CN108652657B - Bed plate settling amount obtaining method, multi-modal medical imaging system and computer-readable storage medium - Google Patents
Bed plate settling amount obtaining method, multi-modal medical imaging system and computer-readable storage medium Download PDFInfo
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- CN108652657B CN108652657B CN201810516649.7A CN201810516649A CN108652657B CN 108652657 B CN108652657 B CN 108652657B CN 201810516649 A CN201810516649 A CN 201810516649A CN 108652657 B CN108652657 B CN 108652657B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/04—Positioning of patients; Tiltable beds or the like
- A61B6/0407—Supports, e.g. tables or beds, for the body or parts of the body
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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
- A61B6/02—Devices for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
- A61B6/03—Computerised tomographs
- A61B6/037—Emission tomography
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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
- A61B6/52—Devices using data or image processing specially adapted for radiation diagnosis
- A61B6/5211—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data
- A61B6/5229—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image
- A61B6/5235—Devices using data or image processing specially adapted for radiation diagnosis involving processing of medical diagnostic data combining image data of a patient, e.g. combining a functional image with an anatomical image combining images from the same or different ionising radiation imaging techniques, e.g. PET and CT
Abstract
The embodiment of the invention provides a bed plate settlement amount obtaining method, a multi-mode medical imaging system and a computer readable storage medium, and relates to the technical field of image processing. In one aspect, in an embodiment of the present invention, first, a CT image of a subject is acquired, and from the CT image, equivalent masses of the subject at respective designated positions are acquired; then, acquiring the product of the equivalent mass at each designated position and the sedimentation amount caused by the unit mass at each designated position to obtain the sedimentation amount of the detected body at each designated position; thus, the total settling amount of the bed plate at each specified position is acquired from the subject settling amount at each specified position and the bed plate self-weight settling amount at each specified position. Therefore, the technical scheme provided by the embodiment of the invention can solve the problem of complex implementation mode caused by the need of additionally adding a scanning protocol in a scanning system when the settlement amount at each appointed position of the bed plate is measured by using a laser positioning mode in the prior art.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of image processing, in particular to a bed plate settlement amount obtaining method, a multi-modal medical imaging system and a computer readable storage medium.
[ background of the invention ]
Computed Tomography (CT) provides precise anatomical localization of lesions, while Positron Emission Tomography (PET) provides detailed functional and metabolic molecular information of lesions. The PET-CT system organically combines the CT anatomical image and the PET functional metabolic image together, and remarkably improves the diagnosis capability of small focuses.
In a long-axial PET-CT system, when a bed plate extends out of a fixed base for a long distance, one end of the bed plate, which is far away from the base, is deformed and bent under the influence of gravity, so that the bed plate is settled, and a pre-acquired CT image cannot be matched with a currently scanned PET image. In order to solve the problem, the scheme adopted in the prior art is to use a laser positioning mode to obtain the settling volume, and specifically, the settling volume at each designated position of the bed plate is measured by using laser positioning during each scanning.
However, in the prior art, when the settling volume at each designated position of the bed plate is measured by using a laser positioning method, a scanning protocol needs to be additionally added to a scanning system, so that the implementation method is complicated.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a bed plate settling amount obtaining method, a multi-modality medical imaging system, and a computer-readable storage medium, so as to solve the problem in the prior art that when a laser positioning method is used to measure the settling amount at each designated position of a bed plate, a scanning protocol needs to be additionally added to a scanning system, which results in a complex implementation method.
In one aspect, an embodiment of the present invention provides a bed plate settling amount obtaining method, where the bed plate includes a first end close to a CT apparatus, and a second end opposite to the first end and far from the CT apparatus, and the first end and the second end include at least one designated position therebetween, the method includes:
acquiring a CT image of a subject;
acquiring equivalent mass of the detected body at each appointed position according to the CT image;
acquiring the product of the equivalent mass at each specified position and the sedimentation amount caused by the unit mass at each specified position to obtain the sedimentation amount of the detected body at each specified position;
and acquiring the total settlement of the bed board at each specified position according to the detected body settlement at each specified position and the bed board self-weight settlement at each specified position.
The above aspect and any possible implementation manner further provide an implementation manner, in which a total settlement amount of the bed board at each designated position is obtained according to a subject settlement amount at each designated position and a bed board self-weight settlement amount at each designated position, the implementation manner including:
performing specified processing on the detected body settlement amount at each specified position to obtain the detected body settlement amount at the second end;
acquiring the sum of the sedimentation amount of the detected body at the second end and the self-weight sedimentation amount of the bed board at the second end to obtain the total sedimentation amount of the bed board at the second end;
and acquiring the total settlement of the bed board at each designated position according to the relative position relation between each designated position and the second end and the total settlement of the bed board at the second end.
The above aspect and any possible implementation further provide an implementation, wherein the relative position relationship is a ratio between a first distance and a second distance; wherein the first distance is a distance between each of the designated positions and the first end, and the second distance is a distance between the first end and the second end.
The above aspect and any possible implementation manner further provide an implementation manner, wherein obtaining the total settlement amount of the bed board at each designated position according to the relative position relationship between each designated position and the second end and the total settlement amount of the bed board at the second end includes:
and obtaining the product of the total settling volume of the bed plate at the second end and the relative position relation to obtain the total settling volume of the bed plate at each specified position.
The above aspect and any possible implementation further provide an implementation in which, from the CT image, an equivalent mass of the subject at each specified position is acquired, including:
acquiring CT values at the designated positions according to the CT images, wherein the CT values are used for representing the density of the examined tissue;
acquiring the weight composition structure of the detected body at each appointed position according to the CT value at each appointed position;
and acquiring the equivalent mass of the detected body at each appointed position according to the weight composition structure of the detected body at each appointed position.
The above-described aspects and any possible implementations further provide an implementation, and the method further includes:
acquiring the settlement amount triggered by the unit mass at each appointed position;
and generating a unit mass settlement lookup table according to the settlement caused by the unit mass at each specified position.
The above aspect and any possible implementation manner further provide an implementation manner, wherein obtaining the amount of sedimentation induced by unit mass at each designated position includes:
placing a bearing object at each appointed position between the first end and the second end, and acquiring the bearing settlement of the bearing object at each appointed position;
acquiring the difference between the bearing settlement of the bearing object at each appointed position and the self-weight settlement of the bed board at the appointed position to obtain the net bearing settlement at each appointed position;
and obtaining the quotient of the net bearing settlement amount at each appointed position and the mass of the bearing object to obtain the settlement amount caused by the unit mass at each appointed position.
In another aspect, an embodiment of the present invention provides a multi-modality medical imaging system, including:
a CT scanner having a first scanning bore;
a PET scanner having a second scanning aperture, the PET scanner coupled to the CT scanner, the first scanning aperture aligned with the second scanning aperture and having an axial length less than an axial length of the second scanning aperture;
the bed plate is used for bearing a detected body and can move from the second scanning hole cavity to the first scanning hole cavity or from the first scanning hole cavity to the second scanning hole cavity after bearing the detected body;
a processor connected to the CT scanner and/or the PET scanner for acquiring a CT image of the subject, the CT image corresponding to scan data of the subject within the first scan bore; acquiring equivalent mass of the detected body at each appointed position according to the CT image;
acquiring the product of the equivalent mass at each designated position and the settlement caused by the unit mass at each designated position to obtain the settlement of the detected body of the bed board at each designated position;
and acquiring the total settlement of the bed board at each specified position according to the detected body settlement at each specified position and the bed board self-weight settlement at each specified position.
The above-described aspects and any possible implementations further provide an implementation in which the processor is further configured to:
transforming the CT image according to the total settlement amount at each designated position to obtain a CT transformed image;
acquiring PET data of the same subject, wherein the PET data correspond to scanning data of the subject in a second scanning cavity;
reconstructing PET data acquires a PET image of a subject, and attenuation correction is performed on the PET image based on the CT transformed image during the PET data reconstruction.
In another aspect, an embodiment of the present invention provides a computer-readable storage medium, including: computer-executable instructions which, when executed, perform the bed plate settling amount acquisition method of any of the above-described implementations.
In the embodiment of the invention, the settlement amount of each appointed position of the bed board is decomposed into the settlement amount caused by the weight of the detected body and the settlement amount caused by the self weight of the bed board, and based on the settlement amount, the equivalent mass of the detected body at each appointed position can be obtained in real time by directly processing the collected CT image, so that the settlement amount of the detected body at each appointed position can be obtained according to the product of the equivalent mass of the detected body at each appointed position and the settlement amount caused by the unit mass of each appointed position, the operation is simple, the accuracy is high, further, the total settlement amount of each appointed position of the bed board can be obtained by combining the settlement amount of the self weight of the bed board at each appointed position, the use of auxiliary equipment is avoided, the cost is low, in addition of any scanning protocol is not needed in the process, and the realization complexity is reduced. Therefore, compared with the scheme of measuring the settling volume at each designated position of the bed plate by using a laser positioning mode in the prior art, the embodiment of the invention can solve the problem of complex implementation mode caused by the need of additionally adding a scanning protocol in a scanning system when measuring the settling volume at each designated position of the bed plate by using the laser positioning mode in the prior art.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic side view of a structure between a bed plate and a CT according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a bed plate settlement amount obtaining method provided by an embodiment of the invention;
fig. 3 is a schematic flowchart of acquiring equivalent mass of a subject at each specified position according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of obtaining the amount of settling induced per unit mass at each designated location according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of acquiring the total settling amount of the bed plate at each designated position according to the embodiment of the present invention;
fig. 6 is a functional block diagram of a bed plate settlement amount obtaining device according to an embodiment of the present invention;
fig. 7 is a structural diagram of a multi-modality medical imaging system provided by an embodiment of the invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
Example one
An embodiment of the present invention provides a bed plate settling amount obtaining method, as shown in fig. 1, which is a schematic side view of a structure between a bed plate and a CT provided in an embodiment of the present invention, where the bed plate includes a first end a close to a CT apparatus and a second end B opposite to the first end and far from the CT apparatus, and at least one designated position is included between the first end and the second end. For ease of understanding, one designated location C between the first end a and the second end B is shown in fig. 1.
Please refer to fig. 2, which is a schematic flow chart of a method for acquiring bed plate settlement provided in an embodiment of the present invention, the method for acquiring bed plate settlement specifically includes the following steps:
s201, a CT image of the subject is acquired.
S202, the equivalent mass of the subject at each designated position is acquired from the CT image.
It should be noted that the CT image is one or more slice images, such as a cross-section, obtained from CT scan data through an image reconstruction algorithm, wherein the image reconstruction algorithm may include, but is not limited to, at least one of Filtered Back Projection (FBP) and Ordered Subsets optimization visualization (OSEM).
Illustratively, the CT image may be a 3D image composed of n slice images (2D slice images), where n is a positive integer greater than or equal to 1. In this embodiment, a plurality of 2D cross-sectional images are stacked in the height direction of the subject to form a 3D CT image, and one or more layers (each 2D cross-sectional image) of the CT image correspond one-to-one to a specified position on the bed plate. It will be appreciated that the location of the CT scan is generally entirely known, as can be determined from the scout image associated with the imaging scan. The distance of the bed extending out of the support can be determined according to the position of CT scanning, and the two have a corresponding relation. Further, the position of the subject can be determined by each slice of the CT image.
S203, acquiring the product of the equivalent mass at each designated position and the sedimentation amount caused by the unit mass at the designated position to obtain the sedimentation amount of the detected body at each designated position. The sinking amount of the subject at each designated position of the patient bed in the present application may refer to the sinking amount of the bed plate caused by the weight of the subject at each designated position after the patient bed bears the subject.
S204, acquiring the total settlement of the bed board at each specified position according to the detected body settlement at each specified position and the bed board self-weight settlement at the specified position.
The following describes the implementation of each of the above steps.
For convenience of understanding, first, a manner for implementing the step S202 is provided in the embodiment of the present invention, please refer to fig. 3, which is a schematic flow chart for acquiring equivalent mass of the subject at each designated position provided in the embodiment of the present invention, and the method specifically includes the following steps:
s2021, CT values of the subject at the respective designated positions are acquired from the CT images.
Illustratively, according to a preset specified position, a CT slice image corresponding to the specified position in the acquired CT image is acquired, so that the CT value at the specified position is determined according to the CT slice image.
Note that the CT value is a corresponding value or an absorption coefficient of each tissue in the CT image corresponding to the X-ray attenuation coefficient. The tissue organ density can be obtained through different gray scales in the CT image. In this embodiment, the CT value is used to characterize the density of the tissue of the subject in Hounsfield Unit (HU), for example, the CT value for bone is in the range of 700HU or more, the CT value for muscle is in the range of 35-55 HU, the CT value for fat is in the range of-120-90 HU, the CT value for lung is in the range of-700-600 HU, and the CT value for air is around-1000 HU, i.e.: the higher the density of the tissue and the organ is, the larger the corresponding CT value is; otherwise, the corresponding CT value is smaller.
S2022, a body weight composition structure of the subject at each designated position is acquired based on the CT value at each designated position.
The CT values of different tissues of the subject are different, and therefore, the body weight composition structure at any given position, such as the proportion of the volume of the tissues such as bones, muscles or fat to the total volume, can be determined according to the CT value at the given position.
In a specific implementation process, the weight composition structure can be represented by a three-dimensional weight image M (x, y, z), wherein the x direction and the z direction are located on the same horizontal plane, the z direction can be set as the axial direction of the system or the front-back direction from the head to the feet of the subject during the detection on the sickbed, the x direction and the z direction intersect perpendicularly to form an intersection point, and the y direction is located on a plane perpendicular to the horizontal plane and passes through the intersection point formed by the perpendicular intersection of the x direction and the z direction. The physical meaning of each coordinate axis can be set according to needs.
S2023, acquiring equivalent mass of the subject at each designated position according to the body weight composition structure of the subject at each designated position.
Based on the body weight tissue structure represented by the three-dimensional space image, when this step is performed, the equivalent mass s (z) of the subject can be obtained by compressing the three-dimensional space body weight image M (x, y, z) into a one-dimensional space in the z direction, enabling simplified calculation, i.e., the calculation
To facilitate understanding of the embodiments of the present invention, a process of acquiring equivalent masses of a subject at respective designated positions will now be exemplified. For example, with the first end of the bed board as a reference point, a position 5 cm away from the reference point is a designated position, the designated position corresponds to a second slice image in the CT image, the CT value of the second slice image indicates that the layer is composed of bone, muscle and fat, wherein the bone volume accounts for 10% of the total volume V of the bone, muscle and fat, the muscle volume accounts for 50% of the total volume V of the bone, muscle and fat, and the fat volume accounts for 40% of the total volume V of the bone, muscle and fat, and then the equivalent mass at the designated position is ρSkeleton(s)×10％V+ρMuscle×50％V+ρFatX 40% V, where ρSkeleton(s)Is the density of the bone, ρMuscleIs the density of the muscle, pFatIs the density of fat, pSkeleton(s)、ρMuscleAnd ρFatIs a constant.
Next, when step S203 is executed, it is required to obtain the settling amount induced by the unit mass at each designated location, please refer to fig. 4, which is a schematic flow chart of obtaining the settling amount induced by the unit mass at each designated location according to the embodiment of the present invention, and the method specifically includes the following steps:
s2031, placing a bearing object at each appointed position between the first end and the second end, and acquiring the bearing settlement of the bearing object at each appointed position. Alternatively, the first end may be a reference position, and a plurality of designated positions may be set apart from the reference position from the direction in which the first end points to the second end. In practical applications, the second end may be considered to be the designated position farthest from the reference position.
Alternatively, the location of the CT scan is completely known, as can be determined from the scout image associated with the imaging scan, and also from the positional relationship of the CT image to the background image. Further, the distance of the bed extending out of the support can be determined according to the position of CT scanning, and the two positions have a corresponding relation. In this embodiment, the distances from the reference positions are determined by using the CT images of the respective layers, so that the CT images corresponding to the subject change even if the subject moves during the scanning process, and no error is caused in the calculation of the settling amount.
S2032, obtaining the difference between the bearing settlement of the bearing object at each appointed position and the self-weight settlement of the bed plate at the appointed position, and obtaining the net bearing settlement at each appointed position.
S2033, obtaining the quotient of the net bearing settlement amount at each appointed position and the mass of the bearing object, and obtaining the settlement amount caused by the unit mass at each appointed position.
Note that the bed plate self-weight settling amount at each designated position in S2032 can be obtained in the following two ways:
firstly, directly reading the settlement amount of the bed plate at the second end in the delivery parameters; then, according to the distance between the designated position and the first end and the distance between the first end and the second end, the self-weight settlement amount of the bed plate at each designated position is obtained.
For example, the specified position is a distance l from the first end1The distance between the first end and the second end is D1The settling volume of the bed plate at the second end is Deltax', and the self-weight settling volume Deltax of the bed plate at each designated position1Is composed of
And secondly, measuring the vertical distance between the first end of the bed board and the ground and the vertical distance between the second end of the bed board and the ground, and obtaining the settlement of the bed board at the second end by taking the difference between the two.
For example, the first end of the bed plate is at a vertical distance d from the ground1The second end is at a vertical distance d from the ground2The settling amount Deltax' of the bed board at the second end is
Δx″＝d1-d2
The distance between the designated position and the first end is l2The distance between the first end and the second end is D2Then the self-weight settlement quantity Deltax of the bed board at each designated position2Is composed of
The implementation of obtaining the amount of settling induced per mass at each specified location is now illustrated. Exemplarily, the first end is taken as a reference point, and the distance is a from the reference point1Is located at a specified position 1 and is a distance away from the reference point2Is designated as position 2, and the distance between the first end and the second end is D. Placing a bearing object with the mass G at the designated position 1, and measuring to obtain the bearing settlement b at the designated position 11Then, the carrier is placed at the designated position 2, and the amount of the carried sediment at the designated position 2 is measured as b2Wherein G is a positive number greater than or equal to 1. And the self-weight settlement of the bed plate at the designated position 1 is c1The self-weight settlement of the bed plate at the designated position 2 is c2Thus, the amount of settling induced per mass e at location 1 is specified1Is composed of
Amount of settling induced per unit mass e at designated location 22Is composed of
This makes it possible to obtain the amount of sedimentation induced per unit mass at each prescribed position.
In a specific application scene, a unit mass settling amount lookup table is generated according to the settling amount caused by the unit mass at each designated position and is used for directly carrying out corresponding calibration on a subsequent CT image, so that repeated measurement of settling amount data is avoided, and the data processing efficiency is improved.
And obtaining the sinking amount of the detected body at each specified position based on the product of the obtained equivalent mass at each specified position and the sinking amount caused by the unit mass at the specified position.
Furthermore, the embodiment of the present invention provides the following two implementation manners for acquiring the total settling volume of the bed board at each designated position in step S204:
first, as shown in fig. 5, which is a schematic flow chart for acquiring a total settling amount of a bed plate at each designated position according to an embodiment of the present invention, the implementation manner specifically includes the following steps:
s2041, a specified process is performed on the sample sedimentation amount at each specified position, and the sample sedimentation amount at the second end is obtained.
The processing method of the designated processing is as follows: and taking the first end as a reference point, sequentially acquiring the difference between the sedimentation amount of the detected body at each appointed position and the sedimentation amount of the detected body at the previous appointed position according to the direction which is far away from the first end and is close to the second end, and acquiring the sum of the difference values to obtain the sedimentation amount of the detected body at the second end.
For example, a designated position 1, a designated position 2 and a designated position 3 are arranged between the first end and the second end of the bed plate, and the sedimentation amount of the detected body at the designated position 1 is h1The sedimentation amount of the subject at the designated position 2 is h2The sedimentation amount of the subject at the designated position 3 is h3. Assuming that the first end is a reference point where there is no sedimentation, the sedimentation amount of the subject at the specified position 1 is different from the sedimentation amount at the first end by Δ y1The difference between the subject sedimentation amount at the specified position 2 and the subject sedimentation amount at the specified position 1 is Δ y2The difference between the subject sedimentation amount at the specified position 3 and the subject sedimentation amount at the specified position 2 is Δ y3Then, the subject at the second end sinksThe reduction amount Deltay is
Δy＝Δy1+Δy2+Δy3
S2042, the sum of the sedimentation amount of the detected body at the second end and the self-weight sedimentation amount of the bed board at the second end is obtained, and the total sedimentation amount of the bed board at the second end is obtained.
Illustratively, the subject sedimentation amount at the second end is Δ y, the bed plate self-weight sedimentation amount at the second end is Δ x, and then the total sedimentation amount Δ of the bed plate at the second endfinalIs composed of
Δfinal＝Δx+Δy
S2043, obtaining the total settlement of the bed board at each designated position according to the relative position relation between each designated position and the second end and the total settlement of the bed board at the second end.
It should be noted that the relative position relationship is a ratio between a first distance and a second distance, where the first distance l is a distance between each designated position and the first end, and the second distance D is a distance between the first end and the second end.
Obtaining a total settling amount delta of the bed plate at the second endfinalThe product of the relative position relationship is used to obtain the total settlement delta of the bed board at each designated positionlIs composed of
Second, the total settling amount of the top board at each predetermined position is obtained by adding the settling amount of the subject at each predetermined position to the self-weight settling amount of the top board at the predetermined position, and the calculation is simple.
On the basis of the above embodiments, the present embodiment provides a computer-readable storage medium.
Illustratively, the computer-readable storage medium includes computer-executable instructions, which, when executed, can perform the bed plate settlement amount obtaining method provided in the present embodiment.
In the embodiment of the invention, the settlement amount of each appointed position of the bed board is decomposed into the settlement amount caused by the weight of the detected body and the settlement amount caused by the self weight of the bed board, and based on the settlement amount, the equivalent mass of the detected body at each appointed position can be obtained in real time by directly processing the collected CT image, so that the settlement amount of the detected body at each appointed position can be obtained according to the product of the equivalent mass of the detected body at each appointed position and the settlement amount caused by the unit mass of each appointed position, the operation is simple, the accuracy is high, further, the total settlement amount of each appointed position of the bed board can be obtained by combining the settlement amount of the self weight of the bed board at each appointed position, the use of auxiliary equipment is avoided, the cost is low, in addition of any scanning protocol is not needed in the process, and the realization complexity is reduced. Therefore, compared with the scheme of measuring the settling volume at each designated position of the bed plate by using a laser positioning mode in the prior art, the embodiment of the invention can solve the problem of complex implementation mode caused by the need of additionally adding a scanning protocol in a scanning system when measuring the settling volume at each designated position of the bed plate by using the laser positioning mode in the prior art.
Example two
Based on the bed board settling amount obtaining method provided in the first embodiment, an embodiment of the present invention further provides a bed board settling amount obtaining apparatus for implementing the method, as shown in fig. 1 in the first embodiment, the bed board includes a first end a close to the CT apparatus, and a second end B opposite to the first end and far from the CT apparatus, and at least one designated position is included between the first end and the second end. For ease of understanding, one designated location C between the first end a and the second end B is shown in fig. 1.
Specifically, please refer to fig. 6, which is a functional block diagram of a bed plate sedimentation amount obtaining device according to an embodiment of the present invention. As shown in fig. 6, the bed plate settling amount obtaining device 61 includes:
a first acquisition unit 601 configured to acquire a CT image of the subject and acquire equivalent masses of the subject at respective designated positions based on the CT image;
a second obtaining unit 602, configured to obtain a product of the equivalent mass at each specified position and a settling amount caused by the unit mass at each specified position, so as to obtain a sample settling amount at each specified position;
a third acquiring unit 603 configured to acquire a total settling amount of the bed plate at each of the designated positions based on the detected body settling amount at each of the designated positions and the bed plate self-weight settling amount at each of the designated positions.
In a specific implementation process, the first obtaining unit 601 is specifically configured to obtain, according to an acquired CT image, a CT value at each designated location, where the CT value is used to represent the density of the tissue of the subject;
acquiring a weight composition structure of the detected body at each appointed position according to the CT value at each appointed position;
the equivalent mass of the subject at each specified position is acquired based on the weight composition structure of the subject at each specified position.
In a specific implementation, the second obtaining unit 602 is specifically configured to obtain the settling amount induced by the unit mass at each specified location.
Furthermore, the second obtaining unit 602 is further configured to place a carrier at each designated position between the first end and the second end, and obtain a carrying settlement amount of the carrier at each designated position;
acquiring the difference between the bearing settlement of the bearing object at each designated position and the self-weight settlement of the bed plate at the designated position to obtain the net bearing settlement at each designated position;
and obtaining the quotient of the net bearing settlement at each appointed position and the mass of the bearing object to obtain the settlement caused by the unit mass at each appointed position.
In a specific application scenario, the second obtaining unit 602 is further configured to generate a unit mass settling amount lookup table according to the settling amount caused by the unit mass at each specified location.
In a specific implementation process, the third obtaining unit 603 is specifically configured to perform a specified process on the sample sedimentation amount at each specified position, so as to obtain a sample sedimentation amount at the second end;
acquiring the sum of the sedimentation amount of the detected body at the second end and the self-weight sedimentation amount of the bed board at the second end to obtain the total sedimentation amount of the bed board at the second end;
and acquiring the total settlement of the bed plate at each specified position according to the relative position relation between each specified position and the second end and the total settlement of the bed plate at the second end.
It should be noted that the relative position relationship is a ratio between the first distance and the second distance; the first distance is the distance between each designated position and the first end, and the second distance is the distance between the first end and the second end.
Illustratively, the third obtaining unit 603 is further configured to obtain a product of the total settling amount of the bed board at the second end and the relative position relationship, and obtain the total settling amount of the bed board at each specified position.
In a specific application scenario, the third obtaining unit 603 is configured to obtain a sum of a settling amount of the subject at each designated position and a self-weight settling amount of the bed board at each designated position, so as to obtain a total settling amount of the bed board at each designated position.
Since each unit in this embodiment can execute the method shown in the first embodiment, reference may be made to the related description of the first embodiment for a part of this embodiment that is not described in detail.
On the basis of the above embodiments, an embodiment of the present invention further provides a multi-modality medical imaging system, which includes two modality medical imaging apparatuses, where the two modality medical imaging apparatuses share the same bed board, but the two modality medical imaging apparatuses have different axial apertures or lengths. Generally, the bed board bracket is arranged in a medical imaging device with a smaller axial aperture, and the bed board can move to another medical imaging device with a larger aperture, but a certain sinking is generated.
As shown in fig. 7, a schematic structural diagram of a multi-modality medical imaging system provided by an embodiment of the present invention includes:
a CT scanner may include a CT detector support frame supporting a detector, and a housing enclosing the CT detector and the support frame forming a first scanning bore having an aperture. In this embodiment the radial direction of the first scanning bore may be set to be around 25-50cm and the length in the axial direction to be around 20-40 cm. Further, a bed board support (a base in the drawing) is arranged in the first scanning hole cavity, the bed board support can support the bed board, and the bed board support is movably connected with the sickbed. For example, the subject can be carried and moved from a bore of the CT scanner to a bore of the PET scanner or vice versa.
A PET scanner coupled to the CT scanner. In one embodiment, a PET scanner includes a PET detector and a support, with a housing enclosing the PET detector and the support, forming a second scanning bore having an aperture. In this embodiment, the PET detectors include a plurality of PET detector rings arranged side-by-side along the axial direction. Further, the first scanning aperture is aligned with the second scanning aperture along the axial direction, and an axial length of the first scanning aperture is smaller than an axial length of the second scanning aperture. In this embodiment the radial direction of the second scanning bore may be set to be around 25-50cm and the length in the axial direction to be around 1.2-2 m.
A processor connected to the CT scanner and/or the PET scanner for determining the amount of sinking of the subject within the second scanning bore relative to the first scanning bore. It should be noted that, due to the small axial dimension of the first scanning bore and the bed plate support supporting the bed plate, the amount of settling of the bed plate in the first scanning bore due to its own weight is negligible here. Thus, the bed plate is considered herein to be free of settling within the first scanning bore.
In one embodiment, determining the amount of sedimentation of the subject within the second scanning bore relative to the first scanning bore comprises:
CT data of the subject is acquired, the CT data being acquired while the patient bed is in the first scanning bore. Alternatively, the couch is moved during the scan, and the CT data obtained may include data for a plurality of scan beds. In this embodiment, the CT data may include scan data for five beds.
Reconstructing the CT data acquires a CT image of the subject. Alternatively, the CT data reconstruction algorithm may employ a filtered back projection method (FBP), a hybrid iterative method (iDose4), a fully iterative model reconstruction method (IMR), a local reconstruction method (LocalRA), a modified algebraic reconstruction method, or the like.
And determining the settlement amount of the bed plate relative to the coupling position when the bed plate is in the second scanning hole cavity according to the CT image. In this embodiment, the sedimentation amount comprises a first sedimentation amount, which is a bed plate sedimentation amount induced by carrying the subject.
In another embodiment, the settling of the bed plate within the first scanning bore due to its own weight becomes more pronounced due to the smaller axial dimension of the second scanning bore and the bed plate holder being further from the bed plate. Thus, in this embodiment, a second amount of settling of the bed plate in the second scanning bore can be determined, which is the amount of settling due to the self weight of the bed plate relative to the coupling position.
In another embodiment, the CT image may be subjected to deformation processing according to the bed plate settlement amount obtained by calculation, so as to obtain a CT deformation image matched with the PET scanning bed, and further be applied to attenuation correction in the PET reconstruction process. In this embodiment, the CT image may be transformed according to the first and second settling amounts to obtain a CT transformed image. Acquiring PET data of the same subject, wherein the PET data is acquired when the hospital bed scans the cavity; reconstructing the PET data a PET image of the subject is acquired and the PET image is attenuation corrected based on the CT transform image during reconstruction of the PET data, for example: an attenuation map is determined based on the CT image, and the PET image is corrected using the attenuation map. In this embodiment, the deformation of the CT image can be expressed by the following formula:
M(x,y,z)＝CT(x,y+Δz,z)
where M (x, y, z) represents an image after CT deformation, CT (x, y, z) represents an original CT image or an image before deformation, x, y, and z represent the left-right direction, the up-down direction, and the front-back direction (axial direction) of the subject in the supine position on the bed plate, respectively, and Δ z represents the bed plate settling amount.
In the embodiment of the invention, the settlement amount of each appointed position of the bed board is decomposed into the settlement amount caused by the weight of the detected body and the settlement amount caused by the self weight of the bed board, and based on the settlement amount, the equivalent mass of the detected body at each appointed position can be obtained in real time by directly processing the collected CT image, so that the settlement amount of the detected body at each appointed position can be obtained according to the product of the equivalent mass of the detected body at each appointed position and the settlement amount caused by the unit mass of each appointed position, the operation is simple, the accuracy is high, further, the total settlement amount of each appointed position of the bed board can be obtained by combining the settlement amount of the self weight of the bed board at each appointed position, the use of auxiliary equipment is avoided, the cost is low, in addition of any scanning protocol is not needed in the process, and the realization complexity is reduced. Therefore, compared with the scheme of measuring the settling volume at each designated position of the bed plate by using a laser positioning mode in the prior art, the embodiment of the invention can solve the problem of complex implementation mode caused by the need of additionally adding a scanning protocol in a scanning system when measuring the settling volume at each designated position of the bed plate by using the laser positioning mode in the prior art.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A bed plate settling amount obtaining method, wherein the bed plate comprises a first end close to a CT device and a second end opposite to the first end and far away from the CT device, and at least one designated position is included between the first end and the second end, the method comprising:
acquiring a CT image of a subject;
acquiring equivalent mass of the detected body at each appointed position according to the CT image;
acquiring the product of the equivalent mass at each designated position and the settlement caused by the unit mass at each designated position to obtain the settlement of the detected body of the bed board at each designated position;
acquiring the total settlement of the bed board at each specified position according to the settlement of the detected body at each specified position and the self-weight settlement of the bed board at each specified position;
acquiring equivalent mass of the subject at each specified position according to the CT image, comprising:
acquiring CT values at the designated positions according to the CT images, wherein the CT values are used for representing the density of the examined tissue;
acquiring the weight composition structure of the detected body at each appointed position according to the CT value at each appointed position;
and acquiring the equivalent mass of the detected body at each appointed position according to the weight composition structure of the detected body at each appointed position.
2. The method according to claim 1, wherein obtaining a total settling amount of the bed board at each of the designated positions from the subject settling amount at each of the designated positions and the bed board self-weight settling amount at each of the designated positions comprises:
performing specified processing on the detected body settlement amount at each specified position to obtain the detected body settlement amount at the second end;
acquiring the sum of the sedimentation amount of the detected body at the second end and the self-weight sedimentation amount of the bed board at the second end to obtain the total sedimentation amount of the bed board at the second end;
and acquiring the total settlement of the bed board at each designated position according to the relative position relation between each designated position and the second end and the total settlement of the bed board at the second end.
3. The method of claim 2, wherein the relative positional relationship is a ratio between a first distance and a second distance; wherein the first distance is a distance between each of the designated positions and the first end, and the second distance is a distance between the first end and the second end.
4. The method of claim 3, wherein obtaining the total settling amount of the bed board at each designated position according to the relative position relationship between each designated position and the second end and the total settling amount of the bed board at the second end comprises:
and obtaining the product of the total settling volume of the bed plate at the second end and the relative position relation to obtain the total settling volume of the bed plate at each specified position.
5. The method of claim 1, further comprising:
acquiring the settlement amount triggered by the unit mass at each appointed position;
and generating a unit mass settlement lookup table according to the settlement caused by the unit mass at each specified position.
6. The method of claim 5, wherein obtaining the amount of sedimentation induced per unit mass at each of the designated locations comprises:
placing a bearing object at each appointed position between the first end and the second end, and acquiring the bearing settlement of the bearing object at each appointed position;
acquiring the difference between the bearing settlement of the bearing object at each appointed position and the self-weight settlement of the bed board at the appointed position to obtain the net bearing settlement at each appointed position;
and obtaining the quotient of the net bearing settlement amount at each appointed position and the mass of the bearing object to obtain the settlement amount caused by the unit mass at each appointed position.
7. A multi-modality medical imaging system, comprising:
a CT scanner having a first scanning bore;
a PET scanner having a second scanning aperture, the PET scanner coupled to the CT scanner, the first scanning aperture aligned with the second scanning aperture and having an axial length less than an axial length of the second scanning aperture;
the bed plate is used for bearing a detected body and can move from the second scanning hole cavity to the first scanning hole cavity or from the first scanning hole cavity to the second scanning hole cavity after bearing the detected body;
a processor connected to the CT scanner and/or the PET scanner for acquiring a CT image of the subject, the CT image corresponding to scan data of the subject within the first scan bore; acquiring equivalent mass of the detected body at each appointed position according to the CT image;
acquiring the product of the equivalent mass at each designated position and the settlement caused by the unit mass at each designated position to obtain the settlement of the detected body of the bed board at each designated position;
acquiring the total settlement of the bed board at each specified position according to the settlement of the detected body at each specified position and the self-weight settlement of the bed board at each specified position;
the processor is specifically configured to implement the following operations: acquiring CT values at the designated positions according to the CT images, wherein the CT values are used for representing the density of the examined tissue;
acquiring the weight composition structure of the detected body at each appointed position according to the CT value at each appointed position;
and acquiring the equivalent mass of the detected body at each appointed position according to the weight composition structure of the detected body at each appointed position.
8. The system of claim 7, wherein the processor is further configured to:
transforming the CT image according to the total settlement amount at each designated position to obtain a CT transformed image;
acquiring PET data of the same subject, wherein the PET data correspond to scanning data of the subject in a second scanning cavity;
reconstructing PET data acquires a PET image of a subject, and attenuation correction is performed on the PET image based on the CT transformed image during the PET data reconstruction.
9. A computer-readable storage medium, comprising: computer-executable instructions which, when executed, perform the method of any one of claims 1 to 6.
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