JP2014012216A - X-ray image diagnostic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an X-ray image diagnostic apparatus capable of automatically retrieving reference image data collected at an imaging position substantially equal to an imaging position of transparent image data out of a plurality of reference image data pre-collected at different imaging positions as load map data.SOLUTION: An imaging system and a top board are moved in a state that a contrast medium is injected into a diagnosis and treatment portion of a body to be inspected, a plurality of reference image data is collected from a plurality of imaging directions, positional information of the imaging system and the top board is imparted to the plurality of reference image data obtained and the reference image data imparted therewith are stored in a reference image data storage section 11. Subsequently, when movement and a stop of the imaging system and the top board are performed and transparent image data in a desired imaging direction are collected, a position detection section 103 detects the positional information and movement and stop information of the imaging system and the top board, and a load map data retrieval section 13 extracts reference image data having positional information substantially equal to the positional information of the imaging system and the top board that are moved and stopped as load map data from the plurality of reference image data.

Description

The present invention relates to an X-ray image diagnostic apparatus, and in particular, an X-ray capable of displaying reference image data at a desired imaging position retrieved from a plurality of reference image data collected in advance as road map data. The present invention relates to an image diagnostic apparatus.

Medical image diagnosis using an X-ray image diagnostic apparatus, an MRI apparatus, or an X-ray CT apparatus has made rapid progress with the development of computer technology and has become indispensable in today's medical care.

In recent years, X-ray diagnostic imaging has progressed mainly in the field of circulatory organs with the development of catheter procedures. X-ray image diagnosis in the circulatory region is intended for diagnosis of the entire arteries and veins including the cardiovascular system. Usually, fluoroscopic image data is collected in a state where a contrast medium is injected into the blood vessel.

An X-ray image diagnostic apparatus for cardiovascular diagnosis generally includes an X-ray generation unit and an X-ray detection unit (hereinafter collectively referred to as an imaging system), a holding unit that holds the imaging system, and a patient (hereinafter referred to as an imaging system). A couch having a top plate on which a subject is called). Then, by moving the C-arm provided on the holding unit, the above-described top plate, and the like, X-ray imaging from the optimal imaging direction is possible for the diagnosis / treatment site of the subject.

In an X-ray diagnostic imaging apparatus for diagnosing cardiovascular disease, for example, when performing diagnosis and treatment by advancing a catheter to a target site in a blood vessel under observation of fluoroscopic image data, it is loaded to perform catheter operation safely and easily. Map perspective is used. In the roadmap perspective,
First image data (road map data) is collected from a predetermined imaging direction in a state in which a contrast medium is injected into the diagnosis / treatment site of the subject, and is collected in real time in the imaging direction during diagnosis / treatment. Two image data (perspective image data) and road map data collected in advance have been displayed in a superimposed manner or in parallel.

In this case, a method of collecting contrast image data obtained by imaging with a contrast agent injected into a blood vessel as road map data as it is, or mask image data obtained by imaging before injecting a contrast agent and There is a method of collecting DSA (Digital Subtraction Angiography) image data in which only a blood vessel image is extracted by difference processing (subtraction processing) with the contrast image data as road map data.

In the road map method described above, as described above, the shooting direction of the road map data and the shooting direction of the fluoroscopic image data need to be substantially the same. If these shooting directions are significantly different, the shooting of the fluoroscopic image data is required. Roadmap data in approximately the same direction had to be collected again. The re-collection of roadmap data not only increased the degree of invasiveness due to contrast medium re-administration and X-ray re-exposure, but also caused a significant decrease in diagnosis and treatment efficiency.

In order to solve such problems, first, reference image data is collected from a plurality of imaging directions in a state in which a contrast medium is injected into the diagnosis / treatment site of the subject, and the desired imaging direction is obtained during diagnosis / treatment. The reference image data (that is, the road map data) in the photographing direction substantially equal to the desired photographing direction extracted from the perspective image data collected in real time and the plurality of reference image data collected in advance. A method of displaying in parallel has been proposed (see, for example, Patent Document 1).

JP 2005-87633 A

In the conventional road map method as described in the above-mentioned Patent Document 1, the timing for searching for road map data suitable for fluoroscopic image data from a plurality of reference image data collected in advance is determined by the operator using an input unit. An operation for inputting the search instruction signal is performed based on a diagnosis / treatment (IVR: Interven) performed under observation of fluoroscopic image data.
tional Radiology) is a factor that significantly reduces the efficiency.

The present invention has been made in view of such problems, and its object is to search a perspective image when searching for road map data suitable for the road map method from a plurality of reference image data collected in advance. An object of the present invention is to provide an X-ray diagnostic imaging apparatus capable of automatically searching for the road map data based on position information and movement stop information of an imaging system and a top plate at the time of data collection.

In order to solve the above-described problem, an X-ray diagnostic imaging apparatus according to the first aspect of the present invention provides a plurality of reference image data collected in advance in X-ray imaging in a reference imaging mode at a plurality of imaging positions of a subject. In the X-ray diagnostic imaging apparatus, the reference image data at an imaging position close to the imaging position of the fluoroscopic image data collected by X-ray imaging in the fluoroscopic imaging mode is extracted as roadmap data and displayed together with the fluoroscopic image data. In the imaging mode and the fluoroscopic imaging mode, the position information of the imaging system including the X-ray generation unit that irradiates the subject with X-rays and the X-ray detection unit that detects the X-rays transmitted through the subject, and the subject Position detection means for detecting position information of the top plate on which the specimen is placed, and the position information is added to the plurality of reference image data collected in the reference imaging mode and stored. Reference image data storage means, and movement determination means for determining movement stop states of the imaging system and the top plate based on the position information detected by the position detection means when collecting the fluoroscopic image data in the fluoroscopic imaging mode. The reference image data having position information close to the position information of the imaging system and the top plate at the time of collecting the fluoroscopic image data detected by the position detecting means based on the determination result of the movement determining means is used as road map data. A road map data search means for extracting, and a display means for displaying the road map data and the fluoroscopic image data are provided.

According to a second aspect of the present invention, there is provided an X-ray diagnostic imaging apparatus according to a second aspect of the present invention. In the X-ray diagnostic imaging apparatus that extracts reference image data at an imaging position close to the imaging position of fluoroscopic image data collected by X-ray imaging as road map data and displays the extracted data together with the fluoroscopic image data, the reference imaging mode and the fluoroscopic imaging In mode, X for the subject
Position detection means for detecting position information of an imaging system having an X-ray generation unit for irradiating a line and an X-ray detection unit for detecting an X-ray transmitted through the subject; and the plurality of pieces collected in the reference imaging mode Reference image data storage means for adding and storing the position information of the imaging system in the collection of the reference image data to the reference image data, and the position detection means detected in the collection of the fluoroscopic image data in the fluoroscopic imaging mode The movement determination unit that determines the movement stop state of the imaging system based on the position information of the imaging system, and the fluoroscopic image data detected by the position detection unit based on the determination result of the movement determination unit when the fluoroscopic image data is collected Road map data search means for extracting, as road map data, reference image data having position information close to the position information of the imaging system; Is characterized by comprising display means for displaying the map data and the fluoroscopic image data.

According to the present invention, when searching for road map data suitable for the road map method from a plurality of reference image data collected in advance, the position information and movement stop information of the imaging system and the top plate at the time of collecting fluoroscopic image data The road map data can be automatically searched based on the above. For this reason, it is possible not only to improve the diagnosis / treatment efficiency but also to reduce the burden on the operator.

1 is a block diagram showing the overall configuration of an X-ray image diagnostic apparatus according to an embodiment of the present invention. The block diagram which shows the specific structure of the X-ray imaging part with which the X-ray image diagnostic apparatus of the Example is provided. The figure for demonstrating the specific structure and function of the holding | maintenance part and bed part in the Example. The figure which shows the specific example of the various movement mechanism part provided in the holding | maintenance part and bed part of the Example, and the movement mechanism drive part which supplies a drive signal with respect to these movement mechanism parts. 6 is a flowchart showing a procedure for collecting reference image data in the embodiment. The flowchart which shows the search procedure of the road map data in the Example.

  Embodiments of the present invention will be described below with reference to the drawings.

In the embodiments of the present invention described below, first, reference image data is collected from a plurality of imaging directions by moving the imaging system and the top plate in a state where a contrast agent is injected into the diagnosis / treatment site of the subject. The position information of the imaging system / top is added to the plurality of reference image data and stored. Next, when collecting fluoroscopic image data in a desired shooting direction by repeatedly moving and stopping the imaging system / top, the position information and the movement stop information of the imaging system / top are detected, and the position information at the movement stop position Reference image data having substantially the same position information as supplementary information is extracted from the plurality of reference image data. Then, the extracted reference image data is displayed on the display unit together with the perspective image data as road map data.

In the present embodiment, the case where the contrast image data obtained by X-ray imaging with the contrast medium injected into the blood vessel is collected as reference image data as it is will be described. However, it is obtained by X-ray imaging before contrast medium injection. DSA image data obtained by extracting only blood vessel images obtained by subtraction processing between the mask image data to be obtained and the contrast image data may be collected as reference image data.

(Device configuration)
The configuration of the X-ray image diagnostic apparatus according to the embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing an overall configuration of the X-ray image diagnostic apparatus, and FIG. 2 is a block diagram showing a specific configuration of an X-ray imaging unit included in the X-ray image diagnostic apparatus.

An X-ray diagnostic imaging apparatus 100 shown in FIG. 1 has an imaging mode for the purpose of collecting reference image data (hereinafter referred to as a reference imaging mode) and an imaging mode for the purpose of collecting fluoroscopic image data (hereinafter, referred to as a reference imaging mode). X-ray imaging unit 1 for generating projection data by irradiating X-rays to the diagnosis / treatment site of subject 150 in X-ray imaging mode) and detecting X-rays transmitted through the diagnosis / treatment site; An image data generation unit 6 that generates reference image data and fluoroscopic image data based on the projection data, and an X-ray generation unit 2 and an X-ray detection unit 3 (imaging system) described later provided in the X-ray imaging unit 1 are provided. A holding unit 8 that holds and moves the subject 150 around the subject 150 in a predetermined direction, a bed unit 9 that moves a not-shown top plate on which the subject 150 is placed in a predetermined direction, and the holding unit 8 and the bed unit 9 are provided. Various transfers described later Supplying a drive signal to the mechanism further comprises a moving mechanism driving unit 10 for detecting the position information of the imaging system / the top plate on the basis of this drive signal.

In addition, the X-ray diagnostic imaging apparatus 100 adds the reference image data generated by the above-described image data generation unit 6 to the imaging system / top plate position information in the reference imaging mode detected by the moving mechanism driving unit 10 and saves it. A reference image data storage unit 11, a movement determination unit 12 that determines the movement stop state of the imaging system / top plate based on the position information of the imaging system / top plate in the fluoroscopic mode detected by the movement mechanism driving unit 10, and The road map data suitable for the fluoroscopic image data based on the determination result of the movement stop state supplied from the movement determination unit 12 and the position information of the imaging system / top in the fluoroscopic imaging mode supplied from the movement mechanism driving unit 10 Is extracted from a plurality of reference image data stored in the reference image data storage unit 11, and the image is further displayed in the fluoroscopic mode. A display unit 14 for series fluoroscopic image data and the road map data search unit 13 when over data generating unit 6 has generated to display the road map data retrieved,
An input unit 15 for inputting subject information, setting X-ray imaging conditions including X-ray irradiation conditions, inputting a movement instruction signal for instructing movement of the imaging system and the top board, and inputting various command signals; ,
A system control unit 16 that controls the above-described units in an integrated manner is provided.

As shown in FIG. 1, the X-ray imaging unit 1 includes an X-ray generation unit 2, an X-ray detection unit 3, and a projection data generation unit 4.
And a high voltage generator 5, and has a function of generating projection data based on the X-ray dose transmitted through the diagnosis / treatment site of the subject 150 in the reference imaging mode and the fluoroscopic imaging mode.

FIG. 2 shows a specific configuration of each unit described above included in the X-ray imaging unit 1.
The X-ray generation unit 2 includes an X-ray tube 21 that irradiates the examination site with X-rays, and an X-ray restrictor 22 that forms an X-ray weight (cone beam) for the X-rays emitted from the X-ray tube 21. It has. The X-ray tube 21 is a vacuum tube that generates X-rays, and accelerates electrons emitted from a cathode (filament) by a high voltage to collide with a tungsten anode to generate X-rays. The X-ray diaphragm 22 is located between the X-ray tube 21 and the subject 150 and has a function of narrowing the X-ray beam irradiated from the X-ray tube 21 to a predetermined irradiation field size.

The X-ray detector 3 includes I.I. I. (Image intensifier) and X-ray TV method and flat detector method. Furthermore, there are two types of flat detectors: one that converts X-rays directly into electric charge, and one that converts light into light after being converted into light. There is something to convert. Here, the X-ray detector 3 provided with a flat panel detector for directly converting X-rays into electric charges will be described, but the present invention is not limited to this.
That is, the X-ray detection unit 3 in the present embodiment converts the X-ray transmitted through the subject 150 into electric charges and accumulates them, and a drive for reading out the electric charges accumulated in the flat detectors 31. A gate driver 32 for generating a pulse is provided.

The flat panel detector 31 is configured by two-dimensionally arranging minute detection elements. Each detection element senses X-rays and generates a charge in accordance with an incident X-ray dose. A charge storage capacitor for storing the generated charge and a TFT (thin film transistor) (not shown) for reading out the charge stored in the charge storage capacitor at a predetermined timing are provided. And
The accumulated charges are sequentially read out by the drive pulse supplied by the gate driver 32.

Next, the projection data generation unit 4 includes a charge / voltage converter 41 that converts the charges read from the flat detector 31 in parallel in units of rows or columns into a voltage, and the charge / voltage converter 41.
A / D converter 42 for converting the output of the digital signal into a digital signal, and a parallel / serial converter 43 for converting the digitally converted parallel signal into a time-series serial signal (projection data).

On the other hand, the high voltage generator 5 includes a high voltage generator 52 that generates a high voltage to be applied between the anode and the cathode in order to accelerate the thermoelectrons generated from the cathode of the X-ray tube 21, and the system controller 16. Is provided with an X-ray control unit 51 that controls X-ray irradiation conditions such as tube current, tube voltage, irradiation time, and irradiation timing in the high-voltage generator 52 in accordance with the instruction signal supplied from.

Returning to FIG. 1, the image data generation unit 6 includes a projection data storage unit and a calculation processing unit (not shown), and the projection data storage unit is supplied from the projection data generation unit 4 in the reference imaging mode and the fluoroscopic imaging mode. Projection data are sequentially stored to generate two-dimensional projection data. On the other hand, the arithmetic processing unit performs image processing such as filtering processing on the two-dimensional projection data generated in the projection data storage unit to generate reference image data and fluoroscopic image data.
A plurality of reference image data generated by X-ray imaging in the reference imaging mode performed while repeatedly moving and stopping the imaging system and the top plate is received from a position detection unit 103 described later included in the moving mechanism driving unit 10. The supplied image / top position information and the like are stored in the reference image data storage unit 11 as supplementary information.

Next, specific configurations and functions of the holding unit 8 and the bed unit 9 will be described with reference to FIG. FIG.
The C-arm 81 having the X-ray generation unit 2 and the X-ray detection unit 3 (imaging system) attached to the ends thereof.
And a bed portion 9 having a top plate 91 on which a holding portion 8 and a subject 150 are placed.
In this figure, in order to facilitate the following description, the body axis direction (longitudinal direction of the top 91) of the subject 150 is the y direction, and the direction perpendicular to the floor surface 160 on which the holding unit 8 and the bed unit 9 are installed. Z direction, y
The direction perpendicular to the direction and the z direction (the transverse direction of the top 91) is the x direction.

The holding unit 8 includes a C arm 81, an arm holder 82, an arm column 83, and a floor turning arm 8
4, and one end of the floor turning arm 84 is attached so as to be rotatable in the direction of the arrow d about the floor rotation axis z <b> 1 perpendicular to the floor surface 160. On the other hand, an arm column 83 having an arm column rotation axis z2 parallel to the z direction is attached to the other end of the floor turning arm 84 so as to be rotatable in the direction of the arrow c.

Further, an arm holder 82 is attached to the side surface of the arm column 83 so as to be rotatable in the direction of arrow b about the arm main rotation axis z3 parallel to the y direction.
The C-arm 8 is mounted on the side surface of 2 with the X-ray generation unit 2 and the X-ray detection unit 3 facing each other at the end thereof.
1 is attached so as to be slidable in the direction of arrow a about the arm slide center axis z4.

Further, the X-ray detector 3 of the imaging system attached to the end of the C-arm 81 can be moved in the direction of the arrow e. Further, the X-ray detector 3 is an X-ray generator. 2 is attached so as to be rotatable in the direction of the arrow f about the imaging system rotation axis z5 in conjunction with the X-ray diaphragm 22 (see FIG. 2) provided in FIG.

Each of the above-described units constituting the holding unit 8 includes a slide mechanism unit that slides the C arm 81 in the direction a about the arm slide center axis z4, and an arm main rotation axis z3.
Centering on the holder rotation mechanism for rotating the arm holder 82 in the b direction about the center, the column rotation mechanism for rotating the arm column 83 in the c direction about the arm column rotation axis z2, and the floor rotation axis z1. A floor turning arm turning mechanism (not shown) for turning the floor turning arm 84 in the d direction is provided, and an imaging system moving mechanism for moving the X-ray detection unit 3 in the e direction and an imaging system rotation. An imaging system rotation mechanism (not shown) that rotates the X-ray detection unit 3 in the f direction about the axis z5 is provided.

On the other hand, the bed unit 9 moves the top 91 on which the subject 150 is placed vertically in the h direction (z direction) and the top 91 with the longitudinal direction ga (y direction) or the lateral direction gb ( x
A horizontal direction moving mechanism (not shown) that slides in the direction).

Then, by rotating or moving the above-described units provided in the holding unit 8 and the bed unit 9 in a predetermined direction, the imaging system attached to the end of the C arm 81 is placed on the top plate 91. The position or direction suitable for the X-ray imaging of the subject 150 can be set.

Returning to FIG. 1 again, the movement mechanism driving unit 10 sends drive signals to the above-described various movement mechanism units provided in the holding unit 8 and the bed unit 9 in order to move the imaging system to a desired position of the subject 150. A mechanism driving unit 101 to be supplied, a mechanism driving control unit 102 that controls the mechanism driving unit 101, and a position detection unit 103 that detects position information of the imaging system / top plate based on a driving signal generated by the mechanism driving unit 101. I have.

FIG. 4 shows specific examples of various moving mechanism units provided in the holding unit 8 and the bed unit 9 and a moving mechanism driving unit 10 that supplies a driving signal to these moving mechanism units. 3 includes a slide mechanism 801 that slides the C arm 81 in the direction a in the joint between the C arm 81 and the arm holder 82 of the holding unit 8, and the arm holder 82 and the arm column 83.
Is provided with a holder rotation mechanism 802 for rotating the arm holder 82 in the b direction, and the arm column 83 is rotated in the c direction at the junction between the arm column 83 and the floor turning arm 84. The column turning mechanism 803 is provided, and the floor turning arm turning mechanism 804 for turning the floor turning arm 84 in the d direction is provided at the joint between the floor turning arm 84 and the floor surface 160, respectively. Furthermore, an imaging system moving mechanism unit 805 that moves the X-ray detection unit 3 in the e direction and a rotation of the X-ray detection unit 3 in the f direction at the joint between the end of the C arm 81 and the X-ray detection unit 3 An imaging system rotation mechanism 806 is provided.

On the other hand, in the bed part 9, the vertical movement mechanism part 901 for moving the top 91 on which the subject 150 is placed up and down in the h direction and the top 91 in the longitudinal direction (ga direction) and the lateral direction (gb direction). A horizontal movement mechanism unit 902 for sliding is provided.

Then, the slide mechanism 801, the holder turning mechanism 802, the support turning mechanism 803, the floor turning arm turning mechanism 804, the imaging system moving mechanism 805, the imaging system turning mechanism 806, and the bed of the holding unit 8 The drive signal generated by the mechanism drive unit 101 based on the control signal supplied from the mechanism drive control unit 102 of the movement mechanism drive unit 10 is supplied to the vertical direction movement mechanism unit 901 and the horizontal direction movement mechanism unit 902 of the unit 9. Is done.

That is, the subject 150 mounted on the top 91 has an imaging system attached to the end of the C-arm 81 by controlling the above-described various moving mechanism units based on control signals generated by the mechanism drive control unit 102. The relative position of the imaging system with respect to the diagnosis / treatment site of the subject 150 is the slide movement distance of the C arm 81 relative to the arm holder 82, and the b direction of the arm holder 82. , The rotation angle of the floor turning arm 84 with respect to the d direction and the rotation angle of the arm column 83 with respect to the c direction, the rotation angle of the X-ray detector 3 with respect to the C arm 81, and the x of the top 91 It is uniquely determined by the movement distance in the direction, the y direction, and the z direction.

On the other hand, the position detection unit 103 of the moving mechanism drive unit 10 shown in FIG. 1 obtains the position information of the imaging system attached to the C arm 81 and the position information of the top plate based on the drive signal generated by the mechanism drive unit 101. To detect. Then, the position information of the imaging system / top plate obtained in the reference photographing mode is supplied to the reference image data storage unit 11, and the position information of the imaging system / top plate obtained in the fluoroscopic photographing mode is a road map. The data is supplied to the data search unit 13.

Next, the reference image data storage unit 11 is an imaging system / top plate that is supplied from the position detection unit 103 of the moving mechanism driving unit 10 to the time-series reference image data generated by the image data generation unit 6 in the reference photographing mode. Position information, the collection time of the reference image data supplied from the system control unit 16 and the elapsed time since the administration of the contrast medium, and the FOV (Fi
eld of View) information and so on.

The movement determination unit 12 receives the position information of the imaging system / top plate supplied from the position detection unit 103 of the movement mechanism driving unit 10 in the fluoroscopic imaging mode, and based on the temporal change of this position information, The movement stop state of the plate is determined. For example, when the position information does not change in a predetermined period, it is determined that the imaging system and the top board are set to desired imaging positions, and the determination result is supplied to the system control unit 16.

On the other hand, the road map data search unit 13 receives the above-described determination result (that is, the determination result that the imaging system and the top board are set at a desired shooting position) from the movement determination unit 12 via the system control unit 16. Then, at this time, the position information of the imaging system / top plate at the time of collecting the fluoroscopic image data supplied from the position detecting unit 103 of the moving mechanism driving unit 10 is received, and a plurality of images stored in the reference image data storage unit 11 are received. Reference image data having position information closest to the position information as supplementary information is extracted as road map data. The obtained road map data is supplied to the display unit 14.

The road map data search unit 13 includes a pixel value measurement unit (not shown). When a plurality of reference image data is extracted in the above-described road map data search, the pixel value measurement unit 13 extracts the reference image. The pixel value in each of the data is measured, and the reference image data that exhibits the largest average pixel value or the highest pixel value (that is, reference image data having the largest amount of contrast medium injected) is extracted as road map data.

Similarly, when a plurality of reference image data is extracted in the search for road map data, the road map data search unit 13 collects the reference image data added to these reference image data, contrast agent administration, and the like. The road map data may be extracted on the basis of the elapsed time from FOV or FOV information. For example, the latest reference image data based on the collection time of the reference image data, the reference image data collected after a predetermined time has passed since the contrast agent administration, or the reference image data having an FOV substantially equal to the FOV of the fluoroscopic image data. Extracted as roadmap data. Note that the road map data extraction method to be actually applied is selected in advance by the operator.

Next, the display unit 14 includes a display data generation unit, a data conversion unit, and a monitor (not shown). The display data generation unit generates display data by superimposing the perspective image data supplied from the image data generation unit 6 on the road map data supplied from the road map data search unit 13, and the data conversion unit The display data is subjected to D / A conversion, display format conversion, etc. and displayed on the monitor. However, the display unit 14 may display the road map data supplied from the road map data search unit 13 and the fluoroscopic image data supplied from the image data generation unit 6 in parallel on the same monitor. You may display each on two monitors arrange | positioned closely.

The input unit 15 is an interactive interface having input devices such as a display panel, a keyboard, a trackball, a joystick, and a mouse on the console, and input of subject information and setting of X-ray imaging conditions including X-ray irradiation conditions. Selection of auto map function that enables automatic search of road map data, input of movement instruction signal for instructing movement of imaging system and top plate, selection of reference photographing mode and fluoroscopic photographing mode, multiple at the same photographing position When the reference image data is extracted, the road map data extraction method is selected, the FOV is updated, and various command signals are input.

The system control unit 16 includes a CPU and a storage circuit (not shown), and the above-described various information input / set / selected by the input unit 15 is stored in the storage circuit. Then, the CPU comprehensively controls each unit of the X-ray diagnostic apparatus 100 based on these various types of information, generates and stores reference image data in the reference imaging mode, and fluoroscopic image data at a desired imaging position in the fluoroscopic imaging mode. And further, automatic search of reference image data (road map data) collected at the photographing position closest to the desired photographing position of the fluoroscopic image data is performed. In addition, the system control unit 16 has a timer that measures the collection time of reference image data and the elapsed time from contrast medium administration.

Next, a reference image data collection procedure and a road map data search procedure by the X-ray image diagnostic apparatus 100 according to the present embodiment will be described with reference to the flowcharts of FIGS. In the following, a case where a catheter is inserted along the blood vessel of the subject 150 to diagnose and treat the coronary artery is described, but the diagnosis / treatment site is not limited to the coronary artery.

(Reference image data collection procedure)
When collecting reference image data for the subject 150, the operator of the X-ray diagnostic imaging apparatus 100 first inputs subject information in the input unit 15, and sets X-ray imaging conditions in the reference imaging mode and fluoroscopic imaging mode. Selection of auto map function that enables automatic search of road map data, selection of reference photographing mode, and the like are performed. Next, the subject 150 is placed on the top 91 of the bed unit 9 and the imaging system having the X-ray generation unit 2 and the X-ray detection unit 3 and the top are rotated / moved to move the diagnosis / treatment site. An imaging position suitable for X-ray imaging is set (step S1 in FIG. 5).

When the above initial setting is completed, the operator inputs a shooting start command for the reference shooting mode at the input unit 15 (step S2 in FIG. 5), and this command signal is sent to the system control unit 1.
6 starts to generate and display image data (step S3 in FIG. 5).
.

That is, the system control unit 16 that has received the command signal supplies an instruction signal for executing X-ray imaging in the reference imaging mode to the X-ray control unit 51 of the high voltage generation unit 5. The X-ray control unit 51 that has received this instruction signal controls the high-voltage generator 52 based on the X-ray irradiation conditions of the X-ray imaging conditions initially set in step S1 described above to control the X-ray generation unit 2 X. A high voltage is applied to the X-ray tube 21, and the X-ray tube 21 irradiates the subject 150 with pulsed X-rays via the X-ray restrictor 22. And the X-ray which permeate | transmitted the test object 150 is detected by the plane detector 31 of the X-ray detection part 3 provided in the back.

Detection elements (not shown) of the planar detector 31 arranged two-dimensionally in the line direction and the column direction are
X-rays transmitted through the treatment site are detected, and signal charges proportional to the X-ray transmission amount are accumulated in the charge storage capacitor of the detection element. When the first X-ray irradiation to the examination site is completed, the gate driver 32 of the X-ray detector 3 supplies a driving pulse to the flat detector 31 to sequentially read out the signal charges accumulated in the charge storage capacitor.

The read signal charge is converted into a voltage by the charge / voltage converter 41 of the projection data generation unit 4, further converted into a digital signal by the A / D converter 42, and then 1 by the parallel / serial converter 43. Once stored as projection data for a line. The stored projection data is read serially in line units, and sequentially stored in the projection data storage unit of the image data generation unit 6 to generate two-dimensional projection data. Next, the arithmetic processing unit of the image data generation unit 6 performs image processing such as filtering processing on the two-dimensional projection data generated in the projection data storage unit to generate image data, which is displayed on the monitor of the display unit 14. indicate.

Next, the operator observes the image data displayed on the monitor of the display unit 14 and observes the subject 1.
A catheter for injecting a contrast medium is inserted into the blood vessel from 50 ridges (the base of the foot) and moved until the distal end reaches the vicinity of the start of the coronary artery (step S4 in FIG. 5). When the distal end of the catheter inserted into the blood vessel reaches a predetermined site, the operator initially sets in step S1 by inputting an imaging system / top plate movement instruction signal at the input unit 15. The positions of the imaging system and the top plate are moved to an imaging position suitable for X-ray imaging of the diagnosis / treatment site where the distal end of the catheter is inserted (step S5 in FIG. 5).

When the setting of the imaging system and the top plate for the imaging position is completed, a contrast medium is injected into the diagnosis / treatment site via the catheter (step S6 in FIG. 5), and a predetermined time is set based on the injection start time of the contrast medium. The image data generated in time series in the period is sequentially stored in the reference image data storage unit 11 as the reference image data at the photographing position (step S7 in FIG. 5). still,
The storage of the reference image data may be automatically performed based on the imaging system / top plate movement stop information supplied from the movement determination unit 12 or the contrast medium injection start information supplied from the system control unit 16, You may perform based on the preservation | save instruction | indication signal which an operator inputs with the input part 15. FIG.

On the other hand, the position detection unit 103 of the moving mechanism drive unit 10 detects the position information of the imaging system / top at the above-described imaging position based on the drive signal generated by the mechanism drive unit 101 (step S8 in FIG. 5). The obtained detection result is added to the reference image data stored in the reference image data storage unit 11 (step S9 in FIG. 5). At this time, the collection time of the reference image data supplied from the system control unit 16, the elapsed time since administration of the contrast medium, and the input unit 15
The FOV information updated by the above is also added to each of the image data.

When the above-described generation and storage of time-series reference image data at the photographing position and addition of imaging system / top position information and the like to these reference image data are completed, a movement instruction input by the operator from the input unit 15 By repeating the above steps S5 to S9 according to the signal, time-series reference image data is generated and stored at a plurality of shooting positions adjacent to the shooting position, and additional information is added to the reference image data. (Steps S5 to S9 in FIG. 5).

(Roadmap data search procedure)
When the generation and storage of the reference image data are completed by the procedure shown in steps S1 to S9 in FIG. 5, the operator of the X-ray image diagnostic apparatus 100 is provided with the X-ray generation unit 2 and the X-ray detection unit 3. The imaging plate and the top 91 on which the subject 150 is placed are moved to set an imaging position suitable for observation of the diagnosis / treatment site (step S11 in FIG. 6).

Next, the operator selects a fluoroscopic imaging mode using the input unit 15, and then inputs a radiography start command for the purpose of collecting fluoroscopic image data (step S12 in FIG. 6). Then, when this command signal is supplied to the system control unit 16, image data generation and display in the fluoroscopic imaging mode are started by the same procedure as in step S3 described above (step S13 in FIG. 6).

Next, the operator operates the subject 15 under the observation of the image data displayed on the monitor of the display unit 14.
A catheter for treatment is inserted from the 0 portion of the scale (step S14 in FIG. 6). When the distal end of the inserted catheter reaches the diagnosis / treatment site, the movement of the imaging system and the top board is moved in a desired direction by inputting a movement instruction signal at the input unit 15, and the distal end of the catheter When the imaging position suitable for X-ray imaging of the diagnosis / treatment site where the part is inserted is reached, the movement is stopped (step S15 in FIG. 6). At this time, the image data generated by the image data generation unit 6 based on the projection data collected at the photographing position is supplied to the display unit 14 as fluoroscopic image data (step S16 in FIG. 6).

At this time, the position detection unit 103 of the moving mechanism driving unit 10 obtains the position information of the imaging system / top plate based on the drive signal generated by the mechanism driving unit 101 to move the imaging system and the top plate to the photographing position. The detected position information is supplied to the movement determination unit 12 and the road map data search unit 13 (step S17 in FIG. 6).

The movement determination unit 12 detects temporal changes in the position information of the imaging system / top plate supplied in time series from the position detection unit 103 in accordance with the movement of the imaging system and the top plate. When the change in the position information is not recognized in the predetermined period, it is determined that the imaging system and the top board have reached the imaging position suitable for X-ray imaging, and the determination result is loaded via the system control unit 16. It supplies to the map data search part 13 (step S18 of FIG. 6).

On the other hand, if the road map data search unit 13 receives the above determination result from the movement determination unit 12 via the system control unit 16, the position detection unit 103 of the movement mechanism drive unit 10 at this time.
Receiving the position information of the imaging system / top plate at the time of collecting the fluoroscopic image data supplied from
Reference image data to which position information closest to the position information is added is extracted as road map data from a plurality of reference image data stored in the reference image data storage unit 11.
Then, the obtained road map data is supplied to the display unit 14 (step S19 in FIG. 6).
.

In the above-described road map data search, for example, when a plurality of reference image data such as image data collected in time series at the same shooting position is extracted, the road map data search unit 13 Suitable road map data is extracted based on the average pixel value or the maximum pixel value of these reference image data, or the collection time added to the reference image data, the elapsed time since contrast medium administration, FOV information, etc. .

Next, the display data generation unit of the display unit 14 generates display data based on the road map data supplied from the road map data search unit 13 and the fluoroscopic image data supplied from the image data generation unit 6, and monitors itself. (Step S20 in FIG. 6).

If it is necessary to observe the fluoroscopic image data at another imaging position following the observation of the fluoroscopic image data at the above-described imaging position, the imaging system and the top board are moved to desired positions, and then steps S15 to S15 are performed. The procedure described in S20 is executed (steps S15 to S20 in FIG. 6).

According to the embodiment of the present invention described above, when searching for road map data suitable for the road map method from a plurality of reference image data collected in advance, the imaging system and the top plate at the time of fluoroscopic image data collection are searched. The road map data can be automatically searched based on the position information and the movement stop information. For this reason, it is possible not only to improve the diagnosis / treatment efficiency but also to reduce the burden on the operator.

Further, when there are a plurality of reference image data extracted based on the position information of the imaging system and the top plate, the average pixel value or the maximum pixel value included in these reference image data, or added to the reference image data. Suitable road map data can be automatically searched based on the collected time, the elapsed time since contrast medium administration, FOV information, and the like. Therefore, it is possible to automatically search for road map data for a plurality of reference image data collected in time series at the same photographing position.

As mentioned above, although the Example of this invention has been described, this invention is not limited to the above-mentioned Example, It can change and implement. For example, in the above-described embodiment, the case where the contrast image data obtained by X-ray imaging in a state in which the contrast medium is injected into the blood vessel is directly collected as the reference image data has been described. DSA image data obtained by subtraction processing of mask image data obtained by photographing and the contrast image data may be collected as reference image data.

In addition, when there are a plurality of reference image data extracted based on the position information of the imaging system / top plate, the collection time of the reference image data added to these reference image data, the contrast agent administration The case where the suitable road map data is automatically searched based on the elapsed time or the FOV information has been described, but a plurality of reference image data extracted based on the position information is displayed in a list on the monitor of the display unit 14. The operator may select reference image data suitable as road map data from these reference image data. In this case, the input unit 1
The road map selection function for selecting and determining the reference image data is added to the input device 5.

On the other hand, although the position detection unit 103 in the above-described embodiment has described the case where the position information of the imaging system / top is detected based on the drive signal generated by the mechanism drive unit 101, the present invention is not limited to this. For example, the position information of the imaging system / top is detected based on the detection results of the position detectors provided in the various movement mechanisms of the holding unit 8 and the bed unit 9 or the control signal generated by the mechanism drive control unit 102. May be.

Further, in the above-described embodiment, the case where the road map data is searched based on the position information of the imaging system / top plate has been described. However, the road map data may be searched based on any one of the position information. Alternatively, the road map data may be searched based on position information of various moving mechanism units provided in the holding unit 8 and the bed unit 9.

DESCRIPTION OF SYMBOLS 1 ... X-ray imaging part 2 ... X-ray generation part 3 ... X-ray detection part 4 ... Projection data generation part 5 ... High voltage generation part 6 ... Image data generation part 8 ... Holding part 9 ... Bed part 10 ... Movement mechanism drive part DESCRIPTION OF SYMBOLS 101 ... Mechanism drive part 102 ... Mechanism drive control part 103 ... Position detection part 11 ... Reference image data storage part 12 ... Movement determination part 13 ... Road map data search part 14 ... Display part 15 ... Input part 16 ... System control part 100 ... X-ray diagnostic imaging equipment

Claims (10)

An imaging position close to the imaging position of the fluoroscopic image data collected by the X-ray imaging in the fluoroscopic imaging mode out of the plurality of reference image data previously collected by the X-ray imaging in the reference imaging mode at the plurality of imaging positions of the subject. In the X-ray diagnostic imaging apparatus that extracts the reference image data as road map data and displays it together with the fluoroscopic image data,
In the reference imaging mode and the fluoroscopic imaging mode, positional information of an imaging system having an X-ray generation unit that irradiates the subject with X-rays and an X-ray detection unit that detects X-rays transmitted through the subject; Position detecting means for detecting position information of the top plate on which the subject is placed;
Reference image data storage means for adding and storing the position information to the plurality of reference image data collected in the reference photographing mode;
A movement determination unit that determines a movement stop state of the imaging system and the top plate based on the position information detected by the position detection unit when collecting the fluoroscopic image data in the fluoroscopic imaging mode;
Based on the determination result of the movement determination means, reference image data having position information close to the position information of the imaging system and the top plate at the time of collecting the fluoroscopic image data detected by the position detection means is extracted as road map data. Roadmap data search means to
An X-ray diagnostic imaging apparatus comprising: display means for displaying the road map data and the fluoroscopic image data. An imaging position close to the imaging position of the fluoroscopic image data collected by the X-ray imaging in the fluoroscopic imaging mode out of the plurality of reference image data previously collected by the X-ray imaging in the reference imaging mode at the plurality of imaging positions of the subject. In the X-ray diagnostic imaging apparatus that extracts the reference image data as road map data and displays it together with the fluoroscopic image data,
In the reference imaging mode and the fluoroscopic imaging mode, positional information of an imaging system having an X-ray generation unit that irradiates the subject with X-rays and an X-ray detection unit that detects X-rays transmitted through the subject Position detecting means for detecting;
Reference image data storage means for adding the position information of the imaging system in the collection of the reference image data to the plurality of reference image data collected in the reference imaging mode,
A movement determination unit that determines a movement stop state of the imaging system based on position information of the imaging system detected by the position detection unit when collecting the fluoroscopic image data in the fluoroscopic mode;
Roadmap data for extracting, as roadmap data, reference image data having position information close to the position information of the imaging system at the time of collecting the fluoroscopic image data detected by the position detection means based on the determination result of the movement determination means Search means;
An X-ray diagnostic imaging apparatus comprising: display means for displaying the road map data and the fluoroscopic image data. 3. The X according to claim 1, wherein the position detection unit detects position information of the imaging system based on a slide movement distance and a rotation angle of a C-arm that holds the imaging system. Line image diagnostic device. The position detecting means obtains position information of the imaging system based on a drive signal supplied to a moving mechanism unit that slides or rotates the C-arm or a detection result of a position detector provided in the moving mechanism unit. The X-ray image diagnosis apparatus according to claim 3, wherein the X-ray image diagnosis apparatus is detected. The reference image data storage means further collects reference image data collection time information, elapsed time information from contrast agent administration, and FOV (Field of View) information for the plurality of reference image data collected in the reference imaging mode. When the plurality of reference image data is extracted based on the position information, the road map data search means extracts based on the collection time information, the elapsed time information, or the FOV information. The X-ray image diagnostic apparatus according to claim 1 or 2, wherein road map data suitable for the fluoroscopic image data is extracted from the plurality of reference image data. The road map data search means includes pixel value measurement means, and when a plurality of reference image data is extracted based on the position information, an average pixel value measured by the pixel value measurement means for these reference image data or The X-ray diagnostic imaging apparatus according to claim 1 or 2, wherein roadmap data suitable for the fluoroscopic image data is extracted from the extracted reference image data based on a maximum pixel value. . When the road map data search unit extracts a plurality of reference image data based on the position information, the road map selection unit includes the plurality of reference images displayed in a list on the display unit. The X-ray image diagnosis apparatus according to claim 1 or 2, wherein road map data suitable for the fluoroscopic image data is selected from the data. 3. The X according to claim 1, wherein the movement determination unit determines the movement stop state based on a temporal change in position information detected by the position detection unit.
Line image diagnostic device. The X-ray image diagnostic apparatus according to claim 1, wherein the display unit displays the fluoroscopic image data and the reference image data in a superimposed manner or in parallel. The reference image data includes contrast image data obtained by X-ray imaging in a state where a contrast medium is injected into the subject, or mask image data and contrast image data obtained by X-ray imaging before contrast medium injection. Obtained by subtraction processing with
The X-ray diagnostic imaging apparatus according to claim 1 or 2, wherein the diagnostic imaging apparatus is any one of A (Digital Subtraction Angiography) image data.

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