CN116019474A - Multi-source imaging device and method - Google Patents
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Abstract
The present disclosure provides a multi-source imaging apparatus and method, in which a first source portion is controlled to image a scanned object to obtain a first imaging result, then a target spatial region in the first imaging result is determined based on position selection information, then a region of interest is determined on a detector according to the target spatial region, finally a second source portion is controlled to image the scanned object according to the region of interest to obtain a second imaging result, the field of view of the second imaging result is smaller than that of the first imaging result, the resolution of the second imaging result is higher than that of the first imaging result, the first source part is used for carrying out large-field positioning imaging, the second source part is used for carrying out small-field high-definition imaging, the whole set of shooting process is completely free of positioning a scanning object, the problem of difficult positioning of the small-field imaging is effectively solved, the requirements of ultra-large field and ultra-high resolution are met, and the complexity of equipment is reduced.
Description
Technical Field
The present disclosure relates to the field of image processing technologies, and in particular, to a multi-source imaging apparatus and method.
Background
CBCT (Cone Beam Computer Tomography, cone beam CT) is a technique that emits X-rays around a scanned object while data acquisition is performed and a three-dimensional image is obtained by reconstruction. The CBCT technology has many application scenarios, for example, in the field of oral cavity, and can be used for imaging in various scenarios such as dental pulp disease, periodontal disease, orthodontic, oromaxillofacial surgery, and oral implantation.
The requirements for CBCT in various application scenarios are also different. Taking orthodontic as an example, the requirements for the field of view of CBCT imaging are high, for example, the longitudinal field of view may need to be up to 18cm or more in height. Taking dental pulp disease as an example, since it is necessary to observe a microstructure such as periodontal ligament and root canal, the resolution of CBCT imaging is required to be high, and for example, the voxel size may be required to be at a level of 100 μm or less, and the line pair number may be required to be at 25 line pairs/cm or more.
The current CBCT apparatus mainly has the following drawbacks:
1. because the imaging range of the small vision field is smaller, if a fixed small vision field area in the space is reconstructed by adopting a positioning mode, a user is required to move a part to be shot into the imaging area of the equipment during shooting, the process is troublesome and time-consuming, the problem of inaccurate positioning often occurs, and the target imaging area is difficult to quickly and accurately position; if the full detector field of view is used for imaging, the frame rate of the detector is difficult to increase although the full detector field of view does not need to be positioned, and the imaging quality is affected.
2. The CBCT equipment adopts a plurality of imaging systems, each imaging system corresponds to a set of detector source groups respectively, a plurality of detectors are arranged in the whole CBCT equipment, the imaging systems are mutually independent, each imaging system has an independent structure, and the CBCT equipment is complicated in structure, large in size and difficult to cooperate.
Disclosure of Invention
To address at least one of the above-mentioned technical problems, the present disclosure provides multi-source imaging devices and methods.
A first aspect of the present disclosure proposes a multi-source imaging device comprising: a detector; the first source part is arranged opposite to the detector and is configured to image a scanning object in cooperation with the detector to obtain a first imaging result; a target region determination module configured to determine a target spatial region based on position selection information, wherein the target spatial region is included in the first imaging result; a region of interest determination module configured to determine a region of interest on the detector as a function of the target spatial region; and a second source part arranged opposite to the detector and configured to image the scanning object according to the region of interest by matching with the detector to obtain a second imaging result, wherein the field of view of the second imaging result is smaller than that of the first imaging result, the resolution of the second imaging result is higher than that of the first imaging result, and the first source part and the second source part share the same detector.
According to one embodiment of the present disclosure, the radiation dose used for imaging by the first source unit is smaller than the radiation dose used for imaging by the second source unit, and the number of taken images imaged by the first source unit is smaller than the number of taken images imaged by the second source unit.
According to one embodiment of the present disclosure, the first source part includes a plurality of sources horizontally arranged or vertically arranged, and the second source part includes one source.
According to one embodiment of the present disclosure, the first and second source portions are horizontally arranged, and the imaging fields of view of the first and second source portions have overlapping portions in a horizontal direction.
According to one embodiment of the present disclosure, the apparatus further comprises: and the detector is arranged on one side of a rotating part of the rotating mechanism, and the first source part and the second source part are arranged on the other side of the rotating part.
According to one embodiment of the disclosure, the method for determining the target space region by the target region determining module based on the position selection information includes: acquiring position selection information; and determining a target space area according to the position selection information and the first imaging result.
According to one embodiment of the present disclosure, the method for acquiring the location selection information by the target area determining module includes: and receiving position selection information input by a user.
According to one embodiment of the disclosure, the method for determining the region of interest on the detector according to the target spatial region includes: determining a projection area of the target space area on the detector according to the imaging light paths of the target space area and the second source part; and determining a region of interest on the detector according to the projection region.
According to one embodiment of the disclosure, the method for determining the region of interest on the detector by the region of interest determination module according to the projection region includes: determining a plurality of projection areas on the detector in a scanning period according to a preset scanning angle and an imaging light path of the second source part; determining highest and lowest positions of the plurality of projection areas on the detector; and determining the width of the region of interest according to the highest position and the lowest position.
According to one embodiment of the present disclosure, the length of the region of interest is equal to the length of the data acquisition face of the detector.
According to one embodiment of the disclosure, the second source part is provided with a movable beam limiter, and the radiation range of the second source part is adjusted to be matched with the region of interest by the movable beam limiter when the second source part images the scanning object according to the region of interest.
A second aspect of the present disclosure proposes a multi-source imaging method applied to the multi-source imaging device according to any one of the above embodiments, the method comprising: imaging a scanning object through a first source part and a detector to obtain a first imaging result; determining a target space region based on the position selection information, wherein the target space region is contained in the first imaging result; determining a region of interest on the detector according to the target space region; and imaging the scanning object according to the region of interest through a second source part and the detector to obtain a second imaging result, wherein the field of view of the second imaging result is smaller than that of the first imaging result, and the resolution of the second imaging result is higher than that of the first imaging result.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.
Fig. 1 is a block diagram of a multi-source imaging device according to one embodiment of the present disclosure.
Fig. 2 is a schematic diagram of a structure of a multi-source imaging device in a three-dimensional view according to one embodiment of the present disclosure.
Fig. 3 is a schematic diagram of an imaging field of view of a first source section and a second source section in a top view according to one embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a multi-source imaging device performing a large field of view positioning imaging process according to one embodiment of the present disclosure.
Fig. 5 is a schematic diagram of a multi-source imaging device performing a small field high definition imaging process according to one embodiment of the present disclosure.
Fig. 6 is a schematic diagram of a second source portion ray range according to one embodiment of the present disclosure.
Fig. 7 is a schematic diagram of a multi-source imaging device employing a hardware implementation of a processing system according to one embodiment of the present disclosure.
Fig. 8 is a flow diagram of a multi-source imaging method according to one embodiment of the present disclosure.
Reference numerals:
100-detector;
200-a first source part, 210-a source, 220-a source;
300-a second source section, 310-a source;
400-a target area determination module;
500-a region of interest determination module;
a Z-axis of rotation;
s1-effective imaging range of the first source part, S2-target space region, R1-projection region and R2-region of interest.
Detailed Description
The present disclosure is described in further detail below with reference to the drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant content and not limiting of the present disclosure. It should be further noted that, for convenience of description, only a portion relevant to the present disclosure is shown in the drawings.
In addition, embodiments of the present disclosure and features of the embodiments may be combined with each other without conflict. The technical aspects of the present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Unless otherwise indicated, the exemplary implementations/embodiments shown are to be understood as providing exemplary features of various details of some ways in which the technical concepts of the present disclosure may be practiced. Thus, unless otherwise indicated, features of the various implementations/embodiments may be additionally combined, separated, interchanged, and/or rearranged without departing from the technical concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, when the terms "comprises" and/or "comprising," and variations thereof, are used in the present specification, the presence of stated features, integers, steps, operations, elements, components, and/or groups thereof is described, but the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof is not precluded. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximation terms and not as degree terms, and as such, are used to explain the inherent deviations of measured, calculated, and/or provided values that would be recognized by one of ordinary skill in the art.
Taking an application scenario of oral CBCT as an example, the multi-source imaging device and method of the present disclosure are described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a multi-source imaging device according to one embodiment of the present disclosure. Referring to fig. 1, the multi-source imaging apparatus of the present embodiment includes: the apparatus comprises a detector 100, a first source section 200, a second source section 300, a target region determination module 400 and a region of interest determination module 500.
Fig. 2 is a schematic diagram of a structure of a multi-source imaging device in a three-dimensional view according to one embodiment of the present disclosure. Referring to fig. 2, the first source unit 200 is disposed opposite to the detector 100, and the second source unit 300 is disposed opposite to the detector 100. That is, the first source unit 200 and the second source unit 300 share the same detector 100. The first source unit 200 is configured to image the scan object 900 in cooperation with the detector 100, so as to obtain a first imaging result, so as to implement a large-field shooting function. The dotted arrows in fig. 1 indicate rays emitted from the source section.
The first source part 200 may include a plurality of sources, which may be horizontally arranged or vertically arranged. As shown in fig. 2, the first source portion 200 includes 2 sources, source 210 and source 220, respectively, and by the cooperation of source 210 and source 220, the imaging field of view is increased compared to a single source, thereby enabling ultra-large field of view imaging under a smaller detector. The source 210 and the source 220 are vertically arranged to form the first source portion 200, and the power of the source 210 and the source 220 may be configured to be the same. It is understood that the first source section 200 may also include 3 or more sources, as not limited in this disclosure.
The second source section 300 includes a source 310. The power of source 310 may be configured to be higher than the power of source 210 and source 220, and source 310 may be configured to provide a greater radiation dose, and thus less imaging noise, in combination with the higher resolution provided for detector 100, such that the resolution of the imaging result of second source portion 300 is higher than the resolution of the imaging result of first source portion 200, thereby achieving ultra-high resolution small field of view imaging.
The first and second source parts 200 and 300 may be horizontally arranged, and the imaging fields of view of the first and second source parts 200 and 300 may be the same in length in the horizontal direction. As shown in fig. 2, the first source unit 200 and the second source unit 300 are located on the same horizontal line and have a certain distance from each other.
The multi-source imaging apparatus may further include a rotation mechanism (not shown) to which the detector 100 is mounted on one side of a rotation portion of the rotation mechanism, and the first source portion 200 and the second source portion 300 are mounted on the other side of the rotation portion. The first source unit 200 and the second source unit 300 share the same rotation mechanism. The rotation mechanism may employ a C-arm, with the detector 100 mounted on one arm of the C-arm and the first source section 200 and the second source section 300 mounted on the other arm. The rotation mechanism may be provided with a drive mechanism, for example a motor, to power the rotation mechanism.
Fig. 3 is a schematic diagram of an imaging field of view of a first source section and a second source section in a top view according to one embodiment of the present disclosure. Referring to fig. 3, when the image forming apparatus is operated, the rotation mechanism is controlled to rotate about the rotation axis Z. When the first source unit 200 and the second source unit 300 perform imaging, the center of the imaging field of view is the rotation axis Z. When the rotation axis Z is the imaging center, there is a superimposed portion C between the imaging field V1 of the first source unit 200 and the imaging field V2 of the second source unit 300. The size of the overlapping portion is the smaller of the imaging fields of view V1 and V2. For example, in fig. 3, V1 is entirely covered and greater than V2, so that overlap C is equal to V2. It will be appreciated that there will be a coincidence of the imaging fields of view of the first and second source portions 200, 300, regardless of the magnitude relationship between V1 and V2.
The direction of rotation may be as indicated by the arrow in fig. 2 or in the opposite direction to that indicated by the arrow. The scan object is located between the detector 100 and the two source units, such that the first source unit 200, the second source unit 300, and the detector 100 all rotate around the scan object to achieve the photographing of the scan object by the first source unit 200 and the photographing of the scan object by the second source unit 300. It will be appreciated that the rotation mechanism may be implemented in other shapes or in other forms. When the first source part 200 is activated and works in cooperation with the detector 100 to achieve a shot, the first source part 200 and the detector 100 form a first imaging system. When the second source part 300 is activated and works in cooperation with the detector 100 to achieve a shot, the second source part 300 and the detector 100 form a second imaging system.
Fig. 4 is a schematic diagram of a multi-source imaging device performing a large field of view positioning imaging process according to one embodiment of the present disclosure. Referring to fig. 4, when the multi-source imaging device starts to operate, first, two sources of the first source unit 200 are used to perform matching shooting, so as to obtain a first imaging result of large-field imaging. S1 is an effective imaging range of the first source section 200. The first imaging result is mainly used for positioning, so that the first source part 200 can use a lower radiation dose and take a smaller number of images during the taking. For example, when the rotation mechanism rotates once, the number of images taken by the first source unit 200 is 100. And obtaining a first imaging result after carrying out three-dimensional reconstruction on the shot image.
When the first source unit 200 photographs a scan object, the second source unit 300 does not start photographing. In order to conveniently and accurately locate a region of interest of a user in a scanned object, and also to ensure image resolution at the time of imaging after location, an imaging process of an imaging device is divided into a large-field location imaging process and a small-field shooting process. In the large-field positioning imaging process, the first source part 200 is controlled to shoot, the first imaging result is used as a positioning basis, and the target area determining module 400 and the interest area determining module 500 process and analyze the first imaging result to determine the position of the interest area of the user. The area of interest is small in range and resolution is required to be high. At this time, the small-field high-definition imaging process may be started, and only the region of interest is high-definition imaged by the second source unit 300 as a working source, so as to obtain a second imaging result as a small-field high-definition imaging result. Thus, the scanned object is imaged and imaged twice in total, the first for rapid localization and the second for region of interest imaging. The field of view of the second imaging result is smaller than the field of view of the first imaging result and the resolution of the second imaging result is higher than the resolution of the first imaging result.
The target region determination module 400 is configured to determine a target spatial region based on the location selection information. Wherein the target space region is included in the first imaging result. The target space region S2 is a three-dimensional space region of interest to the user, and the target space region S2 is determined from the first imaging result, and the target space region S2 is a region where the user needs to perform high-definition imaging. For example, when it is necessary to observe a microstructure such as a periodontal ligament or a root canal, the target space region S2 mainly includes a region such as a periodontal ligament or a root canal. It can be understood that the larger the overlapping portion of the imaging fields of view of the two source portions is, the more advantageous the target space region S2 is selected.
The manner in which the target region determination module 400 determines the target spatial region may include: firstly, position selection information is acquired, and then a target space region is determined according to the position selection information and a first imaging result. The position selection information includes position information of the target space region S2, such as positions of vertices of the target space region S2, or a center and a side length of the target space region S2. The position selection information may be obtained automatically by an imaging device through calculation, or may be obtained through user input. After the position selection information is obtained, the position and the size of the target space region S2 in the first imaging result can be determined according to the position information of the target space region S2 contained in the information.
The manner in which the target area determining module 400 obtains the location selection information may be: and receiving position selection information input by a user. Illustratively, after the first imaging result is obtained by the first source part 200, the first imaging result may be displayed by the display, and then the user inputs the position selection information to the imaging device by clicking, framing or inputting a number after viewing the first imaging result, so as to achieve accurate positioning of the target imaging region.
It may be appreciated that the imaging device may pre-configure a plurality of scene modes, set corresponding position selection information for different scene modes in advance, and use the position selection information corresponding to the scene mode when imaging the corresponding scene, so as to determine the target space region S2. Alternatively, the imaging device may automatically generate the position selection information by performing image processing, analysis, and recognition on the first imaging result, through an operation.
The region of interest determination module 500 is configured to determine a region of interest on the detector 100 from the target spatial region, the region of interest being a two-dimensional region, the acquisition surface of the detector 100 being regarded as a two-dimensional planar region, the region of interest being a part of the acquisition surface of the detector 100. When the scanning object is subsequently imaged using the second source unit 300, the position of the target spatial region in the imaged image remains within the region of interest. Since the area of the region of interest is smaller than the acquisition surface area of the detector 100,
the manner in which the region of interest determination module 500 determines the region of interest on the probe 100 from the target spatial region may include: the projection area of the target space region on the detector 100 is first determined according to the target space region and the imaging light path of the second source part 300, and then the region of interest on the detector 100 is determined according to the projection area.
Specifically, after the target space region S2 is acquired, the coordinate range of the target space region S2 is obtained. Since both the position and configuration parameters of the second source section 300 are pre-modulated, the imaging geometry of the second source section 300 is known. The region of interest determination module 500 can calculate the projection region R1 of the target spatial region S2 on the detector 100 when captured by the second source section 300 by the coordinate range of the target spatial region S2 and the imaging geometry light path of the second source section 300. As shown in fig. 4, R1 is the projection of S2 onto the detector 100.
The manner in which the region of interest determination module 500 determines the region of interest on the detector 100 from the projection region may include: first, a plurality of projection areas on the detector 100 in a scanning period are determined according to a preset scanning angle and an imaging light path of the second source part 300, then the highest position and the lowest position of the plurality of projection areas on the detector 100 are determined, and then the width of the region of interest is determined according to the highest position and the lowest position.
Specifically, the scanning angle corresponds to different scanning positions of the second source part 300 during the rotational scanning process, and the higher the resolution of the imaging result required for the second source part 300, the more images captured by the second source part 300 during the rotational process are expected to be, so that the more the scanning angle is, the more the number of projection areas is finally determined. Assuming that the second source unit 300 is required to take 2000 images during one rotation, 2000 scan angles are corresponding. In the case of actually controlling the second source unit 300 to perform shooting, shooting may be performed once every 360/2000 of the rotation angle. It will be appreciated that at this point, the second source section 300 is still in the calculation phase of the region of interest and has not yet begun scanning.
The region of interest determination module 500 obtains 2000 projection regions from 2000 scan angles and corresponding second source portion 300 geometry imaging light paths. The positions of the 2000 projection areas are not exactly the same. The projection region R1 moves over the data acquisition surface of the detector 100 as the scanning process proceeds. And counting all the projection areas to determine the highest position and the lowest position of all the projection areas on the acquisition surface of the detector 100, wherein the difference between the highest position and the lowest position is the width of the region of interest. For example, if the maximum value H1 and the minimum value H2 in the longitudinal direction are determined from all the coordinates of each projection area on the acquisition surface of the detector 100, the width of the region of interest is H1-H2. The target space region S2 is not lower than the position of H2 and is not higher than the position of H1 in the longitudinal direction in the detector 100 when photographed by the second source section 300.
Fig. 5 is a schematic diagram of a multi-source imaging device performing a small field high definition imaging process according to one embodiment of the present disclosure. Referring to fig. 5, with H2 and H1 as boundaries, a region of interest R2 is defined on the acquisition surface of the detector 100, and the length of the region of interest may be set equal to the length of the data acquisition surface of the detector 100 or may be set slightly smaller than the length of the data acquisition surface of the detector 100. All possible projection positions of the target space region S2 on the detector 100 are calculated and determined in advance by the region of interest determining module 500, so that it is determined that when the second source unit 300 shoots the scanning object, the content of the target space region S2 interested by the user falls in the region of interest R2. To this end, a small field high definition imaging process may begin.
The second source section 300 is configured to image the scan object 900 by region of interest in cooperation with the detector 100 to obtain a second imaging result. Wherein the radiation dose and the number of taken images used for imaging by the first source section 200 are smaller than the radiation dose and the number of taken images used for imaging by the second source section 300. When the second source unit 300 photographs the scan object, the first source unit 200 does not start photographing.
With continued reference to fig. 5, after the region of interest determination module 500 determines the region of interest R2, shooting by the source 310 of the second source portion 300 is started to obtain a second imaging result of the small-field imaging. The second imaging result is a high definition imaging result of the portion of interest to the user. Since imaging is performed by the region of interest R2 instead of the entire region of the detector 100, the effective imaging area of the detector 100 is reduced, so that the frame rate of the detector 100 can be increased, a higher radiation dose can be used and a larger number of images can be taken, thereby improving image quality.
For example, typically, the detector 100 acquires images with a full view of the highest resolution, with a maximum frame rate of only 10FPS. If the region of interest width of the detector 100 is one third of the full map, i.e., the value of H2-H1 is about one third of the detector 100 acquisition surface width, the frame rate of the detector 100 may reach 30FPS. Therefore, under the condition that the shooting time is unchanged, the number of images in a single scanning period is three times that of the original images, and the number of images can be greatly increased, so that the image quality is improved.
Fig. 6 is a schematic diagram of a second source portion ray range according to one embodiment of the present disclosure. Referring to fig. 6, the second source part 300 may be provided with a movable beam limiter (not shown), by which the radiation range of the second source part 300 is adjusted to fit the region of interest when the second source part 300 images the scan object according to the region of interest.
In particular, a suitably sized bar-shaped movable beam limiter may be mounted on the source 310 and a corresponding motor may be configured to drive the movable beam limiter to move the beam limiter. The coverage area of the rays of the source 310 is consistent with the region of interest R2 by adjusting the position of the movable beam limiter, so that the performance of the detector 100 is fully utilized, the scattering of the rays is obviously restrained, the scattering artifact is effectively reduced, and the image quality is further improved. In fig. 6, the left side portion is the detector 100 when the radiation is not constrained by the movable beam limiter, and the right side portion is the detector 100 when the radiation is constrained by the movable beam limiter. It will be appreciated that the beam limiter may be mounted on other sources in the imaging device.
According to the multi-source imaging device provided by the embodiment of the disclosure, two source parts share the same detector, a multi-imaging system can be realized only by one detector, the characteristics that imaging fields of the two source parts have overlapping parts are utilized, the two source parts are mutually matched to position a target imaging region, wherein a small amount of exposure is performed by using a first source part to realize the rapid imaging of an oversized field of view, a rough three-dimensional CT image is generated through reconstruction, after a space region of interest which fine shooting is expected to be performed is determined from the three-dimensional CT image, a corresponding ROI (region of interest) on the detector is automatically calculated according to the selected space region position, and then ultra-clear CT imaging is realized by using a second source part immediately. And, the structure of two source portions sharing a detector has reduced CBCT equipment's complexity compared with many detector multi-source's structure. In addition, because the imaging field of view of the detector is fully utilized when the small field of view is shot, the frame rate of the detector can be improved under the condition of not losing the dose, so that the sampled data volume is increased, the image definition and the image quality in the ultra-high resolution small field of view mode are improved, and the ultra-clear imaging of the small field of view is realized.
Fig. 7 is a schematic diagram of a multi-source imaging device employing a hardware implementation of a processing system according to one embodiment of the present disclosure. Referring to fig. 7, the multi-source imaging device 1000 of the present embodiment may further include a memory 1300 and a processor 1200. The memory 1300 stores execution instructions that the processor 1200 executes, such that the processor 1200 controls the coordination and operation between the detector 100, the first source portion 200, the second source portion 300, the target region determination module 400, and the region of interest determination module 500.
The hardware architecture may be implemented using a bus architecture. The bus architecture may include any number of interconnecting buses and bridges depending on the specific application of the hardware and the overall design constraints. Bus 1100 connects together various circuits including one or more processors 1200, memory 1300, and/or hardware modules. Bus 1100 may also connect various other circuits 1400, such as peripherals, voltage regulators, power management circuits, external antennas, and the like.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure. The processor performs the various methods and processes described above. For example, method embodiments in the present disclosure may be implemented as a software program tangibly embodied on a machine-readable medium, such as a memory. In some embodiments, part or all of the software program may be loaded and/or installed via memory and/or a communication interface. One or more of the steps of the methods described above may be performed when a software program is loaded into memory and executed by a processor. Alternatively, in other embodiments, the processor may be configured to perform one of the methods described above in any other suitable manner (e.g., by means of firmware).
Logic and/or steps represented in the flowcharts or otherwise described herein may be embodied in any readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
It should be understood that portions of the present disclosure may be implemented in hardware, software, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or part of the steps implementing the method of the above embodiment may be implemented by a program to instruct related hardware, and the program may be stored in a readable storage medium, where the program when executed includes one or a combination of the steps of the method embodiment.
Furthermore, each functional unit in each embodiment of the present disclosure may be integrated into one processing module, or each unit may exist alone physically, or two or more units may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product. The storage medium may be a read-only memory, a magnetic disk or optical disk, etc.
Fig. 8 is a flow diagram of a multi-source imaging method according to one embodiment of the present disclosure. Referring to fig. 8, the multi-source imaging method S600 of the present embodiment is applied to the multi-source imaging device described in any of the above embodiments. The multi-source imaging device comprises a first source part, a second source part and a detector, wherein the first source part and the second source part are arranged opposite to the detector respectively. The first source section and the second source section share the same detector. The multi-source imaging method S600 method includes the following steps.
S610, imaging a scanning object through a first source part and a detector to obtain a first imaging result.
S620, determining a target space region based on the position selection information, wherein the target space region is contained in the first imaging result.
S630, determining a region of interest on the detector according to the target space region.
And S640, imaging the scanned object according to the region of interest through the second source part and the detector to obtain a second imaging result, wherein the field of view of the second imaging result is smaller than that of the first imaging result, and the resolution of the second imaging result is higher than that of the first imaging result.
The radiation dose used for imaging by the first source portion may be smaller than the radiation dose used for imaging by the second source portion, and the number of captured images imaged by the first source portion may be smaller than the number of captured images imaged by the second source portion.
The first source section may include a plurality of sources, which may be horizontally arranged or vertically arranged, and the second source section may include one source. The first and second source portions may be horizontally arranged, and imaging fields of view of the first and second source portions may be the same in length in the horizontal direction.
The multi-source imaging apparatus may further include a rotation mechanism, the detector being mounted on one side of a rotation portion of the rotation mechanism, and the first source portion and the second source portion being mounted on the other side of the rotation portion.
The manner of determining the target spatial region based on the location selection information in S620 may include: acquiring position selection information; and determining the target space region according to the position selection information and the first imaging result. The method for obtaining the position selection information by the target area determining module may include: and receiving position selection information input by a user.
The manner of determining the region of interest on the detector from the target spatial region in S630 may include: determining a projection area of the target space area on the detector according to the target space area and an imaging light path of the second source part; a region of interest on the detector is determined from the projection region. The method for determining the region of interest on the detector according to the projection region may include: calculating a plurality of projection areas in a scanning period; determining the highest and lowest positions of the plurality of projection areas on the detector; the width of the region of interest is determined from the highest position and the lowest position. The length of the region of interest is equal to the length of the data acquisition face of the detector.
The second source section may be provided with a movable beam limiter by which the radiation range of the second source section may be adjusted to fit the region of interest when the second source section images the scan object per the region of interest.
It should be noted that, details not disclosed in the multi-source imaging method S600 of the present embodiment may refer to details disclosed in the multi-source imaging device of the above embodiment proposed in the present disclosure, and are not described herein again.
According to the multi-source imaging method provided by the embodiment of the disclosure, two source parts share the same detector, a multi-imaging system can be realized by only one detector, the characteristics that imaging fields of the two source parts have overlapping parts are utilized, the two source parts are mutually matched to position a target imaging region, wherein a small amount of exposure is performed by using a first source part to realize the rapid imaging of an oversized field of view, a rough three-dimensional CT image is generated through reconstruction, after a space region of interest which fine shooting is expected to be performed is determined from the three-dimensional CT image, a corresponding ROI (region of interest) on the detector is automatically calculated according to the selected space region position, and then ultra-clear CT imaging is realized by using a second source part immediately. And, the structure of two source portions sharing a detector has reduced CBCT equipment's complexity compared with many detector multi-source's structure. In addition, because the imaging field of view of the detector is fully utilized when the small field of view is shot, the frame rate of the detector can be improved under the condition of not losing the dose, so that the sampled data volume is increased, the image definition and the image quality in the ultra-high resolution small field of view mode are improved, and the ultra-clear imaging of the small field of view is realized.
In the description of the present specification, a description referring to the terms "one embodiment/mode," "some embodiments/modes," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the present disclosure. In this specification, the schematic representations of the above terms are not necessarily the same embodiments/modes or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/implementations or examples described in this specification and the features of the various embodiments/implementations or examples may be combined and combined by persons skilled in the art without contradiction.
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 disclosure, the meaning of "a plurality" is at least two, such as two, three, etc., unless explicitly specified otherwise.
It will be appreciated by those skilled in the art that the above-described embodiments are merely for clarity of illustration of the disclosure, and are not intended to limit the scope of the disclosure. Other variations or modifications will be apparent to persons skilled in the art from the foregoing disclosure, and such variations or modifications are intended to be within the scope of the present disclosure.
Claims (10)
1. A multi-source imaging apparatus, comprising:
a detector;
the first source part is arranged opposite to the detector and is configured to image a scanning object in cooperation with the detector to obtain a first imaging result;
a target region determination module configured to determine a target spatial region based on position selection information, wherein the target spatial region is included in the first imaging result;
a region of interest determination module configured to determine a region of interest on the detector as a function of the target spatial region;
and a second source part arranged opposite to the detector and configured to image the scanning object according to the region of interest by matching with the detector to obtain a second imaging result, wherein the field of view of the second imaging result is smaller than that of the first imaging result, the resolution of the second imaging result is higher than that of the first imaging result, and the first source part and the second source part share the same detector.
2. The apparatus of claim 1, wherein the first source portion is configured to image a radiation dose less than the second source portion, and wherein the first source portion is configured to image a fewer number of images than the second source portion.
3. The apparatus of claim 1 or 2, wherein the first source section comprises a plurality of sources, the plurality of sources being horizontally or vertically arranged, and the second source section comprises one source.
4. The apparatus of claim 1 or 2, wherein the first and second source portions are horizontally arranged, and an imaging field of view of the first and second source portions has an overlapping portion in a horizontal direction.
5. The apparatus of claim 1, wherein the apparatus further comprises: and the detector is arranged on one side of a rotating part of the rotating mechanism, and the first source part and the second source part are arranged on the other side of the rotating part.
6. The apparatus according to claim 1 or 2, wherein the means for determining the target region based on the location selection information comprises:
acquiring position selection information;
and determining a target space area according to the position selection information and the first imaging result.
7. The apparatus of claim 6, wherein the means for obtaining location selection information by the target area determination module comprises:
and receiving position selection information input by a user.
8. The apparatus according to claim 1 or 2, wherein the region of interest determination module determines a region of interest on the detector as a function of the target spatial region comprises:
determining a projection area of the target space area on the detector according to the imaging light paths of the target space area and the second source part;
and determining a region of interest on the detector according to the projection region.
9. The apparatus of claim 8, wherein the means for determining the region of interest on the detector from the projection region comprises:
determining a plurality of projection areas on the detector in a scanning period according to a preset scanning angle and an imaging light path of the second source part;
determining highest and lowest positions of the plurality of projection areas on the detector;
and determining the width of the region of interest according to the highest position and the lowest position.
10. A multi-source imaging method, wherein the multi-source imaging method is applied to the multi-source imaging apparatus of any one of claims 1-9, the method comprising:
imaging a scanning object through a first source part and a detector to obtain a first imaging result;
determining a target space region based on the position selection information, wherein the target space region is contained in the first imaging result;
determining a region of interest on the detector according to the target space region;
and imaging the scanning object according to the region of interest through a second source part and the detector to obtain a second imaging result, wherein the field of view of the second imaging result is smaller than that of the first imaging result, and the resolution of the second imaging result is higher than that of the first imaging result.
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