KR101689082B1 - X-ray Collimator Systems and Methods using Keystone Correction. - Google Patents

X-ray Collimator Systems and Methods using Keystone Correction. Download PDF

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Publication number
KR101689082B1
KR101689082B1 KR1020150089391A KR20150089391A KR101689082B1 KR 101689082 B1 KR101689082 B1 KR 101689082B1 KR 1020150089391 A KR1020150089391 A KR 1020150089391A KR 20150089391 A KR20150089391 A KR 20150089391A KR 101689082 B1 KR101689082 B1 KR 101689082B1
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South Korea
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light source
radiation
field
irradiation
unit
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KR1020150089391A
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Korean (ko)
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김정수
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주식회사 에스지헬스케어
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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
    • A61B6/06—Diaphragms
    • 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
    • A61B6/08—Auxiliary means for directing the radiation beam to a particular spot, e.g. using light beams
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
    • G21K1/00—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating
    • G21K1/02—Arrangements for handling particles or ionising radiation, e.g. focusing or moderating using diaphragms, collimators

Abstract

The present invention relates to an apparatus and method for adjusting a radiation field using keystone correction, and more particularly, to a radiation field adjustment apparatus for adjusting a field of view using a keystone correction without a reflecting mirror positioned outside a radiation field adjusting apparatus, It does not pass through the reflection mirror. Therefore, it is possible to obtain finer results than before, and it is not only technically difficult to match the irradiation field of the radiation with the irradiation field of the visible ray in the designing and manufacturing stage, .
A radiation irradiation field adjusting apparatus for this purpose is a radiation irradiation field adjusting unit for adjusting the irradiation field of the incident radiation, a radiation output unit for irradiating the irradiation field adjusted radiation field, and a radiation irradiation field adjusting unit A light source device for irradiating a visible ray so as to coincide with a radiation irradiation range located at a lower end side of the radiation irradiation field adjustment device case, a light source field adjustment device positioned at the front end of the light source device for adjusting the irradiation angle and shape of the light source, A light source unit connection unit for connecting the light source unit to a radiation irradiation device generator case, and a light source unit rotation unit for rotating the light source unit to change a light source irradiation angle.
At this time, it is possible to control the angle of the optical axis of the light source and the angle and shape of the light source when the irradiation field range is changed according to the change of the irradiation field and the change of the source-to-image distance (SID) between the radiation generating device and the radiation receiving unit .

Description

X-ray Collimator Systems and Methods using Keystone Correction.

The present invention relates to an apparatus and method for adjusting a radiation field by using a keystone correction, and more particularly, to an apparatus and a method for adjusting a radiation field by using a keystone correction, (SID) between a radiation generator and a radiation receiver, and more particularly, to a device and method for using a keystone correction function to adjust an irradiation field of a light source in accordance with a radiation field, An optical axis adjusting device for adjusting the angle of an optical axis of the light source device installed at the lower outer side of the irradiation field adjusting device according to the change of the source-to-image distance, a light source controlling the angle of the light source irradiated from the light source device, And an irradiation field regulating device. The irradiation field is checked and adjusted, By irradiating the invention relates to a radiation josaya control apparatus and method to minimize the radiation dose of the patient.

In general, clinical diagnosis is very important in medical practice, and non-invasive medical imaging methods using radiography are used as the most representative clinical diagnostic methods.

However, unlike visible light, this radiation is not visible to the naked eye, and is exposed to a large amount of radiation over a long period of time.

The main purpose of the radiation field control system is to limit the scope of irradiation as one of the typical devices for minimizing such radiation exposure.

Generally, the radiation field adjustment device called collimator is equipped with a diaphragm-like control device which is cut off by x-ray attenuating material so as to adjust the size of the radiation and the degree of spread of the angle to the purpose, A visible light source device for visually confirming an irradiation area of invisible radiation, and the like.

1 is a typical illustration of a radiographic apparatus using a conventional radiation field control apparatus.

As shown in FIG. 1, a general radiation field control apparatus includes an irradiation field adjusting unit for adjusting an irradiation field of radiation incident in a vertical direction from a radiation generating apparatus;

A light source device for irradiating a visible ray so as to coincide with a radiation irradiation range;

A reflection mirror positioned in the irradiation path of the radiation and the irradiation path of the light source device so as to match the irradiation path of the visible ray with the radiation by reflecting the visible ray;

And a light source device accommodating unit for accommodating and protecting the various devices.

At this time, the above-described configuration describes the most typical radiation irradiation field adjusting apparatus, and in practice, a wide variety of configurations and implementation methods can be used.

However, in the conventional radiation field adjusting apparatus, since the light source device is controlled by using a reflection mirror in a position and angle at a desired position and angle at a position where the radiation source is not blocked, the radiation is irradiated through the reflection mirror, There is a problem.

FIG. 2 is an example of a radiation field inconsistency in a conventional radiographic imaging apparatus using a radiation field adjusting apparatus.

As shown in FIG. 2, when the reflection mirror is turned off, the irradiation field of the visible light beam is changed to be inconsistent with the irradiation field.

In particular, since the irradiation field of the visible ray is very sensitive to the angle of the reflection mirror, there are many technical difficulties in matching the irradiation field of the radiation and the irradiation field of the visible ray from the designing and manufacturing stage, There is a difficulty in checking and improving.

In order to solve such a problem, a method of implementing without a reflecting mirror has been devised.

Korean Patent Laid-Open No. 10-1352542 In a collimator of a lamp-moving type, a lamp part that emits light and a condenser lens that condenses the light are moved at the same time, so that the lamp part and the condenser lens sharpens a cross point And the lamp unit and the condenser lens after displaying the cross point are returned to their home positions, and the X-rays irradiated from the X-ray equipment are not interfered with, and the X-ray is irradiated to a specific part (the affected part) So that it can be accurately examined.

However, since this method also requires continuous movement of the lamp and condenser lens, it is required to confirm whether or not the irradiation field is inconsistent according to the use for a long time. Since the lamp is located inside the apparatus, Difficulties in management are expected.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a light source device for irradiating visible light, And it is an object of the present invention to provide a radiation irradiation field adjusting apparatus and method which are convenient for maintenance during use.

Further, in the case where the irradiation field range is changed due to a change in the source-to-image distance (SID) between the radiation generating apparatus and the radiation receiving unit due to the change of the irradiation field of the irradiation field adjusting apparatus or the movement of the tube, The present invention aims to provide an apparatus and a method for controlling a radiation field, which is optimized for radiography and results, by matching the range of the visible light field to the field of radiation only by the control of the control and the light source field control unit.

According to an aspect of the present invention for achieving the object to be solved by the present invention,

A first radiation irradiation field adjusting unit 210 for adjusting a radiation irradiation range;

A second radiation irradiation field adjusting unit 220 arranged vertically with the first radiation irradiation field adjusting unit 210 to adjust a radiation irradiation range;

A radiation incidence part (not shown) and a radiation output part 250, which are movement paths of the radiation;

A light source device (300) for outputting visible light so as to display the radiation irradiation range;

And a radiation irradiation field adjusting device case 290 which functions to store and protect the various devices.

At this time, the light source device 300 is located at a side lower portion of the radiation irradiation field adjusting device case 290, and the source-to-image distance is changed according to the distance (SID) between the radiation generating device and the radiation receiving device. The angle of the light source device 300 is controlled by the control so that the optical axis of the light source can pass through the center of the changed radiation receiving portion and the light source irradiation field adjusting unit 379 of the light source field adjusting device 370 controls the light source irradiation field adjusting unit 379, Can be changed.

According to the present invention, there is provided a radiation irradiation field adjusting apparatus and method using keystone correction according to the present invention, in which the size of a radiation receiving unit, the distance between a radiation generating apparatus and a radiation receiving unit (SID) By adjusting the angle of the optical axis and the angle and shape of the light source, it is possible to minimize the radiation exposure in radiography and fluoroscopy by adjusting the light source field so as to match with the field of radiation to provide optimal environment for ensuring light quantity and field of view .

1 is an exemplary view of a radiation imaging apparatus using a conventional radiation field control apparatus.
2 is a view showing another example of the construction of a radiographic apparatus using a conventional radiation field control apparatus.
3 is an exemplary view of a radiation irradiation field adjusting apparatus according to an embodiment of the present invention.
4 is a view illustrating an operation of a first radiation irradiation field adjusting unit of a radiation irradiation field adjusting apparatus according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an example in which a light source irradiation field is changed in a radiation irradiation field adjusting apparatus according to an embodiment of the present invention.
6 is a view illustrating another example of changing the light source field-of-view in the radiation field-of-view adjusting apparatus according to the embodiment of the present invention.
FIG. 7 is an exemplary view showing a three-dimensional representation of a radiation field and a light source field according to an embodiment of the present invention.
FIG. 8 is a view illustrating an irradiation field according to an embodiment of the present invention, a longitudinal section and a plan view of a light source irradiation field.
9 is a three-dimensional perspective view depicting a radiation field and a light source field according to an embodiment of the present invention.
10 is another exemplary view depicting a radiation field and an irradiation field according to an embodiment of the present invention.
11 is a diagram illustrating an example of a configuration of an optical axis adjusting apparatus of a light source apparatus according to an embodiment of the present invention.
FIG. 12 is an exemplary view of a first light source field-of-view adjusting unit according to an embodiment of the present invention.
FIG. 13 is a view illustrating an exemplary configuration of a second light source field-of-view adjusting unit according to an embodiment of the present invention.
FIG. 14 is an exemplary view of a configuration of a light source field-of-view adjusting unit according to an embodiment of the present invention.
FIG. 15 is a diagram illustrating another exemplary configuration of a light source field-of-view adjusting unit according to an embodiment of the present invention.
16 is another exemplary view depicting a longitudinal section of an illumination light according to an embodiment of the present invention.
17 is a block diagram showing a configuration of a radiation irradiation field adjusting apparatus and a light source apparatus, a light source field-of-view adjusting apparatus, an optical axis adjusting apparatus, and a control apparatus according to an embodiment of the present invention.

The terms or words used in the present specification and claims are intended to mean that the inventive concept of the present invention is in accordance with the technical idea of the present invention based on the principle that the inventor can appropriately define the concept of the term in order to explain its invention in the best way As well as the concept.

When an element is referred to as " including " an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention. Furthermore, the term " part " or the like described in the specification means a unit for processing at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a radiation irradiation field adjusting apparatus and method using the keystone correction according to the present invention will be described in detail.

3 is a longitudinal sectional view of a radiation irradiation field adjusting apparatus according to an embodiment of the present invention.

As shown in FIG. 3, according to an embodiment of the present invention,

An incidence part (not shown) on which the radiation is incident;

A first radiation irradiation field adjusting unit 210 and a second radiation irradiation field adjusting unit 220 vertically arranged to control an irradiation field of the incident radiation;

A radiation output unit 250 irradiated after the irradiation field is adjusted;

A radiation irradiation field adjusting device case 290 which functions to store and protect the various devices;

A light source device 300 positioned at the lower end of the irradiation field adjustment device case 290 for irradiating a visible light beam to coincide with a radiation irradiation range;

A light source unit connection unit 310 and a light source device rotation unit 320 for adjusting an optical axis angle;

And a light source field adjustment device 370 for adjusting the irradiation angle and shape of the light source.

At this time, when the distance from the radiation generating apparatus to the radiation receiving unit plane 390 changes according to the variation of the distance (SID: Source-to-Image Distance) between the radiation generating apparatus (not shown) and the radiation receiving unit, The radiation irradiation field is adjusted by adjusting the first radiation irradiation field adjusting unit 210 and the second radiation irradiation field adjusting unit 220 so as to be optimized for the radiation receiving unit plane 390.

At this time, when the distance from the light source unit 300 to the radiation receiving unit plane 390 is changed according to the variation of the source-to-image distance (SID) between the radiation generating unit (not shown) and the radiation receiving unit, The optical axis of the visible ray passes through the center of the receiving plane 390 and the light source field is controlled through the control of the light source field adjustment unit of the light source field adjustment device 370 to optimize the radiation field plane 390 .

More specifically, when the distance (SID: source-to-image distance) between the radiation generator (not shown) and the radiation receiver is distant, the light axis of the light source device 300 The light source control unit 379 shown in FIG. 15 is adjusted so as to move away from the light source so that the angle of the light source is narrowed and the final visible light region is fitted into the shape of the radiation receiving unit. 379) to adjust the trapezoidal shape of the iris.

4 is a view illustrating an operation of a first radiation irradiation field adjusting unit of a radiation irradiation field adjusting apparatus according to an embodiment of the present invention.

As shown in FIG. 4, the first radiation irradiation field controller according to an embodiment of the present invention includes:

A radiation guide groove 213 connecting fixing portions fixed to both side surfaces;

A radiation screw 212 placed side by side in the radiation guide groove 213 and serving as a reference for movement of the radiation linear motor 211;

A radiation linear motor 211 moving along the radiation screw 212;

And first radiation irradiation day adjusting plates 210a and 210b which are fixed to the radiation linear motor 211 and move together with the movement of the radiation linear motor 211. [

In this case, the first radiation irradiation field adjusting unit 210 is symmetrically opposed to each other and comprises two facing irradiation control plates. When the radiation irradiation field is controlled, the radiation linear motor A 211a and the radiation linear motor B 211b are symmetrically And moves in opposite directions by the same value.

Also, the operation illustrated in FIG. 4 is similarly applied to the second radiation irradiation field control unit 220 installed orthogonally to the first radiation irradiation field control unit 210, so that the irradiation field can be controlled on a slope.

FIG. 5 is an example of a light source field change in the radiation field control device according to an embodiment of the present invention.

As shown in FIG. 5, the light source field-of-view adjusting apparatus 370 controls the irradiation angle and the shape of the light source according to the distance (SID: source-to-image distance) between the radiation generating apparatus and the radiation receiving unit.

Since the optical axis of the light source device 300 does not coincide with the optical axis of the radiation but is diverged obliquely from the oblique line in the radial direction of the radiation receiving portion plane 390 as the final target, the radiation plane of the light receiving portion 300, A virtual orthogonal plane 380 that is a virtual plane orthogonal to the virtual orthogonal plane 380 can be set.

5, when the visible light ray is irradiated in the form of a square or a rectangle by the light source field-of-view adjusting device 370, the visible light rays appear in the shape of a square or a rectangle in the virtual orthogonal plane 380 , A problem arises that a visible ray in the radiation receiving portion plane 390 becomes trapezoidal due to the keystone distortion.

On the other hand, as shown in the second example of FIG. 5, when the shape of the visible light is illuminated in a trapezoidal manner by the light source field adjustment device 370 through the keystone correction reflecting various variables, the light source field in the virtual orthogonal plane 380 is trapezoidal But the radiation receiving surface 390 may have a square or rectangular shape so that the light source field and the radiation field can be matched with each other.

That is, the position and shape of the light source field adjustment unit 379 of the light source field adjustment unit 370 should be changed in order to match the light source field to the radiation field in the radiation receiving unit by reflecting the keystone correction calculated using the parameters.

6 is another example of a light source field change in the irradiation field adjustment apparatus according to an embodiment of the present invention.

6, when the distance SID (source-to-image distance) between the radiation generating apparatus and the radiation receiving unit is shifted and the radiation receiving unit plane 390 is changed from 390a to 390b, the virtual orthogonal plane 380 is also changed from 380a The irradiation direction of the light source unit 300 is adjusted so that the optical axis of the light source passes through the center of the radiation receiving unit and the light source irradiation field adjusting unit 379 inside the light source irradiation field adjusting unit 370 adjusts, And adjusts the trapezoidal shape of the light source field adjustment unit 379 so that the light source field is set to be a square or a rectangle corresponding to the radiation receiving unit in the plane of the radiation receiving unit 390 The height of the upper and lower sides of the trapezium increases in height, and the length of the upper side increases. As a whole, Nearest must be to equip a trapezoidal shape.

That is, when the distance (SID: source-to-image distance) between the radiation generating apparatus and the radiation receiving unit is changed, in order for the radiation receiving unit to match the radiation irradiation field with the radiation irradiation field, It is necessary to change the optical axis angle of the light source irradiation field adjusting unit 370 and to change the position and shape of the light source irradiation field adjusting unit 379 of the light source field adjusting unit 370 by reflecting the keystone correction calculated using the parameters.

At this time, the position and shape of the light source field adjustment unit 379 must be changed even if the source-to-image distance (SID) between the radiation generator and the radiation receiver is not changed but only the radiation field is changed.

FIGS. 7, 8, 9 and 10 illustrate a radiation field and a light source field according to an embodiment of the present invention in a three-dimensional or cross-sectional view.

7, FIG. 8, FIG. 9, and FIG. 10, the angle of the optical axis of the light source, the distance between the radiation source and the radiation source, The angle and shape can be specified.

More specifically, the trapezoidal shape of the virtual orthogonal plane 380 is calculated by using triangles and trigonometric functions resembling those of various planar systems, and then the trapezoidal shape of the virtual orthogonal plane 380 is calculated to obtain a trapezoidal shape, which should be expressed by the light source field adjustment unit 379 of the light source field- And control the throttle plate.

As shown in FIG. 7, when the radiation irradiated through the radiation exit portion 250 of the irradiation field adjustment device 200 reaches the radiation receiving portion plane 390, the irradiation surface coincides with the radiation receiving portion plane 390 , The irradiation axis of the radiation is perpendicularly incident on the center of the radiation receiving plane 390, and the radiation receiving plane 390 is assumed to be square for convenience of calculation.

The visible light emitted from the light source of the light source unit 300 is irradiated through the light source field adjustment unit 370 so as to coincide with the radiation receiving unit plane 390 so that the optical axis of the light source is incident on the center of the radiation receiving unit plane 390 So as to intersect the irradiation axis of the radiation on the radiation receiving portion plane 390.

In this case, a visible light irradiation surface orthogonal to the optical axis of the light source and sharing one side with the radiation receiving portion plane 390 is defined as a virtual orthogonal plane 380, and a plane system in which the irradiation axis of the radiation and the optical axis of the light source are cross- The calculation can be shown in Figs. 7 and 8.

If the length of one side of the radiation receiving unit assumed as a square is c , The lengths of the four sides of the radiation receiving portion plane 390 are all c , and therefore the length of the line segment EG is c .

In addition, the line segment AC is the radiation axis of the radiation, and the line is drawn from the radiation point A to the line segment EG. The length is defined as the source-to-image distance (SID) between the radiation generating unit and the radiation receiving unit. In the invention, this length is referred to as chi .

In addition, it is assumed that the length of the length La of the B perpendicular to the perpendicular drawn from the AC line O, and the line segment AO when it is assumed that the visible light source a B, the line segment BO b.

At this time, the a, b is a constant value that is determined by the design of such radiation josaya generator 200 and the light source device (300), c is a constant value that is determined by the radiation receiving unit, χ is the user when recording sheets radiation It is the variable value determined by the operation.

From the above constants, variables and assumptions, the optical axis angle of the light source is first calculated. "When called, from the optical axis of a line segment BC of a real light source, each CBB, the foot of the perpendicular from the light source down the line segment EG B B is the θ is the angle the optical axis of the light source. In this case, the length of the segment CB 'in the right triangle CBB' is a constant b such as the segment OB, and the length of the segment BB 'is the same variable as the segment OC ( χ- a ), so that the θ value can be calculated from the trigonometric function tan θ .

Next, calculate the irradiation angle and shape of the light source.

If the angle between the line segment BC and the line segment BB 'forming the θ, each FEG is also a θ. At this time, the length of the line segment CE from the right triangle CDE is defined from the length c of the radiation receiving plane 390, and since ? Is also the value calculated from the above, the value of the line segment DE is calculated from the formula of cos θ , line segment DE, .

Also, since the right triangle CDE and the right triangle BOC are similar triangles, the line segment DE: line segment OC = line segment CD: line segment BO, and the segment DE, line segment OC, and line segment BO are calculated or given values, . In addition, since the length of the line segment BC can be calculated by the Pythagorean theorem in the right triangle BOC, the length of the line segment BD can be calculated by subtracting the value of the segment CD from the length of the line segment BC.

Therefore, the segment value of DE, the segment BD at a right triangle BDE is hayeoteumeuro calculated as described above may produce a β + θ value from the trigonometric function tan (β + θ), θ values may be used to calculate the β value hayeoteumeuro calculator .

In addition, a right-angled triangle, so the length of the GBB 'line BB in the' length to the line GB 'of a given value, it is possible to calculate the α + θ value from the trigonometric function tan (α + θ), θ value hayeoteumeuro calculator the α value Can be calculated.

Since the α value and the length of the segment BD are known from the right triangular BDF, the length of the segment DF can be calculated from the trigonometric function tan α .

7 and 8, it is possible to calculate the height between the upper side and the lower side of the trapezoid on the virtual orthogonal plane 380. For this purpose, the light source should be irradiated upward and downward with respect to the optical axis of the light source The irradiation angle of the light source can be calculated.

9 is a plan view of a plane of the radiation receiving portion plane 390 extending from a virtual orthogonal plane 380 which is a visible light irradiation surface orthogonal to the optical axis of the light source and which shares one side with the radiation receiving portion plane 390, And a virtual visual field plane 381, which is a rectangle having an outer boundary with a portion that meets with a vertical line formed along the virtual visual field plane 381.

Here, the length of the line segment DF calculated using the triangles and trigonometric functions resembling in FIGS. 7 and 8 is assumed to be d for convenience.

In the above, the length of the segment EG is c And C is the center of the line segment EG, the length of the line segment CE and the line segment CG are the same as half of the length of the line segment EG, and the line segment EK, the line segment IG ', and the line segment JF And so on corresponds to half of one side of the radiation receiving section, so that it is calculated to be half of the length c .

Therefore, in FIG. 9 and FIG. 10, the length of the segment DE can be obtained from the segment CE, the segment DE and the trigonometric function tan ? In the right triangle CED, and the segment DE and the segment DG from the similarity ratio 1: 2 of the right triangle CEG and the right triangle GEG '', The length of the segment DG' can also be obtained.

In FIG. 10, since the right triangle DHF and the right triangle DIG 'are similar triangles, the line segment DF is a line segment DG' = a line segment HF: a line segment IG ', and the line segment DF, the line segment DG', and the line segment IG ' , The length of the line segment HF can be calculated.

Therefore, by deducting the length of the line segment HF in the length of the line segment JF to calculate the length of a line segment JH, and calculates the γ from the line segment DE with the combined length of a line segment DF it is possible to calculate the length of a line segment JK, trigonometric functions tan γ can do.

9 and 10, the upper side and the lower side length of the trapezoid on the virtual orthogonal plane 380 can be calculated, and the angle formed by both side sides can be calculated to define the trapezoid shape on the virtual orthogonal plane 380 can do.

7, 8, 9, and 10, constants and variable values such as the distance (SID) between the radiation generator and the radiation receiver, the position of the light source, the size of the radiation receiver, The angle of the optical axis of the light source, the angle and shape of the light source can be defined.

11 is a diagram illustrating an example of a configuration of an optical axis adjusting apparatus of a light source apparatus according to an embodiment of the present invention.

11, an optical axis adjusting apparatus according to an embodiment of the present invention includes:

A light source unit connection unit 310 for connecting the light source unit 300 to the radiation irradiation day case unit 290;

And a light source unit rotation unit 320 that rotates the light source unit 300 to change the light source irradiation angle.

At this time, the light source device rotation unit 320 incorporates a motor device (not shown) to rotate the light source device 300 according to the θ values derived from FIGS. 7, 8, 9 and 10 by an external control device .

FIGS. 12, 13, 14, 15 and 16 illustrate the configuration and operation of the light source irradiation day adjusting unit 379 for changing the light source irradiation day mode in the light source irradiation day adjusting unit 370, The position and the shape of the light source field adjustment unit 379 for accurately matching the irradiation field on the plane 390 can be defined.

As shown in FIG. 12, the first light source field adjustment unit according to an embodiment of the present invention includes:

A rotation fixing plate 371 fixed to a wall surface or the like;

A side surface fixing plate 372 fixed to a wall surface or the like;

A light source guide groove 375 connecting between the side fixing plates;

A light source screw 374 which is positioned adjacent to the light source guide groove 375 and is a reference for movement of the light source linear motor 373;

A light source linear motor 373 moving along the light source screw 374;

And a tilt adjustment plate 376 connected to the light source linear motor 373 and the rotation fixing plate 371 to rotate based on a connection point between the light source linear motor 373 and the rotation fixing plate 371 in accordance with the movement of the light source linear motor 373, .

At this time, the tilt adjustment plates 376 are symmetrically opposed to each other and operate by the same value in the opposite directions in accordance with the movement of the light source linear motor A 373a and the light source linear motor B 373b, And the tilt angle by the tilt adjusting plate B (376b) are the same.

In this case, the tilt angle of the tilt adjustment plate A 376a and the tilt adjustment plate B 376b is characterized by using the value of ? Derived from FIGS. 7, 8, 9, and 10, respectively.

As shown in FIG. 13, the second light source field-of-view adjusting unit according to the embodiment of the present invention includes:

A lower side fixing plate 377 fixed to a wall surface or the like;

An upper side fixing plate 378 fixed to a wall surface or the like;

A light guide groove C 375c connecting the lower side fixing plate 377 and the upper side fixing plate 378;

A light source screw C (374c) positioned adjacent to the light source guide groove (C) 375c and serving as a reference for movement of the light source linear motor C (373c);

And a light source linear motor C (373c) moving along the light source screw C (374c).

At this time, the variation of the trapezoidal height due to the movement of the light source linear motor C (373c) and thus the limitation of the light source irradiation angle are obtained by using the lengths and the ratios of the line segment DE and the line segment DF calculated in Figs.

FIG. 14 is an exemplary view showing the entire light source irradiation day adjusting unit 379 according to an embodiment of the present invention.

As shown in FIG. 14, when the visible light source needs to have a specific trapezoidal shape, a desired shape can be formed by limiting the light source irradiation angle using the first light source field adjustment unit and the second light source field adjustment unit.

The trapezoidal shape implemented by the light source field adjustment unit 379 is a shape similar to a trapezoidal shape of the virtual orthogonal plane 380 according to the relative distance between the light source device 300, the light source field adjustment device 370, and the virtual orthogonal plane 380. [ Its actual size ratio is defined, and will be described in more detail in Fig. 16 below.

FIG. 15 is an exemplary view showing a change in the position of the light source illumination control unit 379 according to a change in the distance between the light source and the virtual orthogonal plane 380 in the light source irradiation field adjusting unit 379 according to an embodiment of the present invention.

15, when the source-to-image distance (SID) between the radiation generating apparatus and the radiation receiving unit is shifted so that the radiation receiving unit plane 390 is changed from 390a to 390b, the light source irradiation field adjusting unit 379 So that the irradiation angle of the light source is narrowed.

At this time, the forward and backward movement of the light source field adjustment unit 379 can be implemented and configured by anyone using a common technique such as a linear motor (not shown), and therefore, a detailed description thereof will be omitted.

Further, since the shape of the light source according to the modification of the light source field-of-view adjusting unit 379 has been described in detail with reference to FIG. 6, redundant description will be omitted.

16 is a longitudinal sectional view of an illumination light according to an embodiment of the present invention.

At this time, the value of the line segment LM is set to a value given by the design of the light source field-of-view adjusting unit 379, and a variable range of the distance between the radiation generating apparatus and the radiation receiving unit (SID: Source-to-Image Distance) For the sake of convenience, it is assumed that e is a constant applied considering the variable range of the irradiation field adjusting unit 379.

In addition, because the value of the line segment BD z, triangle the optical axis of the light source speaking, y a line segment BL to that point orthogonal to the light source josaya control unit (379) L-like is a right triangle BML and right triangle BEC, y: z = e : the line segment DE.

In this case, the z is defined by Figure 7, the constants a, b, c and variable χ, and θ 8, 9, from Figure 10 above, so from a trigonometric function θ is defined by the variable χ and constants a, b again , and z is a value that varies depending on the change of the variable χ .

In addition, the line segment DE is defined by the constant c and the variable θ θ is again variable χ And the constants a and b , the line segment DE is also a value that varies with the change of the variable χ .

Therefore, the line segment BL, that is, y depends on the variable x , which is the source-to-image distance (SID) between the radiation generator and the radiation receiver, and the size e of the light source field adjustment unit 379 in the light source field adjustment unit 370 it can be seen that the function being defined, e is because it is given a constant depending on the design as a result the distance y is the distance of the radiation generator and the radiation receiver of the light source to the light source josaya control unit (379) (SID; source- to-Image distance) Is calculated by the inverse variable ?.

Also, even when the source-to-image distance (SID) between the radiation generating apparatus and the radiation receiving unit is not changed but only the radiation irradiation is changed, the position of the light source irradiation field adjusting unit 379 And the values that define the shape of the object can be calculated. Since sufficient contents have been discussed from the above process, further explanation will be omitted.

17 is a block diagram showing a configuration of a radiation irradiation field adjusting apparatus 200, a light source apparatus 300, a light source irradiation field adjusting apparatus 370, an optical axis adjusting apparatus, and a control apparatus according to an embodiment of the present invention.

17, when a constant value and a variable value such as a distance (SID: source-to-image distance) between the radiation generator and the radiation receiver, a size of the radiation receiver, and a relative position of the light source device are determined, Based on these values, the control unit calculates the appropriate values for the control using the constants and the parameters, and controls the first radiation irradiation field control unit 210 and the second radiation irradiation field control unit 220 of the radiation field control unit 200, So that the irradiation field is aligned with the radiation receiver plane 390 and the light source field adjustment unit 379 of the light source field adjustment unit 370 and the light source unit rotation unit 320 of the optical axis adjustment unit are controlled, To match the receiving plane 390.

It will be appreciated by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is to be understood, therefore, that the embodiments described above are to be considered in all respects as illustrative and not restrictive.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

200: Radiation field adjuster
210: First radiation irradiation field control unit
210a: First radiation irradiation field adjusting plate A
210b: First radiation irradiation field adjusting plate B
211: Radial linear motor
211a: Radiation linear motor A
211b: Radiation linear motor B
212: Radiation screw
212a: Radiation Screw A
212b: Radiation screw B
213: Radiation guide groove
213a: Radiation guide groove A
213b: Radiation guide groove B
220: second radiation irradiation field adjusting unit
250:
290: Radiographic field adjuster case
300: Light source device
310: Light source device connection part
320: Light source device rotating part
370: Light source field adjuster
371: rotating plate
372: side plate
372a: side fixing plate A
372b: side fixing plate B
372c: side fixing plate C
373: Light source linear motor
373a: Light source linear motor A
373b: Light source linear motor B
373c: Light source linear motor C
374: Light source screw
374a: light source screw A
374b: light source screw B
374c: light source screw C
375: Light source guide groove
375a: Light source guide groove A
375b: Light source guide groove B
375c: Light source guide groove C
376: Tilt control
376a: Tilt control A
376b: Tilt adjustment plate B
377: Lower side fixed plate
378: Upper side fixing plate
379: light source field adjustment unit
380: virtual orthogonal plane
380a: virtual orthogonal plane example A
380b: virtual orthogonal plane example B
381: Virtual field of view
390: radiation receiving plane
390a: Radiation receiver plane example A
390b: Radiation receiver plane example B

Claims (4)

An incident portion on which radiation is incident;
A radiation irradiation field adjusting unit for adjusting an irradiation field of the incident radiation;
A radiation output part for irradiating the irradiation field with the adjusted radiation;
A radiation irradiation field adjusting device case for storing and protecting the various devices;
A light source device positioned at a lower side of a lower side of the radiation field control device case to irradiate a visible light beam so as to coincide with a radiation irradiation range;
A light source field adjustment device positioned at a front end of the light source device for adjusting the irradiation angle and shape of the light source;
A light source device connection unit for connecting the light source device to a radiation irradiation device case;
And a light source unit rotating unit that rotates the light source unit to change a light source irradiation angle, thereby controlling the radiation irradiation field, the angle of the light source optical axis, and the angle and shape of the light source. The method according to claim 1,
The light source device is configured to be able to change the angle of the optical axis of the light source by controlling the rotation of the light source device rotation part, and the optical axis of the light source is always changed according to the change of the distance between the radiation generating device and the radiation receiving part (SID: Of the radiation irradiation field adjusting unit. The method according to claim 1,
The light source field adjustment device includes a first light source field adjustment unit and a second light source field adjustment unit so that the light source can be illuminated in a trapezoidal shape through keystone correction. Finally, the light source field adjustment unit includes a square And the radiation irradiation field adjusting device is configured to be rectangular. The method according to claim 1,
The light source field-of-view adjusting apparatus controls the distance between the radiation source and the light source of the light source field adjusting unit in accordance with the change of the source-to-image distance (SID) Square, or rectangular shape of the radiation image.
KR1020150089391A 2015-06-24 2015-06-24 X-ray Collimator Systems and Methods using Keystone Correction. KR101689082B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101880742B1 (en) * 2017-01-20 2018-07-20 (주)레벨소프트 Radiation emitting apparatus and method for controlling thereof
US11207038B2 (en) * 2019-03-29 2021-12-28 Siemens Healthcare Gmbh Method for collimator element adjustment of an x-ray system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120083099A (en) * 2011-01-17 2012-07-25 삼성전자주식회사 Collimator and control method thereof
KR20130012309A (en) * 2011-07-25 2013-02-04 삼성전자주식회사 Collimator and control method thereof
KR101352542B1 (en) * 2013-06-11 2014-01-17 박덕배 Collimator for lamp movement type

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120083099A (en) * 2011-01-17 2012-07-25 삼성전자주식회사 Collimator and control method thereof
KR20130012309A (en) * 2011-07-25 2013-02-04 삼성전자주식회사 Collimator and control method thereof
KR101352542B1 (en) * 2013-06-11 2014-01-17 박덕배 Collimator for lamp movement type

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101880742B1 (en) * 2017-01-20 2018-07-20 (주)레벨소프트 Radiation emitting apparatus and method for controlling thereof
US11207038B2 (en) * 2019-03-29 2021-12-28 Siemens Healthcare Gmbh Method for collimator element adjustment of an x-ray system

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