CN204016321U - Collimator after a kind of variable cross-section CT equipment - Google Patents
Collimator after a kind of variable cross-section CT equipment Download PDFInfo
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- CN204016321U CN204016321U CN201420387620.0U CN201420387620U CN204016321U CN 204016321 U CN204016321 U CN 204016321U CN 201420387620 U CN201420387620 U CN 201420387620U CN 204016321 U CN204016321 U CN 204016321U
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Abstract
Collimator after a kind of variable cross-section CT equipment, it include several arrangement X to channel mask sheet and with X several Y-direction channel mask sheets to the cross arrangement of channel mask sheet, retainer is connected with to the two ends of channel mask sheet at this X, described X becomes large gradually to the contour from top to bottom cross section of channel mask sheet and Y-direction channel mask sheet, form X to broaden gradually downwards to the width on the top of channel mask sheet and Y-direction channel mask sheet, the width of bottom is maximum, forms the variable cross-section of X to channel mask sheet and Y-direction channel mask sheet.Described X is fan-shaped to the shape of channel mask sheet, and Y-direction channel mask sheet is formed and oliquely downward become dispersion shape gradually from center.This utility model beneficial effect is: the invalid receiver district 1, reducing crystal, improves the utilization rate of crystal.2, reduce the impact because focal shift produces signal, improve stability and the picture quality of acquired signal.3, the radiation dose brought by the invalid ray of patient is decreased.
Description
Technical field
This utility model relates to CT equipment technical field, belongs to collimator after a kind of variable cross-section CT equipment.
Background technology
After CT equipment, collimator is generally installed on the position of the top of detector crystal the upper surface close to crystal.Its effect is for the X-ray of transmission marks off the passage consistent with receiving crystal, and shields scattered rays.Rear collimator is made up of (as shown in Figure 1) retainer and some channel mask sheets (leaf or other shield type materials).Channel mask sheet is according to design interval and angular distribution and be fixed in retainer, and smectic body end thickness (as shown in Figure 3) of shielding sheet and highly (as shown in Figure 3) are determined by Image chain parameter.
The shielding sheet generally adopted at present, it is the shape of square-section shielding sheet 9, i.e. cross section thickness equal (as shown in Figure 3) everywhere.In production, retainer position is fixed, more each shielding sheet is inserted in retainer slot 8 respectively, and in the slot 8 of retainer, add glue fixed mask sheet (Jia Jiao district as shown in Figure 1).The shielding sheet production technology of square-section is simple, but there are the following problems in the application.
1., when skew does not occur focus (focus is at theoretical position), when ray arrives receiving crystal by shielding sheet, can produce an invalid receiver district a1, if shown in Fig. 4, the a1 reception area namely on crystal cannot be used effectively.It reduce the utilization rate of crystal, add the radiation dose of invalid ray to patient.
2., in practical application, there is small side-play amount along with factors such as temperature in Focus Club.After focus offsets, when ray arrives receiving crystal by shielding sheet, an invalid receiver district a2 can be produced, if shown in Fig. 5, when shield sheet thickness and highly constant, invalid receiver district a2 is now greater than a1, namely after focus offsets, under extreme case, the exposed area of crystal can change, and it is larger that invalid receiver district becomes, the signal that now crystal produces has very big error, affects picture quality.The invalid ray of increase that simultaneously can be larger is to the radiation dose of patient.
Utility model content
The purpose of this utility model is to provide collimator after a kind of variable cross-section CT equipment, and it can increase the receiving area of crystal, improves its utilization rate, and reduces the impact because focal shift produces signal, reduces the radiation dose of invalid ray to patient simultaneously.
For achieving the above object, this utility model takes following technical scheme:
Collimator after a kind of variable cross-section CT equipment, it include several arrangement X to channel mask sheet (1) and with X several Y-direction channel mask sheets (2) to the cross arrangement of channel mask sheet, retainer (3) is connected with to the two ends of channel mask sheet (1) at this X, it is characterized in that: described X becomes large gradually to the contour from top to bottom cross section of channel mask sheet and Y-direction channel mask sheet, form X to broaden gradually downwards to the width on the top of channel mask sheet and Y-direction channel mask sheet, the width of bottom is maximum, form the variable cross-section of X to channel mask sheet and Y-direction channel mask sheet.
Described X is fan-shaped to the shape of channel mask sheet, and X forms downward concave arc respectively to the limit, upper end of channel mask sheet and limit, lower end, and Y-direction channel mask sheet is formed and oliquely downward become dispersion shape gradually from center.Adopt 3D printing technique to carry out entirety to print.
X, to Y-direction channel mask sheet slot (4) of channel mask sheet, is formed outward-dipping gradually to the slot of arranged on both sides from center, the Y-direction channel mask sheet of insertion slot is formed from center, oliquely downward becomes dispersion shape gradually.Adopt ordinary skill to carry out grafting to complete.
Described X starts to channel mask Pian Cong center to be formed to arranged on both sides to be oliquely downward inclined to dispersion shape gradually.
As preferably, described X is triangle to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
As preferably, described X is antiparallelogram to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
As preferably, described X is multistage rectangle to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
The beneficial effects of the utility model are:
1, reduce the invalid receiver district of crystal, improve the utilization rate of crystal.
2, reduce the impact because focal shift produces signal, improve stability and the picture quality of acquired signal
3, the radiation dose brought by the invalid ray of patient is decreased
Accompanying drawing explanation
Fig. 1 is collimator perspective view after existing two-dimensional ct equipment.
Fig. 2 is the planar structure schematic diagram of Fig. 1.
Fig. 3 is A-A section structure for amplifying schematic diagram in Fig. 2.
Fig. 4 is that the focus in rectangular shield sheet invalid receiver district is without invalid receiver district a1 schematic diagram during skew.
Fig. 5 is the invalid receiver district a2 schematic diagram after the focal shift in rectangular shield sheet invalid receiver district.
Fig. 6 be the focal shift in the invalid receiver district of trapezoidal shielding sheet maximum time invalid receiver district b2 schematic diagram.
Fig. 7 is that the focus in the invalid receiver district of trapezoidal shielding sheet is without invalid receiver district b1 schematic diagram during skew.
Fig. 8 is schematic perspective view after X combines to channel mask sheet and the mutual grafting of Y-direction channel mask sheet.
Fig. 9 be in Fig. 8 X to the schematic diagram of channel mask sheet.
Figure 10 is that schematic diagram is looked on Fig. 9 left side.
Figure 11 is Fig. 9 schematic top plan view.
Figure 12 is 9B-B structure for amplifying schematic diagram in figure.
Figure 13 be X to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet be multistage square-section schematic diagram.
Figure 14 be X to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet be triangular-section schematic diagram.
Drawing reference numeral: 1, X is to channel mask sheet; 2, Y-direction channel mask sheet; 3, retainer; 4, slot; 5, trapezoid cross section; 6, multistage square-section; 7, triangular-section; 8, retainer slot; 9, square-section shielding sheet.
Detailed description of the invention
See shown in Fig. 1 to Figure 14:
1. determine collimator population structure: be applied in the rear collimator structure of two dimension by monoblock type variable cross-section shielding sheet herein, therefore embodiment is for collimator after two dimension, as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 8, wherein X is the coordinate describing collimator after two dimension herein to, Y-direction.After two dimension in collimator, the X of monoblock type variable cross-section shielding sheet is variable cross-section shielding sheet to channel mask sheet 1, Y-direction channel mask sheet 2.
2. determine shielding sheet thickness and height: according to the Image chain parameter of CT system, at X to in Y-direction, determine the thickness T and the height H that shield sheet smectic body end respectively, as shown in Figure 6.
3. determine cross sectional shape: herein, X to, Y-direction all adopts trapezoid cross section 5 (see Fig. 6, Fig. 7) on the thickness direction of shielding sheet, because trapezoid cross section 5 can increase the receiving area of crystal greatly, and reduces the radiation dose of invalid ray to patient.X on channel mask sheet 1 thickness x cross sectional close to the large limit (base) that crystal end is trapezoidal, as shown in Figure 6; Equally, close to the large limit (base) that crystal end is trapezoidal on Y-direction channel mask sheet 2 thickness x cross sectional, as shown in Figure 6.
4. determine trapezoidal angle: when shielding smectic body end thickness T (trapezoidal base) of sheet and height H is certain, can determine respectively as follows X to Y-direction on shield trapezoidal angle α on sheet thickness direction cross section, see Fig. 6, F is the position that focus does not occur when offseting, F1 is the position of focus generation maximum offset, A, B is respectively two end points of smectic body end on shielding sheet thickness direction, the line of F1 and A point and the angle of centrage are β, make trapezoidal angle α=β, trapezoidal angle can be determined thus.Now, the invalid receiver district namely during focus generation peak excursion is b2, as shown in Figure 6.According to the shielding plate shape determined above, if focus does not offset, then the invalid receiver district on crystal is b1, as shown in Figure 7.Common rectangular shield sheet (see Fig. 4, Fig. 5), if focus does not offset, invalid receiver district then on crystal is that (left side of invalid receiver district a1 is effective region of acceptance to a1, invalid receiver district is larger, effective receive zone is less), invalid receiver district during focus generation peak excursion is a2, can judge b1 < b2 < a1 < a2 from Fig. 4, Fig. 5, Fig. 6, Fig. 7.Visible, after adopting trapezoidal shielding sheet, the invalid receiver district on crystal obviously diminishes, and this is conducive to reducing signal errors, improves signal stabilization type.
5. according to the X determined above to, the concrete shape of Y-direction channel mask sheet and size, adopt 3D metallic print technique (laser sintered), tungsten alloy powder (also can be other raw materials having X-ray shield property and be suitable for 3D metallic print) is manufactured the required two-dimensional integrated formula shielding sheet with trapezoidal variable cross-section, as shown in Fig. 8 to Figure 12.
6. identical with shown in Fig. 1, adopt common grafting technology, the two-dimensional integrated formula variable cross-section manufactured shielding sheet is assembled in retainer slot 8, and adds glue and fix, collimator after the two dimension of employing monoblock type variable cross-section as herein described shielding sheet can be obtained.
7. also can adopt ordinary skill by X to channel mask sheet 1 and the mutual grafting of Y-direction channel mask sheet 2, make overall variable cross-section shielding sheet, then be plugged in retainer slot 8, and add glue and fix, collimator after the two dimension of the variable cross-section shielding sheet of entirety as herein described can be obtained.
Collimator after a kind of variable cross-section CT equipment of the application, it include several arrangement X to channel mask sheet 1 and with X several Y-direction channel mask sheets 2 to the cross arrangement of channel mask sheet, retainer 3 is connected with to the two ends of channel mask sheet 1 at this X, described X becomes large gradually to the contour from top to bottom cross section of channel mask sheet and Y-direction channel mask sheet, form X to broaden gradually downwards to the width on the top of channel mask sheet and Y-direction channel mask sheet, the width of bottom is maximum, forms the variable cross-section of X to channel mask sheet and Y-direction channel mask sheet.
Described X is fan-shaped to the shape of channel mask sheet, and X forms downward concave arc respectively to the limit, upper end of channel mask sheet and limit, lower end, and Y-direction channel mask sheet is formed and oliquely downward become dispersion shape gradually from center.Adopt 3D printing technique to carry out entirety to print.
X, to the Y-direction channel mask sheet slot 4 of channel mask sheet, is formed outward-dipping gradually to the slot of arranged on both sides from center, the Y-direction channel mask sheet of insertion slot is formed from center, oliquely downward becomes dispersion shape gradually.Adopt ordinary skill to carry out grafting to complete.
Described X starts to channel mask Pian Cong center to be formed to arranged on both sides to be oliquely downward inclined to dispersion shape gradually.
As preferably, described X is triangle to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
As preferably, described X is antiparallelogram to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
As preferably, described X is multistage rectangle to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
The above know-why being preferred embodiment of the present utility model and using; for a person skilled in the art; when not deviating from spirit and scope of the present utility model; any based on apparent changes such as the equivalent transformation on technical solutions of the utility model basis, simple replacements, all belong within this utility model protection domain.
Claims (7)
1. collimator after a variable cross-section CT equipment, it include several arrangement X to channel mask sheet (1) and with X several Y-direction channel mask sheets (2) to the cross arrangement of channel mask sheet, retainer (3) is connected with to the two ends of channel mask sheet (1) at this X, it is characterized in that: described X becomes large gradually to the contour from top to bottom cross section of channel mask sheet and Y-direction channel mask sheet, form X to broaden gradually downwards to the width on the top of channel mask sheet and Y-direction channel mask sheet, the width of bottom is maximum, form the variable cross-section of X to channel mask sheet and Y-direction channel mask sheet.
2. collimator after a kind of variable cross-section CT equipment according to claim 1, it is characterized in that: described X is fan-shaped to the shape of channel mask sheet, X forms downward concave arc respectively to the limit, upper end of channel mask sheet and limit, lower end, and Y-direction channel mask sheet is formed and oliquely downward become dispersion shape gradually from center.
3. collimator after a kind of variable cross-section CT equipment according to claim 2, it is characterized in that: X is to Y-direction channel mask sheet slot (4) of channel mask sheet, formed outward-dipping gradually to the slot of arranged on both sides from center, the Y-direction channel mask sheet of insertion slot is formed from center, oliquely downward becomes dispersion shape gradually.
4. collimator after a kind of variable cross-section CT equipment according to Claims 2 or 3, is characterized in that: described X starts to channel mask Pian Cong center to be formed to arranged on both sides to be oliquely downward inclined to dispersion shape gradually.
5. collimator after a kind of variable cross-section CT equipment according to claim 4, is characterized in that: described X is triangle to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
6. collimator after a kind of variable cross-section CT equipment according to claim 4, is characterized in that: described X is antiparallelogram to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
7. collimator after a kind of variable cross-section CT equipment according to claim 4, is characterized in that: described X is multistage rectangle to the shape of the variable cross-section of channel mask sheet and Y-direction channel mask sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420387620.0U CN204016321U (en) | 2014-07-14 | 2014-07-14 | Collimator after a kind of variable cross-section CT equipment |
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| CN201420387620.0U CN204016321U (en) | 2014-07-14 | 2014-07-14 | Collimator after a kind of variable cross-section CT equipment |
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| CN204016321U true CN204016321U (en) | 2014-12-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107970038A (en) * | 2016-10-24 | 2018-05-01 | 北京东软医疗设备有限公司 | A kind of x-ray collimator and CT machine |
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2014
- 2014-07-14 CN CN201420387620.0U patent/CN204016321U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107970038A (en) * | 2016-10-24 | 2018-05-01 | 北京东软医疗设备有限公司 | A kind of x-ray collimator and CT machine |
| CN107970038B (en) * | 2016-10-24 | 2021-06-22 | 北京东软医疗设备有限公司 | X-ray collimator and CT (computed tomography) machine |
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Address after: 100176 1st floor, building 8, 11 Kangding street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee after: Sinovision Technology (Beijing) Co.,Ltd. Address before: 100176 1st floor, No.13, Yongchang North Road, Yizhuang Economic Development Zone, Daxing District, Beijing Patentee before: SAINUO WEISHENG TECHNOLOGY (BEIJING) Co.,Ltd. |