JP2004073490A - Roentgenography apparatus, roentgenography method, and computer readable storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moving video the frame rate of which is higher and the movement is smooth when diagnosing, and to provide the moving video with which the diagnosis of a subject is easy to perform, and the storage volume of which is reduced and the frame rate is optimal, even at the time of storage and reproduction. <P>SOLUTION: A perspective image is continuously obtained by an ecological movement by the pulsation of the heart and the respiration of the subject 501, or by the movement of the subject 501 obtained by image processing analysis of the perspective image, and the ecological movement of the pulsation of the heart and the respiration of the subject 501. Then, the frame rate is changed in preserving of the perspective image continuously obtained in such manners. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an X-ray imaging apparatus, an X-ray imaging method, and a computer-readable storage medium, and is particularly suitable for use in continuously capturing an X-ray transmission image of a subject.
[0002]
[Prior art]
In recent years, with the advancement of X-ray detection technology and image processing technology, medical image diagnostic apparatuses have become widespread from conventional analog imaging using film to digital images.
[0003]
Starting with the X-ray CT apparatus, film digitizers, MRI utilizing nuclear magnetic resonance, and the like have been developed. Furthermore, recently, a digital imaging device using a flat panel was developed in the field of simple imaging, which was said to be difficult to digitize due to the need for wide latitude, high resolution, and special image processing for each part. Have been.
[0004]
In the field of cardiovascular imaging, imaging was conventionally performed on 35 mm cine film. However, with the development of a high-definition TV camera, diagnosis is performed by digitizing the image and performing image processing.
As a conventional example, FIG. 9 shows a block diagram of a television camera and a cardiovascular diagnostic system.
The X-ray tube 502 is controlled by the control signal from the image processing device 505 via the X-ray control unit 512, X-rays are emitted from the X-ray tube 502, and X-rays transmitted through the subject 501 on the bed 508 are transmitted. The intensity of the line is converted into light by an image intensifier (hereinafter abbreviated as II, if necessary) 503 and photographed by a television camera 504.
[0005]
The pulse width and pulse interval of the X-rays to be irradiated are adjusted using a pulse as shown in FIG. 10 so that unnecessary irradiation is not performed on the patient. An image is acquired in synchronization with the X-ray pulse. Simultaneously with imaging, a contrast agent is injected into a blood vessel to be treated by the injector 509.
[0006]
The video signal of the television camera 504 is digitized by the A / D converter 510, converted into an easily viewable image by the image processing device 505, then converted into an analog signal by the D / A converter 511, and displayed on the display device 507. A digital image is generated at a frame rate of 50 to 100 (frames / second) in order to observe the motion of the coronary artery, the heart, and the pulmonary artery surrounding the heart.
[0007]
At the same time as the photographing, the digital image data in the image processing device 505 is stored in the image memory. The image data of the patient to be diagnosed again later is transferred and stored in an image memory or a recording medium having a large storage capacity such as a hard disk.
[0008]
Recently, the demand for downsizing of the apparatus from the user and the improvement of the flat panel as the X-ray detection device have raised the frame rate of image acquisition, so that an imaging system in which the flat panel is mounted on the detection unit has also been developed. .
[0009]
In this photographing system, I.I. I. This eliminates the need for an A / D converter or the like, thereby saving space and reducing image noise and reducing irradiation dose.
[0010]
By using these systems, an image can be observed at the same time as photographing, and a development time is not required in the case of a cine film, so that a quick inspection can be performed and a failure can be prevented.
Documents describing this type of device include, for example, Image Analysis Vol 1.9 No. 1 1989, p. 17-18 "Arteriography" and JP-A-2-249534.
[0011]
[Problems to be solved by the invention]
However, when all images obtained at a fixed frame rate set in advance are stored in a large-capacity recording medium, useless images may be generated when the movement of the examination object such as the coronary artery or the heart or the pulmonary artery surrounding the heart is slow. There was a problem that would be saved.
For this reason, if the frame rate is reduced uniformly and the frames are thinned out and stored, a problem occurs in which a smooth moving image cannot be obtained in a fast moving scene.
[0012]
In addition, the method of changing the pulse interval of X-ray irradiation and changing the frame rate of the acquired image has the advantage of not irradiating the subject with extra X-rays, but also requires control of X-ray irradiation, so that the apparatus must be controlled. And the timing of changing the frame rate is difficult, and the possibility of missing required shots increases.
[0013]
The present invention has been made in view of the above problems, and has a means for changing and storing a frame rate at the time of image acquisition according to the pulsation of the subject's heart and an ecological movement due to respiration, so that the frame rate is higher at the time of diagnosis. It is an object of the present invention to provide a moving image with a smooth motion and to provide a moving image with an optimum frame rate with which the subject can be easily diagnosed during storage and reproduction and the storage capacity is reduced.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, the subject's heart pulsation, the movement of the subject obtained by image processing analysis of the fluoroscopic image or the pulsation of the subject's heart, The apparatus is characterized in that it has means for changing a frame rate in storage of the continuously acquired fluoroscopic images according to ecological movements caused by breathing.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
(First Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the system according to the present embodiment has an electrocardiograph 10 added to the conventional system shown in FIG. 9, and has an image intensifier (II) 503 and a television camera. Instead of 504, a flat panel detection unit 1 is mounted.
[0016]
The flat panel detection unit 1 has sensitivity to X-rays, a solid-state imaging device that converts and outputs an electric signal corresponding to the intensity of the detected X-rays, or absorbs energy of X-rays and has an intensity corresponding to the absorption. The analog signal from these elements is digitized by A / D conversion using a unit that combines a fluorescent substance that emits fluorescent light and a photoelectric conversion element that is sensitive to visible light and converts it into an electric signal corresponding to the intensity. It is a unit that works to capture.
[0017]
Such a digital X-ray imaging apparatus includes an inspection module including a detection device that detects an electric quantity corresponding to an X-ray transmitted dose and converts it into a digital quantity, and a control module for controlling the inspection module and the X-ray generator. It consists of a device.
This digital X-ray imaging apparatus, a monitor or printer for displaying a captured image, and a storage as a large-capacity recording medium are often referred to as an X-ray imaging system.
[0018]
In a digital X-ray imaging system, digital image data from an examination module is sent to a control device, where various image processing is performed to obtain an X-ray digital image for a doctor to diagnose.
[0019]
The created X-ray digital image is burned on a film from a printer or displayed on a monitor as necessary, and diagnosed, and is stored in a storage for later re-diagnosis.
[0020]
In FIG. 1, reference numeral 11 denotes an electrocardiographic waveform capturing unit which captures an electrocardiographic waveform obtained by the electrocardiograph 10. Reference numeral 108 denotes an X-ray imaging system operation / input / display unit (hereinafter, referred to as an operation / display unit as necessary), which displays a system status and a message and serves as an information input unit and an operation unit. I have.
[0021]
Reference numeral 110 denotes a network to which HIS (hospital information system), RIS (intra-radiation information system), PACS (image diagnostic system), and the like are connected. A storage 111 is a large-capacity recording medium connected to the network.
[0022]
502, an X-ray tube for irradiating X-rays; 512, an X-ray control unit for controlling X-ray irradiation; and 102, a console of the X-ray control unit. Reference numeral 1 denotes a detection device that detects X-rays transmitted through the subject 109.
[0023]
A control unit 14 of the X-ray imaging system sends an X-ray generator control parameter to the X-ray control unit 512 to perform X-ray irradiation control, and acquires digital image data obtained from the detection device 1. The desired image processing is performed, the image display is controlled by the operation / display unit 108, and the image is stored in the image memory 506 and the ECG waveform captured by the ECG waveform capturing unit 11 is stored in the storage 111. It has the function of changing the frame rate.
[0024]
FIG. 2 is a diagram in which the electrocardiogram waveform, aortic pressure, left ventricular pressure, X-ray exposure timing, and frame rate stored in the storage 111 are displayed in the same time direction. The electrocardiograph 10 acquires a potential difference generated due to a heartbeat as an electrocardiographic waveform. Since the beating myocardium automatically performs a rhythmic contraction, a stimulus preceding the contraction is generated in the stimulation conduction system of the heart.
[0025]
These stimuli excite myocardial fibers and generate weak currents in the body. An electrocardiogram can be obtained by placing conductors at predetermined various sites on the body surface and connecting these conductors to an electrocardiograph. Since the conduction speed and conductivity of the current are different for each part, the waveform of the excitation is different for each part.
FIG. 2 (2) shows an example of an electrocardiographic waveform. The first small waveform (P) indicates atrial muscle excitation, the rapidly changing high-amplitude waveform R indicates ventricular excitation, and the gentle waveform T appearing slightly later indicates the state of ventricular muscle repolarization. Represent and indicate ventricular recovery.
[0026]
The heart beats at intervals of about one second by the ventricle and the atrium repeatedly contracting and expanding almost simultaneously. A phase in which the muscles of the ventricle contract and pumping blood is called a systole, and a phase in which the ventricle relaxes and blood flows from the atrium into the ventricle is called a systole.
[0027]
As shown in the graph of aortic pressure and intraventricular pressure shown in (1) of FIG. 2, the change in blood pressure at the time of contraction and at the beginning of relaxation (from the waveform R to the waveform T in the electrocardiogram) is large, and the movement of the heart is also intense. Has become.
[0028]
On the other hand, after the middle period of the systole (from the waveform T to the next waveform R in the electrocardiogram), the change in blood pressure is slow, and the movement of the heart is slow compared to the systole. Therefore, in the section in which the movement of the heart is slow, the smoothness of the movement is hardly impaired even if the frame rate is reduced.
[0029]
FIG. 2C shows an X-ray exposure interval at about 50 frames / second, and indicates that images are continuously taken into the X-ray imaging system controller 14 at this interval. FIG. 2D illustrates a frame rate when an image is stored in the storage 111.
[0030]
From the electrocardiogram shown in (2) of FIG. 2, the section from R to T where the heart moves rapidly is performed at the frame rate (50 frames / second) at the time of imaging, and the section from T to R where the heart moves slowly is performed. Sections are stored at half the frame rate at the time of shooting (25 frames / second).
[0031]
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS.
After confirming the patient's name, the doctor or radiologist transmits the patient information (ID) to the X-ray imaging system from the X-ray imaging system operation / input / display unit 108 or the HIS or RIS connected via the network 110. , Name, date of birth, etc.), shooting conditions, image processing parameters for the acquired image, and the like.
[0032]
A physician or radiologist positions the patient and attaches the electrocardiograph lead to a predetermined site. A contrast agent is injected into a cardiovascular vessel by the injector 509, and an X-ray irradiation switch near the console 102 of the X-ray control unit 512 is pressed to start imaging.
[0033]
Synchronized with the X-ray of a continuous pulse wave as shown in FIG. 2 (3) emitted from the X-ray tube 502, the X-ray passes through the subject 109 and is converted into an electric quantity by the flat panel detection unit 1. After conversion, amplification by an amplifier, signal processing such as A / D conversion, and the like, the image processing unit 12 takes in the digital image.
[0034]
The image captured by the control unit 14 of the X-ray imaging system is further subjected to various image processing such as gradation processing and emphasis processing, and is displayed on the operation / display unit 108 of the X-ray imaging system. Is stored in
[0035]
On the other hand, the electrocardiographic waveform measured by the electrocardiograph 10 is captured by the electrocardiographic waveform capturing unit 11 in synchronization with the X-ray pulse. From the measured values captured by the electrocardiographic waveform capturing unit 11 and the electrocardiographic waveform obtained by measuring the measured values, the motion of the heart is predicted, and the frame rate is changed as shown in FIG. The image is stored in the storage 111.
[0036]
FIG. 3 shows a flow of processing of the control unit 14 of the X-ray imaging system. The variable ShotTime in the flow indicates the imaging time, and indicates a variable that increases at each X-ray exposure interval.
[0037]
TPSaveTime indicates the image capturing time of the image to be stored between T and P of the electrocardiographic waveform, and the frame to be stored is given by (frame / sec) in order to obtain the image capturing time of the next image to be stored when the image is stored. Add the reciprocal of the rate. That is, during the period from T to P of the electrocardiographic waveform, if the imaging time ShotTime is equal to or longer than TPSaveTime, the image is also output to the storage 111.
[0038]
When the photographing is started, the photographing time ShotTime and the photographing time TPSaveTime of the image stored between T and P are initialized to 0 (step S100). Then, it is determined whether or not the imaging has been completed (step S101). If the imaging has not been completed, the measured value from the electrocardiograph and the X-ray transmission image are acquired in synchronization with the X-ray pulse (step S102). .
[0039]
Then, gain correction, shading correction, and black correction are performed on the obtained image (step S103), and the image is stored in the image memory (step S104). If the measured value from the electrocardiograph is not included in the R to T sections of the electrocardiographic waveform, the image subjected to various corrections is stored in the storage 111 (step S106). If the imaging time TPSaveTime is not 0, , And 0 (steps S107 and S108), and proceeds to step S109 described later.
[0040]
When the measured value from the electrocardiograph is included in the R to T sections of the electrocardiographic waveform, the processing of steps S110 to S114 is performed. If the photographing time TPSaveTime is 0, the photographing time ShotTime is substituted for TPSaveTime (steps S110 and S111). If not, the process proceeds to the next step S112 without doing anything.
[0041]
If the photographing time ShotTime is equal to or longer than the photographing time TPSaveTime of the image to be stored between T and P, the reciprocal of the rate at which the image is stored in the photographing time TPSaveTime is calculated in order to store the image in the storage 11 and then determine the photographing time to be stored next. In addition (steps S112, S113, S114), otherwise, the process proceeds to step S109 without doing anything.
[0042]
In step S109, an exposure interval is added to the photographing time ShotTime in order to obtain the next exposure time. The storage frame rate is preferably a divisor of the reciprocal of the exposure interval so that there is no error in the storage rate in the storage 111.
[0043]
In this embodiment, the movement of the heart was predicted using an electrocardiograph, and the frame rate when saving the image was changed.However, a small pickup was attached to the patient, and the movement in respiration was predicted. The frame rate at the time of storage may be changed.
[0044]
Further, although the timing is slightly shifted, the frame rate may be changed using the measured values of the aortic pressure and the intraventricular pressure without using the electrocardiograph 10 which precedes the heart beat.
[0045]
If it takes a long time to transfer the data to the storage, it can be solved by attaching a flag indicating whether or not the image should be stored in the storage 111 as information accompanying the image at the time of acquiring the image, or adding a measured value of the electrocardiogram.
[0046]
The flow shown in FIG. 4 is an example in which a flag indicating whether or not to save the information as information accompanying the image in the storage 111 is provided. At the time of photographing and image capturing, a flag indicating whether or not the image is to be stored in the storage is attached to the image memory 506 as information accompanying the image, and the flag is set among the images stored in the image memory 506 at the time of output. This can be achieved by storing only the current image in the storage 111.
[0047]
In steps S110 to S114 of the flow of FIG. 4, in the process of reducing the frame rate and storing in the storage in steps S110 to S114 of the flow of FIG. Is performed. The image can be stored in the storage 111 irrespective of photographing since it is sufficient to store the image in accordance with the storage flag.
[0048]
When acquiring an electrocardiogram measurement value as information accompanying the image at the time of image acquisition, this can be achieved by sequentially reading out from the image memory 506 at the time of output and performing the flow shown in FIG. 3 except for steps S102, S103, and S104. Therefore, no further details will be given.
[0049]
As in the first embodiment described above, by having means for changing the frame rate in the storage of the continuously acquired fluoroscopic images according to the pulsation of the subject's heart and the ecological movement due to respiration. At the time of diagnosis, a moving image having a higher frame rate and smooth motion can be obtained, and at the time of storage and reproduction, a moving image having an optimum frame rate which can be easily diagnosed and has a reduced storage capacity can be obtained.
[0050]
(Second embodiment)
FIG. 5 shows a heart portion extracted by image processing from an X-ray image of the heart portion. T0 to Tn indicate the imaging time, t indicates the imaging interval, and S0 to Sn indicate the area of the extracted heart.
[0051]
The area of the heart is defined as s when the imaging time is 0 second.
FIG. 6 shows a flow of the second embodiment, and FIG. 7 shows a comparison table of a storage rate corresponding to a heart area change rate.
This means that the storage rate to the storage is dynamically changed in accordance with the rate of change in the area of the heart of an image continuously captured in synchronization with X-ray irradiation.
[0052]
The top row of the correspondence table shown in FIG. 7 indicates that when the area of the heart fluctuates by 30% or more compared to the previously captured image, the saved frame rate and the frame rate at the time of capturing are the same. Means
These numerical values are experimentally obtained depending on the exposure interval and the imaging site. FIG. 8 shows a region where the heart extraction image processing is performed. In the section (P to T section) in which the electrocardiogram waveform of the heart in the movement of the heart in FIG. 2 is sharp, the area where the image processing is performed is a rectangle which is 70% larger than the rectangle circumscribing the heart, as shown in (1) of FIG. In the section where the movement is slow (T to P section), the rectangle is a rectangle which is 20% larger than the rectangle circumscribing the heart as shown in (2) of FIG.
[0053]
The second embodiment will be described below with reference to FIGS. 1 and 2 and FIGS. As in the first embodiment, after the doctor or radiologist confirms the name of the patient, the doctor or radiologist operates the X-ray imaging system operation / input / display unit 108 or the HIS or RIS connected via the network 110 The patient's information (ID, name, date of birth, etc.), imaging conditions, image processing parameters for the acquired image, etc. are set in the X-ray imaging system, the patient is positioned, and the electrocardiograph's conductor is specified. , The contrast agent is injected into the cardiovascular vessel by the injector 509, and the X-ray irradiation switch near the console 102 of the X-ray control unit 512 is pressed to start imaging.
[0054]
The image processing unit 12 captures the image as a digital image, performs various corrections, saves the image in an image memory, and performs image processing on the obtained X-ray image to extract a heart as shown in FIG.
[0055]
The area of the heart obtained in FIG. 5 is obtained from the image, and the heart area change rate per unit time | S / T | = | (Sn-Sn) is obtained from the difference ΔS from the area of the heart at the time of the previous imaging. -1) / (Tn-Tn-1) |
[0056]
Here, the absolute value is given because the degree of change is required. In accordance with the obtained heart area change rate | S / T |, a storage frame rate is obtained from a comparison table of storage rates corresponding to the heart area change rate in FIG. 7 and stored in the storage 111 at the frame rate. For this reason, it is possible to store the data in the storage 111 at a frame rate that matches the motion of the heart.
[0057]
In order to extract the heart, a sharpening process that emphasizes the high-frequency components of the obtained digital image is performed, the contour is emphasized, and then the threshold value method and a method of sequentially tracing the local maximum value of the differential image are used. Is used to extract the contour of the heart, determine the number of pixels in the contour, and use this as the heart area.
[0058]
At this time, if the heart extraction processing is performed on the entire screen of the acquired image, the processing becomes slow. Therefore, only the area near the heart is trimmed, and the processing is performed on this image. At this time, in the waveforms P to T of the electrocardiogram of FIG. 2 (2) where the heart movement is sharp, a region which is 70% enlarged of the circumscribed rectangle of the heart is trimmed as shown in FIG. In the T to P section where is slow, image processing can be applied only to a necessary area for trimming a 20% enlarged area of the circumscribed rectangle of the heart as shown in (2) of FIG. 8, and the processing speed increases.
[0059]
In the method using the electrocardiographic waveform, only the degree of change of the heart is known. Therefore, instead of the electrocardiographic waveform, a blood pressure waveform can be used as shown in (1) of FIG. In this case, a function obtained by differentiating the waveform of the left ventricular blood pressure shown in (1) of FIG. 2 is obtained, and the magnitude of the trimming is changed according to this value. When the heart is contracting, the differential value is also negative, so that the trimming area is small and the processing speed is improved.
[0060]
FIG. 6 shows a flow of the second embodiment. SaveTime is used instead of TPSave shown in FIG. When saving an image at a speed other than the frame rate for capturing an image, the image is saved for a shooting time indicated by SaveTime.
[0061]
Steps having the same numbers as those in FIG. 3 indicate that the same processing is performed. In step S121, the image is corrected and stored in the image memory, and then the heart is extracted by image processing, and the area of the heart and the rate of change of the heart are obtained (step S122).
[0062]
When the rate of change of the heart shown in the correspondence table of FIG. 7 is the maximum (0.5 / t), the storage rate matches the frame rate of image capture synchronized with exposure (steps S123, S106, S107, and S108). ).
[0063]
On the other hand, if the frame rate does not match the frame rate of image capturing synchronized with the exposure, the image is stored at steps S110, S111, S112, S113, and S124 at the frame rate according to the correspondence table of FIG. Note that the saved frame rate in step S124 is the saved frame rate obtained from the heart area change rate in the correspondence table in FIG.
[0064]
As described above, as described in the second embodiment, an image can be stored in the storage 111 at a frame rate that matches the motion of the heart.
[0065]
(Another embodiment of the present invention)
In order to operate various devices to realize the functions of the above-described embodiments, a program code of software for realizing the functions of the above-described embodiments is transmitted to an apparatus or a computer in a system connected to the various devices. The present invention also includes those which are supplied and executed by operating the various devices according to a program stored in a computer (CPU or MPU) of the system or the apparatus.
[0066]
In this case, the program code itself of the software realizes the function of the above-described embodiment, and the program code itself and a unit for supplying the program code to the computer, for example, storing the program code The recorded recording medium constitutes the present invention. As a recording medium for storing such a program code, for example, a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a magnetic tape, a nonvolatile memory card, a ROM, and the like can be used.
[0067]
When the computer executes the supplied program code, not only the functions of the above-described embodiments are realized, but also the OS (operating system) or other application software running on the computer. It goes without saying that such a program code is also included in the embodiment of the present invention when the functions of the above-described embodiment are realized in cooperation with the above.
[0068]
Further, after the supplied program code is stored in a memory provided in a function expansion board of a computer or a function expansion unit connected to the computer, a CPU provided in the function expansion board or the function expansion unit based on an instruction of the program code. It is needless to say that the present invention also includes a case in which the functions of the above-described embodiments are implemented by performing part or all of the actual processing.
[0069]
【The invention's effect】
As described above, according to the present invention, the subject's heart pulsation, the subject's movement and the subject's heart pulsation obtained by image processing analysis of a fluoroscopic image or by ecological movement due to respiration, By having a means to change the frame rate in the storage of said continuously acquired fluoroscopic images by ecological movements due to respiration, without controlling the X-ray irradiation, which complicates the system, more frames can be obtained at the time of diagnosis. A moving image with a high rate and smooth motion is given, and the effect of easily diagnosing and reducing the storage capacity at the time of storage and reproduction can be obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram of an X-ray imaging apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram of an electrocardiographic waveform, an aortic pressure, a left ventricular pressure, and a timing preserving frame rate of X-ray irradiation.
FIG. 3 is a flowchart illustrating processing of the apparatus according to the first embodiment of this invention.
FIG. 4 is a flowchart illustrating another process of the apparatus according to the first embodiment of this invention.
FIG. 5 is a diagram showing a heart part extracted image.
FIG. 6 is a flowchart illustrating processing of the apparatus according to the second embodiment of the present invention.
FIG. 7 is a diagram showing a comparison table of a preservation rate associated with a heart area change rate.
FIG. 8 is a diagram showing a region where heart extraction image processing is performed.
FIG. 9 is a block diagram of an X-ray imaging apparatus showing a conventional technique.
FIG. 10 is a diagram showing a conventional technique and showing a waveform of X-ray irradiation.
[Explanation of symbols]
Reference Signs List 1 flat panel detection unit 10 electrocardiograph 11 electrocardiogram waveform capturing unit 12 image processing unit 13 system control unit 14 control unit of X-ray imaging system 108 operation / input / display unit 501 of X-ray imaging system 501 subject 502 X-ray tube 503 Image intensifier 505 Image processing device 506 Image memory 507 Display device 508 Bed 509 Injector 510 A / D converter 511 D / A converter 512 X-ray control unit

Claims (16)

In an X-ray imaging apparatus that irradiates a subject with X-rays and continuously acquires a fluoroscopic image of the subject,
An X-ray imaging apparatus comprising means for arbitrarily changing and storing a frame rate at the time of acquiring the fluoroscopic image. In an X-ray imaging apparatus that irradiates a subject with X-rays and continuously acquires a fluoroscopic image of the subject,
An X-ray imaging apparatus, comprising: means for changing a frame rate in storage of the continuously acquired fluoroscopic images according to an ecological movement due to the heartbeat and respiration of the subject. In an X-ray imaging apparatus that irradiates a subject with X-rays and continuously acquires a fluoroscopic image of the subject,
The frame rate in the storage of the continuously acquired fluoroscopic images is changed according to the motion of the subject obtained by performing image processing analysis on the obtained fluoroscopic images and the pulsation of the subject's heart and the ecological motion due to respiration. An X-ray imaging apparatus comprising: A first storage unit for holding the continuously acquired fluoroscopic images and a second storage unit for storing for later reference;
The first storage unit stores the continuously acquired fluoroscopic images at the frame rate at the time of acquisition, and the second storage unit stores the subject's heart beat, Alternatively, there is provided a means for changing and storing a frame rate in accordance with a subject's movement obtained by performing image processing analysis of the obtained fluoroscopic image and an ecological movement due to the subject's heartbeat, respiration, etc. The X-ray imaging apparatus according to claim 1, wherein: The X-ray imaging apparatus according to claim 4, wherein the first storage means is a memory having a high access speed, and the second storage means is a large-capacity nonvolatile memory. Means for changing the frame rate in the storage of the continuously obtained fluoroscopic images, according to the heartbeat of the subject, the ecological movement due to breathing,
2. The apparatus according to claim 1, further comprising means for detecting an ecological movement of the subject due to pulsation and respiration of the heart, and means for changing a frame rate in storing a fluoroscopic image obtained based on the movement information. The X-ray imaging apparatus according to any one of claims 1 to 5. Means for detecting the heartbeat of the subject,
Using an electrocardiograph for detecting an action potential generated in response to the pulsation of the heart, and changing and storing the frame rate in synchronization with an electrocardiogram obtained using the electrocardiograph. Item 7. An X-ray imaging apparatus according to Item 6. In an X-ray imaging apparatus that irradiates a subject with X-rays and continuously acquires a fluoroscopic image of the subject,
Has a means for detecting the biological movement of the subject's heart beat, respiration, etc.,
An X-ray imaging apparatus having means for storing information of the detected ecological movement in association with the continuously acquired perspective images. In an X-ray imaging method of irradiating a subject with X-rays and continuously obtaining a fluoroscopic image of the subject,
An X-ray imaging method comprising a step of arbitrarily changing and storing a frame rate at the time of acquiring the fluoroscopic image. In an X-ray imaging method of irradiating a subject with X-rays and continuously obtaining a fluoroscopic image of the subject,
An X-ray imaging method, comprising a step of changing a frame rate in storage of the continuously acquired fluoroscopic images according to an ecological movement caused by a heartbeat and respiration of the subject. In an X-ray imaging method of irradiating a subject with X-rays and continuously obtaining a fluoroscopic image of the subject,
The frame rate in the storage of the continuously acquired fluoroscopic images is changed according to the motion of the subject obtained by performing image processing analysis on the obtained fluoroscopic images and the pulsation of the subject's heart and the ecological motion due to respiration. An X-ray imaging method, comprising the step of: In an X-ray imaging method of irradiating a subject with X-rays and continuously obtaining a fluoroscopic image of the subject,
Pulsation of the subject's heart, having a step of detecting an ecological movement due to respiration,
An X-ray imaging method, comprising a step of storing information of the detected ecological movement in association with the continuously acquired perspective images. When irradiating the subject with X-rays and continuously obtaining fluoroscopic images of the subject,
A computer-readable storage medium storing a code for arbitrarily changing a frame rate when the fluoroscopic image is acquired and storing the frame rate. When irradiating the subject with X-rays and continuously obtaining fluoroscopic images of the subject,
A computer-readable storage medium storing a code for changing a frame rate in storing the continuously acquired fluoroscopic images according to an ecological movement due to the heartbeat and respiration of the subject. When irradiating the subject with X-rays and continuously obtaining fluoroscopic images of the subject,
The frame rate in the storage of the continuously acquired fluoroscopic images is changed according to the motion of the subject obtained by performing image processing analysis on the obtained fluoroscopic images and the pulsation of the subject's heart and the ecological motion due to respiration. A computer-readable storage medium having stored therein a code to be executed. When irradiating the subject with X-rays and continuously obtaining fluoroscopic images of the subject,
A code for detecting an ecological movement due to the heartbeat, respiration, etc. of the subject,
A computer-readable storage medium storing a code for storing information on the detected ecological movement in association with the continuously acquired perspective images.

Images