JP2567052B2 - Scanogram device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention detects a radiation transmitted through an object to be measured and obtains a transmission image of the object to be measured, for example, a CT scanner or a fluoroscopic apparatus. Scanogram device.

(Prior Art) In this type of conventional apparatus, an object to be measured for which a transmission image is to be obtained is placed on a rotary table, the rotary table is fixed to a traverse frame, and then the object is measured. A fan beam of X-rays is generated by radiating radiation, for example, X-rays in a fan beam shape, and moving the DUT up and down with respect to the X-rays while detecting X-rays that have passed through the DUT with a detector. A perspective image of the portion of the measurement object that has been covered is obtained.

(Problems to be Solved by the Invention) The conventional apparatus has a problem that it is not possible to obtain a wide transmission image area because a perspective image of a portion of the measured object covered with the X-ray fan beam cannot be obtained. .

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a scanogram apparatus capable of taking a wide transparent image area.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, a scanogram apparatus of the present invention is a radiation generating means for generating fan-beam-shaped radiation having a predetermined angle toward an object to be measured. A detection means arranged to face the radiation generating means while sandwiching the object to be measured, and detecting radiation from the radiation means that has passed through the object to be measured; and the detection means to detect the radiation from the radiation generating means. Rotating means for rotating relative to the means, and a traverse relative to the measuring system composed of the radiation generating means and the detecting means in the direction perpendicular to the axis of rotation by the rotating means. Traverse means for moving, moving means for moving the object to be measured relative to the measurement system in a direction parallel to the axis of rotation, radiation from the radiation generating means While rotating the DUT by a predetermined angle to pass through the surface, controlling the rotating means and the traverse means so as to traverse by a predetermined distance, with respect to the DUT at each of these rotational positions and traverse positions Control means for controlling the moving means so as to perform relative movement in a direction parallel to the axis of rotation, and radiation transmission data of the DUT detected by the detecting means during the relative movement are collected. And rearranging means for rearranging the collected data to obtain transmission data representing a series of transmission images of the object to be measured.

(Operation) In the scanogram device of the present invention, the object to be measured is rotated by a predetermined angle by the rotating means and the traverse means, and is traversed by a predetermined distance, and at each of these rotational positions and traverse positions, a direction parallel to the axis of rotation is provided. The object to be measured is moved relative to the object, the radiation transmission data of the object to be measured is collected during this relative movement, and the collected radiation transmission data is rearranged to show a series of transparent images of the object to be measured. I'm getting the data.

(Examples) Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a split scanogram apparatus according to an embodiment of the present invention. The split scanogram apparatus shown in the figure has a scanner unit 1 for irradiating an object to be measured with X-rays and detecting X-rays transmitted through the object to be measured. The scanner unit 1 includes an X-ray tube of the scanner unit 1. To control X
A mechanism control unit 5 for controlling the mechanism units of the line control unit 3 and the scanner unit 1 is connected. Further, a divided sino sequencer 7 is connected to the mechanism control section 5.

The X-ray transmission data of the DUT detected by the scanner unit 1 is collected by the data collecting unit 9 from the scanner unit 1 and stored in the transmission data memory 11 from the data collecting unit 9. The transmission data stored in the transmission data memory 11 is reconstructed into a sectional image through the preprocessing unit and the reconstruction control unit 15 and stored in the image memory unit 17 (in the case of CT scanner operation), and is also divided. Sorting control unit for sino
The images are rearranged via 19 and stored in the image memory unit 17 (in the case of scanogram operation), and then displayed on the display 21 as a transmission image of the DUT.

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

The scanner unit 1 has an X-ray tube 23 that generates X-rays and a detector 25 that is arranged facing the X-ray tube 23 with a predetermined distance therebetween. 23 and detector 25
An object to be measured 27 is provided between and. The object to be measured 27 is placed on a rotary table 29, and the rotary table 29 is rotated by a rotary mechanism 35. The rotary table 29 is mounted on the traverse table 31, and the traverse table 31 is traversed by the traverse mechanism 33 so as to traverse between the X-ray tube 23 and the detector 25. Tube 23 and detector 25
Is controlled so as to cross the X-ray from the X-ray tube 23 at a right angle. Incidentally, collimators 37 and 38 are provided immediately in front of the X-ray tube 23 and the detector 25, respectively, whereby the X-rays from the X-ray tube 23 are radiated as a fan beam 45 in a fan-beam shape to irradiate the DUT 27. It is transmitted and detected by the detector 25.

The X-ray tube 23 and the detector 25 are fixed to each other by a U-shaped vertical moving frame 39, and the vertical moving frame 39 is moved in the vertical direction by the vertical moving mechanism 43 attached to the column 41, that is, X It is driven so as to move up and down in a direction parallel to the axial direction of rotation by a rotary table 29 perpendicular to the radiation direction of X-rays from the radiation tube 23 to the detector 25. The X-ray tube 23 is connected to the X-ray controller 3 so as to be controlled by the X-ray controller 3 shown in FIG.
25 is connected to the data collecting section 9 of FIG.
The passing data of the DUT 27 detected in step 1 is collected by the data collecting part 9, and the rotating mechanism 35, the traverse mechanism 33 and the vertical movement mechanism 43 are controlled by the mechanism control part 5 and the sequencer 7 for divided sino shown in FIG. It is supposed to be done. The traverse mechanism 33 and the support column 41 are fixed on the base frame 47.

Next, the operation of the flow chart of FIG. 3 and the operation of the rotary table 29 of FIG. 4 and the X-ray transmission state with respect to the DUT 27 will be described with reference to FIG.

First, the object to be measured 27 is placed on the rotary table 29, and the vertical movement mechanism 43 is driven by the control of the mechanism control unit 5 to lower the vertical movement frame 39 to the lower stop point (step 11).
0).

Then, the X-ray tube 23 is powered on via the X-ray controller 3 and turned on (step 120). When the X-ray tube 23 is turned on, as shown in FIG. 4 (a), the traverse mechanism 33 drives the traverse table 31 to set the DUT 27 at the traverse position X ₂ and also through the rotation mechanism 35. Then, the rotary table 29 is set to the rotary position θ = 0 ° (step 130).

Thus traverse table 31 and rotary table
29 are set to the traverse position X ₂ and the rotation angle θ = 0 °, respectively, and the object to be measured 27 is set to the position shown in FIG. 4 (a). Then, the vertical movement mechanism 43 controls the vertical movement frame 39.
While raising the temperature, the detector 25 detects the X-rays transmitted from the X-ray tube 23 through the object to be measured 27 and collects and stores this data in the transmission data memory 11 via the data collector 9 (step 140). . As a result, in the object to be measured 27, the data of the partial area a shaded in FIG. 4A is obtained. When the vertical movement frame 39 reaches the upper stop point, the ascending operation is stopped.

When the transmission data of the object to be measured 27 at the position shown in FIG. 4 (a) is collected, 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). While setting the traverse position X ₁ ,
Further, the rotary table 29 is rotated through the rotary mechanism 35, and the rotational position θ is 15
(Step 150), and while the vertical movement frame 39, which was stopped at the upper position by the control of the vertical movement mechanism 43, is lowered, the DUT 27 is detected by the detector 25, and the data is detected. The data is collected and stored in the transparent data memory 11 via the collecting unit 9 (step 160). As a result, the object to be measured 27 obtains the transmission data of the shaded portion and area b in FIG. 4 (b). Further, the vertical movement frame 39 stops at the lower stop point.

Then, as shown in FIG. 4 (c), the traverse mechanism 31 is driven by the traverse mechanism 33 to drive the object to be measured.
27 is set to the traverse position −X ₁ , and the rotary table 29 is set to the rotary position θ = 30 ° via the rotary mechanism 35 (step 170), and then the vertical table 43 is controlled to stop at the lower position. While raising the vertically moving frame 39 again, the transmitted X-rays of the object 27 to be measured are detected by the detector 25, and are collected and stored in the transparent data memory 11 via the data collecting unit 9 (step 180). As a result, the object to be measured 27 has the transmission data of the shaded portion and area c in FIG. 4 (c) detected. Further, the vertical movement frame 39 stops at the upper stop point.

Then, similarly, as shown in FIG. 4 (d), the traverse mechanism 33 drives the traverse table 31 to set the object to be measured 27 at the traverse position −X ₂ and also rotates via the rotating mechanism 35. The table 29 is set at the rotational position θ = 45 ° (step 190), and then the vertical movement mechanism 43 is controlled to lower the vertical movement frame 39 stopped at the upper position again, and the transmission data of the DUT 27 is measured. It is detected by the detector 25 and is collected and stored in the transparent data memory 11 via the data collecting unit 9 (step 200). As a result,
The object 27 to be measured obtains the transmission data of the shaded portion and area d in FIG. 4 (d). Also, the vertical movement frame
39 stops at the lower stop. The traverse position of the traverse table 31 and the rotary position of the rotary table 29 are controlled by the disassembly / sino sequencer 7 via the traverse mechanism 33 and the rotary mechanism 35, respectively.

As described above, when transmission data for all areas a, b, c, d of the object 27 to be measured is collected as shown in FIGS. 4 (a) to (d), the X-ray tube 23 is turned off ( Step 210),
Data collection ends (step 220).

FIG. 5 shows a scanogram image obtained as described above. The transmission data for the respective areas a, b, c, d of the DUT 27 are sequentially collected in the directions shown by the arrows in the figure and are stored in the transmission data memory 11, but the directions of the arrows are different. Since it is the opposite for each region, the collected data is supplied to the disassembly-sino rearrangement control unit 19 via the preprocessing unit 13, and the divided-sino rearrangement control unit 19 performs rearrangement, As shown in the figure, the entire transmission image data is reproduced and stored in the image memory unit 17, and the rearranged transmission image data is displayed on the display 21 as a transmission image indicated by diagonal lines in FIG. There is.

FIG. 6 is an explanatory view of another embodiment of the present invention. The apparatus configuration of this embodiment is the same as the configuration shown in FIG. 1 and FIG. 2 described above, but in this embodiment, the plurality of detection elements 25a constituting the detector 25 are arranged between adjacent detection elements. It is intended to obtain the X-ray transmission data of the DUT 27 in the gap to improve the image quality. That is, in FIG. 6, each X-ray radiated 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 distance between the detection elements as shown by the solid line in FIG. Although transmission image data of the gap between the elements cannot be obtained,
In order to cover this, in the present embodiment, the rotary table 29 and the traverse table 31 are slightly rotated and traversed, respectively, to detect the transmission data at the positions indicated by the dotted lines corresponding to the solid lines in the figure. It is a thing.

More specifically, in the above-described embodiment, the traverse position X and the rotation position θ of the table on which the object 27 to be measured is placed.
(1) X = X ₂ , θ = 0 ° (2) X = X ₁ , θ = 15 ° (3) X = −X ₁ θ = 30 ° (4) X = −X ₂ , θ = 45 Although there are four positions, the distance between each position is Δ in this embodiment.
Eight positions where X and Δθ are added, ie (1) X = X ₂ , θ = 0 ° (2) X = X ₂ + ΔX, θ = 0 ° + Δθ (3) X = X ₁ , θ = 15 ° (4) X = X ₁ + ΔX, θ = 15 ° + Δθ (5) X = −X ₁ , θ = 30 ° (6) X = −X ₁ + ΔX, θ = 30 ° + Δθ (7) X = −X ₂ , Θ = 45 ° (8) X = −X ₂ + ΔX, θ = 45 ° + Δθ, which is twice the transmitted data at eight positions, and the image quality is improved. In addition, ΔX is a rotary table
It is half the X-ray passage pitch at the center of rotation of 29, and Δθ is half the pitch angle φD of the detection element 25a.

Further, Δθ = 0 may be set to simplify the rotation mechanism.
In this case, the interpolation of the X-ray path becomes slightly inaccurate, but practically no problem.

[Effects of the Invention] As described above, according to the present invention, the object to be measured is relatively rotated by a predetermined angle by the rotating means and the traverse means, and the object is relatively traversed by a predetermined distance. In the above, the object to be measured is relatively moved in a direction parallel to the axis of rotation, radiation transmission data of the damaged object is collected during this relative movement, and the collected data is rearranged to make a series of objects to be measured. Since the transmission data representing the transmission image of is obtained, the transmission region of the measured object can be wide.

[Brief description of drawings]

FIG. 1 is a block diagram showing the construction of a split scanogram apparatus according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) show the construction of a scanner unit used in the embodiment of FIG. 1, respectively. FIG. 3 is a plan view and a side view, FIG. 3 is a flow chart showing the operation of the embodiment of FIG. 1, FIG. 4 is an explanatory view of the operation of FIG. 1, and FIG. 5 is a transmission image obtained in the embodiment of FIG. FIG. 6 is an explanatory view of another embodiment of the present invention. 1 ... Scanner section 3 ... X-ray control section 5 ... Mechanism control section 7 ... Division sequencer sequencer 9 ... Data collection section 11 ... Transparent data memory 15 ... Reconstruction control section 17 ... Image memory section 19 …… Sorting control unit for split sino 21 …… Display 23 …… X-ray tube 25 …… Detector 27 …… Measured object 29 …… Turning table 31 …… Traverse table 33 …… Traverse mechanism 43 …… Up and down Dynamic mechanism

Claims (1)

(57) [Claims] 1. Radiation generating means for generating fan-beam-shaped radiation having a predetermined angle toward an object to be measured; and an object to be measured which is arranged so as to sandwich the object to be measured and which opposes the radiation generating means. Detecting means for detecting the transmitted radiation from the radiation generating means, rotating means for relatively rotating the object to be measured between the radiation generating means and the detecting means, and the rotating means by the rotating means. Traverse means for relatively traversing the object to be measured in a direction perpendicular to the axis with respect to the measurement system consisting of the radiation generating means and the detecting means, and the object to be measured in a direction parallel to the axis of rotation. A moving means for moving the object to be measured relative to the object to be measured, and the object to be measured is rotated 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 a traversing device is moved by a predetermined distance. The moving means so as to perform relative movement in a direction parallel to the axis of rotation with respect to the measured object at each of these positions and traverse positions. Control means for controlling, and collecting the radiation transmission data of the DUT detected by the detecting means during the relative movement, rearranging the collected data and transmitting data representing a series of transmission images of the DUT. A scanogram device comprising: