JPH0274854A - Fluoroscopic apparatus - Google Patents

Abstract

PURPOSE:To pick up through-vision image without distortion out of parallel data, to display the image continuously and to obtain a stereoscopic display by editing the collected through-vision image data of a material to be measured for every detecting piece again. CONSTITUTION:An X-ray tube 11 is turned ON. At the same time, a scanning mechanism 15 is driven through a mechanism control part 23. A material to be measured 17 is made to traverse so as to cross a part between the X-ray tube and a detector 13. Transmitted X-ray data from the material to be measured 17 are detected with the detector 13 and collected into an image data memory 45. Then the traversing is performed by the same way at a position where the X-ray tube 11 and the detector 13 are lowered by a specified pitch with an elevator 19, and the data are collected. The image data which are collected in the image data memory 45 are edited again in a data selector 47. The result is stored in a display memory 49. The display of the image data on a display 57 is switched at a speed close to the after image time of the naked eye. In this way, the stereoscopic through-vision image with a fan angle as a viewing angle is displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION Field of Industrial Application The present invention relates to a fluoroscopic device that detects radiation transmitted through an object to be measured and obtains a fluoroscopic image of the object.

(Prior art) Among this type of fluoroscopic equipment, the so-called third generation conventional C
A method of collecting fluoroscopic image data using a T-scanner is not shown in FIG. As shown in Figure (a), the fluoroscopic device is
For example, fan beam-shaped X-rays with a fan angle of 34 degrees are generated from the X-ray generator 1 and transmit through the entire range of the measurement area of the object to be measured 3 in one radiation, and the transmitted X-rays are transmitted to the detector. 5
is configured to cover the entire image area so that all light is received. Therefore, a perspective image of the object to be measured 3 can be obtained by relatively moving the object to be measured 3 in the vertical direction. In addition, (b) of the same figure shows image data obtained by fan data using fan beam-shaped X-rays, and shows the rows of the number of channels corresponding to the number of detectors constituting the detector 5 and the vertical direction. The image data consists of a data pitch of .

(Problem to be Solved by the Invention) In the conventional method described above, the image is
・Geometric expansion occurs in the channel direction. On the other hand, no enlargement occurs in the vertical direction because the object to be measured 3 moves in the vertical direction. Therefore, an inconvenience has arisen in that the image has distortions in the horizontal and vertical directions.

In addition, the so-called second generation C-" scanner, which traverses the object 3 by rotation (rotation) 83 and parallel movement, uses fan beam-shaped X-rays with a narrow fan angle. However, the detector does not cover the entire image area, and such fluoroscopic images have not been obtained.

The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide a fluoroscopic device that can take undistorted fluoroscopic images based on parallel data and display them continuously to obtain a three-dimensional display. It is in.

[Structure 1 of the Invention (Means for Solving and Overcoming the Problems) In order to achieve the above object, the fluoroscopic apparatus of the present invention includes a radiation generating means that generates fan beam-shaped radiation toward an object to be measured, a detecting means comprising a plurality of consecutively arranged detectors disposed opposite to the radiation generating means and configured to detect radiation from the radiation generating means that has passed through the object to be measured; a moving means for moving the object to be measured horizontally and vertically relative to the detecting means; a data collection means for collecting data obtained by detecting the radiation; a re-editing means for re-editing the data collected by the data collection means for each detector;
The gist of the present invention is to include an output means for outputting the data re-edited by the re-editing means as an image.

(Function) In the fluoroscopic apparatus of the present invention, the object to be measured is irradiated with fan beam-like radiation while moving the object to be measured relatively laterally and vertically, and the radiation transmitted through the C1 object to be measured is emitted. Detected by a detection means. Next, this detection data is collected using a one-day collection means, and the collected perspective image data of the object to be measured is re-edited for each detector constituting the detection means to obtain a three-dimensional perspective image.

(Example) The present invention will be described in detail below using screens.

FIG. 1 is a diagram showing the configuration of a fluoroscopic device according to an embodiment of the present invention. The fluoroscope shown in the same figure uses X as a radiation source.
It has a detector 13 disposed opposite to an X-ray tube 11 that generates rays, and a scan mechanism section 15 is disposed between these X-ray tubes 11 and the detector 13. An object to be measured 17 is placed on the enclosure portion 15 . The object to be measured 17 is rotated by the scanning mechanism section 15 and moved I-J across the space between the X-ray tube 11 and the detector 13.

Further, the X-ray tube 11 and the detector 13 are connected to each other via a U-shaped support arm 18, and are configured to be movable up and down by an elevator 19, that is, in a direction perpendicular to the drawing. . In addition, the X-ray tube 11
A collimator 12 is provided at the straight bend of the tube 11 to focus the X-rays from the X-ray tube 11 into a thin fan beam with a fan angle of 15''.

FIG. 2 is a side view of the mechanism section of the apparatus shown in FIG. As shown in FIG.
Rotation/traverse table 15 comprising 5
The rotation/traverse table 15a is placed on a pedestal 15b.

Further, the X-ray tube 11 and the detector 13 are connected to each other by the support arm 18 as described above, and the X-ray tube 11 is attached to an elevator 19 as shown in FIG. 11 and the detector 13 are movable in the vertical direction with respect to the object to be measured 17, and can collect perspective image data of the object to be measured 17 in the -F downward direction.

Returning to FIG. 1, the detector 13 is a data acquisition device (DAS).
)21. This data collection device 21 collects fluoroscopic data of the object to be measured 17 detected by the detector 13 and supplies it to the central control device 25 . In addition, the scan mechanism section 15 and one elevator are R lateral control section (M-CON).
23, and this mechanism control section 23 is connected to the central control device 2.
5.

The central control device 25 has a CPU 27, and this CPU 27
is connected to the main memory (MM) 31 via two DMA buses,
Floppy disk (FD) 33, fixed disk (DI)
SK) 35 and data input/output interface (010
) 37 and an interface (I/F
) 39 to a multipath 41, and via this multipath 41 an interface (I/F) 43, image data memory (IM>45, data selector 47, display memory (DISP-'M) 49 , a display interface (D15P-[/F) 51 and a data shifter 53. An ice display 57 such as a CRT is connected to the display interface 1-51. /F)43,
Image memory ([M) 45, data selector 47, display memory (DISP-M) 49, display interface (DISP-1/F) 51, and data shifter 53 are connected to each other via image bus 55. .

The mechanism control unit 23 has a data input/output interface 37
The data collection device 21 is also connected to the interface 43 . The collected data from the detector 13 collected by the data collecting device 21 is stored in the image data memory 45 via the interface 43 under the control of the CPU 27.

FIG. 3 is an explanatory diagram illustrating the data collection operation of this embodiment.

The detector 13 has a detector channel number N that covers the X-rays from the XLa tube 11 at a fan angle α (15° in this embodiment).
for example, 88 detectors, and the fan angle α
The object to be measured 17 traverses across the area, and data is collected during this time. Then, for each traverse, the elevator 19 repeats the operation of descending or ascending by a prescribed pitch corresponding to the distance between pixels, so that a predetermined number of data strings can be collected.

FIG. 4(a) shows the data collected in this way, with the data string (N) in the traverse direction shown in the horizontal direction.
The vertical direction indicates the vertical direction (n), and (Nxn) data are collected. That is, the data strings obtained by one traverse are N columns corresponding to the number of detectors, and are (NXn) columns of data, which is the product of the number n of vertical descents.

The number of data points in the data string is controlled by a data collection timing pulse triggered by a pulse signal from an encoder provided in a mechanism during traversal, and a predetermined number of data points are taken. This collected data is transmitted from the detector 13 to the data collection 8
The image data is temporarily stored in the image data memory 45 via the storage 21 and the interface 43.

The image data stored in the image data memory 45 in this way is selected by the data selector 47 as shown in FIG. 4(b).
2, 3. . . . The data is edited as N image data, which is the maximum number of detector channels, as shown as N.

FIG. 5 is an explanatory diagram of the conversion method performed by this data selector 47.

The projection data collected by the detector 13 is divided into a data array Pl, P2 . . . . is a block for each traverse of Pn, but the image obtained by the first detector among the N detectors is Pi-1, P2- as shown by the arrow in the figure. 1°P3-1.・・・・・・、
Pn-1 is selected and stored in the first image data area of the display memory 49. Similarly, the second image is Pl-2, P'2-2, P3-2. ......, P.N.
Select -2. If this operation is performed for all N detectors, it is possible to cover all the Huhnon angles α and obtain images seen individually by all the detectors 13.

Next, the operation will be explained with reference to the flowchart in FIG.

First, the X-ray tube 11 is turned on, and the mechanism control section 23
The scanning mechanism section 15 is driven through the X-ray transmission data from the object 17 is detected by the detector 13 while the object 17 is traversed between the X-ray tube 11 and the detector 13. and send this data to the data collection device 21
and image data memory 4 via interface 43.
5 (steps 110, 120).

After completing the traverse operation between the X-ray tube 11 and the detector 13 and collecting data from this traverse, the elevator 19 moves the X-ray tube 11 and the detector 13
130), and collect data by traversing in the same way at this lowered position. When this lowering operation is performed a predetermined number of times, n times, the data collection operation is completed (steps 140 and 150). after that,
The image data collected in the image data memory 45 is converted by the data selector 47 as shown in FIG.
), the re-edited and stored image data is sequentially read out via the display interface 51, and the display is switched on the display 57 at a speed close to the afterimage time of the naked eye. It is displayed as a stereoscopic perspective image with viewing angle α (step 180).

FIG. 7 shows the rotation traverse (RT
) is a diagram showing the perspective direction of each detection channel obtained by the two-generation method, and the projection from different directions with an angle of 0 (for example, 88 channels with a fan angle of 15°, 88 directions at 15°/87 intervals) is shown. The output of each channel of the detector is shown.

Further, the data shifter 53 provided in FIG. 1 has a function of arbitrarily shifting data in the fan angle direction of the image, that is, a function of shifting and applying image data in the traverse direction.

Three-dimensional image display becomes possible by shifting the image data of each channel in the fan angle direction and then processing and displaying the image data. Further, by adding colorization and shading processing, it becomes possible to display even more advanced three-dimensional images.

[Effects of the Invention] As explained above, according to the present invention, the object to be measured is collected by moving the object relatively laterally and vertically while irradiating the object with radiation. Since the fluoroscopic image data is re-edited for each detector and a 3D fluoroscopic image is displayed, a fluoroscopic image without distortion due to parallel beams can be obtained, and since the angle of each detector is different, a 3D image with the fan angle as the viewing angle can be obtained. A fluoroscopic image is obtained. Furthermore, by increasing the amount of information in the image, a high-precision perspective image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a fluoroscopy device using parallel projection data according to an embodiment of the present invention, FIG. 2 is a side view showing the structure of the mechanical part of the fluoroscopy device in FIG. FIG. 4 is an explanatory diagram showing the data collection operation in the fluoroscopy device shown in FIG. 1. FIG. 4 is an explanatory diagram showing the image data editing method in the fluoroscopy device shown in FIG. An explanatory diagram showing the method, Figure 6 is 3! of Figure 1! ! FIG. 7 is a flowchart showing the operation of the viewing device, FIG. 7 is a diagram showing the perspective direction for each detection channel, and FIG. 8 is an explanatory diagram showing the conventional editing method of perspective image data. 11... X-ray tube 13... Detector 15... Scan mechanism section 17... Measured object 19... Elevator 21... Data collection device 25... Central control device 45... Image data memory 7...Data selector 49...Display memory 53...Data shifter 57...Display

Claims (1)

[Scope of Claims] Radiation generating means for generating fan-beam-shaped radiation toward an object to be measured; and radiation generating means disposed opposite to the radiation generating means with the object to be measured, the radiation passing through the object to be measured. Detection means consisting of a plurality of consecutively arranged detectors for detecting radiation from the radiation generation means, and movement for moving the object to be measured laterally and vertically relative to the radiation generation means and the detection means. a means for collecting data obtained by relatively moving an object to be measured using the moving means and detecting radiation transmitted through the object using the detecting means; A fluoroscopy apparatus comprising: a re-editing means for re-editing the data collected in each of the detectors; and an output means for outputting the data re-edited by the re-editing means as an image.