JPH0264442A - Scanogram apparatus - Google Patents

Abstract

PURPOSE:To widen a permeation image area by a method wherein a substance to be measured is rotated by a prescribed angle and made to traverse by a prescribed distance and collected data are rearranged to obtain permeation data. CONSTITUTION:A traverse table 31 and a rotary table 29 are set at a traverse position for each prescribed distance and at a prescribed angle of rotation respectively, and a substance 27 to be measured is set at a prescribed position. Next, a frame is moved vertically by the control of a vertical motion mechanism 43, and an X-ray emitted from an X-ray tube 23 and transmitted through the substance 27 to be measured is detected by a detector 25. X-ray permeation data of this scanner element 1 are collected by collecting element 9 and stored in a memory 11. The data in the memory 11 are stored as a cross-sectional image in a memory 17 through a preliminary processing element and a recon struction control element 15. Besides, the data are rearranged through a re arrangement control element 19 for sinogram and then stored in the memory 17. Then, a permeation image of the data in the memory 17 is displayed 21.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention is directed to a method for detecting radiation transmitted through an object to be measured and obtaining a transmitted image of the object, such as a CT scanner or a radiographic fluoroscope. The present invention relates to a scanogram device.

(Prior Art) In this type of conventional device, the object to be measured from which a transmission image is to be obtained is placed on a rotary table, this rotary table is fixed to a traverse frame, and then the object to be measured is turned toward the object. While emitting radiation such as X-rays in a fan beam,
While moving the object up and down relative to the X-rays, a detector detects the X-rays that have passed through the object, thereby obtaining a perspective image of the part of the object covered by the fan beam of X-rays. There is.

(Problems to be Solved by the Invention) Conventional devices can only obtain a transparent image of the part of the object to be measured covered by the fan beam of X-rays, so there is a problem that the transmitted image area cannot be widened. be.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a scanogram device that can widen the transparent image area.

[Structure of the Invention (Means for Solving the Problems)] In order to achieve the above object, the scanogram apparatus of the present invention includes radiation generating means that generates fan beam-shaped radiation having a predetermined angle toward the object to be measured. , a detection means disposed opposite to the radiation generating means with the object to be measured sandwiched therebetween, and detecting radiation from the radiation means that has passed through the object to be measured; traversing the object to be measured relative to a measurement system consisting of the radiation generating means and the detecting means in a direction perpendicular to the axis of rotation by the rotating means; traverse means for moving the object to be measured relative to the n1 constant system in a direction parallel to the axis of rotation; The rotating means and the traversing means are controlled so that the object to be measured is rotated by a predetermined angle and traversed by a predetermined distance in order to pass through the object. a control means for controlling the moving means to perform relative movement in a direction parallel to the axis; and collecting radiation transmission data of the object to be measured detected by the detection means during the relative movement; and a sorting means for sorting the collected data to obtain transmission data representing a series of transmission images of the object to be measured.

(Function) In the scanogram device of the present invention, the rotating means and the traversing means rotate the object to be measured by a predetermined angle and traverse the object by a predetermined distance. The object to be measured is moved relative to the object to be measured, and during this relative movement, radiation transmission data of the object to be measured is collected, and the collected radiation transmission data is rearranged to create a transmission image representing a series of perspective images of the object to be measured. We are getting data.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of a divided scanogram device according to an embodiment of the present invention.

The divided scanogram device shown in the figure has a scanner section 1 that irradiates an object to be measured with X-rays and detects the X-rays that have passed through the object. An X-ray control section 3 that controls the scanner section 1 and a mechanism control section 5 that controls the mechanism section of the scanner section 1 are connected. Further, a sequencer 7 for divided rhinoceros is connected to this mechanism control section 5.

X-ray transmission data of the object to be measured detected by the scanner section 1 is collected from the scanner section 1 by a data collection section 9,
The data is stored in the transparent data memory 11 from the data collection section 9. The transmission data stored in the transmission data memory 11 is used to reconstruct a cross-sectional image via the pre-processing section and the reconstruction control section 15, and store it in the image memory section 17 (in the case of CT scanner operation). The images are rearranged and stored in the image memory section 17 via the cyno sorting control section 19 (in the case of scanogram operation), and then displayed on the display 21 as a transparent image of the object to be measured.

2(a) and 2(b) are diagrams showing the detailed configuration of the scanner unit 1 used in the apparatus shown in FIG.
) is its plan view, and FIG. 2(b) is its side view.

The scanner section 1 includes an X-ray tube 23 that generates X-rays and a detector 25 that is disposed facing the X-ray tube 23 with a predetermined distance therebetween. An object to be measured 27 is provided between the detector 23 and the detector 25 . The δ-1 constant object 27 is placed on a rotary table 29, and the rotary table 29 is rotated by a rotation mechanism 35. The rotary table 29 is mounted on a traverse table 31, and this traverse table 31 is connected to the X-ray tube 23 and the detector 2 by a traverse mechanism 33.
The apj constant 27 is controlled to cross the X-ray from the X-ray tube 23 at right angles between the X-ray tube 23 and the detector 25. . In addition, collimators 37 and 38 are provided immediately before the X-ray tube 23 and the detector 25, respectively, so that the X-ray
The X-rays from the ray tube 23 are sent to the fan beam 45. It radiates in the form of a fan beam and transmits through the object to be measured 27, and is detected by the detector 25.
It is now detected in .

Further, the X-ray tube 23 and the detector 25 are fixed to each other by a U-shaped vertically moving frame 39, and this vertically moving frame 39 is moved vertically by a vertically moving mechanism 43 attached to a column 41, that is, in the X-ray direction. It is driven to move up and down in a direction parallel to the axis of rotation by a rotary table 29 perpendicular to the radiation direction of X-rays from the ray tube 23 to the detector 25. Note that the X-ray tube 23 is connected to the X-ray control section 3 so as to be controlled by the X-ray control section 3 shown in FIG. 1, and the detector 25 is connected to the data collection section 9 of FIG. The passing data of the object to be measured 27 detected by this detector 25 is collected by the data collecting section 9, and the rotation mechanism 35, traverse mechanism 33, and vertical movement mechanism 43 are
The machine shown in the figure is controlled by the R control unit 5 and the divided cyno sequencer 7.The traverse mechanism 33 and the support column 41 are
Fixed on top.

Next, the operation will be explained with reference to the flowchart of FIG. 3 and FIG. 4 which shows the operation of the rotary table 29 and the state of transmission of X-rays to the object 27 to be measured.

First, the δ-1 fixed object 27 is placed on the rotary table 29, and the vertical movement mechanism 43 is driven under the control of the mechanism control unit 5 to lower the vertical movement frame 39 to the lower stopping point (step 110). .

Then, the X-ray tube 23 is powered on via the X-ray controller 3 (step 120). When the X-ray tube 23 is turned on, the traverse mechanism 33 is turned on as shown in FIG. 4(a).
The traverse table 31 is driven by the target 71P.
1. While setting the constant 27 to the traverse position lX2,
Further, the rotary table 29 is set to the rotational position θ-0° via the rotation mechanism 35 (step 130).

In this way, the traverse table 31 and the rotary table 29 are moved to the traverse position X2 and the rotation angle θ-
0° and the object to be measured 27 is set at the position shown in FIG. The X-rays transmitted through the object 27 are detected by the detector 25, and this data is collected and stored in the transmission data memory 11 via the data collection section 9 (step 140). As a result, the object to be measured 2
7, data of the hatched partial area a in FIG. 4(a) is obtained. When the vertically movable frame 39 reaches the upper stopping point, the upward movement stops.

After collecting the transmission data of the object to be measured 27 at the position shown in FIG. 4(a), the traverse table 31 is driven by the traverse mechanism 33 to move the object to be measured 27 as shown in FIG. 4(b). The rotary table 29 is set to the traverse position X1 and the rotary table 29 is also set to the rotation position θ-15° via the rotary mechanism 35 (step 150), and then the vertically movable frame that has been stopped at the upper position is controlled by the vertically movable mechanism 43. While lowering 39, I Jllll
The transmitted X-rays of the fixed object 27 are detected by the detector 25, and are collected and stored in the transmitted data memory 11 via the data acquisition section 9 (step 160). As a result, the object to be measured 27 is as shown in FIG.
), obtain the transmission data of the shaded area. Further, the vertically moving frame 39 stops at a lower stopping point.

Furthermore, as shown in FIG. 4(C), the traverse table 31 is driven by the traverse mechanism 33 to set the object 27 to the traverse position -Xl, and the rotary table 29 is also driven by the rotation mechanism 35. The rotation position θ
-30° (step 170), and then, while the vertical movement frame 39 that had stopped at the lower position is raised again under the control of the vertical movement mechanism 43, the transmitted X-rays of the object to be measured 27 are detected by the detector 25. , are collected and stored in the transparent data memory 11 via the data collection unit 9 (step 180
). As a result, the transmission data of the region C of the object to be measured 27, which is a shaded area in FIG. 4(C), is detected. Further, the three vertically moving frames stop at the upper stopping point.

Then, similarly, as shown in FIG. 4(d), the traverse table 31 is driven by the traverse mechanism 33 to set the object 27 to the traverse position -X2, and the rotary table 31 is set to the traverse position -X2 via the rotation mechanism 35. 29
is set at the rotational position θ-45° (Step 190), and then the vertical movement frame 39, which had been stopped at the upper position, is lowered again under the control of the vertical movement mechanism 43, and the n1
Transmission data of the constant object 27 is detected by the detector 25, and collected and stored in the transmission data memory 11 via the data collection unit 9 (
Step 200). As a result, the PI constant 27 is the fourth
Transmission data of area d, which is the shaded area in FIG. 3(d), is obtained. Further, the vertically movable frame 39 stops at a lower stopping point. The traverse position of the traverse table 31, the rotational position of the rotary table 29, etc. described above are controlled by the divided cyno sequencer 7 via the traverse mechanism 33 and the rotation mechanism 35, respectively.

After collecting the transmission data for all areas a, b, c, and d of the object to be measured 27 as shown in FIGS. 4(a) to 4(d) in the above manner, the X-ray tube 23 cannot be turned off. Step 2
10) End data collection (step 220).

FIG. 5 shows a scanogram image obtained as described above. Each of the regions a, b, c of the object to be measured 27,
The transmission data for d is collected sequentially in the direction indicated by the arrow in the figure and stored in the transmission data memory 11, but since the direction of the arrow is opposite for each area, this collected data is It is supplied via the pre-processing section 13 to the divided cyno rearrangement control section 19, and this divided cyno'
The rearrangement is performed in one rearrangement control unit, and the whole is reproduced as continuous transmission image data as shown in FIG. 5 and stored in the image memory unit 17. This rearranged transmission image data is The image is displayed on the display 21 as a transmitted image indicated by diagonal lines.

FIG. 6 is an explanatory diagram of another embodiment of the present invention.

The device configuration of this embodiment is the same as that shown in FIG. 1 and FIG. This is intended to improve image quality by also obtaining X-ray transmission data of the object to be measured 27 in the gap. That is, in FIG. 6, each X-ray emitted from the focal point S of the X-ray tube 23 and detected by each detection element 25a of the detector 25a is determined by the interval between the detection elements, as shown by the solid line in the figure, and each detection Transmission image data of the gap between the elements cannot be obtained, but in order to cover this, in the same embodiment, the rotary table 29 and the traverse table 31 are slightly rotated and traversed, respectively, and the image shown in the figure is The purpose is to detect transmission data at the position indicated by the dotted line between the solid lines.

More specifically, in the embodiment described above, the traverse position X and rotational position θ of the table on which the object to be measured 27 is placed are
(1) X=X2, θ-00 (2) X=X+ θ-15@ (3) X--X+ θ-30° (4) However, in this example, there are 8 positions where ΔX and Δθ are added between each position, that is, (1) -X,
θ-15゜(4)X=X+ +ΔX1θ-15'+Δθ(5)X-
-X+ θ-30" (6)X--X+ +ΔX1θ-30"+Δθ(7)X
--X2, θ-45' (8) X=-X2+ΔX1θ-45''+Δθ The objective is to collect twice as much transmission data at eight positions to improve the image quality. Note that ΔX is the rotation table 29 is 1/2 of the X-ray path pitch at the center of rotation, and Δθ
is a half of the pitch angle φD of the detection element 25a.

Further, in order to simplify the rotation mechanism, it may be set to Δθ-0. In this case, the interpolation of the X-ray path becomes somewhat inaccurate, but there is no problem in practice.

[Effects of the Invention] As explained above, according to the present invention, the object to be measured is relatively rotated by a predetermined angle by the rotation means and the traverse means, and is relatively traversed by a predetermined distance by the rotation means and the traverse means.
Relatively moving the object to be measured in a direction parallel to the axis of rotation at each of these rotational positions and traverse positions,
During this relative movement, radiation transmission data of the damaged object is collected, and this collected data is rearranged to obtain transmission data representing a series of transmission images of the object. It can be taken widely.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a divided scanogram device according to an embodiment of the present invention, and FIGS. 2(a) and (b) each show the configuration of a scanner section used in the embodiment of FIG. 1. A plan view and a side view, FIG. 3 is a flowchart showing the operation of the embodiment in FIG. 1, FIG. 4 is an explanatory diagram of the operation in FIG. 1, and FIG. 5 is a transparent image obtained by the embodiment in FIG. 1. FIG. 6 is an explanatory diagram of another embodiment of the present invention. 1...Scanner section 3...X-ray control section 5...Mechanism control section 7...Sequencer for divided cyno 9...Data collection section 11...Transmission data memory 15...Reconfiguration control Section 17... Image memory section 19... Divided Cyno rearrangement control section 21... Display 23... X-ray tube 25... Detector 27... Object to be measured 29... Rotary table 31... Traverse table 33... Traverse mechanism 43... Vertical movement mechanism

Claims (1)

[Scope of Claims] Radiation generating means for generating fan beam-shaped radiation having a predetermined angle toward an object to be measured; a detection means for detecting radiation from the radiation generation means that has passed through the radiation generation means; a rotation means for relatively rotating the object to be measured between the radiation generation means and the detection means; and a rotation means for rotating the object by the rotation means. traverse means for traversing the object to be measured in a direction perpendicular to the axis of rotation relative to the measurement system comprising the radiation generating means and the detection means; a moving means for moving relative to the system; and a moving means for rotating the object to be measured by a predetermined angle so that the radiation from the radiation generating means passes through the entire cross section of the object to be measured, and traversing the object by a predetermined distance. A control means for controlling the rotation means and the traverse means, and controlling the moving means so as to cause the object to be measured to move relative to the object in a direction parallel to the axis of rotation at each of these positions and the traverse position. and a sorting means for collecting radiation transmission data of the object to be measured detected by the detection means during the relative movement, and sorting the collected data to obtain transmission data representing a series of transmission images of the object to be measured. A scanogram device comprising: