KR20210090963A - X-ray system and a controlling method of the same - Google Patents

Abstract

The present invention relates to an X-ray system and a control method thereof and, more specifically, to an X-ray system which to acquire an X-ray image at an optimal time in synchronization with a patient's respiration and a control method thereof. According to one embodiment of the present invention, the X-ray system comprises: an X-ray photographing apparatus obtaining an X-ray image of a patient by taking X-rays after a preparation time has elapsed when an X-ray photographing signal is generated; a sensing unit detecting a change in the respiration movement of the patient; and a respiration synchronization module calculating an inspiratory peak, an expiratory peak, and a respiratory cycle for the patient's respiration through a detection result of the sensing unit, determining an X-ray imaging time by reflecting calculation results, and generating an X-ray photographing signal when the time is earlier than the determined X-ray photographing time by a preparation time.

Description

X-ray system and a controlling method thereof

The present invention relates to an X-ray system and a control method thereof, and more particularly, to an X-ray system capable of acquiring an X-ray image at an optimal time in synchronization with a subject's respiration, and a control method thereof.

An X-ray imaging device is used as a medical device, and generates an X-ray image by radiating X-rays to the chest or abdomen of a subject. The acquired X-ray image is used to determine whether the subject has a disease or not. Therefore, it can be said that the quality of the image is very important.

The quality of an X-ray image has a very strong relationship with the subject's respiration when taking an X-ray. For example, chest X-ray imaging is preferably performed in a state in which the subject has maximally completed inhalation, and abdominal X-ray imaging is preferably performed in a state in which the subject has maximally completed exhalation.

Therefore, during actual X-ray imaging, it is common for the subject to perform breathing and stop breathing according to the instructions of the photographer (user).

However, in the case of specific subjects such as children or critically ill patients, it is difficult to expect to perform breathing and stop breathing according to the user's instructions. Therefore, in the case of a specific subject, there are many difficulties in obtaining an optimal X-ray imaging image. In addition to breathing, X-ray images acquired by crying, movement, etc. are inaccurate in many cases, requiring re-photography.

As a prior art for solving this problem, Japanese Patent Application Laid-Open No. 2004-57559 (published on February 26, 2004) discloses a "respiration synchronization X-ray imaging device".

Figure 1 is an overall configuration diagram showing a breathing synchronization X-ray imaging apparatus according to the prior art, Figure 2 is a block diagram showing the configuration of a laser rangefinder.

1 and 2, the respiratory synchronization X-ray imaging apparatus 1 according to the prior art includes a displacement amount measuring means for measuring the displacement amount with respect to the X-ray source of one body surface of the chest or abdomen of the subject 2; , Respiratory state detection means for detecting the respiration state of the subject 2 based on the displacement amount measured by the displacement amount measuring means, and a desired in the respiration cycle of the subject 2 detected by the respiration condition detecting means and X-ray radiation means for emitting X-rays in synchronization with a viewpoint.

In addition, in the respiratory synchronization X-ray imaging apparatus 1 according to the prior art, a laser distance measuring device 4 connected to the control circuit 3 is configured as the displacement amount measuring means, and the laser distance measuring device 4 is the subject ( 2) A laser oscillator 5 for projecting a laser beam onto the body surface of the chest or abdomen, a laser beam receiver 6 for receiving a laser beam reflected from the body surface, and a laser beam from projection to reception Calculate the distance from the laser distance measuring device 4 to the body surface of the subject 2 using the time difference calculating means 7 for calculating the time difference of , and the time difference calculated by the time difference calculating means 7 and a distance calculation means (8) for outputting to the control circuit (3).

The control circuit 3 processes the distance signal calculated and output by the distance calculating means 8 of the laser distance meter 4 into a waveform, and the breathing state of the subject 2, that is, the peak of the exhalation state (expiratory peak, That is, the end-expiratory state in which the chest or abdomen is most reduced by respiration) and the peak of the inspiratory state (inhalation peak, that is, the state of completion of inspiration in which the chest or abdomen is most enlarged by respiration) are detected.

Then, the generation time of the radiation signal is set before the actual X-ray emission point based on the expiration peak or the inspiration peak. For example, when the intake peak value is X, when the value measured by the laser distance meter 4 is X1, the X-ray radiation signal is generated. Here, X1 is determined as a function of the intake peak value X and the threshold Y value, and X1 is determined as a value obtained by multiplying X by (1+Y).

The threshold Y is a value input by the user and is seen to mean the time (preparation time) between the generation of the X-ray radiation signal and the time when the actual X-ray is emitted.

According to the prior art, an X-ray image can be obtained by generating a radiation signal before the intake peak in consideration of the preparation time and radiating the actual X-ray to the intake peak.

However, since the prior art considers only the expiration peak or the inspiration peak when determining the time of X-ray emission, there is a problem in that the accuracy with which X-rays can be emitted during the actual expiration or inspiration peak is lowered. In this case, the user is input by correcting the threshold Y, so it is not easy to obtain an optimal X-ray image at once.

An object of the present invention is to basically solve the problems of the conventional X-ray system.

An object of the present invention is to provide an X-ray system and a control method capable of obtaining an X-ray image by radiating X-rays at a more accurate time by calculating not only an expiratory peak or an inspiration peak, but also a respiratory cycle of a subject.

Through an embodiment of the present invention, an X-ray system and control capable of emitting X-rays at a more accurate time by matching the timing of generating the X-ray radiation signal and a specific detection value of the sensing unit for detecting a change in the subject's respiratory movement We want to provide a way

An object of the present invention is to provide an X-ray system and a control method through which a user can easily select whether to acquire an X-ray image at any one point of an exhalation peak or an inspiration peak of a subject.

An object of the present invention is to provide an X-ray system and a control method capable of obtaining a high-quality X-ray image regardless of a subject's cognitive ability.

In order to implement the above object, according to an embodiment of the present invention, when an X-ray photographing signal is generated, an X-ray photographing apparatus for obtaining an X-ray image of a subject by performing X-ray photographing after a preparation time has elapsed; a sensing unit for detecting a change in the subject's breathing movement; And calculate the inspiratory peak, the expiratory peak, and the respiratory cycle for the subject's respiration through the sensing result of the sensing unit, and determine the X-ray imaging time by reflecting the calculation result, and before the determined X-ray imaging time by the preparation time When the time point, an X-ray system including a breathing synchronization module for generating an X-ray imaging signal may be provided.

The X-ray imaging apparatus is provided to obtain an X-ray image by radiating X-rays. Since X-rays can be radiated through a very high voltage, the time points at which the X-rays are radiated and photographed are different from the time of the X-ray photographing signal. That is, the time interval between the time of the photographing signal and the actual photographing time may be referred to as the preparation time.

Therefore, the minimum preparation time may be a unique value according to the system, and if necessary, the actual preparation time may be set by the user to be greater than or equal to the minimum preparation time.

The respiration synchronization module may be configured to match a previous time point by the preparation time with a specific value of the detection result of the sensing unit, and generate the X-ray imaging signal when the detection result of the sensing unit is the same as the specific value.

That is, the X-ray imaging signal timing may be determined according to the sensing result of the sensing unit, rather than determining the X-ray imaging signal timing according to time. Therefore, the algorithm is simple and the processing capacity of the breathing synchronization module does not need to be large.

The sensing result of the sensing unit preferably includes sensing time information.

The sensing unit may sense various types of values such as distance, acceleration, and pressure. That is, it may be provided to sense a variable amount according to the subject's respiration. The sensing result of the sensing unit may include not only the sensed physical quantity but also a time point at which the physical quantity is sensed.

Accordingly, the respiration synchronization module may calculate the inspiratory peak and the expiratory peak through the amount of change with respect to the detection result of the sensing unit.

The respiratory synchronization module calculates the respiratory cycle through the time arithmetic average between the inspiration peak and the inspiration peak or the time arithmetic average between the expiration peak and the expiration peak after the inspiration peak and the expiration peak are calculated two or more times, respectively. there is.

In order to calculate a more accurate respiration cycle, the respiration synchronization module may calculate the respiration cycle after 3 times of inspiration and expiration peaks are calculated, respectively.

Preferably, the specific value has an inspiration specific value for an inspiration peak synchronization X-ray imaging and an expiration specific value for an expiration peak synchronization X-ray imaging.

The respiratory synchronization module, when the detection result of the sensing unit is the same as the specific inspiration value and the amount of change for the detection result of the sensing unit has a positive value, it is possible to generate a signal for the intake peak synchronization X-ray imaging. .

Here, it is preferable that the specific intake value is determined through an intake peak and a breathing cycle. That is, it is preferable that the generation time of the X-ray imaging signal is determined through the inspiratory peak and the respiratory cycle in the hopgi-peak synchronization X-ray imaging.

The breathing synchronization module, when the detection result of the sensing unit is the same as the specific expiratory value and the amount of change for the detection result of the sensing unit has a negative value, to generate a signal for the exhalation peak synchronization X-ray imaging. .

Here, the specific expiratory value is preferably determined through the expiratory peak and the respiratory cycle. That is, in the exhalation peak synchronization X-ray imaging, it is preferable that the generation time of the X-ray imaging signal is determined through the expiration peak and the respiratory cycle.

The preparation time may include an emission preparation time in which X-rays are emitted after generating the X-ray imaging signal and an exposure time in which the subject is exposed to X-rays so that the X-ray imaging is terminated before the inspiration peak or expiration peak.

Immediately after the expiration peak and the expiration peak, the physical quantity sensed by the sensing unit changes rapidly. Therefore, it is preferable to end the X-ray imaging before the end of the inspiration and expiration peaks.

It is preferable to further include a user interface for selecting an inspiration peak synchronization X-ray imaging and an expiration peak synchronization X-ray imaging, and inputting the preparation time.

The preparation time may include an emission preparation time in which X-rays are emitted after generating the X-ray imaging signal and an exposure time in which the subject is exposed to X-rays so that the X-ray imaging is terminated before the inspiration peak or expiration peak.

Here, the release preparation time and the exposure time may be inputted through the user interface, respectively. Here, the minimum time for the release preparation time may have a unique value for each system. Accordingly, the release preparation time may be inputted to be greater than or equal to the eigenvalue.

Preferably, the user interface includes an X-ray photographing button, and the sensing unit and the breathing synchronization module operate after the X-ray photographing button is selected.

In order to implement the above object, according to an embodiment of the present invention, in the control method of an X-ray system for obtaining an X-ray image of a subject by taking an X-ray after a preparation time has elapsed when an X-ray photographing signal is generated, the sensing result of the sensing unit Respiratory sensing step of detecting a change in the subject's breathing movement through; A preliminary step of calculating an inspiratory peak, an expiratory peak, and a respiratory cycle for the subject's respiration and determining an X-ray imaging time point; Matching the preparation time with a specific value of the detection result so that an X-ray imaging signal is generated at a time point earlier than the determined X-ray imaging time by the preparation time, and generating an X-ray imaging signal when the detection result is the same as the specific value preparation stage; And the control method of the X-ray system including the photographing step of performing the X-ray photographing after the lapse of the preparation time after the generation of the photographing signal may be provided.

The time of X-ray imaging is determined through the preparation time. That is, when the preparation time is determined, a time point at which the preparation time has elapsed may be referred to as an X-ray imaging time. Here, the preparation time may be calculated through an inspiratory peak or an expiratory peak and a respiration cycle. In other words, the preparation time is converted through the calculated inspiratory peak or expiratory peak value and the respiration cycle value, and the converted preparation time may be expressed in units of physical quantity, that is, the sensing result of the sensing unit, not in units of time.

Here, when the unit of the physical quantity is a meter, the converted preparation time may be referred to as a meter unit, and thus, when the sensing result of the sensing unit is the same as the converted preparation time, a photographing signal may be generated.

Of course, the sensing result of the sensing unit may be converted into a physical quantity into a current or voltage value. In this case, the inspiration peak or expiration peak and the respiratory cycle may also be converted into current or voltage values. Therefore, the converted preparation time can also be expressed as a current or voltage value in the same way.

Therefore, it is possible to easily match the detection result of the sensing unit and the time of generation of the shooting signal.

It may include a starting step of receiving a user's shooting button input, and may be performed from after the starting step to at least until the end of the preparation step.

In the starting step, any one of an inspiration peak synchronization X-ray photographing and an expiratory peak synchronization X-ray photographing for the subject's respiration may be received as an input. Accordingly, the user can easily select either the inspiration peak synchronization or the expiration peak synchronization. That is, it is possible to obtain an optimal X-ray image according to the photographing site.

According to an embodiment of the present invention, it is possible to provide an X-ray system and a control method capable of obtaining an X-ray image by emitting X-rays at a more accurate time by calculating not only an expiratory peak or an inspiration peak, but also the respiratory cycle of a subject.

Through an embodiment of the present invention, an X-ray system and control capable of emitting X-rays at a more accurate time by matching the timing of generating the X-ray radiation signal and a specific detection value of the sensing unit for detecting a change in the subject's respiratory movement method can be provided.

According to an embodiment of the present invention, it is possible to provide an X-ray system and a control method in which a user can easily select whether to acquire an X-ray image at any one point of an exhalation peak or an inspiration peak of a subject.

According to an embodiment of the present invention, it is possible to provide an X-ray system and a control method capable of obtaining a high-quality X-ray image regardless of a subject's cognitive ability.

1 is a block diagram of an X-ray system according to the prior art;
2 is a block diagram showing the configuration of a laser rangefinder according to the prior art;
3 is a block diagram showing the configuration of an X-ray system according to an embodiment of the present invention;
4 is a conceptual diagram illustrating a relationship between a subject's respiratory cycle, a photographing signal generation time, and a photographing time, which are applied to the X-ray system according to an embodiment of the present invention;
5 is a conceptual diagram numerically illustrating an expiration peak, an inspiration peak, a photographing signal generation time and photographing time according to a change in the subject's respiration, and
6 is a control flow illustrating a control method of an X-ray system according to an embodiment of the present invention.

Hereinafter, an X-ray system and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 shows the control configuration of the X-ray system according to an embodiment of the present invention.

The X-ray imaging apparatus 30 is configured to obtain an X-ray image by radiating X-rays to a subject. Such an X-ray imaging apparatus 30 may be the same as or similar to the X-ray imaging apparatus 30 in an embodiment of the present invention as in a conventional X-ray system. Therefore, a detailed description thereof will be omitted.

The X-ray system according to this embodiment preferably includes the sensing unit 20 .

The sensing unit 20 may be configured to detect a change in the subject's breathing movement.

While the subject is breathing, movement of the subject's body, particularly the chest and abdomen, occurs. These movements may cause a change in the volume of the chest or abdomen, or a change in the position of a specific point on the body based on the reference point.

In addition, the skin of the subject's body, particularly the chest and abdomen, may repeat tension and contraction while the subject is breathing. Thus, the stress applied to the skin itself while the subject is breathing can be changed. Of course, strain of the skin itself may occur while the subject is breathing.

It can be said that respiration is generally performed in a certain period between the inspiratory and exhalation peaks. That is, it can be said that the inspiratory and expiratory peaks have a respiratory cycle and are performed constantly. Inspiratory peak is the state in which the subject has inhaled the maximum, and the exhalation peak is the state in which the subject has exhaled the maximum breath.

Looking at the relationship between the deformation of the skin itself and respiration, it can be said that the skin deformation at the inspiratory peak is the maximum increase and the skin deformation at the expiratory peak is the maximum decrease. In addition, it is possible to examine the relationship between the change in the separation distance between the reference point spaced apart from the subject in the front of the subject's chest or abdomen and a specific point on the subject's chest or abdomen and respiration. In this case, it can be said that the separation distance at the inspiration peak is the minimum and the separation distance at the exhalation peak is the maximum.

Therefore, a physical quantity that varies according to the subject's respiration, for example, displacement, distance, stress change, acceleration change or pressure change can be expressed as a sinusoidal curve or a cosine curve between the inspiratory and exhalation peaks.

This means that the shape of the sensor constituting the sensing unit 20 can be changed in a very diverse way.

For example, the sensing unit 20 may be implemented through an optical sensor disclosed in the prior art, and the sensing unit 20 may be implemented through a strain-gage, coil sensor or acceleration sensor attached to the subject's body. could be Of course, in order to more accurately detect a change in the subject's respiration, the sensing unit 20 may be implemented through a plurality of sensors.

In addition, the sensing unit 20 may be provided in a band or belt for fixing the subject without being directly attached to the subject. When the subject is secured to an imaging position (eg, an imaging table) through a band or belt, the band or belt is brought into close contact with the user's body. Therefore, when the user's breathing changes, the stress generated in the band or belt is changed. It may be possible to detect a change in the subject's respiration through a change in stress or the like.

Sensing a change in the subject's breathing movement through the sensing unit 20 is for determining an optimal time to take an X-ray. That is, when X-rays are taken for subjects such as children or critically ill patients who cannot respond to the user's request, the X-rays are taken at the closest point to the expiration or inspiration peak to obtain an optimal X-ray image.

In this embodiment, it is preferable to include a respiration synchronization module 10 that calculates an inspiratory peak, an expiratory peak, and a respiration cycle for the subject's respiration through the result sensed by the sensing unit 20, that is, the sensing result.

The breathing synchronization module 10 may be referred to as a processor or a control unit, and calculates a change in the subject's respiration by using the detection result of the sensing unit 20, and uses this to enable X-ray imaging at an optimal time. It can be said that it is a configuration for controlling the driving of (30).

Specifically, the respiration synchronization module 10 is provided to calculate an inspiratory peak, an expiratory peak, and a respiration cycle by using the detection result of the sensing unit 20, and to determine an X-ray imaging time by reflecting the calculation result.

As described above, the X-ray imaging apparatus cannot perform X-ray imaging immediately after the imaging signal is generated. That is, X-rays cannot be radiated immediately after a photographing signal is generated. Of course, when the X-ray imaging apparatus is expensive, the time between the generation of the imaging signal and the X-ray imaging, that is, the preparation time may be reduced, but there is a physical limit in reducing this. This is because X-rays can be radiated only when a very high voltage is used.

Therefore, in many cases, it is common to have a preparation time of about 0.7 seconds to 1.8 seconds in the X-ray system.

In addition, the minimum preparation time of the X-ray system may be an eigenvalue, which may be referred to as a specification of the X-ray system. That is, it can be said that X-ray imaging is performed after the minimum preparation time has elapsed after the X-ray imaging signal is generated. If necessary, it may be possible to set the preparation time to be greater than the minimum preparation time. However, it can be said that it is not necessary to set the preparation time longer than the minimum preparation time for quick and accurate X-ray imaging.

In general, the X-ray imaging signal may be generated by the imaging button 41 included in the user interface 40 . That is, when the user presses the photographing button 41, a photographing signal is generated, and when the preparation time elapses, X-ray photographing is generally performed.

However, in this embodiment, it is preferable that the photographing signal is generated through the breathing synchronization module 10 without generating a photographing signal through the photographing button so that X-ray photographing can be performed in conjunction with the subject's breathing.

That is, it is preferable that the photographing signal is not generated by the user's input itself through a physical button, etc., and the breathing synchronization module generates the photographing signal algorithmically. In other words, it is preferable to generate a photographing signal in the breathing synchronization module so that the X-ray photographing is performed at the optimal time by interlocking with the subject's breathing and reflecting the preparation time.

When the breathing synchronization module 10 generates a photographing signal, the X-ray photographing apparatus 30 performs X-ray photographing after the lapse of the preparation time.

The user interface 40 may include an input unit 42 . Through the input unit 42, a user may input a preparation time or change a preset preparation time. As will be described later, the preparation time may be a time between when an X-ray is radiated after a photographing signal is generated. In addition, the preparation time may be the sum of the time between when the X-rays are emitted after the generation of the imaging signal and the time the subject is exposed to the X-rays.

Hereinafter, an implementation concept of an X-ray system and a control method according to an embodiment of the present invention will be described in detail with reference to FIG. 4 .

Respiratory movement of a subject (eg, a child) sensed through the sensing unit 20 may be represented in the form of a sinusoidal curve as shown in FIG. 4 . When X-rays are emitted and X-rays are photographed at the time of the intake peak, a photographing signal, that is, a photographing signal by an algorithm, must be generated in advance by reflecting the preparation time.

That is, when the user presses the photographing button, the breathing movement of the subject is detected through the sensing unit 20 , and the photographing time and the photographing signal generation time may be determined using the detection result.

In other words, by detecting the respiratory movement of the subject, for example, a future inspiration peak time may be predicted, and a photographing signal may be generated at a time prior to the preparation time than the predicted time point.

Here, the prediction of the inspiratory or expiratory peak timing, that is, the prediction of the imaging timing is very important. That is, it is important to ensure that the predicted timing of the inspiratory or expiratory peak to be actually generated is the same as possible. In addition, when the prediction time is predicted very accurately, it is very important to generate a photographing signal at a time prior to the preparation time very accurately from the predicted time point.

According to the present embodiment, prediction of a photographing time, that is, determination of a photographing time, can be performed very accurately, and a photographing signal can be generated very accurately at a time prior to the preparation time at the determined photographing time.

Hereinafter, a method of controlling an X-ray system according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 6 .

Figure 5 shows the relationship between the subject's breathing change and the preparation time, Figure 6 shows the control flow and formula.

Figure 5 (a) shows the process of calculating the exhalation peak and the respiratory peak while detecting the change in respiration, Figure 5 (b) is after the detection of the change in respiration to determine the photographing time, and the recording signal generation time for the determined photographing time It shows the process of determining

Since the sensing unit 20 detects a change in the subject's breathing movement, the sensing result of the sensing unit 20 is a physical quantity, and the sensed physical quantity changes because the breathing movement changes. These changes can be modeled in sinusoidal form.

If the sensed physical quantity is b, the sensing result is continuously output, so the physical quantity can be called _{b n .} Here, n is a natural number and it can be said that the result is output order.

The detection result may include a time at which the detection result is output. If this is called a, then the time point of _{b n} can be called _{a n .} Therefore, the detection result may be expressed as _{(a n} , b _{n ).}

The present embodiment basically includes a step (S10) of obtaining a result sensed by the sensing unit 20 .

Respiratory synchronization module 10 may perform a step (S15) of calculating the amount of change through the detection result. The change amount indicates how much the current detection result has changed with respect to the previous detection result. If the current change amount is d _n , the change amount can be expressed as _{(b n -} b _n-1 )/(a _{n -} a _{n-1 ).}

Therefore, through the change amount calculation step, the respiratory synchronization module is (a _n , b _n , d _n ) is obtained.

When the change amount d _n is positive, it means that the detection result is increasing, and when it is negative, it means that the detection result is decreasing. Therefore, it is possible to calculate the inspiratory peak and the expiratory peak (S40, S45) through the determination of the change amount transition (S30, S35). That is, the sensing result at the time of the inspiration peak and the sensing result at the time of the exhalation peak can be known. The time between an inspiration peak and the next inspiratory peak or the time between an exhalation peak and the next exhalation peak can be referred to as a respiration cycle or a respiration cycle.

Here, when the order of the respiratory cycle is m, the inspiratory peak in the m cycle _{can be called (ah m} , bh _m ) and the expiratory peak can be called (al _m , bl _m ). In other words, the inspiratory and expiratory peaks are (a _n , b _n , d _n ) can be expressed as a specific value (time and physical quantity) through the judgment result of the value and the change amount.

After the inspiratory peak and the exhalation peak are calculated, the step of calculating the respiratory cycle ( S50 ) is preferably performed. The amplitude Ah at the inspiration peak and the amplitude Al at the expiration peak are preferably expressed as an arithmetic mean. This is because the amplitude of the actual inspiratory peak and the exhalation peak is inevitably different as the respiratory cycle progresses. Therefore, in order to more accurately calculate the amplitude at the time of the inspiration peak and the amplitude at the time of the expiratory peak, it is preferable to use the arithmetic mean.

Here, the amplitude at the inspiratory peak and the amplitude at the expiratory peak may be calculated using the respiratory cycle between two inspiration peaks or the breathing cycle between the two expiration peaks. However, in order to calculate a more accurate amplitude, it is preferable to calculate the amplitude using a breathing cycle between three inspiration peaks or a breathing cycle between three expiration peaks.

Therefore, the amplitude Ah at the inspiration peak _{can be expressed as (bh m} + bh _m-1 + bh _m-2 )/m as the arithmetic mean, and the amplitude Al at the expiration peak is the arithmetic mean (bl _m + bl _{m-) 1} + bl _m-2) .

The total amplitude A, that is, the distance between the amplitude at the inspiratory peak and the amplitude at the expiratory peak can be expressed as Ah - Al.

In addition, the respiratory cycle T _{can also be expressed as (ah m} - ah _m-2 )/(m-1) as an arithmetic mean.

In other words, the respiratory synchronization module 10 calculates an inspiration peak, an expiration peak, and a breathing cycle. Here, it is preferable to calculate the inspiratory peak, the expiratory peak and the respiratory cycle through an arithmetic mean. In addition, it is preferable to calculate more accurate inspiratory peak, expiratory peak and respiratory cycle through arithmetic mean when at least three inspiration peaks or expiration peaks are detected.

When the inspiratory peak, the expiratory peak, and the respiratory cycle are calculated, the timing of the subsequent inspiratory peak and/or the expiratory peak may be determined.

For example, a time point at which a time equivalent to a respiration cycle has elapsed from the point at which the current inspiration peak is sensed may be determined as the next inspiration peak. If X-ray imaging is performed in conjunction with an intake peak, the next intake peak time may be referred to as an X-ray imaging time.

As an example, a time point at which time as much as a respiration cycle has elapsed from a point in time at which the current expiration peak is sensed may be determined as the next expiration peak. If the X-ray imaging is performed in conjunction with the expiratory peak, the next expiration peak time may be referred to as the X-ray imaging time.

In this embodiment, in order to determine the generation time of the X-ray imaging signal, calculating a time prior to the determined X-ray imaging time by a preparation time (S60) may be included.

As described above, the preparation time is a specific time and may be a value set by the user or a unique value of the system. That is, it can be called a time unit value.

In this embodiment, it may include a step (S60) of changing the preparation time having a time unit through the exhalation peak or inspiration peak value and the respiratory cycle value. As described above, the values of the exhalation peak, the inspiration peak, and the respiratory cycle may be calculated or determined using the sensing result of the sensing unit.

When the preparation time is P, AhC at the time of generating the inspiratory peak interlocking imaging signal can be called Ah - Asin (2πP/T). In addition, the timing of generating the exhalation peak-linked imaging signal AlC can be said to be Al + Asin (2πP/T).

That is, instead of generating a photographing signal through the passage of time, the photographing signal may be generated when the value detected by the sensing unit, that is, the value detected in step S15 is a specific value of AhC or AlC.

Meanwhile, in the present embodiment, a user setting step (S10) may be included. The user setting step may be a step in which the user presses the photographing button 41 . That is, when the user presses the shooting button 41, the sensing unit 20 detects a change in the subject's respiration (S15) may be performed. This respiration change detection step (S15) may be continuously performed until the photographing signal generation (S80) step is performed.

As described above, in this embodiment, the step (S60) of replacing the preparation time with a physical value sensed by the sensing unit rather than the unit of time is performed. This can be referred to as a step of correcting the preparation time with the value detected by the sensing unit.

After the preparation time is corrected to the value detected by the sensing unit (S60), steps (S70, S75) of determining whether the corrected preparation time and the value detected by the sensing unit match may be performed.

In this determination step, it may also be determined whether to generate a photographing signal in association with the exhalation peak or whether to generate a photographing signal by interworking with the inspiration peak.

For example, in the user setting ( S10 ) step, the step of the user selecting whether the imaging is linked to an exhalation peak or an inspiration peak linked to imaging may be performed. That is, the user can select any one of the two through the input unit 42 . This may be called S, and when S is 0, it may be an inspiratory peak-linked imaging, and when S is 1, it may be an expiratory peak-linked imaging.

In the determination step S70, when S is 0, the amount of change is positive, and the detection value bn of the sensing unit is equal to AHC, a photographing signal is generated (S80). The generation of the photographing signal is not generated by the user pressing a physical button or the like, but is generated algorithmically.

In the determination step 9.S75), when S is 1, the amount of change is negative, and the sensing value bn of the sensing unit is equal to Alc, a photographing signal is generated (S80).

When a photographing signal is generated, photographing is performed after the preparation time P has elapsed. That is, it can be said that the role of the breathing synchronization module 10 is up to the generation of the photographing signal, and performing the photographing after the generation of the photographing signal is the role of the X-ray photographing apparatus 30 .

In this embodiment, the preparation time P is matched with the detection value of the sensing unit rather than the unit of time, and thus, the generation time of the photographing signal can be said to be the same as the value detected by the sensing unit with the specific value. Therefore, it can be said that the sensing unit is sensed at a very short time interval, for example, in units of microseconds, and the generation time of the photographing signal is determined through the sensing value of the sensing unit.

On the other hand, the preparation time in the user setting (S10) step may include a time in consideration of the margin for the intrinsic value of the system and a time during which the actual X-ray is exposed to the subject.

That is, the preparation time P may be expressed as the sum of the time P1, which is the time between the time of X-ray imaging after the generation of the imaging signal, and E, which is the time during which the actual X-rays are exposed after the imaging starts. Here, the values of P1 and E may be input by the user through the input unit 42 .

Here, the exposure time E may be set by the user in consideration of the subject's condition or age. In addition, considering the exposure time E means that X-ray imaging can be terminated before the expiration or inspiration peak.

Immediately after the exhalation peak or the inspiratory peak, the sensing value of the sensing unit changes significantly. In other words, it may be difficult to obtain a high-quality image when X-ray imaging is performed until just after the expiration or inspiration peak. Therefore, by dividing the preparation time P component into the actual preparation time P1 and the exposure time E, and allowing the user to input P1 and E, the X-ray imaging can be finished before the expiration peak or the inspiration peak. In this case, AHC, which is the time of generating the inspiratory peak imaging signal, and Alc, which is the time of generation of the expiratory peak imaging signal, are determined using P1 and E.

As described above, according to an embodiment of the present invention, the generation time of the photographing signal may be determined using the respiration peak or the inspiratory peak and the respiration cycle. In addition, the generation time of the photographing signal may be determined by matching it with a specific value sensed by the sensing unit, not in units of time. Therefore, it is possible to perform X-ray imaging at a more accurate time by minimizing an immediate and temporal error.

The above-described embodiment is an embodiment of the present invention. Therefore, the present invention is not limited by the embodiments disclosed herein, and all forms that can be changed by a person of ordinary skill in the art to which the present invention pertains will also fall within the scope of the present invention.

10: breathing synchronization module
20: sensing unit
30: X-ray imaging device
40 : User Interface
41: shooting button
42: input unit

Claims (15)

an X-ray imaging device for acquiring an X-ray image of a subject by taking an X-ray after a preparation time has elapsed when an X-ray imaging signal is generated;
a sensing unit for detecting a change in the subject's breathing movement; And
Inspiratory peak, expiration peak, and respiration cycle for the subject's respiration are calculated through the sensing result of the sensing unit, and the X-ray imaging time is determined by reflecting the calculation result, and the preparation time is earlier than the determined X-ray imaging time. When, an X-ray system including a breathing synchronization module for generating an X-ray imaging signal. The method of claim 1,
The breathing synchronization module, X-ray, characterized in that the previous time by the preparation time is matched with a specific value of the detection result of the sensing unit, and generates the X-ray imaging signal when the detection result of the sensing unit is the same as the specific value system. 3. The method of claim 2,
The detection result of the sensing unit X-ray system, characterized in that it includes detection time information. 4. The method of claim 3,
The respiratory synchronization module X-ray system, characterized in that for calculating the inspiratory peak and the expiratory peak through the amount of change with respect to the detection result of the sensing unit. 5. The method of claim 4,
The respiration synchronization module calculates the respiratory cycle through the time arithmetic average between the inspiration peak and the inspiration peak or the time arithmetic mean between the expiration peak and the expiration peak after the inspiration peak and the expiration peak are calculated two or more times, respectively. Characterized by an X-ray system. 5. The method of claim 4,
The specific value is an X-ray system, characterized in that it has an inspiration specific value for an inspiratory peak synchronization X-ray imaging and an expiration specific value for an expiratory peak synchronization X-ray imaging. 7. The method of claim 6,
The respiratory synchronization module, when the detection result of the sensing unit is the same as the intake specific value and the amount of change for the detection result of the sensing unit has a positive value, generating a signal for the intake peak synchronization X-ray imaging, characterized in that an x-ray system. 7. The method of claim 6,
The respiration synchronization module, when the detection result of the sensing unit is the same as the specific expiration value and the amount of change for the detection result of the sensing unit has a negative value, generating a signal for the expiration peak synchronization X-ray imaging, characterized in that an x-ray system. 9. The method according to any one of claims 1 to 8,
X-ray system, characterized in that the preparation time includes an emission preparation time in which X-rays are emitted after the X-ray imaging signal is generated and an exposure time in which the subject is exposed to X-rays so that the X-ray imaging is terminated before the inspiration peak or expiration peak . 9. The method according to any one of claims 1 to 8,
X-ray system, characterized in that it further comprises a user interface for selecting the inspiration peak synchronization X-ray imaging and the expiration peak synchronization X-ray imaging, and inputting the preparation time. 11. The method of claim 10,
X-ray system, characterized in that the preparation time includes an emission preparation time in which X-rays are emitted after the X-ray imaging signal is generated and an exposure time in which the subject is exposed to X-rays so that the X-ray imaging is terminated before the inspiration peak or expiration peak . 12. The method of claim 11,
The user interface includes an X-ray photographing button, and after the X-ray photographing button is selected, the sensing unit and the breathing synchronization module operate. In the control method of an X-ray system for obtaining an X-ray image of a subject by taking an X-ray after a preparation time has elapsed when an X-ray imaging signal is generated,
Respiratory sensing step of detecting a change in the subject's breathing movement through the sensing result of the sensing unit;
A preliminary step of calculating an inspiratory peak, an expiratory peak, and a respiratory cycle for the subject's respiration and determining an X-ray imaging time point;
Matching the preparation time with a specific value of the detection result so that the X-ray imaging signal is generated at a time point earlier than the determined X-ray imaging time by the preparation time, and generating an X-ray imaging signal when the detection result is the same as the specific value preparation stage; And
The control method of an X-ray system including a photographing step of performing X-ray photographing after the preparation time has elapsed after generating the photographing signal. 14. The method of claim 13,
A method of controlling an X-ray system, comprising a starting step of receiving a user's shooting button input, and being performed from after the starting step to at least until the end of the preparation step. 15. The method of claim 14,
In the starting step, the control method of the X-ray system, characterized in that any one of an inspiratory peak synchronization X-ray photographing and an expiratory peak synchronization X-ray photographing for the subject's respiration is received.

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