CN111557685B - Calibration assembly and calibration method for calibrating oral CT - Google Patents
Calibration assembly and calibration method for calibrating oral CT Download PDFInfo
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- CN111557685B CN111557685B CN201910115188.7A CN201910115188A CN111557685B CN 111557685 B CN111557685 B CN 111557685B CN 201910115188 A CN201910115188 A CN 201910115188A CN 111557685 B CN111557685 B CN 111557685B
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- 238000000034 method Methods 0.000 title claims description 23
- 239000000523 sample Substances 0.000 claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 210000000214 mouth Anatomy 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 239000000725 suspension Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
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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
- A61B6/58—Testing, adjusting or calibrating apparatus or devices for radiation diagnosis
- A61B6/582—Calibration
Abstract
A calibration assembly for calibrating an oral CT is disclosed. The oral cavity CT comprises an X-ray tube, a detector and a rotating mechanism rotating around the vertical direction. The calibration assembly includes: a rotation axis line light source for emitting a line light whose projection plane includes the rotation axis; the X-ray tube calibration device is attached to the X-ray tube, the outer surface of the X-ray tube is vertical to the direction of an optical axis of the X-ray tube, the outer surface comprises a first horizontal reference line in the horizontal direction and a first vertical reference line in the vertical direction, the intersection point of the first horizontal reference line and the first vertical reference line and the target point position of the X-ray tube are positioned on the same horizontal line, and the first vertical first word line light source is configured to emit first vertical first word line light, the projection plane of which is vertical to the outer surface and contains the first vertical reference line; and a probe calibration device attached to the probe and having an outer surface parallel to a surface of the probe, the outer surface including a probe center mark aligned with a center of a detection area of the probe.
Description
Technical Field
The present application relates to the field of oral CT, and more particularly to a calibration assembly and calibration method for calibrating oral CT.
Background
In oral CT, the accuracy of the spatial relative positions between the X-ray tube, the detector and the rotating mechanism is the basis for the device to be able to perform correct optical path dimension measurement and image acquisition. It is therefore important to ensure that the relative positions are accurate during manufacture and installation of the oral CT and during subsequent use.
Disclosure of Invention
In view of at least one of the above-mentioned technical problems, the present application provides a calibration assembly for calibrating an oral CT and a method of calibrating an oral CT.
According to an aspect of the present application, there is provided a calibration assembly for calibrating an oral CT, the oral CT comprising: an X-ray tube configured to emit X-rays to irradiate a projection body, wherein the X-ray tube is disposed in a horizontal direction; a detector configured to detect X-rays passing through the object to generate data of the X-rays; and a rotation mechanism configured to enable rotation of the X-ray tube and the detector about a vertical axis of rotation about the projection volume, wherein the calibration assembly comprises:
a rotation axis-line light source configured to emit rotation axis-line light having a projection plane containing the rotation axis toward the X-ray tube and the detector;
an X-ray tube calibration device attached to the X-ray tube and having an outer surface facing the detector perpendicular to an optical axis direction of the X-ray tube, the outer surface of the X-ray tube calibration device comprising: a first horizontal reference line in the horizontal direction; a first vertical reference line in the vertical direction, wherein the intersection point of the first horizontal reference line and the first vertical reference line and the target point position of the X-ray tube are on the same horizontal line; a first vertical linear light source configured to emit a first vertical linear light having a projection plane perpendicular to an outer surface of the X-ray tube calibration device and including a first vertical reference line; and a detector calibration device attached to the detector and parallel to the surface of the detector towards the outer surface of the X-ray tube, the outer surface of the detector calibration device comprising: a probe center mark aligned with a center of a detection area of the probe.
According to another aspect of the present application, there is provided a method of calibrating an oral CT, the oral CT comprising: an X-ray tube configured to emit X-rays to irradiate a projection body; a detector configured to detect X-rays passing through the object to generate data of the X-rays; and a rotation mechanism configured to be able to rotate the X-ray tube and the detector around a rotation axis of a vertical direction around the projection body, characterized in that the method comprises:
providing a rotation axis-line light source to emit rotation axis-line light having a projection plane containing the rotation axis toward the X-ray tube and the detector;
providing an X-ray tube calibration device attached to the X-ray tube and having an outer surface facing the detector perpendicular to an optical axis direction of the X-ray tube, comprising on the outer surface: a first horizontal reference line in the horizontal direction; a first vertical reference line in the vertical direction, wherein the intersection point of the first horizontal reference line and the first vertical reference line and the target point position of the X-ray tube are positioned on the same horizontal line; a first vertical line light source configured to emit a first vertical line light having a projection plane perpendicular to an outer surface of the X-ray tube calibration device and including a first vertical reference line;
providing a detector calibration device attached to the detector and parallel to the surface of the detector towards the outer surface of the X-ray tube, comprising on the outer surface of the detector calibration device: a probe center mark aligned with a center of a detection area of the probe;
the method further comprises the following steps:
positioning an X-ray tube in a horizontal direction;
turning on a rotation axis line light source to emit rotation axis line light;
moving the X-ray tube alignment device such that the rotation axis line light coincides with a first vertical reference line;
moving the detector calibration device such that the rotation axis-line light passes through the detector center mark;
turning on a first vertical first word line light source to emit first vertical first word line light;
the X-ray tube calibration device is moved so that the first vertical one-line light passes through the detector center marker.
According to the calibration assembly for calibrating the oral cavity CT and the method for calibrating the oral cavity CT, the calibration of the X-ray tube and the detector in the oral cavity CT can be respectively realized.
Drawings
The above and other aspects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:
fig. 1 shows a schematic structural view of an oral CT according to an exemplary embodiment.
Fig. 2 shows a schematic structural view of an oral CT fitted with a calibration assembly according to an exemplary embodiment.
FIG. 3 is a schematic perspective view of an X-ray tube calibration device according to an exemplary embodiment.
FIG. 4 is a schematic perspective view of a detector calibration apparatus according to an exemplary embodiment.
Detailed Description
The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. Like reference numerals refer to like elements throughout the specification and throughout the drawings.
It will be understood that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements may be present. In contrast, when an element is referred to as being directly on another element, there are no intervening elements present.
It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, including "at least one", unless the content clearly indicates otherwise. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.
Further, spatially relative terms such as "at 8230; \8230, below" or "at 8230; \8230, above" and the like may be used herein to describe the relationship of one element to another element as shown in the figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in one of the figures is turned over, elements described as "below" other elements would then be oriented "above" the other elements. The exemplary terms "below" or "beneath" can therefore encompass both an orientation of above and below.
As used herein, "about" or "approximately" includes the stated value as well as an average value over an acceptable range of deviations for the specified value as determined by one of ordinary skill in the art taking into account ongoing measurements and the error associated with the measurement of the specified quantity (i.e., limitations of the measurement system).
As used herein, a "vertical reference" is located in the vertical direction when a "horizontal reference" is located in the horizontal direction; the projection plane of the vertical line light source is a vertical plane; the projection plane of the horizontal line light source is a horizontal plane; "horizontal movement" means moving the object as a whole in the horizontal direction while keeping the angle of each face of the object constant; "vertically moving" means moving the object as a whole in a vertical direction while keeping the angle of each face of the object constant.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 shows a schematic structural view of an oral CT according to an exemplary embodiment. Fig. 2 shows a schematic structural view of an oral CT fitted with a calibration assembly according to an exemplary embodiment. FIG. 3 is a schematic perspective view of an X-ray tube calibration device according to an exemplary embodiment. Fig. 4 is a schematic perspective view of a detector calibration apparatus according to an exemplary embodiment.
As shown in fig. 1-2, the oral CT may include a whole machine support and fixation beam structure 100, a hollow swivel device 200, a u-shaped rotating arm device 300, an x-ray tube fixation device 400, and a detector fixation device 500. After the supporting and fixing beam structure 100 is set in place, the hollow swing device 200 drives the U-shaped rotation device 300 installed at the lower side to rotate. The overall support and fixed beam structure 100, hollow swivel device 200, and u-turn arm device 300 are referred to herein generally as a swivel mechanism. It should be noted that the calibration assembly and the calibration method according to the present application are not limited to be used in the lower cantilever type oral cavity CT shown in fig. 1, and the lower cantilever type oral cavity CT is shown for illustrative purposes only, and it can also be used in other types of oral cavity CT. For example, the rotary mechanism may also be a floor-standing oral CT.
In the exemplary embodiment shown in fig. 2, hollow swivel device 200 may include a drive motor 201, a motor mounting structure 202, and a rotating arm suspension structure 203. The rotary arm suspension structure 203 may be a high precision cylindrical structure and the upper mounting surface of the U-shaped rotary arm 300 may contain an annular mounting hole that mates with 203.
The X-ray tube fixing device 400 and the detector fixing device 500 are respectively installed at two opposite ends of the U-shaped rotating arm device 300 and are respectively used for installing the X-ray tube and the detector. The X-ray tube fixing device 400 can adjust the mounting position and angle of the X-ray tube, and the detector fixing device 500 can adjust the mounting position and angle of the detector. It should be noted that the X-ray tube fixing device 400 and the detector fixing device 500 are exemplary and only used for illustrating the concept of the present application, and those skilled in the art will understand that the X-ray tube and the detector can be mounted on the rotating mechanism in other manners and achieve the adjustment of the position and angle.
Those skilled in the art will appreciate that the rotation mechanism is typically arranged to rotate about a vertical axis of rotation. In fig. 1, the rotation axis of the hollow swiveling device 200 is located in the vertical direction, and accordingly, the upper and lower surfaces of the U-shaped rotating arm device 300 are located in the horizontal direction, and the X-ray tube fixing device 400 and the detector fixing device 500 extend in the vertical direction. For example, in the exemplary embodiment, after the whole machine supporting and fixing beam structure 100, the hollow swing device 200, and the U-shaped rotating arm device 300 are installed, the whole machine supporting and fixing beam structure 100 and the U-shaped rotating arm device 300 are first adjusted so that the upper surfaces thereof are all in the horizontal direction. Those skilled in the art will appreciate that the specific form of the hollow swiveling device 200, the u-shaped rotating arm device 300, the x-ray tube fixing device 400, and the detector fixing device 500 may be different in different types of oral cavity CT, but the functions and principles thereof are similar in nature and will not be described herein.
As shown in FIG. 2, an X-ray tube 401 has been mounted on the X-ray tube fixture 400 and is configured to emit X-rays for irradiation to a projection subject. A detector 501 has been mounted on the acquisition detector arrangement 500, configured to detect X-rays passing through the object to generate X-ray data. The rotation mechanism is configured to be able to rotate the X-ray tube 401 and the detector 501 around the projection body about the rotation axis 000 in the vertical direction.
According to an exemplary embodiment, the X-ray tube 401 may be a commercially available X-ray tube having an outer surface of a regular rectangular parallelepiped structure, having a target point 403, and having a beam outlet 402. In the exemplary embodiment shown in fig. 2 and 3, the beam outlet 402 has a square structure with 4 mounting holes, the mounting plane of the beam outlet 402 has high precision, and the position of the target point 403 of the X-ray tube is at a specific vertical depth of the geometric center of the 4 mounting holes. It should be noted that the above-described configuration is merely illustrative, and the scope of the present application is not limited thereto. As described above, the X-ray tube fixing device 400 enables adjustment of the position and different angles of the X-ray tube 401 within the xyz three-dimensional coordinate system shown in FIG. 2.
According to an exemplary embodiment, the detector 501 may be a flat panel detector, but it should be noted that this is only for ease of understanding the concept of the present application, and the scope of the present application is not limited thereto. As described above, the acquisition detector fixture 500 enables adjustment of the position and different angles of the detector 501 within the xyz three-dimensional coordinate system shown in fig. 2.
As shown in FIG. 2, a calibration assembly according to an exemplary embodiment can include a rotation axis-line light source 802 configured to emit rotation axis-line light having a projection plane containing a rotation axis 000 toward the X-ray tube 401 and the detector 501. In an exemplary embodiment of the present application, the line light source may be a commercially available line light source, which enables emitting a line laser line along the line light source axially outward for forming a uniform straight line light as a reference line.
In the exemplary embodiment shown in fig. 2, the calibration assembly according to the exemplary embodiment may further include a light source fixing base 801 which may be mounted on a lower surface of the U-shaped rotary arm device 300, and a rotation axis-line light source 802 may be mounted on the light source fixing base 801. As described above, the upper mounting surface of the U-shaped rotating arm 300 may include an annular mounting hole matching with the annular mounting hole 203, and correspondingly, the lower mounting surface of the U-shaped rotating arm 300 may include a mounting hole for mounting the light source fixing base 801, so that after the mounting is completed, the center of the rotating arm 203, the rotation center of the rotating arm 300, and the center of the word line light source fixing base 801 are the same center line (i.e., the rotation axis) 000. The rotation axis-word line light source 802 can be installed in the center of the light source fixing base 801, and the light irradiation direction is perpendicular to the direction of the installation surface of the light source fixing base 801, so that the projection plane of the rotation axis-word line light source 802 emitting the word line light includes the rotation axis 000. Such an arrangement can be done at the time of manufacturing the relevant components, whereby a high degree of accuracy can be achieved. The rotation axis-wordline light source 802 is mounted by providing a wordline light source mounting base 801, which also facilitates mounting both on the U-shaped rotary arm 300 when alignment is required (e.g., during the mounting phase and later maintenance) and removal after completion. However, the scope of the present application is not limited thereto, and the rotation axis-line light source 802 may be mounted on the light source fixing base 801 in other manners (e.g., non-central position) as long as it is possible to realize that the projection plane includes the rotation axis 000 in the vertical direction.
The calibration assembly according to an exemplary embodiment may further include an X-ray tube calibration device 600 attached to the X-ray tube and having an outer surface facing the detector 501 perpendicular to an optical axis direction of the X-ray tube. As shown in FIGS. 2-3, the X-ray tube collimating device 600 according to an exemplary embodiment may be a flat plate member whose plane is parallel to the plane of the X-ray tube 401, i.e., the mounting plane of the beam outlet 402. For example, the inner surface (back surface) of the X-ray tube collimator 600 may be connected to the mounting plane of the beam outlet 402. In the exemplary embodiment shown in FIG. 3, the X-ray tube calibration device 600 is connected to the beam outlet 402 via 4 threaded holes.
The outer surface of the X-ray tube calibration device 600 may include: a first horizontal reference line 604 in the horizontal direction; a first vertical reference line 603 in the vertical direction, wherein an intersection point 605 of the first horizontal reference line 604 and the first vertical reference line 603 is on the same horizontal line with the position of the target point 403 of the X-ray tube; the first vertical line light source 601 is configured to emit first vertical line light with a projection plane perpendicular to the outer surface of the X-ray tube calibration device 600 and including a first vertical reference line 603. In the exemplary embodiment shown in fig. 3, the intersection 605 of the first horizontal reference line 604 and the first vertical reference line 603 coincides with the geometric center of the four threaded holes. The above-described setup of the X-ray tube calibration device 600 can be done, for example, during the manufacturing process. The first vertical first word line light source 601 may be disposed on the first vertical reference line 603 and emit light whose projection plane is a vertical plane and which includes the first vertical reference line 603.
As shown in fig. 2 and 4, the calibration assembly according to an exemplary embodiment may further include a detector calibration device 700 attached to the detector 501 and having an outer surface facing the X-ray tube 401 parallel to a surface of the detector 501. The outer surface of the probe calibration device 700 includes: the center of the probe mark 705 is aligned with the center of the detection area of the probe 501. In the exemplary embodiment shown in fig. 2, the detector calibration device 700 can be sleeved on the periphery of the flat panel detector 501, and the outside plane of the detector calibration device 700 can be ensured to be parallel to the sensor plane (i.e., the outer surface) of the detector 501. In this manner, the probe 501 can be effectively protected and the probe calibration device 700 can be conveniently removed after calibration is completed. The effective detection area of the detector used in the description herein is centered symmetrically about the geometric center of the detector housing, so that the center of the detector calibration apparatus 700 can be aligned with the geometric center of the effective detection area of the detector. If the effective detection area of the detector is not centrosymmetric, the structure of the detector calibration device 700 only needs to be adjusted accordingly. The detector center mark 705 may have any shape, such as a dot, an X-shape, a star shape, etc., and is not limited to the shape shown in fig. 4.
A method of calibrating the X-ray tube 401 by the calibration assembly of the exemplary embodiment will be described below. The method can comprise the following steps:
the X-ray tube 401 is positioned in the horizontal direction. For example, the X-ray tube 401 may be disposed in a horizontal direction using a level (not shown), and specifically, the level may be placed on the top surface of the rectangular parallelepiped housing of the X-ray tube 401 so as to be horizontal, so that the X-ray tube 401 is disposed in the horizontal direction;
the rotation axis-line light source 802 is turned on to emit rotation axis-line light. As can be understood from the above description, the projection plane of the rotation axis-line light source 802 is a vertical plane containing the rotation axis;
the X-ray tube collimator 600 is moved (it will be understood that it is necessary to keep the X-ray tube 401 moving horizontally while moving, e.g., in the direction of a first horizontal reference line 604, or rotating about a vertical axis other than the first vertical reference line, etc.) so that the inline light of the rotation axis coincides with the first vertical reference line 603. At this time, the calibration of the X-ray tube 401 in both the horizontal direction and the vertical direction is completed, but there is also a possibility that the X-ray tube 401 is deflected inward or outward with respect to the reference, for example, the paper surface;
moving the detector calibration apparatus 700 such that the rotation axis-line light passes through the detector center mark 705 (e.g., this can be done in a rotational motion, in a y-axis direction, etc.);
turning on the first vertical first wordline light source 601 to emit first vertical first wordline light;
the X-ray tube collimator 600 is moved (e.g., the X-ray tube collimator 600 is rotated about the first vertical reference line 603 to maintain the rotation axis line light coincident with the first vertical reference line 603 and to maintain the X-ray tube 401 disposed in a horizontal orientation. It should be noted that such movement (and other movements in the other steps given above and below) is a schematic description of the movement of the X-ray tube collimator, and that other variations are within the scope of the present application) so that the first vertical line light passes through the detector center mark 705. Thus, the calibration of the X-ray tube 401 is completed.
It should be noted that in the calibration process above and below, as not otherwise stated, during a step of moving the X-ray tube calibration apparatus 600 or the detector calibration apparatus 700, references (e.g., reference lines, center marks) that have been aligned (e.g., lines coincident, passing through the center mark) prior to that step remain aligned.
It should be noted that the order of some steps of the calibration method according to the exemplary embodiment may be adjusted and is not limited to the illustrated manner.
As shown in FIGS. 3-4, the outer surface of the X-ray tube calibration device 600 may further include: the first horizontal wordline light source 602 is configured to emit a first horizontal wordline light having a projection plane perpendicular to the outer surface of the X-ray tube calibration device 600 and including a first horizontal reference line 604. The first horizontal one-word line light source 602 may be disposed on the first horizontal reference line 604 and emit light whose projection plane is a horizontal plane and includes the first horizontal reference line 604.
The outer surface of the probe calibration device 700 may further include: a second horizontal reference line 704 in the horizontal direction passing through the probe center mark 705; a second vertical reference line 703 in the vertical direction passing through the probe center mark 705; a second vertical inline light source 701 configured to emit a second vertical inline light having a projection plane perpendicular to an outer surface of the detector alignment apparatus 700 and including a second vertical reference line 703.
A calibration method of a calibration assembly according to an exemplary embodiment will be described below, further including:
moving the detector calibration apparatus 700 (e.g., rotating the detector calibration apparatus 700 in the plane of the outer surface of the detector calibration apparatus 700 with the detector center mark 705 as the center of rotation (i.e., keeping the rotation axis-line light passing through the detector center mark 705) such that the rotation axis-line light coincides with the second vertical reference line 703;
the top or bottom surface of the detector alignment device 700 is positioned in the horizontal direction (while maintaining the rotation axis line light coincident with the second vertical reference line 703, as described above). For example, the detector calibration device 700 may be rotated about the second horizontal reference line 704. In an exemplary embodiment, a level may be used to position the top or bottom surface of the sonde calibration apparatus 700 in a horizontal orientation;
turning on the first horizontal one-word line light source 602 to emit first horizontal one-word line light;
the detector calibration device 700 is moved (e.g., the detector calibration device 700 is moved vertically in a vertical direction) such that the first horizontal line light coincides with the second horizontal reference line 704. At this time, the calibration of the probe 501 in both the horizontal direction and the vertical direction is completed, but there is also a possibility that the probe 501 is deflected inward or outward with respect to, for example, the paper surface of the reference;
turning on a second vertical first wordline light source 701 to emit second vertical first wordline light;
the probe calibration device 700 is moved (e.g., the probe calibration device 700 is rotated about the second vertical reference line 703 as an axis of rotation) so that the second vertical inline light coincides with the first vertical reference line 603. Thus, the calibration of the detector 501 is completed.
It should be noted that the order of some steps of the calibration method according to the exemplary embodiment may be adjusted and is not limited to the illustrated manner. For example, according to another exemplary embodiment, the first horizontal one-word line light source 602 may be turned on first during the calibration process to emit the first horizontal one-word line light; moving the detector alignment device 700 (keeping the rotation axis line light coincident with the second vertical reference line 703, e.g., moving in the vertical direction) so that the first horizontal line light coincides with the second horizontal reference line 704; the top or bottom surface of the probe calibration device 700 is then positioned in a horizontal orientation. For example, the detector calibration device 700 may be rotated about the second horizontal reference line 704. In an exemplary embodiment, a level may be used to position the top or bottom surface of the sonde calibration apparatus 700 in a horizontal orientation.
According to certain exemplary embodiments, a second horizontal, one-line light source 702 may also be disposed on the outer surface of the detector calibration device 700, configured to emit a second horizontal, one-line light having a projection plane perpendicular to the outer surface of the detector calibration device 700 and containing a second horizontal reference line 704. Positioning the top or bottom surface of the detector calibration apparatus 700 in a horizontal direction may include: turning on the second horizontal one-word line light source 702 to emit second horizontal one-word line light; and moving the detector calibration device 700 (e.g., rotating the detector calibration device 700 about the second horizontal reference line 704 as an axis of rotation) such that the second horizontal inline light coincides with the first horizontal reference line 604.
While certain exemplary embodiments and examples have been described herein, other embodiments and modifications will be apparent from the above description. Various changes and modifications to the embodiments of the present application may be made by those skilled in the art without departing from the teachings of the present application. The inventive concept is therefore not limited to the embodiments but is to be defined by the appended claims along with their full scope of equivalents.
Claims (6)
1. A calibration assembly to calibrate an oral CT device, the oral CT device comprising: an X-ray tube configured to emit X-rays to irradiate a projection body, wherein the X-ray tube is disposed in a horizontal direction; a detector configured to detect X-rays passing through the object to generate data of the X-rays; and a rotation mechanism configured to enable rotation of the X-ray tube and the detector about a vertical axis of rotation about the projection volume, wherein the calibration assembly comprises:
a rotation axis-line light source configured to emit rotation axis-line light having a projection plane containing the rotation axis toward the X-ray tube and the detector;
an X-ray tube calibration device attached to the X-ray tube and having an outer surface facing the detector perpendicular to an optical axis direction of the X-ray tube, the outer surface of the X-ray tube calibration device comprising: a first horizontal reference line in the horizontal direction; a first vertical reference line in the vertical direction, wherein the intersection point of the first horizontal reference line and the first vertical reference line and the target point position of the X-ray tube are on the same horizontal line; a first vertical line light source configured to emit a first vertical line light having a projection plane perpendicular to an outer surface of the X-ray tube calibration device and including a first vertical reference line; and
a detector calibration device attached to the detector and parallel to a surface of the detector towards an outer surface of the X-ray tube, the outer surface of the detector calibration device comprising: a probe center mark aligned with a center of a detection area of the probe,
wherein the outer surface of the X-ray tube calibration device further comprises: a first horizontal line light source configured to emit a first horizontal line light having a projection plane perpendicular to the outer surface of the X-ray tube calibration device and including a first horizontal reference line,
the outer surface of the probe calibration device further comprises: a second horizontal reference line in the horizontal direction marked through the center of the detector; a second vertical reference line in the vertical direction marked through the center of the detector; a second vertical inline light source configured to emit a second vertical inline light having a projection plane perpendicular to an outer surface of the detector calibration device and including a second vertical reference line,
and wherein the outer surface of the probe calibration device further comprises: and the second horizontal first-line light source is configured to emit second horizontal first-line light, the projection plane of which is vertical to the outer surface of the detector calibration device and contains a second horizontal reference line.
2. The calibration assembly of claim 1, further comprising:
a level configured to dispose the X-ray tube in a horizontal direction.
3. A method of calibrating an oral CT device, the oral CT device comprising: an X-ray tube configured to emit X-rays to irradiate a projection body; a detector configured to detect X-rays passing through the object to generate data of the X-rays; and a rotation mechanism configured to be able to rotate the X-ray tube and the detector around a rotation axis of a vertical direction around the projection body, characterized in that the method comprises:
providing a rotation axis-line light source to emit rotation axis-line light having a projection plane containing the rotation axis toward the X-ray tube and the detector;
providing an X-ray tube calibration device attached to the X-ray tube and oriented with an outer surface of the detector perpendicular to an optical axis direction of the X-ray tube, comprising on the outer surface: a first horizontal reference line in the horizontal direction; a first vertical reference line in the vertical direction, wherein the intersection point of the first horizontal reference line and the first vertical reference line and the target point position of the X-ray tube are positioned on the same horizontal line; a first vertical linear light source configured to emit a first vertical linear light having a projection plane perpendicular to an outer surface of the X-ray tube calibration device and including a first vertical reference line;
providing a detector calibration device attached to the detector and parallel to the surface of the detector towards the outer surface of the X-ray tube, comprising on the outer surface of the detector calibration device: a probe center mark aligned with a center of a detection area of the probe;
the method further comprises the following steps:
positioning an X-ray tube in a horizontal direction;
turning on a rotation axis line light source to emit rotation axis line light;
moving the X-ray tube collimator such that the rotation axis line light coincides with a first vertical reference line;
moving the detector calibration device such that the rotation axis-line light passes through the detector center mark;
turning on a first vertical first word line light source to emit first vertical first word line light;
moving the X-ray tube alignment device so that the first vertical word line light passes through the detector center mark,
wherein, setting up X light pipe calibrating device still includes, sets up on X light pipe calibrating device's surface: a first horizontal-line light source configured to emit a first horizontal-line light having a projection plane perpendicular to an outer surface of the X-ray tube calibration device and including a first horizontal reference line,
setting up detector calibrating device still includes, sets up on detector calibrating device's surface: a second horizontal reference line in the horizontal direction marked through the center of the detector; a second vertical reference line in the vertical direction marked through the center of the detector; a second vertical inline light source configured to emit a second vertical inline light having a projection plane perpendicular to an outer surface of the detector calibration device and including a second vertical reference line,
the method further comprises the following steps:
moving the detector alignment device so that the rotation axis line light coincides with the second vertical reference line;
positioning a top or bottom surface of a detector calibration device in a horizontal direction;
turning on a first horizontal word line light source to emit first horizontal word line light;
moving the detector calibration device so that the first horizontal linear light coincides with the second horizontal reference line;
turning on a second vertical first word line light source to emit second vertical first word line light;
moving the detector-alignment device so that the second vertical inline light coincides with the first vertical reference line,
and wherein positioning the top or bottom surface of the detector calibration device in a horizontal orientation comprises;
positioning the top or bottom surface of the detector calibration device in a horizontal direction using a level; or
A second horizontal first word line light source is arranged on the outer surface of the detector calibration device and configured to emit second horizontal first word line light, the projection plane of which is perpendicular to the outer surface of the detector calibration device and contains a second horizontal reference line; turning on a second horizontal first word line light source to emit second horizontal first word line light; and moving the detector calibration device so that the second horizontal line light coincides with the first horizontal reference line, comprising: and rotating the detector calibration device by taking the second horizontal datum line as a rotating axis so that the second horizontal linear light is superposed with the first horizontal datum line.
4. The method of claim 3, wherein moving the detector alignment device such that the rotation axis line of light coincides with the second vertical reference line comprises:
rotating the probe calibration device in the plane of the outer surface of the probe calibration device with the probe center marked as the center of rotation such that the rotation axis line light coincides with the second vertical reference line.
5. The method of claim 3 wherein moving the X-ray tube collimator such that the rotation axis line light coincides with the first vertical reference line comprises:
the X-ray tube collimator is moved horizontally in the direction of the first horizontal reference line and/or rotated about a vertical axis other than the first vertical reference line such that the rotation axis line light coincides with the first vertical reference line.
6. The method of claim 3, wherein moving the X-ray tube calibration device such that the first vertical first line of line light passes through the detector center mark comprises:
the X-ray tube calibration device is rotated about a first vertical reference line as a rotation axis such that a first vertical word line light passes through the detector center mark.
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| US4296329A (en) * | 1979-10-22 | 1981-10-20 | General Electric Company | Alignment device for computerized tomography phantoms |
| CN105411620A (en) * | 2014-06-17 | 2016-03-23 | 北卡罗来纳大学教堂山分校 | Intraoral tomosynthesis systems, methods and computer readable media for dental imaging |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002036012A1 (en) * | 2000-11-02 | 2002-05-10 | Koninklijke Philips Electronics N.V. | X-ray examination apparatus |
| CA2341105A1 (en) * | 2001-03-21 | 2002-09-21 | Unknown | System and method for detection and removal of dental tartar, e.g. subgingival tartar |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4296329A (en) * | 1979-10-22 | 1981-10-20 | General Electric Company | Alignment device for computerized tomography phantoms |
| CN105411620A (en) * | 2014-06-17 | 2016-03-23 | 北卡罗来纳大学教堂山分校 | Intraoral tomosynthesis systems, methods and computer readable media for dental imaging |
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