CN214761136U - Porous imaging focus measuring card - Google Patents

Abstract

The utility model discloses a porous formation of image focus measuring card, including the measuring card body, seted up a plurality of holes on the measuring card body, a plurality of holes evenly distributed is on the measuring card body. The utility model belongs to the technical field of detection device, the utility model aims to solve the unsafe problem of focus measured data among the prior art. The technical effects achieved are as follows: the measuring card is more convenient to use, more accurate in measured data and better in imaging effect due to the arrangement of the plurality of holes.

Description

Porous imaging focus measuring card

Technical Field

The utility model relates to a detection device technical field, concretely relates to porous formation of image focus measuring card.

Background

The measurement of the focal dimension of the X-ray tube is one of important items of quality detection and quality control in the production and application links of a medical X-ray device, the size of the focal dimension directly influences the quality of an X-ray photographic image, the focal dimension is small, the imaging geometric penumbra is small, and the image boundary is clear; and conversely, the geometric blurring degree of the image boundary is increased.

In the prior art, hardware or a measuring instrument containing software is manufactured according to the requirements of slit imaging manufactured according to the requirements of the standard YY/T0063-2007 standard of medical diagnosis X-ray tube assembly focus characteristics of medical electrical equipment.

In JJG 1078-2012X-ray radiation source of medical digital photography (CR, DR) system, the focus measurement specifies the slit focus measurement mode, the size measurement of the focus image can be directly measured in the DR and CR systems, and the measurement and calculation of the percentage value of the line spread function curve of the focus image are not required.

The portable Slit camera of RTI Slit Camear in Sweden is provided with a fixed bracket and a detachable Slit measuring card. And the requirement of JJG078-2012 standard is met, and images are read and the focal spot size is measured in a DR or CR system.

The RFM real-time Focussmeter slit type real-time focus detector of the Sweden RTI company is provided with a fixed support and a digital image receiving unit, can independently complete focus size detection, and is provided with four boundary detection functions on an image receiver so as to verify whether a focus photographic image is in an allowable range. In the measuring process, the device can automatically rotate to realize the real-time measurement of the sizes of the focuses in two directions.

The real-time focus measuring instrument patent number CN 202230206U adopts a double slit and a digital imaging system to complete the focus measurement in real time, which is different from the RFM real-time Focusizer slit real-time focus detector of Sweden company in that the mode of confirming the photographing image permission of the four boundaries is changed into the mode of confirming the collimation of the ray center of the double slits, the RFM real-time Focusizer slit real-time focus detector and the real-time focus measuring instrument patent number CN 202230206U are independent real-time finished focus dimension measuring instruments, the method of respectively adopting the image boundaries or the double slits to confirm the photographing image boundaries or the collimation of the ray center line cannot avoid the ray center line not vertical to the image receiver, so that the single-side image boundaries and the single-side oblique rays pass through the slit center to meet the permission, and the deviation of the ray center line from the image boundaries or the ray center occurs after 90 degrees, resulting in unauthorized measurements or significant deviations in the measurement data. In practice, it is not appropriate to use a remedy of correcting the image boundary or the collimation center twice. There is no auxiliary ray centerline positioning guidance or suggestion in the application description of such devices. The Swedish RTI Slit Camear portable Slit camera directly measures the size of a focus by means of DR and CR image systems, abandons an image function curve measuring method, and has inevitable subjective influence on measurement point selection by image penumbra and directly influences measurement precision. In addition, the portable slit camera conforms to the JJJG 1078-2012 standard, and the operation guidance describes the requirement that the measurement has an aligned ray center line, and has no guidance way and method. The requirement for ray center lines lacks monitoring and evaluation, and the reality of difficult ray center alignment is not solved.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a porous formation of image focus measuring card to can't carry out the problem of X ray focus characteristic and ray distribution characteristic among the solution prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

according to the utility model discloses a first aspect, a porous formation of image focus measurement card, including the measurement card body, a plurality of holes have been seted up on the measurement card body, and a plurality of holes evenly distributed is on the measurement card body.

Further, the thickness of the measurement card body ranges from any value between 0.02mm to 0.25 mm.

Further, the shape of the measuring card body is rectangular.

Further, the length of the measuring card body ranges from any value between 5mm and 80 mm.

Further, the width of the measurement card body ranges from any value between 5mm and 80 mm.

Further, the distance between a hole and an adjacent hole ranges from any value between 2mm and 20 mm.

Further, still include the frame, the frame is installed in the periphery side of measuring card body.

Further, the measuring card body is made of metal.

Further, the measuring card body is made of lead foil and/or tungsten sheets.

According to the utility model discloses a porous formation of image focus measurement card of first aspect has following advantage: the measuring card realizes the following functions through the arrangement that a plurality of holes are uniformly distributed on the measuring card body: firstly, visually displaying the bilateral effect of the characteristics of the primary focus and the secondary focus of the ray; secondly, the anode effect of the reflecting target X-ray tube in the long axis direction is visually displayed, the effective focus of the anode end is small, and the effective focus of the cathode end is large; thirdly, under the condition that an auxiliary scheme is provided, the measuring card solves the problem that the central line of the X-ray of the effective focus vertically passes through the central hole of the measuring card and vertically reaches the X-ray digital imaging plate, thereby realizing the function of accurately measuring the focus of the X-ray tube on site; fourthly, when the ray center line of the measuring card is positioned by using the original equipment simulation light, the accurate measurement of the focus size of the X-ray tube can be realized through the known information of the anode inclination angle, the amplification factor, the distance, the porous plate and the small hole distance of the X-ray tube and the like and mathematical operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structure, ratio, size and the like shown in the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention has no technical essential significance, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy and the achievable purpose of the present invention.

Fig. 1 is an overall structural schematic diagram of a multi-aperture imaging focus measurement card according to some embodiments of the present invention.

Fig. 2 is a schematic structural view of a measurement card body of a multi-aperture imaging focus measurement card according to some embodiments of the present invention.

In the figure: 1. measurement card body, 2, hole, 3, frame.

Detailed Description

The present invention is described in terms of specific embodiments, and other advantages and benefits of the present invention will become apparent to those skilled in the art from the following disclosure. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 to fig. 2, the utility model discloses a porous formation of image focus measuring card in the embodiment of the first aspect, including measuring card body 1, a plurality of holes 2 have been seted up on measuring card body 1, and a plurality of holes 2 evenly distributed is on measuring card body 1.

In the above embodiment, it should be noted that the shape of the hole 2 is circular, and the diameter of the hole 2 ranges from any value between 0.01mm and 1 mm.

The technical effects achieved by the above embodiment are as follows: the measurement card has the following functions by the arrangement of the plurality of holes 2 uniformly distributed on the measurement card body 1: firstly, visually displaying the bilateral effect of the characteristics of the primary focus and the secondary focus of the ray; secondly, the anode effect of the reflecting target X-ray tube in the long axis direction is visually displayed, the effective focus of the anode end is small, and the effective focus of the cathode end is large; thirdly, the measuring card solves the problem that the central line of the effective focus X-ray vertically passes through the central hole of the measuring card and vertically reaches the X-ray digital imaging plate under the condition of an auxiliary scheme, thereby realizing the function of accurately measuring the focus of the X-ray tube on site; fourthly, when the measuring card determines the center of the ray according to the simulated light of the original machine, the accurate measurement of the focus size of the X-ray tube is realized through the mathematical operation by knowing the information of the inclination angle, the amplification factor, the distance, the small hole distance of the perforated plate and the like of the anode of the X-ray tube. Fifth, the present measurement card and images may also be applied to educational instruction sheet examples and course tests.

The multi-hole or imaging focal point measuring card does not determine the ray center by means of an auxiliary method, and only needs to obtain a multi-hole photographic image of a relative center position, obtain the exact position of the ray center line and the accurate effective focal point size by measuring and applying a plurality of regular image function curve data, fixed magnification, fixed hole spacing, data information of a fixed anode target inclination angle and a reflecting target (anode thick target) dome anode characteristic rule and then carrying out mathematical calculation (manual or software).

Alternatively, as shown in fig. 1 to 2, in some embodiments, the thickness of the measurement card body 1 ranges anywhere from 0.02mm to 0.25 mm.

In the above alternative embodiment, it should be noted that, preferably, the thickness of the measurement card body 1 is 0.05 mm.

The beneficial effects of the above alternative embodiment are: the thickness range of the measuring card body 1 is limited, so that the accurate measuring focus of the measuring card can be guaranteed, and the influence of geometric penumbra on the image measuring accuracy can be reduced.

Alternatively, as shown in fig. 1 to 2, in some embodiments, the shape of the measurement card body 1 is rectangular.

In the above alternative embodiment, it should be noted that, preferably, the shape of the measurement card body 1 is square.

The beneficial effects of the above alternative embodiment are: the limitation of 1 shape through the survey card body can guarantee that this survey card location is more convenient when using, and the reason is, the rectangle compares other shapes and takes and place all easier.

Alternatively, as shown in fig. 1 to 2, in some embodiments, the length of the measurement card body 1 ranges from any value between 5mm to 80 mm.

In the above alternative embodiment, it should be noted that, preferably, the length of the measuring card body 1 is 50 mm.

The beneficial effects of the above alternative embodiment are: the length range of the measuring card body 1 is limited, so that the maximum utilization of materials can be ensured while the accurate measuring focus of the measuring card is ensured.

Alternatively, as shown in fig. 1 to 2, in some embodiments, the width of the measurement card body 1 ranges from any value between 5mm to 80 mm.

In the above alternative embodiment, it should be noted that, preferably, the width of the measuring card body 1 is 50 mm.

The beneficial effects of the above alternative embodiment are: the width range of the measuring card body 1 is limited, so that the accurate measuring focus of the measuring card can be guaranteed, and the influence of geometric penumbra on the image measuring accuracy can be reduced.

Alternatively, as shown in fig. 1-2, in some embodiments, the distance between a hole 2 and an adjacent hole 2 ranges anywhere from 2mm to 20 mm.

In the above alternative embodiment, it should be noted that, preferably, the shape of the hole 2 is circular or rectangular, and the distance between the hole 2 and the adjacent hole 2 is 5 mm.

The beneficial effects of the above alternative embodiment are: the distance between the hole 2 and the adjacent hole 2 ranges from 2mm to 20mm, and the accuracy of the measuring card for measuring the imaging focus can be ensured.

Optionally, as shown in fig. 1 to 2, in some embodiments, the measuring card further includes a frame 3, and the frame 3 is mounted on an outer peripheral side of the measuring card body 1.

In the above alternative embodiment, it should be noted that the shape of the frame 3 is the same as that of the measurement card body 1.

The beneficial effects of the above alternative embodiment are: the setting of frame 3 can reduce the wearing and tearing speed when this measuring card uses, and then has strengthened the life of this measuring card.

Alternatively, as shown in fig. 1 to 2, in some embodiments, the measurement card body 1 is made of metal.

In the above alternative embodiment, it should be noted that, preferably, the measuring card body 1 is made of high atomic number metal.

Alternatively, as shown in fig. 1 to 2, in some embodiments, the measurement card body 1 is made of lead foil and/or tungsten sheet.

The beneficial effects of the above alternative embodiment are: the arrangement of the lead foil and/or the tungsten sheet through the measuring card body 1 can prevent rays from penetrating the metal layer to generate unnecessary images, so that the measuring accuracy of the measuring card is ensured, the arrangement and processing technology of the lead foil and/or the tungsten sheet through the measuring card body 1 is simplified, the processing is easy, and the popularization of the measuring card is facilitated.

The utility model discloses a method for using porous formation of image focus measurement card in the embodiment of second aspect uses a porous formation of image focus measurement card as the embodiment of first aspect, includes following step:

step 1: the DR image receiving plate is placed on a platform below the examination bed or the special bracket, and the central line of the ray simulation irradiation field is adjusted to be aligned with the center of the image receiving plate; then, the image receiving plate or the bracket platform is adjusted by using the bidirectional digital display level meter to enable the image receiving plate to reach the level;

step 2: placing a collimation degree measuring plate on the surface of the image receiving plate, keeping the center of the collimation degree measuring plate consistent with that of the image receiving plate, and extruding and fixing the collimation degree measuring plate for replacing a measuring card to repeat a result; then, placing a wire harness collimation detection cylinder at the center of the collimation degree measurement plate, and aligning a steel bead below the detection cylinder with the center of the collimation degree measurement plate;

and step 3: adjusting the irradiation conditions of the diagnostic X-ray DR equipment, and performing first ray irradiation; observing whether the upper steel ball and the lower steel ball of the image detection cylinder are overlapped after irradiation, if the estimation of the non-overlapping reference deviation and the whole scale move the image receiving plate, then carrying out secondary ray irradiation, and repeating the inspection and the execution until the upper steel ball and the lower steel ball of the collimation cylinder are overlapped;

and 4, step 4: loading the multi-hole imaging measurement card to the central position of a horizontal frame of a support platform or an output port of a ray beam splitter, adjusting the position of the measurement card, irradiating rays, and observing whether a hole 2 in the center of the measurement card in an image is superposed with the central points of the collimation plate and the detection cylinder; if the alignment plate and the detection cylinder are not overlapped, the measurement card is adjusted at the position of the horizontal support according to the reference deviation degree, the ray irradiation is performed again, and whether the hole 2 in the center of the measurement card in the image is overlapped with the center points of the alignment plate and the detection cylinder or not is continuously observed; until the hole 2 at the center of the measuring card coincides with the centers of the collimation plate and the detection cylinder;

and 5: removing the collimation degree measuring plate and the image detecting cylinder, carrying out measuring card photography, observing and copying a Dicom format image;

step 6: respectively making function curves for images in the long axis direction and the short axis direction at the middle position of the central hole 2 by using image processing software, measuring and calculating the size of an image small hole, and dividing by a magnification factor to respectively obtain the effective focal sizes in the long axis direction and the short axis direction;

and 7: the DR system image and software are used to measure the sizes of the small holes in the hole 2 image in the center of the long axis and the short axis of the image, and then divided by the magnification factor to obtain the effective focal sizes in the direction of the long axis and the short axis.

Specifically, the inclination angle of the X-ray target is defined as the included angle between the target surface and the projection direction of the X-ray; the effective focus of the X-ray is defined as the projection of the actual focus in the projection direction of the X-ray, the width of the effective focus is equal to that of the actual focus, and the length of the effective focus is the sine value of the actual focus length multiplied by the target surface inclination angle; the definition of the bimodal distribution is that electrons emitted by the front end of a filament of an X-ray tube for medical diagnosis are firstly dispersed and then focused to fly to an anode target surface to form a primary focus, electrons emitted by the side surface of the filament are then dispersed and focused to collide the anode target surface to form a secondary focus, and the electron density distribution on the focus of the X-ray tube is uneven, so that the image intensity distribution of the X-ray focus forms a bimodal distribution; the definition of the anode effect is located in an effective irradiation field, the dosage of the X-ray central line in the length direction is 100%, the ray distribution at the anode end is gradually reduced, and the ray distribution at the cathode end is gradually increased. The size of the anode end of the effective focus size is reduced, the size of the cathode end is increased, and the size of the effective focus in the width direction is not changed; the wire harness perpendicularity detection cylinder is defined in a way that the centers of the upper end and the lower end of a PMMA closed cylinder are respectively provided with a 1-2 mm steel ball, the two steel balls are required to be kept on the same vertical line, and the extension line of the steel ball connecting line is vertical to the plane of the lower end of the cylinder; the collimation degree measuring plate is defined as a flat plate marked with cross line scales and four boundary scales for measuring the consistency of the X-ray irradiation field and the simulated light irradiation field. The focus measurement only requires a cross line, and four sides are convenient to position; the ray center line is the effective focus ray center line and is vertical to the image receptor; the ray center line is perpendicular to the measuring card and passes through the center position of the central hole to reach the image receptor.

The technical effects achieved by the above embodiment are as follows: the orderly-arranged multi-aperture imaging focus measuring card is matched with a DR system and a CR system, and the measurement of the focus size of the X-ray tube can be realized on site according to the JJG1708-2012 requirement; the orderly-arranged porous imaging focus measuring cards are matched with DR and CR systems to obtain X-ray digital image images of anode effect characteristics and ray double-peak distribution characteristics on site, so that the limitation of an anode effect characteristic schematic diagram is broken through from teaching experiments, and related professional teaching and popular science actions are facilitated; the center of the ray is positioned once, so that the improper practice of positioning twice for measuring the focal sizes of the long shaft and the short shaft is avoided; the porous imaging focus measurement card photographic image with the accurate positioning of the ray center can realize accurate effective focus size measurement according to the YY/T0063 standard; the photographic image of the multi-aperture imaging focus measuring card with the ray center not accurately positioned is subjected to mathematical calculation or software analysis to realize accurate measurement of the effective focus size; the cost and difficulty of effective focus measurement are reduced, and the quality control action of the focus measurement is possible.

Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.

Claims (9)

1. The utility model provides a porous formation of image focus measuring card, its characterized in that, includes measuring card body (1), a plurality of holes (2), a plurality of have been seted up on measuring card body (1) hole (2) evenly distributed is in on the measuring card body (1).

2. A multi-aperture imaging focus measurement card according to claim 1, characterized in that the thickness of the measurement card body (1) ranges anywhere from 0.02mm to 0.25 mm.

3. The multi-aperture imaging focus measurement card according to claim 1, characterized in that the measurement card body (1) is rectangular in shape.

4. A multi-aperture imaging focus measurement card according to claim 3, characterized in that the length of the measurement card body (1) ranges from any value between 5mm and 80 mm.

5. A multi-aperture imaging focus measurement card according to claim 3, characterized in that the width of the measurement card body (1) ranges from any value between 5mm and 80 mm.

6. The multi-aperture imaging focus measurement card according to claim 1, characterized in that the distance between the aperture (2) and the adjacent aperture (2) ranges from any value between 2mm and 20 mm.

7. The multi-aperture imaging focus measurement card according to claim 1, further comprising a frame (3), wherein the frame (3) is mounted on the outer periphery of the measurement card body (1).

8. The multi-aperture imaging focus measurement card according to claim 1, characterized in that the measurement card body (1) is made of metal.

9. The multi-aperture imaging focus measurement card according to claim 1, characterized in that the measurement card body (1) is made of lead foil and/or tungsten sheet.

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