and adjusting the total field number of each scanning circle of the scanning system according to the high-frequency ripple period so that the single-field maintaining time is an integral multiple of the high-frequency ripple period.
In an embodiment, the method further comprises:
decoupling the relation between the modulation mode of the high-voltage generator and the switching frequency so as to enable the modulation mode of the high-voltage generator and the switching frequency to be mutually independent.
In one embodiment, the modulation mode of the high voltage generator includes pulse amplitude modulation and pulse width modulation.
A scanning device, the device comprising:
the adjusting module is used for adjusting the single-view maintaining time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period;
and the scanning module is used for scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method described above when the processor executes the computer program.
A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the above method.
The scanning method, the scanning device, the computer equipment and the computer readable storage medium provided by the embodiment of the application comprise the steps of adjusting the single-view maintaining time of a scanning system and/or the high-frequency ripple period of a high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period; and scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system. The scanning method provided by the application ensures the consistency of the high-frequency ripple waveforms in different single fields by controlling the single field maintenance time to be an integral multiple of the high-frequency ripple period, so that the requirement of a CT system on the voltage high-frequency ripple can be reduced on the premise of not influencing the imaging effect of the system, and the power density of a high-voltage generator is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a scanning method according to an embodiment;
FIG. 2 is a schematic diagram of providing a maintenance time for each single field of view during a scan process according to an embodiment;
FIG. 3 is a schematic diagram of high frequency ripple in different single fields of view provided by an embodiment;
FIG. 4 is a block diagram of a scanning device in one embodiment;
fig. 5 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
In order to facilitate understanding of the present application, the following detailed description of the specific embodiments of the present application will be described in connection with the accompanying drawings, so that the foregoing objects, features, and advantages of the present application will be more readily understood. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, the preferred embodiments of which are shown in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. This application is intended to be limited to the details of the particular embodiments disclosed herein since it is to be understood that modifications may be made by those skilled in the art without departing from the spirit of the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise. In the description of the present application, the meaning of "several" means at least one, such as one, two, etc., unless explicitly defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
A computed tomography apparatus (CT) generally comprises a gantry, a scan table and a console for operation by a physician. One side of the frame is provided with a bulb, and one side opposite to the bulb is provided with a detector. The console is computer equipment for controlling the bulb tube and the detector to scan, and the computer equipment is also used for receiving the data acquired by the detector, processing and reconstructing the data, and finally forming a CT image. When the CT is used for scanning, a patient lies on the scanning bed, the scanning bed sends the patient into the aperture of the frame, the bulb tube arranged on the frame emits X rays, the X rays penetrate through the patient to be received by the detector to form data, the data are transmitted to the computer equipment, and the computer equipment performs preliminary processing and image reconstruction on the data to obtain CT images.
Fig. 1 is a flowchart of a scanning method according to an embodiment, as shown in fig. 1, the scanning method includes steps 110 and 120, where:
step 110, adjusting the single-view maintenance time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintenance time is an integer multiple of the high-frequency ripple period.
The scanning system comprises a frame, a scanning frame, a bulb tube fixed on the scanning frame, a high-voltage generator and a detector, and the scanning frame is rotatably arranged on the frame. The high-voltage generator drives the bulb tube to generate X-rays with certain intensity, the X-rays are attenuated after penetrating through a scanning object, the attenuated X-rays are collected by the detector, and imaging is carried out according to collected data. Each circle of scanning range of the scanning system is divided into hundreds to thousands of fields of view, each field of view corresponds to a certain scanning angle, scanning is carried out for a certain time in each field of view, and data obtained by scanning are collected by the detector. And integrating the signals acquired by the detectors in each view field to obtain scanning data of corresponding scanning angles, and reconstructing the scanning data by methods such as filtering back projection or iterative reconstruction to obtain a reconstructed image. With the rotation of the scanning system frame, the n-1 th, n-th and n+1 th single-view maintaining time of a certain circle of scanning is respectively delta tn-1, delta tn and delta tn+1, as shown in fig. 2. Since the accuracy and stability of the gantry rotational angular velocity can be made very high, all of Δtn-1, Δtn, Δtn+1 in fig. 2 are approximately equal to the expected value Δt, and further considering the inertia of the mechanical rotation, the difference in the adjacent two single field of view maintenance times can be ignored.
Conventionally, there is no correlation between the high-frequency ripple period and the single-view maintenance time, and the high-frequency ripple difference in different single-views may be large, resulting in unstable ripple integral values in different single-view times, thereby affecting the stability of the emitted X-ray intensity. Referring to fig. 3, high frequency ripple uniformity within the first and second single VIEW1 and 2 is poor, and an integrated value of the high frequency ripple within the first and second single VIEW1 and 2 may be unstable. In order to make the unstable integral value not affect the imaging of the system, the absolute value of the integral value must be small enough to control the fluctuation of the X-ray intensity in different single fields of view not to affect the imaging of the scanning system, and the requirement on high-frequency ripple waves is high.
The single-view maintaining time of the scanning system and/or the high-frequency ripple period of the high-voltage generator are/is adjusted, so that the single-view maintaining time is an integral multiple of the high-frequency ripple period, and the single-view maintaining time can be 1 time, 2 times, 3 times or the like of the high-frequency ripple period. Specifically, the high-frequency ripple period of the high-voltage generator can be controlled to be fixed, and the single-view maintenance time of the scanning system is independently adjusted, so that the single-view maintenance time always keeps an integral multiple relation with the high-frequency ripple period; or, controlling the single-view maintenance time of the scanning system to be constant, and independently adjusting the high-frequency ripple period of the high-voltage generator to ensure that the high-frequency ripple period of the high-voltage generator maintains an integral multiple relation with the single-view maintenance time; or simultaneously adjusting the single-view maintaining time and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period. The specific adjustment method is not limited in this embodiment, as long as the single-view maintenance time is ensured to be an integer multiple of the high-frequency ripple period.
It should be noted that, for the same scan, each single field of view maintenance time is the same. For different times of scanning, the single-view maintaining time can be different, so long as the single-view maintaining time is ensured to be different integer multiples of the high-frequency ripple period in the scanning process. For example, during a first scan, the single field of view is maintained for 2 times the high frequency ripple period of the high voltage generator, and during a second scan, the single field of view is maintained for 3 times the high frequency ripple period of the high voltage generator.
Step 120, scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
The scanning method provided by the embodiment of the application comprises the steps of adjusting the single-view maintaining time of a scanning system and/or the high-frequency ripple period of a high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period; and scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system. According to the scanning method, the single-view maintaining time is controlled to be the integral multiple of the high-frequency ripple period, so that high-frequency ripples in each single-view can be kept to be good in consistency, further, ripple integral values in different single-view time are stable, and even if a high-voltage generator outputs relatively high-frequency ripples, imaging quality is not affected. The requirements of the CT system on the voltage high-frequency ripple waves can be reduced on the premise of not affecting the imaging effect of the system, and the power density of the high-voltage generator is improved.
In one embodiment, adjusting the single field of view maintenance time of the scanning system and/or the high frequency ripple period of the high voltage generator comprises:
a single field of view maintenance time of the scanning system is acquired.
Since the single field of view maintenance time of the scanning system is not fixed but adjustable, the high voltage generator needs the scanning system to inform the currently used single field of view maintenance time in advance.
The switching frequency of the high voltage generator is adjusted according to the single field of view maintaining time so that the single field of view maintaining time is an integer multiple of the high frequency ripple period.
The switching frequency refers to the switching frequency of an inversion switch in the high-voltage generator, for the traditional high-voltage generator, the high-frequency ripple cycle output by the high-voltage generator is 1 or 0.5 inversion switching cycles, so that the high-frequency ripple cycle is one or two times of the switching frequency, which is determined by the power electronic converter itself, if the inversion of the high-voltage generator is symmetrically controlled, the output ripple cycle of the high-voltage generator is theoretically two times of the switching cycle, no matter what control method is, the high-frequency ripple waveforms output in different switching cycles are always the same, and therefore, the period of the high-frequency ripple can be adjusted by adjusting the inversion switching frequency. In this embodiment, the relation between the high-frequency ripple period output by the high-voltage generator and the switching frequency of the high-voltage generator is combined, and the high-frequency ripple period is adjusted by adjusting the switching frequency of the high-voltage generator, so that the single-field maintenance time is an integer multiple of the high-frequency ripple period.
In one embodiment, adjusting the single field of view maintenance time of the scanning system and/or the high frequency ripple period of the high voltage generator comprises:
acquiring a switching period signal of the high-voltage generator, and acquiring a high-frequency ripple period of the high-voltage generator according to the switching period signal;
and adjusting the single-view maintaining time of the scanning system according to the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
The switching period signal of the high-voltage generator has a corresponding relation with the high-frequency ripple period of the high-voltage generator, and the high-frequency ripple period of the high-voltage generator can be obtained through calculation after the switching period signal of the high-voltage generator is obtained for different high-voltage generators, wherein the high-frequency ripple period is an integral multiple of the switching period or an integral multiple of a half switching period of the high-voltage generator. After the high-frequency ripple period is obtained, only the single-view maintaining time of the scanning system is adjusted, so that each single-view maintaining time is an integral multiple of the high-frequency ripple period.
Specifically, the rotational speed of the scanning system gantry may be adjusted according to the high frequency ripple period such that the single field of view maintenance time is an integer multiple of the high frequency ripple period. It will be appreciated that the faster the rotational speed of the gantry, the shorter the single field of view maintenance time, and the slower the rotational speed of the gantry, the longer the single field of view maintenance time. The single field of view maintenance time can be an integer multiple of the high frequency ripple period by adjusting the rotational speed of the scanning system gantry to the target rotational speed such that scanning is performed at the target rotational speed.
In one embodiment, the total field of view per scan of the scanning system is adjusted according to the high frequency ripple period such that the single field of view duration is an integer multiple of the high frequency ripple period.
If the rotation speed of the frame is fixed, the more the total field of view is per scanning, the shorter the single field of view maintaining time is, the fewer the total field of view per scanning is, and the longer the single field of view maintaining time is. In this embodiment, the total field number of each scanning turn of the scanning system is adjusted, so that the single-field maintenance time can be controlled to be an integer multiple of the high-frequency ripple period.
It should be noted that the single field of view maintenance time, the total field of view per scan, and the gantry rotational speed all need to meet the imaging requirements of the system.
In an embodiment, the scanning method further comprises:
the association of the modulation mode of the high-voltage generator and the switching frequency is decoupled, so that the modulation mode of the high-voltage generator and the switching frequency are mutually independent.
In one embodiment, the modulation scheme of the high voltage generator includes pulse amplitude modulation and pulse width modulation,
the decoupling is to adopt no frequency conversion modulation modes, such as pulse amplitude modulation or pulse width modulation, and the modulation modes can adjust the output of the high-voltage generator according to the requirement of a scanning system on the premise of not frequency conversion. If the modulation mode of the high voltage generator causes the switching frequency to be changed continuously, the high ripple period is also changed continuously, so that the integral multiple relation between the single-view maintaining time and the high-frequency ripple period cannot be ensured. According to the embodiment, the modulation mode of the high-voltage generator and the switching frequency can be mutually independent through the association of the modulation mode of the decoupling high-voltage generator and the switching frequency, so that the high-ripple period can be prevented from being influenced by other aspects in the scanning process, and the integral multiple relation between the single-field maintenance time and the high-frequency ripple period is ensured.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 1 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of other steps or sub-steps of other steps.
In one embodiment, as shown in fig. 4, there is provided a scanning apparatus comprising: an adjustment module 410 and a scanning module 420, wherein:
the adjustment module 410 is configured to adjust the single-view maintenance time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintenance time is an integer multiple of the high-frequency ripple period.
The scanning module 420 is configured to scan the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
In one embodiment, the adjustment module 410 is configured to obtain a single field of view maintenance time of the scanning system;
the switching frequency of the high voltage generator is adjusted according to the single field of view maintaining time so that the single field of view maintaining time is an integer multiple of the high frequency ripple period.
In one embodiment, the adjusting module 410 is configured to obtain a switching period signal of the high voltage generator, and obtain a high frequency ripple period of the high voltage generator according to the switching period signal;
and adjusting the single-view maintaining time of the scanning system according to the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the adjustment module 410 is configured to adjust the rotation speed of the scanning system frame according to the high-frequency ripple period, so that the single-view maintenance time is an integer multiple of the high-frequency ripple period.
In one embodiment, the adjustment module 410 is configured to adjust the total field of view of the scanning system per scan cycle according to the high frequency ripple period, so that the single field of view maintaining time is an integer multiple of the high frequency ripple period.
In an embodiment, the scanning device further includes a decoupling module (not shown in the figure) for decoupling the association of the modulation mode of the high voltage generator with the switching frequency, so that the modulation mode of the high voltage generator is independent of the switching frequency.
In one embodiment, the modulation scheme of the high voltage generator includes pulse amplitude modulation and pulse width modulation.
The scanning device provided in the embodiment of the application includes an adjustment module 410 and a scanning module 420, where the adjustment module 410 is configured to adjust a single-view maintenance time of the scanning system and/or a high-frequency ripple period of the high-voltage generator, so that the single-view maintenance time is an integer multiple of the high-frequency ripple period; the scanning module 420 is configured to scan the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system. The scanning device provided by the application ensures the consistency of high-frequency ripple waveforms in different single fields by controlling the single-field maintenance time to be the integral multiple of the high-frequency ripple period, so that the requirement of a CT system on voltage high-frequency ripple can be reduced on the premise of not influencing the imaging effect of the system, and the power density of a high-voltage generator is improved.
For specific limitations of the scanning device, reference may be made to the above limitations of the scanning method, and no further description is given here. The various modules in the scanning device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules described above may be embedded in hardware or separate from a processor in a computer device, or may be stored in software in a memory in the computer device so that the processor invokes the operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 5. The computer device includes a processor, a memory, a network interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a scanning method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in fig. 5 is merely a block diagram of some of the structures associated with the present application and is not limiting of the computer device to which the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided comprising a memory and a processor, the memory having stored therein a computer program, the processor when executing the computer program performing the steps of:
adjusting the single-view maintaining time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period;
and scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring single-view maintenance time of the scanning system;
and adjusting the switching frequency of the high-voltage generator according to the single-view maintaining time so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring a switching period signal of the high-voltage generator, and acquiring a high-frequency ripple period of the high-voltage generator according to the switching period signal;
and adjusting the single-view maintaining time of the scanning system according to the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
and adjusting the rotating speed of the scanning system rack according to the high-frequency ripple period so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
and adjusting the total field number of each scanning circle of the scanning system according to the high-frequency ripple period so that the single-field maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
decoupling the relation between the modulation mode of the high-voltage generator and the switching frequency so as to enable the modulation mode of the high-voltage generator and the switching frequency to be mutually independent.
In one embodiment, the modulation mode of the high voltage generator includes pulse amplitude modulation and pulse width modulation.
In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, performs the steps of:
adjusting the single-view maintaining time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period;
and scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring single-view maintenance time of the scanning system;
and adjusting the switching frequency of the high-voltage generator according to the single-view maintaining time so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
acquiring a switching period signal of the high-voltage generator, and acquiring a high-frequency ripple period of the high-voltage generator according to the switching period signal;
and adjusting the single-view maintaining time of the scanning system according to the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
and adjusting the rotating speed of the scanning system rack according to the high-frequency ripple period so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
and adjusting the total field number of each scanning circle of the scanning system according to the high-frequency ripple period so that the single-field maintaining time is an integral multiple of the high-frequency ripple period.
In one embodiment, the processor when executing the computer program further performs the steps of:
decoupling the relation between the modulation mode of the high-voltage generator and the switching frequency so as to enable the modulation mode of the high-voltage generator and the switching frequency to be mutually independent.
In one embodiment, the modulation mode of the high voltage generator includes pulse amplitude modulation and pulse width modulation.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. A scanning method, the method comprising:
adjusting the single-view maintaining time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period, and the single-view maintaining time is the single-view scanning time;
and scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
2. The method of claim 1, wherein adjusting a single field of view maintenance time of the scanning system and/or a high frequency ripple period of the high voltage generator comprises:
acquiring single-view maintenance time of the scanning system;
and adjusting the switching frequency of the high-voltage generator according to the single-view maintaining time so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
3. The method of claim 1, wherein adjusting a single field of view maintenance time of the scanning system and/or a high frequency ripple period of the high voltage generator comprises:
acquiring a switching period signal of the high-voltage generator, and acquiring a high-frequency ripple period of the high-voltage generator according to the switching period signal;
and adjusting the single-view maintaining time of the scanning system according to the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
4. The method of claim 3, wherein said adjusting the single field of view maintenance time of the scanning system according to the high frequency ripple period of the high voltage generator comprises:
and adjusting the rotating speed of the scanning system rack according to the high-frequency ripple period so that the single-view maintaining time is an integral multiple of the high-frequency ripple period.
5. The method of claim 3, wherein said adjusting the single field of view maintenance time of the scanning system according to the high frequency ripple period of the high voltage generator comprises:
and adjusting the total field number of each scanning circle of the scanning system according to the high-frequency ripple period so that the single-field maintaining time is an integral multiple of the high-frequency ripple period.
6. The method according to claim 2, wherein the method further comprises:
decoupling the relation between the modulation mode of the high-voltage generator and the switching frequency so as to enable the modulation mode of the high-voltage generator and the switching frequency to be mutually independent.
7. The method of claim 6, wherein the step of providing the first layer comprises,
the modulation mode of the high-voltage generator comprises pulse amplitude modulation and pulse width modulation.
8. A scanning device, the device comprising:
the adjusting module is used for adjusting the single-view maintaining time of the scanning system and/or the high-frequency ripple period of the high-voltage generator so that the single-view maintaining time is an integral multiple of the high-frequency ripple period, and the single-view maintaining time is the single-view scanning time;
and the scanning module is used for scanning the object to be scanned according to the high-frequency ripple period of the high-voltage generator and the single-view maintenance time of the scanning system.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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