KR101571030B1 - Scanning method for detecting x-ray in bone density measuring device and measuring device - Google Patents

Scanning method for detecting x-ray in bone density measuring device and measuring device Download PDF

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Publication number
KR101571030B1
KR101571030B1 KR1020150069557A KR20150069557A KR101571030B1 KR 101571030 B1 KR101571030 B1 KR 101571030B1 KR 1020150069557 A KR1020150069557 A KR 1020150069557A KR 20150069557 A KR20150069557 A KR 20150069557A KR 101571030 B1 KR101571030 B1 KR 101571030B1
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KR
South Korea
Prior art keywords
detector
ray generator
scanning
moving
unit
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KR1020150069557A
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Korean (ko)
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한승무
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주식회사 비엠텍월드와이드
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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
    • A61B6/50—Clinical applications
    • A61B6/505—Clinical applications involving diagnosis of bone
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/45—For evaluating or diagnosing the musculoskeletal system or teeth
    • A61B5/4504—Bones
    • A61B5/4509—Bone density determination
    • 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
    • A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis

Abstract

The present invention relates to a scanning method and a bone density measuring apparatus for detecting X-rays in a bone densitometer, and more particularly, to an X-ray generator for emitting X-rays. A detector having a plurality of unit detecting elements which are emitted from the X-ray generator and detect X-rays transmitted through the pid entities; A support for movably supporting the detector and the X-ray generator; And a control unit for controlling the movement of the support unit and the operation of the X-ray generator and the detector, the method comprising the steps of: moving the support unit in a sweeping direction while moving the support unit in a sweeping direction, A first scanning step of causing a scanning operation to be performed by a detector and an X-ray generator; The controller moves the detector in the direction perpendicular to the sweep direction by a length corresponding to the width direction PW / magnification S of the unit detecting element, A second scanning step of controlling movement of the supporter, the X-ray generator and the detector so as to repeat the process of performing the scanning operation by the detector and the X-ray generator while moving the S-1 times; And a controller for controlling the detector and the X-ray generator by a length of a detector in a width direction of the detector corresponding to a total sum of widthwise lengths (PW) of the unit detecting elements, And a moving step of moving the support unit so as to move in a direction perpendicular to the sweep direction, wherein the scan operation is performed on the pivot assembly, and the scan method for detecting X- Device.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bone-density measuring apparatus and a bone-

The present invention relates to a scanning method for detecting X-rays in a bone densitometry apparatus and a bone density measuring apparatus for performing the same. More particularly, the present invention relates to a bone density measuring apparatus capable of effectively improving resolution at the time of bone density measurement, And a bone density measuring device for performing the method.

BACKGROUND ART A dual energy X-ray absorptiometry (DEXA) system is a system for measuring bone density by detecting a X-ray generated by an X-ray generator and transmitted through a patient's body using a detector, Method. Such a dexterous bone densitometry apparatus is generally classified into a pencil beam system and a fan beam system according to the configuration of an X-ray generator and a detector.

The pencil beam method measures bone density by radiating X-rays from an X-ray generator to a small hole of a few millimeters and detecting with a single-element detector while moving the X-ray generator and the detector together. This method takes a long time to measure but has an advantage that it is inexpensive.

1, a fan beam system is a system in which a detector is constituted by a plurality of unit detecting elements, an X-ray is spread on a two-dimensional plane in a fan shape, and the X-ray is detected by a plurality of unit detecting elements . The larger the number of unit detection elements, the higher the resolution and the faster the measurement becomes. However, as the number of unit detection elements increases, the price of the detector increases exponentially and is very expensive.

Therefore, there is a demand for a method for realizing a fan beam type dexterous bone density measuring apparatus having a high resolution at a low cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scanning method and a bone density measuring apparatus for detecting X-rays in a bone density measuring apparatus capable of realizing a high resolution at a low cost while maintaining a high measuring time .

According to an aspect of the present invention, there is provided an X-ray imaging apparatus including: an X-ray generator for emitting X-rays; A detector having a plurality of unit detecting elements which are emitted from the X-ray generator and detect X-rays transmitted through the pid entities; A support for movably supporting the detector and the X-ray generator; And a control unit for controlling the movement of the support unit and the operation of the X-ray generator and the detector, the method comprising the steps of: moving the support unit in a sweeping direction while moving the support unit in a sweeping direction, A first scanning step of causing a scanning operation to be performed by a detector and an X-ray generator; The controller moves the detector in the direction perpendicular to the sweep direction by a length corresponding to the width direction PW / magnification S of the unit detecting element, A second scanning step of controlling movement of the supporter, the X-ray generator and the detector so as to repeat the process of performing the scanning operation by the detector and the X-ray generator while moving the S-1 times; And a controller for controlling the detector and the X-ray generator by a length of a detector in a width direction of the detector corresponding to a total sum of widthwise lengths (PW) of the unit detecting elements, And a moving step of moving the supporting part to move in a direction perpendicular to the sweep direction is repeatedly performed while performing a scanning operation on the pivotal member, thereby providing a scanning method for detecting X-rays.

Here, after performing the second scanning step, the controller may control the number (N) of unit detecting elements x multiplication factor (x) based on the pixel value obtained by each unit detecting element of the detector through the first and second scanning steps (S) pixel values.

Further, the control unit may be configured to form a divided pixel by a magnitude (S) divided by a length (PW) in the width direction of the unit detecting element of the detector, and to divide the pixel value for the divided pixel by the magnification (S) (N) x magnification (S) pixel values by calculating the average value obtained by adding the pixel values obtained through the second scanning step and dividing by the magnification (S).

According to another aspect of the present invention, there is provided a bone mineral density measuring apparatus comprising: an X-ray generator for emitting X-rays; A detector having a plurality of unit detecting elements which are emitted from the X-ray generator and detect X-rays transmitted through the pid entities; A support for movably supporting the detector and the X-ray generator; And a control unit for controlling movement of the support unit and operation of the X-ray generator and the detector, wherein the controller moves the support unit in a sweeping direction and performs a scan operation by the detector and the X-ray generator The first scanning step and the detector are moved in the direction perpendicular to the sweep direction by a length corresponding to the width direction PW / magnification S of the unit detecting element, A second scanning step of controlling movement of the supporter, the X-ray generator and the detector so as to repeat the process of performing the scanning operation by the detector and the X-ray generator while moving the supporter S-1 times; The length of the detector corresponding to the total sum of the widthwise lengths PW of the unit detecting elements from the position of the detector at the time of performing one scanning process, And moving the support unit to move the detector and the X-ray generator in a direction perpendicular to the sweep direction, so as to perform a scanning operation on the pivot assembly.

According to the present invention, it is possible to provide a scanning method and a bone density measuring apparatus for detecting X-rays in a bone density measuring apparatus which can realize a high resolution at a low cost while maintaining a high measuring time.

1 is a view showing a conventional fan beam type dexterous bone densitometer.
FIG. 2 is a view for explaining a scanning method for detecting X-rays in the conventional BMD measuring apparatus shown in FIG. 1. FIG.
FIG. 3 is a diagram illustrating a configuration of an apparatus 100 for measuring bone density to perform a scanning method according to the present invention.
FIG. 4 is a view for explaining a scanning method for detecting X-rays in a bone mineral density measuring apparatus according to the present invention.
5 is a flowchart of a scanning method for detecting X-rays in a bone mineral density measuring apparatus according to the present invention.
6 is a flowchart illustrating a second scanning process.
FIG. 7 is a view for explaining a principle of obtaining each pixel value when a scan is performed according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, with reference to FIG. 2, a description will be given of a scanning method in a conventional BMD measuring apparatus.

FIG. 2 is a view for explaining a scanning method for detecting X-rays in the conventional BMD measuring apparatus shown in FIG. 1. FIG.

As shown in FIG. 2, in the conventional Fan Beam-type Dexa type bone densitometer, when the detector 10 including a plurality of detection unit elements 11 moves along the scan trajectory of the " And performs a scan operation to detect a line.

In FIG. 2, "sweep" means that the detector 10 detects X-rays emitted from the X-ray generator while moving, and it can be seen that the sweep is performed in the vertical direction as shown in FIG.

2, the detector 10 moves in the vertical direction sweep range, moves by the length of the detector 10 in the width direction, and again sweeps in the direction opposite to the immediately preceding sweep direction. Thus, The scan operation is performed while moving along the scan trajectory of the shape.

Next, a scanning method for detecting X-rays in the bone mineral density measuring apparatus according to the present invention will be described with reference to FIG. 3 and the following figures.

FIG. 3 is a diagram illustrating a configuration of an apparatus 100 for measuring bone density to perform a scanning method according to the present invention.

Referring to FIG. 3, a bone density measuring apparatus 100 for performing a scanning method according to the present invention includes a detector 10, an X-ray generator 20, and a controller 30.

The X-ray generator 20 emits X-rays, and the detector 10 detects the X-rays emitted from the X-ray generator 20 and transmitted through the body. Here, the detector 10 is composed of a plurality of unit detecting elements. The X-ray generator 10 and the detector 10 are movably supported on a support (not shown) formed in a " C "shape as shown in Fig.

The control unit 30 controls the movement of the X-ray generator 20, the detector 10 and the support unit and controls the overall operation of the X-ray generator 20 and the detector 10. [ The control unit 30 controls the movement of the detector 10 and the X-ray generator 20 related to the present invention by moving the supporting unit.

Here, the basic outline and structure of the bone mineral density measuring apparatus 100 according to the present invention are similar to those of a conventional fan-beam type dexterous bone densitometer as shown in FIG. 1, and thus detailed description thereof will be omitted.

FIG. 4 is a view for explaining a scanning method for detecting X-rays in the bone density measuring apparatus according to the present invention, and FIG. 5 is a flowchart of a scanning method for detecting X-rays in the bone density measuring apparatus according to the present invention.

Referring to FIG. 4, a scanning method according to the present invention is a method in which a detector 10 performs a first sweep downward, and then detects a width direction length of a unit detecting element 11 constituting a detector 10 (2nd sweep) and a third sweep (third sweep) while moving the detector 10 in a direction perpendicular to the sweep direction by a value obtained by dividing the first sweep PW by the magnification S, The scan is performed by repeating the process of moving the position of the detector 10 in the entire width direction of the detector 10 and again performing the first, second and third sweeps.

4 is for the case where the magnification S is 3 and the case where scanning is performed while moving the length PW in the width direction of the unit detecting element 11 of the detector 10 by a value equal to three .

4 and 5, first, the controller 30 moves the supporting part to move the detector 10 in the first sweep direction (downward direction in the drawing) So that the scan operation is performed by the detector 20 and the X-ray generator 10 (S100). This corresponds to the first sweep in FIG.

Next, the controller 30 controls the movement of the detector 20, the X-ray generator 10, and the supporting unit to perform the second scanning step. Here, as the second scanning step, The scan is performed while moving the scan electrode 10 by a value obtained by dividing the length PW in the width direction of the unit detection element by the magnification S, which corresponds to the second and third sweeps in FIG.

The second scanning process will be described in more detail with reference to FIG.

6 is a flowchart illustrating a second scanning process.

Referring to FIG. 6, the controller 30 moves the detector 10 in a direction perpendicular to the sweep direction by a length corresponding to the width direction PW / magnification S of the unit detecting element (S210). This is done by moving the support, and at this time the X-ray generator 10 also moves as much as the detector 10 moves.

4, since the magnification S is 3, the detector 10 moves in the right direction in Fig. 4 by a length obtained by dividing the width direction PW of the unit detecting element by three.

Next, the controller 30 causes the detector 10 and the X-ray generator 20 to perform a scan operation while sweeping in a direction opposite to the immediately previous sweep direction (S220). This is also accomplished by moving the support.

The control unit 30 determines whether the second scan step has been performed S-1 times (S230), and if not, repeats steps S210 and S220. If the determination is S-1 times, the flow advances to step S300.

In the case of FIG. 4, since the magnification S is 3, the second scanning step is performed twice, and when the second scanning step is performed twice, the processing moves to step S300.

5, in operation S300, the control unit 30 determines whether or not the entire length PW of the unit detecting element 11 in the width direction is greater than the position of the detector 10 at the time of performing the first scanning process The detector 10 and the X-ray generator 20 are moved in the direction perpendicular to the sweep direction by the length of the detector 10 corresponding to the sum. This is also achieved by the control unit 30 moving the supporting unit.

When this process is repeated, a scanning process of performing X-ray detection by the detector 10 and the X-ray generator 20 is performed while drawing the scan locus as shown in FIG.

Next, a process of obtaining a pixel value will be described with reference to FIG.

FIG. 7 is a view for explaining the principle of obtaining each pixel value when a scan is performed according to the present invention as described above.

FIG. 7 shows a case where the magnification S is 2, and the second scanning process is performed S-1 times, that is, once. In FIG. 7, the first sweep and the third sweep correspond to the first scanning process, and the second sweep and the fourth sweep correspond to the second scanning process.

In FIG. 7, since the detector 10 is composed of N unit detection elements 11, it is possible to obtain pixel values for a total of N pixels in one sweep. At this time, in the present invention, since the detector 10 is moved by the value obtained by dividing the detector 10 by the width direction PW / magnification (S = 2) of the unit detecting element 11 and scanning is repeated 7, additional pixel values can be obtained as indicated by 2nd sweep and 4th sweep. Therefore, by using the pixel values obtained at each sweep, pixel values of N × S times can be obtained with respect to the N unit detection elements 11, so that when the same unit detection element is used, .

In the case of Fig. 7, since S = 2, pixel values (2N) of S (= 2) times can be obtained for each unit detection element.

Accordingly, the controller 30 may calculate N × S pixel values using the pixel values obtained at each sweep after the second scanning process is completed.

In FIG. 7, since the magnification S = 2, S × N, that is, 2N pixel values can be obtained. Pixel 1 at the lower end of FIG. 7 uses the pixel value of the first unit detection element 11 as it is in the 1st sweep. The pixel value for pixel 2 can be obtained by adding the pixel value of the first unit detection element 11 of the first sweep and the pixel value of the first unit detection element 11 of the second sweep and then calculating the average value thereof. Similarly, the pixel value for pixel 3 can be obtained by calculating the pixel value of the second unit detection element 11 of the 1st sweep and the average value of the pixel values of the first unit detection element 11 of the 2nd sweep. By repeating this process, it is possible to acquire all the pixel values of 2N pixels in total.

That is, after performing the first and second scanning processes S100 and S200, the controller 30 divides the length PW in the width direction of the unit detecting element 11 of the detector 10 by the magnification S, A total of S x N pixels are formed, and the pixel value of each of the divided pixels is added to the pixel values obtained through the first and second scanning steps for each divided pixel, (N) × magnification (S) pixel values of the unit detecting elements can be obtained by calculating the pixel values of the unit detecting elements.

By performing the above process, the S × N pixel values can be obtained for the detector 10 constituted by the N unit detecting elements 11, so that the bone density measuring apparatus having the improved resolution can be realized.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

For example, in the above-described embodiment, pixel values are acquired after performing each cycle, but it is also possible to calculate pixel values after completing all cycles.

100 ... Bone density measuring device
10 ... Detector
20 ... X-ray generator
30 ... control unit

Claims (4)

An X-ray generator for emitting X-rays; A detector having a plurality of unit detecting elements which are emitted from the X-ray generator and detect X-rays transmitted through the pid entities; A support for movably supporting the detector and the X-ray generator; And a control unit for controlling the movement of the support unit and the operation of the X-ray generator and the detector, the method comprising:
A first scanning step of causing the controller to perform a scanning operation by the detector and the X-ray generator while moving the supporting part in a sweeping direction;
The controller moves the detector in the direction perpendicular to the sweep direction by a length corresponding to the width direction PW / magnification S of the unit detecting element, A second scanning step of controlling movement of the supporter, the X-ray generator and the detector so as to repeat the process of performing the scanning operation by the detector and the X-ray generator while moving the S-1 times; And
The controller controls the detector and the X-ray generator to sweep the detector and the X-ray generator by a length corresponding to a total sum of the widthwise lengths PW of the unit detecting elements from the position of the detector at the time of performing the first scanning process, A moving step of moving the supporting part to move in a direction perpendicular to a direction
And performing a scan operation on the pivotal tissue while repeatedly performing the scan operation.
The method according to claim 1,
After performing the second scan step,
The control unit obtains the pixel number (N) × magnification (S) pixel values of the unit detecting elements based on the pixel values obtained by the unit detecting elements of the detector through the first and second scanning steps Wherein the X-ray is detected by a bone mineral density measuring apparatus.
3. The method of claim 2,
Wherein,
(P) of the unit detecting element of the detector is divided by a magnification (S), and a pixel value of the divided pixel is divided into a plurality of divided pixels through the first and second scanning steps (N) x magnification (S) pixel values by calculating an average value obtained by adding the obtained pixel values and dividing by the magnification factor (S). Way.
In a bone mineral density measuring apparatus,
An X-ray generator for emitting X-rays;
A detector having a plurality of unit detecting elements which are emitted from the X-ray generator and detect X-rays transmitted through the pid entities;
A support for movably supporting the detector and the X-ray generator; And a control unit for controlling the movement of the support unit and the operation of the X-ray generator and the detector,
Wherein,
A first scanning step of performing a scanning operation by the detector and the X-ray generator while moving the supporting part in a sweeping direction; A step of causing the detector to move in a direction perpendicular to the sweep direction and moving the support in a direction opposite to the sweep direction immediately before the scanning operation is performed by the detector and the X- A second scanning step of controlling the movement of the supporting unit, the X-ray generator and the detector so as to repeatedly perform the first scanning process, and a second scanning step of moving the detector Ray generator so that the detector and the X-ray generator are moved in a direction perpendicular to the sweep direction by a length in the width direction of the detector corresponding to the sum Bone density measuring device, characterized in that while performing the step of repeating the same movement that performs the scanning operation for the collective efflorescence.
KR1020150069557A 2015-05-19 2015-05-19 Scanning method for detecting x-ray in bone density measuring device and measuring device KR101571030B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200025886A (en) 2018-08-31 2020-03-10 (주) 뉴케어 x-ray imaging method using variable imaging plane projection and x-ray imaging device applying the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050096527A1 (en) 2002-09-18 2005-05-05 General Electric Company Bone densitometer providing improved longitudinal studies
JP2011056257A (en) 2009-09-10 2011-03-24 General Electric Co <Ge> Transverse scanning bone densitometer and detector used in the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050096527A1 (en) 2002-09-18 2005-05-05 General Electric Company Bone densitometer providing improved longitudinal studies
JP2011056257A (en) 2009-09-10 2011-03-24 General Electric Co <Ge> Transverse scanning bone densitometer and detector used in the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200025886A (en) 2018-08-31 2020-03-10 (주) 뉴케어 x-ray imaging method using variable imaging plane projection and x-ray imaging device applying the same
KR102204515B1 (en) * 2018-08-31 2021-01-20 (주) 뉴케어 x-ray imaging method using variable imaging plane projection and x-ray imaging device applying the same

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