CN110353717A - Generate panoramic dental image - Google Patents
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- 238000003384 imaging method Methods 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 27
- 238000003325 tomography Methods 0.000 claims description 20
- 210000002455 dental arch Anatomy 0.000 claims description 19
- 230000005855 radiation Effects 0.000 claims description 12
- 230000000007 visual effect Effects 0.000 claims description 12
- 238000004587 chromatography analysis Methods 0.000 claims 1
- 210000003484 anatomy Anatomy 0.000 description 16
- 238000012545 processing Methods 0.000 description 14
- 230000008859 change Effects 0.000 description 8
- 230000033001 locomotion Effects 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000002224 dissection Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Classifications
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- A61B6/51—
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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
-
- 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]
-
- 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
- A61B6/46—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with special arrangements for interfacing with the operator or the patient
- A61B6/461—Displaying means of special interest
- A61B6/466—Displaying means of special interest adapted to display 3D data
-
- 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
- A61B6/5205—Devices using data or image processing specially adapted for radiation diagnosis involving processing of raw data to produce diagnostic data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T3/00—Geometric image transformation in the plane of the image
- G06T3/40—Scaling the whole image or part thereof
- G06T3/4038—Scaling the whole image or part thereof for image mosaicing, i.e. plane images composed of plane sub-images
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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
- A61B6/44—Constructional features of apparatus for radiation diagnosis
- A61B6/4429—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units
- A61B6/4435—Constructional features of apparatus for radiation diagnosis related to the mounting of source units and detector units the source unit and the detector unit being coupled by a rigid structure
Abstract
The present invention relates to generate panoramic dental image.The present invention relates generally to generate digital dental panoramic picture from the multiple frame images obtained during the dental panoramic image scanning about patients head.The generation includes the position of the X-ray beam and X-ray detector when using photographed frame during the information of aggregate frame and the information of orientation.
Description
It is on December 18th, 2014, application No. is 201480074309.3 that the application, which is the applying date, entitled " to generate
The divisional application of the application for a patent for invention of panoramic dental image ".
Technical field
The present invention relates generally to dental panoramic imagings, more specifically it relates to from the dental panoramic on the head about patient
The multiple frame images obtained during image scanning generate digital dental panoramic picture.
Background technique
The traditional operation principle of panoramic x-ray apparatus includes: to surround patient while film is mobile about X-ray beam
Head driving x-ray source and can so that dental arch will be imaged on film as plane picture.
This basic operation of traditional dental panoramic imaging be included in x-ray source, image information receiver and patient it
Between generate respective mutual movement.Although several possibilities of this movement of presence generation, the most common configuration are, with
The mode for being separated from each other a distance attaches to x-ray source and image information receiver on support arm, and the arm is not then about
Dynamic patient moves in a particular manner.In this case, it is detected in intracorporal desired layer i.e. patients head to obtain
Clear (sharp) image of dental arch layer, the movement speed of film must particularly the sweeping along the desired layer to be imaged with X-ray beam
Firing rate degree is related.By the configuration, the undesirable structure before and after the desired layer in patients head is blurred and invisible.
In traditional panoramic imagery, by the instantaneous centre of rotation of the thickness for the layer clearly taken pictures and support arm to glue
The distance of piece level is directly proportional, is inversely proportional with the width of multiplying power and beam.
The basic form of panoramic imagery can be expressed as follows
V1/v0=L1/L0
V0=ω r
Here,
The distance of point of the L0=from X-ray tube focus F to the subject being imaged in given time；
L1=is from X-ray tube focus F to the distance of X-ray film (detector) plane；
ω=about instantaneous centre of rotation rotary motion angular speed；
Distance of the point of the subject of r=imaging to the instantaneous centre of rotation；And
The speed of picture point in v1=film (detector) plane.
Speed v1 and film move during panoramic imaging scan relative to the X-ray beam being incident on film as a result,
Speed is related.About digital imagery, when using so-called TDI imaging technique (time delay integration), enable through detector
The transmission speed of pixel charge is corresponding with the mobile speed of film.Therefore, it transmits when implementation scan process and charge to defer to
Be completed in the sense that the blurring of the layer outside desired layer and say when the imaging type, the image data read from sensor will with it is complete
Scape film image is corresponding.In this case, since the data read from sensor have represented that layer corresponding with speed v1,
Therefore, it as long as being concerned about the tomography layer shown in selection, even if being able to carry out image procossing after exposure, does not need simultaneously yet
And it not will do it.
The digital panoramic imaging of the prior art further includes so-called FT (frame transmission) technology.When using FT or in image scanning
When period shoots any other technology of several individual overlapping frames, when it is desirable that watch with when defer to be given above it is traditional
When the identical layer of the layer that can be obtained when panoramic imagery formula, the overlapping degree and speed of frame when building should be made to seem clearly layer
It is corresponding to spend v1.
Frame technique bring one is the advantage is that the overlapping degree determination as the frame used in image procossing will be by phase
Therefore other will be blurred of layer to the layer of enhancing after exposition, can be changed to a certain extent by changing overlapping degree
Change layer analyses imaging layer.The degree that can change of layer dependent on frame data how and obtained by what kind of means.
But generally, the limit variation (marginal change) of the only position of layer is possible.
Although also, the frame panorama system of the prior art includes a possibility that marginally changing clear layer, in image
Overlapping degree used in building is based on certain predetermined scheme.These schemes are generally comprised using the standard overlapping of frame and panoramic picture
Practical calculating do not include can and the actual imaging geometry (geometry) at the exposure position of frame of imaging system have
Any parameter closed.
Further, since the view direction of anatomical structure is mainly dominated by the imaging geometry structure for obtaining frame data, i.e.,
The geometry as based on image-forming block (the x-ray source and image information skill device) movement when obtaining frame data dominates, therefore,
The system of the prior art locks into the view direction, the reason is that they, which lack change, shows panoramic picture or their multiple portions
View direction component.
In addition, the frame imaging technique makes although may be in practice compared with when using more conventional continuous scanning technology
Must be able to use broader detector area, but existence rules, such as with can be read fast enough during image scanning
Frame and there is no the related criterion of the necessity of big modification in the multiplying power in single frame, these criterion also will be in practice
Limit the width of detector used in being set as to be imaged in the dental panoramic frame of the prior art.
Summary of the invention
The main purpose of invention and preferred embodiments thereof is to provide a kind of system, can be about each exposure by the system
Position relatively uses with the knowledge of true imaging geometry used in imaging process and obtains in single panoramic imaging scan
The frame image data taken, with provide for after exposition from frame data generate panoramic dental image it is new a possibility that.This hair
The second bright purpose includes that the frame image data for making it possible to not only obtain from single panoramic imaging scan is generated more than one
A tomography layer, but also construct and show the image or parts of images of dental arch viewed from different directions.
Can be reached by the embodiment of the present invention limited in the appended claims will be in invention as discussed below
These and other objects.Core of the invention is panoramic scanning to be realized, so that the information of imaging geometry structure, i.e. detector
With the focus of X-ray tube and therefore the information of the position of X-ray beam and orientation be learned at their exposure position and
The information is then used to calculate panoramic dental image.
The advantages of various embodiments of the present invention provide includes that can generate from single frame data group from more than one side
To viewing panoramic dental image a possibility that.When virtually viewing angle can be changed, from specific other view directions
Sightless anatomical features may become visible.Thus, for example, can be to avoid as needing patient caused by re-shooting image
Exposure again to X-ray.In addition, embodiments discussed below provides use than generally using in dentistry frame panoramic imagery
Detector wide detector a possibility that.
Detailed description of the invention
The present invention and some preferred embodiments will be discussed by referring to accompanying drawing below, wherein
Fig. 1 shows the example of panoramic imaging device,
Fig. 2 indicates for realizing some in the basic element of character of the system of embodiments discussed below,
Fig. 3 A indicates that panoramic dental image, Fig. 3 B indicate therefrom generate among several frame images of panoramic dental image
Single frame image,
Fig. 4 indicates each individual overlapping frame and there are also represent when imaging detector is moved to new exposure position in frame
Different location at project anatomical structure vertical cross section line,
Fig. 5 indicates the exemplary diagram of the principle of the panoramic imagery processing of embodiment according to the present invention,
Fig. 6 indicates the step of applying the method for the principle of the present invention, and
Fig. 7 indicates the schematic diagram that the information processing/computer system hardware that can be used when realizing the present invention is constituted.
Specific embodiment
Referring to the non-limiting embodiment for being shown in the accompanying drawings and being described in detail in the following description, this is more completely explained
In the embodiment that discusses and its various features and advantageous details.The description of well known component and processing technique is omitted, with
Avoid unnecessarily obscuring embodiment here.Example used herein is used for the purpose of being conducive to understand that embodiment here can
The mode of implementation and further such that those skilled in the art can implement embodiment here.Therefore, these examples are not answered
It is interpreted to limit the range of embodiment here.
It should also be understood that embodiment is exemplary.For example, specification somewhere mention "an", "one" or " one
A bit " in the case where embodiment, this, which is not necessarily implied that, should be mentioned that same (with some) embodiments or this feature are only applicable to list
A embodiment.The single feature of different embodiments can be combined to provide other embodiments, even if this is not in given language
It is specifically disclosed in border.
The embodiment of the present invention discussed here uses the X-ray beam and X-ray detector when shooting overlapping frame along dental arch
Position and orientation information, to generate panoramic dental image.For example, embodiments discussed below permission user is from annular region
From the specific focus of more than one view direction viewing dental arch.Therefore, the embodiments described herein allows user's viewing
Such as the special characteristic between the patient teeth in dental panoramic radiograph, these features may be by using existing skills
It is invisible in another dental panoramic radiograph that the method for art and configuration generate.
In the accompanying drawings, Fig. 1 provides the structure of exemplary panorama x-ray imaging device.The device includes matrix 27 and passes through
The cylindrical frame part 12 on matrix 27 is fixed in its lower end.Support arm 13 (its lid is not shown) is rotatably mounted in frame
On the upper end of frame part 12.Correspondingly, being rotatably mounted on the outer end of support arm 13 is another support arm, i.e., intermediate
Support arm 14 is further rotatably mounted the An imaging arm 15 of commonly referred to as C-arm on the outer end of the intermediate supports arm 14.
C-arm 15 supports image-forming block, that is, x-ray source 26 and visual detector 16.Moreover, positioning support 25 is attached to column frame
On frame part 12, to help to position people to be imaged.As the substitution on cylindrical frame part 12, rotatable support arm 13
It can also be installed on wall or ceiling structure.
For the sake of clarity, structure shown in FIG. 1 has been simplified.For example, be not shown in figure as arm configuration 13~
The stressed member of 15 transfer member.Similarly, illustrate in simplified form is electronic for the stepping of swing boom configuration 13~15
Machine 1.
Device shown in FIG. 1 and its control system (not shown in figure 1) provide the rotation center for moving C-arm 15
The example of structure, the C-arm 15 carry image-forming block by using the rail of the substantially any shape of desired rotation center
Mark executes panoramic imaging scan to surround patients head.The structure of dental panoramic imaging device changes, in the simplest case,
Imaging device is allowed with regard to a fixed imaging geometry structure.
Basic module shown in Fig. 2 for realizing system of the invention includes the control system CS of imaging device, the control
System CS processed include drive one or more arms 13~15 of the device motor 1 or with motor 1 and detector 16
Operate electronic device operation connection.The system includes for recording frame image information and about the information in relation to imaging geometry structure
Deng memory M, the processing component IP for creating panoramic picture, show image screen S and user interface UI.
Fig. 3 A indicates typical panoramic dental image 200.When digital panoramic image 200 during panoramic imaging scan by obtaining
When the frame image data building taken, Fig. 3 B can be considered as representing the hundreds of frame image that partly overlaps shot during scanning
One in 300.Fig. 4 then indicate the independent overlapping frame 310,315,320 obtained during panoramic imaging scan how by
For constructing the principle of digital panoramic image 200.The representative of line 210 vertically across frame 310,315,320 includes to be imaged
The position of pixel column in each frame of the image information of the same thin vertical cross section of anatomical structure.The figure that these column include
As information be used to construct the pixel column C of final digital panoramic image 200 discussing in further detail below, being generated.
Do not intersect with line 210 and therefore do not include the information of the specific section of the anatomical structure represented about line 210 before frame 310
The particular column C of the panoramic picture 200 generated will be helpless to the frame shot after frame 320.
Fig. 5 indicates to explain the schematic diagram of the principle of panoramic imagery processing of the invention.The processing uses will be referred to as here
The number of position and orientation of the curve and image-forming block of virtual panoramic curve 400 during exposure in the coordinate system of the curve
According to.In other words, as explained in greater detail below, which includes the position that will represent the tomography layer to be generated
It is placed on the virtual panoramic curve 400 of shape in the coordinate system of the imaging geometry structure used when shooting frame data.
In Fig. 5, several points (P1, P2, P3, P4) are shown on virtual panoramic curve 400, each of these points can
Be considered as with it is corresponding in the position of the section of anatomical structure shown in panoramic picture.In other words, each point (P1, P2 etc.)
Represent the position of the perpendicular layers of the dental arch that be illustrated as single pixel column in the digital panoramic image generated.
Fig. 5 further shows two exposure positions, that is, the position (E ', E ") of x-ray source and detector when exposure, because
This namely runs through the anatomical structure being imaged and the position of the X-ray beam that is incident on detector.When the imaging geometry structure
When known, each point on detector will be determined at each of the exposure position of wherein projection P ' fall on the detector place
The projection P of P ' position.These subpoint P ' determine represent anatomical structure set point PN, to be used to construct panoramic picture
The pixel column on the detector of C is arranged, which can be considered as limiting the projection side of the point P about specific single frame 300
To.
From fig. 5, it can be seen that in the first exposure position E ' in exposure position, the point watched from the focus of radiation source
Projection P ' 2 of P2 fall in the position at the center for being relatively far away from detector on detector (frame), and in second position E ", projection
P " 2 substantially falls in the center of detector.This is that the picture construction processing of the prior art can be by some standard prior defined procedures
The case where being missed when the column of total overlapping frame, and embodiment discussed here makes it possible to actually knowing based on imaging geometry structure
Know the column selected for constructing panoramic picture.In other words, believe as the column for adding up to agreement only to add overlapping frame according to certain standard
The substitution of breath is determined when watching when shooting image from the instantaneous position of the focus of X-ray beam, any specified point P1, P2 etc.
Projection locating for each of frame image the particular column, and specifically make when calculating the column C of the panoramic picture generated
It is arranged with these.
Known imaging geometry structure, that is, the position of x-ray source and detector during image scanning and orientation also become
It can be by the shape or orientation or the two of change panoramic curve 400, not only to calculate the different of anatomical structure in this way
Layer and building and show subject layer viewed from different directions.By considering that the panoramic curve 400 of Fig. 5 will be about point P4's
It slightly rotates counterclockwise, it will be appreciated that this feature of the invention.Consider imaging position E ' and E ", this meeting so that projection P ' 2 and P " 2 more
Towards the left side (from the frame that the focus direction of x-ray source is watched) of detector, therefore, different pixel column informations can be chosen
It selects for constructing panoramic picture.These different column represent shown in Fig. 5 of subject to not only represent different layers
Visual angle other than different perspectives.
In principle, it is possible to use the virtual of any shape in any coordinate system for being orientated and being configured at imaging geometry structure
Panoramic curve 400.Even if this, which allows to construct the very versatile device with Fig. 1, to construct only by the wall of the device
Mechanical Moving creation shape tomography layer.
As the single part viewing vector D that on the other hand, can be determined for any number of point P1, P2 etc..In addition to
Other than Fig. 5 discussion, the desired local view direction of point P2 is also indicated comprising vector D in figure.It is such
Vector D can be used to determine the weighted factor for representing the pixel value of the column of frame of specified point P1, P2 of anatomical structure etc..For example,
From fig. 5, it can be seen that vector D and the projecting direction by being limited since the focus of radiation source and in the line of subpoint P ' end
Between second exposure position E " of the angle in Fig. 5 it is more bigger than in first time exposure position E '.When using such reality
When applying, compared with the pixel value of the column of the subpoint P ' 2 of the first exposure, the relatively small weight in picture construction can be assigned
Give the pixel value of the column of the subpoint P " 2 of the second exposure.When the principle be applied to point P projection P ' when, that is, when than other throwings
When the bigger weight in shadow direction is endowed the pixel value of some projecting direction, the feature for the anatomical structure watched from advantageous direction
It will become to be emphasised.
Process shown in fig. 6 illustrates a preferred method for realizing the principle of the present invention.In the first step of Fig. 6 method
In 500, each exposure position of frame and these frames during reading the panoramic imaging scan of execution.Then, in step 510, obtain
It must be desirably used for the virtual panoramic curve of picture construction, then which is divided into multiple point P in step 520, alternatively, in other words
It says, it, will dissection knot corresponding with the column C of the panoramic picture of generation with restriction from the multiple point P (preferably equidistantly) of the Curve selection
The point of structure.The view single (site) direction D of point P can be determined in step 530.
In practice, in view of the imaging geometry structure of panoramic imaging scan to be used for, preferably people, which know, is designed for
The virtual panoramic curve or multiple curves 400 of picture construction, so that imaging geometry structure can will reasonably generate this hope
One or more layers.
All data are currently available, then can start the column C (step 540) for generating the panoramic picture 200 to be constructed.It is first
First, in step 550, point P corresponding with the column C of panoramic picture is found, also, such as fruit dot P has been determined, then finds related
Local view direction D.Then, due to panoramic curve 400 and radiation source and each position when exposing each frame and be orientated it is known that
Therefore, such a processing (step 560) can be executed to each of frame, that is, firstly, radiating in step 570 along being originated from
The line of the focus of line source projects to point P on frame.In practice, about most of frame, due to being originated from the focus of x-ray source and wearing
Line and the most of frame for crossing the point P on panoramic curve are non-intersecting, and thus, there is no subpoint P ', still, about remaining several
A, restriction is used to construct the pixel column of the particular frame of the column C for the panoramic picture that the point P in discussing is represented by the subpoint P ' on frame
(step 580 and 610).
In the case where the local view direction D of set point P has been determined, processing further includes that part is determined in step 590
Angle between view direction D and the focus from x-ray source and the line intersected with the point P in discussion.The angle can by with
Make the weighted factor in step 600 so that, the projecting direction of point P (alternatively, in other words, referring to Fig. 5, from P to P ' vector)
More deviate desired local view direction D, frame is given in picture construction (step 610) (that is, giving the picture of the subpoint P ' of frame
Element value) weight it is smaller.After completing the processing (step 620), pass through the weighted factor by the value of given column divided by the column
Summation, the pixel value of each column C of final panoramic picture is normalized.
Procedures discussed above can provide in a most general sense with include: using by dental panoramic X-ray at
As several individual overlapping frames 300 that device is shot along dental arch, described device includes for generating X-ray beam and having focal
X-ray source and visual detector with pixel column, frame 300 are by examining around patients head's mobile x-ray source and image
Survey device shooting；Panoramic picture 200 is calculated by the information of aggregate frame 300；And by photographed frame about X-ray beam and
The information of the information aggregate frame 300 of the position and orientation of X-ray detector generates panoramic picture 200.Then, information is total
May include the information of the position and orientation of the X-ray beam and X-ray detector when determining about photographed frame one or more it is uncommon
Hope the position of point P, the information of frame 300 is total comprising adding up to one of panoramic picture 200 about one or more points P as a result,
Or multiple column C.On the other hand, at least two panoramic pictures 200 viewed from different directions be can produce, thus it is possible to simultaneously, according to
It is secondary, as combination image or as moving image, over the display in representing the view (view) of different directions at least
Two images.
One embodiment, which may also include that, generates the virtual panoramic song for representing the tomography layer indicated by panoramic picture 200
The information of the position and orientation of the curve 400 and X-ray beam and X-ray detector is placed in same group of coordinate by line 400；With
And the panoramic picture 200 for representing tomography layer is generated according to position of the curve 400 in this group of coordinate.
Another embodiment can include: generate represent the desired tomography layer indicated by panoramic picture 200, about
The virtual panoramic curve 400 of the information of the position and orientation of X-ray beam and X-ray detector；For the panoramic picture 200 of generation
Column C, determine the hope point P on curve 400；And be projected to by total point P watched from the focus of radiation source
Those of each individual frames 300 column, generate the column C of panoramic picture 200, point of the projection P -> P ' restriction about specific individual frames 300
The projecting direction of P.
About weighted factor, related processing can be provided, to include: to determine desired view direction D at least one point P,
The angle direction limited as a result, based on view direction D and by the line of the focus from radiation source to the point P is to independent
Column count weighted factor on frame 300；Then, when the information of aggregate frame 300, using the weighted factor, so that, it gives
The weight of the column of frame is smaller, then represents the direction vector D of desired view direction and by the burnt point-to-point P from radiation source
Line limit direction between angle it is bigger.
The virtual panoramic curve used in embodiment discussed above can be considered as making it possible to about for getting frame
The imaging geometry structure of data changes the tool of tomography layer in a controlled manner, and it may be additionally used for changing viewing solution
Cut open structure or part thereof of direction.By change virtual panoramic curve shape or orientation or both and even using with
The part viewing direction vector of upper discussion, can be based on the same group of original X-rays frame figure obtained in single panoramic imaging scan
The different images of dental arch are constructed as data.
The virtual panoramic curve 400 for generating panoramic picture can be limited by several different modes.It is a kind of preferred
Mode is, firstly, generating the curve for meeting basic panorama type discussed above for the movement of image-forming block.Due to giving type
Panoramic imaging device in the movement of image-forming block be often fixed, or generally use the shifting of identical several standards
It is dynamic, therefore, panoramic curve 400 corresponding with specific imaging process can be created and stored for using later.In addition, can be such as
The virtual panoramic for using or storing in the past is modified by the means including related view direction and the linear transformation of all the points P
Curve or just used virtual panoramic curve.Linear transformation may include rotation and translation part.Modification may also include and make
With the nonlinear mapping function of such as two-dimensional spline curved surface, can be used for deforming panoramic curve.
Note that the embodiment of the present invention includes novel mode, which not only creates panoramic dental image in this way, and
And them are showed over the display.For example, the position of X-ray beam and X-ray detector when photographed frame and the information of orientation
It, can aggregate frame be believed in different ways by the information of position and orientation about X-ray beam and X-ray detector when available
Breath, generate two or more panoramic pictures viewed from different directions, this make it possible to again for example simultaneously, successively, as group
It closes image or shows image viewed from different directions over the display as moving image.
For example, can produce the information of the position and orientation about X-ray beam and X-ray detector first and second are virtual
Panoramic curve, the two curves represent the desired layer indicated by panoramic picture, and the second curve is by changing the first curve
Orientation and from the first curve generate, then, can be aggregated in by the curve different about these panoramic imagery processing in obtain
The information of the frame taken calculates two panoramic pictures.Of course, it is possible to using more than two curve, for example, can be by successively showing
Change the panoramic picture of view direction to generate the illusion of rotation dental arch.In other words, such embodiment may include root
Image is successively presented over the display according to the order of the view direction of image, with the feeling rotated over the display to people's dental arch.
Another embodiment can include: generate several panoramic pictures viewed from different directions；For each this viewing side
To generation represents several images of different clear layer；Then, it for each this view direction, may be selected to represent different clear
One in several images of clear layer is to represent the view direction, later, referring to more than, for example, can simultaneously, successively, conduct
The image selected in this way is presented as moving image over the display for combination image.
Using weighted factor discussed above can by given point P according to the viewing angle of panoramic curve more
Emphasize the column with main X-ray travel path to enhance different viewing angles.
Using weighted factor in the detector surface wide using the detector surface than being usually used in the application of dentistry frame panorama
A possibility that aspect it is also helpful.When total overlay process based on some standard of the frame data of the prior art, it is more likely to
So that the column being combined togather do not represent the same section of anatomical structure, further off the center of detector.This is because total association
Discuss the overall imaging geometry structure shear really during not knowing exposure-processed, that is, image-forming block and the layer for wishing to generate
The variation of mutual alignment and orientation.But when using principle discussed here, the dissection knot due to changing to representative can avoid
Panoramic picture caused by the column C addition information of the panoramic picture 200 of structure position obscures.Weighted factor may be alternatively used for compensation and change
Zoom rate.
About the embodiment of the present invention, a kind of possibility for generating the illusion of the anatomical structure of rotation imaging is to be used only
One virtual panoramic curve, however it is based on it, sexually revise the part viewing direction vector D's of point P discussed above by system
Orientation is to generate various panoramic pictures.Generally, it is clear that, it is contemplated that based on the frame number obtained in single panoramic imaging scan
The scope of the present invention according to the anatomical structure of display imaging includes modifying the local direction vector D of virtual panoramic curve 400 and point P
Orientation any combination, including only modify selection quantity vector D, to show the different layers of anatomical structure with different view,
Or it shows the different layers of anatomical structure or shows the layer of anatomical structure with different view.
Embodiment discussed here makes it possible to use dental panoramic to the dentistry frame panoramic imagery for realizing embodiment
Imaging device, the dental panoramic imaging device include: the focal x-ray source of tool and the image detection with several pixel columns
Device, the x-ray source and described image detector are configured on device in a manner of being separated from each other first distance；For surrounding
The driving part of patients head's mobile x-ray source and detector；Comprising for controlling the device with several individually along dental arch shooting
Overlapping frame component control system.Detector can be realized to be wider or wider than second distance, also, control system is matched
It sets for controlling the device to shoot the frame that width is equal to second distance, second distance is about the 2~10% of the first distance.
In one embodiment, the distance between x-ray source and visual detector are preferably about 500~550mm.
As described above, embodiment discussed here, which also may make, can show and cannot otherwise make visible dissection
Structure, at least cannot in the case where not carrying out another panoramic exposure processing to patient.When visual angle can be changed, the solution of imaging
The details for cuing open structure can become as it can be seen that and otherwise they can be sightless.For example, tooth filling may interfere to make
Obtaining the tooth of the another side of dental arch will enable to such tooth visible eventually as it can be seen that still changing view direction.
Fig. 7 shows the signal that information processing/computer system hardware of achievable the embodiment of the present invention is constituted
Figure.The system 1000 of Fig. 7 includes at least one processor or central processing unit (CPU) 1010.CPU 1010 is total by system
Line 1012 and such as random access memory (RAM) 1014, read-only memory (ROM) 1016 and input/output (I/O) adapter
1018 various apparatus interconnections.I/O adapter 1018 can be with the peripheral hardware of such as disk unit 1011 and tape drive 1013 or can
The program storage device connection read by system 1000.Invention of the invention in 1000 readable medium of system storage equipment refers to
The method of order and the embodiment in accordance with these instruction executions here.System further includes connection keyboard 1015, mouse 1017, loudspeaking
Device 1024, other user interface facilities of microphone 1022 and/or such as touch panel device (not shown) and bus 1012 are to receive
Collect the user interface adapter 1019 of user's input.In addition, communication adapter 1020 connects bus 1012 and data processing network
1025, also, for example, display adapter 1021 connects bus 1012 and can be presented as such as monitor, printer or transmitter
Output equipment display equipment 1023.
Therefore, another embodiment includes dental panoramic imaging device, which includes: that tool is focal
X-ray source and visual detector with several pixel columns, the x-ray source and described image detector are to be separated from each other one section
The mode of distance is configured on device；For surrounding the driving part of patients head's mobile x-ray source and detector；Include use
The control system of the component of several individual overlapping frames is shot along dental arch in the control device；With for the control system
The user interface of control command is sent, position and the orientation of x-ray source and X-ray detector when control system includes photographed frame
Record information and for calculating panoramic picture by the information about the information aggregate frame to generate from least two
The component of the panoramic picture of a different direction viewing, user interface includes for providing and showing from least two different directions
The component of at least one related control command of at least two panoramic pictures of viewing.
The dental panoramic imaging device of structure feature with the above paragraph may also used as including according to discussed here
The control system and/or image procossing of any embodiment or other feature related with obtaining and constructing image.
The description of above specific embodiment is by comprehensive general essence for disclosing the embodiments herein, so that other people can
By being easy to modify these specific embodiments using current knowledge and/or making without departing substantially from universal
They are suitable for various applications, and therefore, this be applicable in and modify should and will be in the equivalent meaning and model of disclosed embodiment
It is appreciated in enclosing.It should be appreciated that word used herein and term are the purposes for description rather than limited.Therefore, although
Embodiment here is described about preferred embodiment, but it will be appreciated by those skilled in the art that in the attached claims
Spirit and scope in, can be modified to implement the embodiments herein.
Claims (23)
1. a kind of method for generating digital dental panoramic picture, comprising:
Use several individual overlapping frames (300) shot by dental panoramic x-ray imaging device along dental arch, described device
Include:
For generating X-ray beam and having focal x-ray source；With
Visual detector with pixel column,
Also, the frame (300) is by shooting around patients head's mobile x-ray source and visual detector；And
Panoramic picture (200) are calculated by the information of aggregate frame (300),
Wherein,
Panoramic picture (200) is by the information about the position and orientation of X-ray beam and X-ray detector in photographed frame
The information of aggregate frame (300) and generate.
2. according to the method described in claim 1, wherein, one or more wish point P about in photographed frame X-ray beam with
The position of the information of the position and orientation of X-ray detector is determined, also, total packet of the information of frame (200)
Containing the one or more column C for adding up to panoramic picture (200) about one or more of hope point P.
3. method according to claim 1 or 2, wherein
Generate the virtual panoramic curve (400) for representing the tomography layer to be showed by panoramic picture (200), the curve
(400) and the information of the position and orientation of X-ray beam and X-ray detector is placed in same group of coordinate, and
According to position of the curve (400) in one group of coordinate, the panoramic picture for representing tomography layer is generated
(200)。
4. method described according to claim 1~any one of 3, wherein
Generate represent will by the desired tomography layer that panoramic picture (200) show, examine about X-ray beam and X-ray
The virtual panoramic curve (400) of the position of device and the information of orientation is surveyed,
For the column C of the panoramic picture (200) of generation, the hope point P on the curve (400) is determined, and
By those of total point P watched from the focus of radiation source individual frame (300) being projected to column, generate complete
The column C of scape image (200), projecting direction of the projection P -> P ' restriction about the point P of specific individual frames (300).
5. the method according to any one of claim 2~4, wherein
Desired view direction D is determined at least one point P, also, based on view direction D and by the focus from radiation source
To the angle between the direction of the line restriction of the point P to the column count weighted factor on individual frame (300), and
When the information of aggregate frame (300), using the weighted factor, so that, the weight for giving the column of frame is smaller,
Then represent the direction vector D of desired view direction and the side limited by the line of the focus from radiation source to the point P
Angle between is bigger.
6. according to the method described in claim 5, wherein, pass through the weighted factor by the pixel value of given column C divided by the column
Summation, to normalize the pixel value for arranging C of final panoramic picture (200).
7. a kind of method for generating and presenting digital dental panoramic picture, comprising:
Use several individual overlapping frames (300) shot by dental panoramic x-ray imaging device along dental arch, described device
Include:
For generating X-ray beam and having focal x-ray source；
Visual detector with pixel column；And
The display being connect with described device functionality,
Also, the frame (300) is by shooting around patients head's mobile x-ray source and visual detector；
Panoramic picture (200) are calculated by the information of aggregate frame (300), and
The panoramic picture (200) of the tomography layer so generated is presented over the display,
Wherein,
At least two panoramic pictures (200) viewed from different directions are generated, and
Simultaneously, successively, as combination image or as moving image, over the display in representing from different directions
At least two image of view.
8. according to the method described in claim 7, wherein, the generation of at least two panoramic pictures (200) include about
The information of the position and orientation of X-ray beam and X-ray detector is total described by least two different modes when photographed frame
The information of frame (300).
9. method according to claim 7 or 8, wherein at least two panoramic picture (200) is according to their viewing
The order in direction is successively presented over the display, to provide the feeling that dental arch rotates over the display.
10. according to the method described in claim 9, wherein,
Several panoramic pictures (200) viewed from different directions are generated,
For each this view direction, several images for representing different tomography layers are generated,
For each this view direction, selection represents one in several images of different chromatography imaging layers, with generation
View direction described in table, and
The image so selected is presented over the display.
11. the method according to any one of claim 8~10, wherein one or more wishes point P about shooting
The position of the information of the position and orientation of X-ray beam and X-ray detector is determined when frame, also, the information of frame (200)
Total one or more column C comprising adding up to panoramic picture (200) about one or more of point P.
12. the method according to any one of claim 7~11, wherein
Generate the virtual panoramic curve (400) for representing the tomography layer to show in panoramic picture (200), the curve
(400) and the information of the position and orientation of X-ray beam and X-ray detector is placed in same group of coordinate, and
By the information about the curve (400) aggregate frame (300), generate it is viewed from different directions it is described at least
Two panoramic pictures (200) make so that curve (400) is arranged in one group of coordinate along at least first and second orientations
Each of these orientations must be paid close attention to,
For the column C of the panoramic picture (200) of generation, the point P on the curve (400) is determined, and
By those of total point P watched from the focus of radiation source individual frame (300) being projected to column, generate complete
The column C of scape image (200), projecting direction of the projection P -> P ' restriction about the point P of specific individual frames (300).
13. a kind of dental panoramic imaging device, comprising:
Have focal x-ray source (26) and a visual detector (16) with several pixel columns, the x-ray source (26) and
Described image detector (16) is configured on the device in a manner of being separated from each other a distance；
For the driving part (1) around patients head's mobile x-ray source (26) and detector (16)；
Comprising for controlling the device to shoot the control system CS of the component of several individual overlapping frames (300) along dental arch；
And
For sending the user interface UI of control command to the control system, wherein
The position and orientation of x-ray source (26) and X-ray detector (16) when control system CS is included in photographed frame (300)
Information and for by calculating panoramic picture (200) about the information of the position and the information aggregate frame (300) of orientation
To generate the component IP for the panoramic picture (200) watched from least two different directions, and
User interface UI includes for providing and showing at least two panorama sketch watched from least two different directions
As the component of (200) at least one related control command.
14. device according to claim 13, wherein the control system CS include for simultaneously, successively, as combination
Image shows the component for representing at least two image (200) of the view from different directions as moving image.
15. device described in 3 or 14 according to claim 1, wherein the control system CS includes for according to described image
(200) described image (200) is presented successively to give the component of the feeling of rotation dental arch in the order of view direction.
16. device described in any one of 3~15 according to claim 1, wherein the control system CS is comprised mean for
About x-ray source (26) and the position of X-ray detector (16) at photographed frame (300) and the information of orientation at least two not
With the information of mode aggregate frame (300) generate the component IP of at least two panoramic picture (200).
17. device described in any one of 3~15 according to claim 1, wherein for calculating the institute of panoramic picture (200)
Stating component IP includes about the information aggregate frame (300) of the position and orientation of X-ray beam and X-ray detector in photographed frame
The component of information.
18. device according to claim 17, wherein the component IP for calculating panoramic picture (200) includes to use
In generate the virtual panoramic curve (400) for representing the tomography layer to be showed by panoramic picture (200), by the curve (400)
And the information of the position and orientation of X-ray beam and X-ray detector is placed in same group of coordinate and according to the song
Position of the line (400) in one group of coordinate generates the component for representing the panoramic picture (200) of tomography layer.
19. device described in 7 or 18 according to claim 1, wherein the component IP for calculating includes for generating representative
The desired tomography layer to be showed by panoramic picture (200), about X-ray beam and X-ray detector position and take
To the information virtual panoramic curve (400), the column C of the panoramic picture 200 of generation is determined on the curve (400)
Hope point P and those of the individual frame (300) that is projected to by total point P watched from the focus of radiation source
It arranges to generate the component of the column C of panoramic picture (200), point P of the projection P -> P ' restriction about specific individual frame (300)
Projecting direction.
20. a kind of dental panoramic imaging device, comprising:
Have focal x-ray source (26) and a visual detector (16) with several pixel columns, the x-ray source (26) and
Described image detector (16) is arranged on device in a manner of being separated from each other first distance；
For the driving part (1) around patients head's mobile x-ray source (26) and detector (16)；
Comprising for controlling the device to shoot the control system CS of the component of several individual overlapping frames (300) along dental arch；
Wherein,
The position and orientation of x-ray source (26) and X-ray detector (16) when control system CS is included in photographed frame (300)
Information and for by calculating panoramic picture (200) about the information of the position and the information aggregate frame (300) of orientation
Component IP,
The detector (16) is implemented as wider or wider than second distance, and
The control system is configured as control imaging device to shoot the frame (300) that width is equal to second distance, and described the
Two distances are about the 2~10% of the first distance.
21. device according to claim 20, wherein first distance is about 500~550mm.
22. the device according to claim 21 or 22, wherein for calculating the component IP packet of panoramic picture (200)
Containing for generates represent will by the virtual panoramic curve (400) of the tomography layer of panoramic picture (200) performance, by the curve
(400) and the information of the position and orientation of X-ray beam and X-ray detector be placed in same group of coordinate and according to
Position of the curve (400) in one group of coordinate generates the component for representing the panoramic picture (200) of tomography layer.
23. device according to claim 22, wherein the component IP for calculating includes that represent will be by for generating
It is the desired tomography layer of panoramic picture (200) performance, position and orientation about X-ray beam and X-ray detector
The virtual panoramic curve (400) of the information determines on the curve (400) the column C of the panoramic picture (200) of generation
Wish point P and by those of total point P watched from the focus of radiation source individual frame (300) being projected to column
To generate the component for arranging C of panoramic picture (200), throwing of the projection P -> P ' restriction about the point P of specific individual frame (300)
Shadow direction.
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| FI20130379A FI125761B (en) | 2013-12-18 | 2013-12-18 | Generating panoramic images of a tooth |
| CN201480074309.3A CN105934201B (en) | 2013-12-18 | 2014-12-18 | Generate panoramic dental image |
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| CN201480074309.3A Division CN105934201B (en) | 2013-12-18 | 2014-12-18 | Generate panoramic dental image |
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| CN201480074309.3A Expired - Fee Related CN105934201B (en) | 2013-12-18 | 2014-12-18 | Generate panoramic dental image |
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| JP (1) | JP6595480B2 (en) |
| KR (1) | KR20160098408A (en) |
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| KR101740852B1 (en) | 2016-02-04 | 2017-06-09 | (주)제노레이 | X-ray imaging machine, method for generating panorama image using the same and method for generating panorama image |
| WO2017135532A1 (en) | 2016-02-04 | 2017-08-10 | (주)제노레이 | X-ray imaging device and panoramic image creation method using x-ray imaging device |
| KR101740851B1 (en) | 2016-02-04 | 2017-06-09 | (주)제노레이 | X-ray imaging machine, method for generating panorama image using the same |
| KR101740850B1 (en) | 2016-02-04 | 2017-06-09 | (주)제노레이 | X-ray imaging machine, method for generating panorama image using the same |
| KR101880150B1 (en) * | 2016-09-06 | 2018-07-19 | 오스템임플란트 주식회사 | Method and apparatus for generating panoramic image, panoramic x-ray imaging apparatus, computer-readable recording medium and computer program |
| CN107566757A (en) * | 2017-08-25 | 2018-01-09 | 包谦 | A kind of preparation method of panoramic video |
| CN109377534B (en) * | 2018-10-22 | 2022-04-26 | 南方医科大学 | Nonlinear oral cavity CT panoramic image synthesis method capable of automatically sampling thickness detection |
| CN111833244A (en) * | 2019-04-11 | 2020-10-27 | 深圳市深图医学影像设备有限公司 | Dental panoramic image generation method and device and computer readable storage medium |
| EP3730057B1 (en) | 2019-04-26 | 2022-12-28 | Sirona Dental Systems GmbH | Method and apparatus for generating a panoramic layer image |
| KR102292080B1 (en) | 2019-11-07 | 2021-08-20 | 부산대학교 산학협력단 | Individualized Dental Panorama System using Arch Shape and Method for Controlling the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| FI125761B (en) | 2016-02-15 |
| FI20130379A (en) | 2015-06-19 |
| KR20160098408A (en) | 2016-08-18 |
| CN105934201B (en) | 2019-08-27 |
| WO2015092119A1 (en) | 2015-06-25 |
| CN105934201A (en) | 2016-09-07 |
| JP6595480B2 (en) | 2019-10-23 |
| RU2677830C1 (en) | 2019-01-21 |
| EP3082609A4 (en) | 2018-05-09 |
| EP3082609A1 (en) | 2016-10-26 |
| JP2016540600A (en) | 2016-12-28 |
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Application publication date: 20191022 |