JPS584534A - Radioactive ray diagnostic apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radiological diagnostic apparatus that enables medical diagnosis using radiographic information such as X-rays and R-rays, and particularly relates to a radiation generator that generates radiation, and a radiation generator that generates radiation. a radiation controller for controlling the radiation output of the generator, the radiation generating 5OW;
A radiation projection detection device in which a radiation detector provided opposite to the radiation generator is integrally fixed; , a subject support device for inserting and supporting a subject between the collimator and the radiation detector of the radiation projection detection device, and scanning for relatively moving and scanning the radiation projection detection device and the subject support device. The drive mechanism, this scanning drive mechanism, and the radiation projection detection device are all controlled to obtain projection information of the subject from the radiation detector, and perform predetermined digital image processing on the radiation fluoroscopic image of the subject. An information processing device that obtains t and 1 obtained by this information processing device.
The present invention relates to a radiological diagnostic apparatus equipped with a display device for displaying important information.0 Conventional X-ray film diagnostic apparatuses include The problem is that the concentration resolution is poor and the subject is exposed to a large dose of radiation. The relationship between the position of the area and the region of interest is not clear, and it is difficult to link them. Therefore, even when conducting a detailed examination by performing indirect photography and then direct photography,
Indirect photography cannot be used for direct detailed examinations.For these reasons, a large amount of radiation must be irradiated to the subject in order to make a reliable diagnosis.

On the other hand, digital transmission using an X-ray tomography device (@CT device) is only used for preliminary positioning of the tomography. The resolution and concentration resolution are poor, and it cannot be used for diagnosis.Since the original purpose of the Mara device itself was to obtain a cross-section*', consideration was given to obtaining high resolution III/It- with the minimum exposure dose. The present invention was developed in consideration of this difficult situation, and it is possible to reduce the radiation dose of the subject during the initial examination, to easily specify the area, and to shorten the measurement time. In addition, even in detailed examinations, the aim is to provide a radiation detector [k] that makes it possible to directly utilize the information from the initial examination to reduce the total radiation exposure of the subject and obtain high-resolution images useful for diagnosis. .

That is, the features of the present invention include: radiation f: a radiation generator that generates; a radiation controller that controls the radiation output of the radiation generator; A radiation projection detection device in which a sound-controllable movable collimator 1 and an order ray detector provided opposite to the radiation generator are integrally fixed; the movable collimator and radiation 1I of this radiation projection detection device;
tIiIi A patient support device that inserts and supports a specimen Km between the radiation projection detector and the patient support device, a scanning drive mechanism that moves and scans relative to the radiation projection detection device and the patient support device, and this scan drive mechanism and the an information processing device that controls a projection detection device to obtain projection information of the subject from the radiation detector and obtains image information of a radiographic image of the subject through predetermined digital processing; Displays the next image information obtained by the device.1 In the radiology diagnosis wit equipped with a health display device, there is an examination site selection switch for selecting between the initial examination and vas examination O, and the subject O target. A site selection switch for selecting a site and a Kll cardiac region designation operation device are provided in the input operation section, and the initial examination is selected in response to the input from the input operation section for information purification.
When a detailed examination is selected, set the exposure dose (tW!) for the selected region to the projection condition that minimizes the exposure dose and shorten the imaging time, and when a detailed examination is selected, set the exposure dose to the subject O-exposure for the region of interest. An embodiment of the present invention will be described with reference to FIG. 0 Fig. 1 is a schematic block diagram showing the configuration of an embodiment of the present invention, and No. ** is a view of part 70 seen from the ! direction. is the operation] (To h in the channel
o On this operation panel 1 are [Initial inspection] and 1.
An inspection mode selection switch consisting of two push-button slides displaying ``Detailed Inspection A'' and a site selection switch consisting of n push-button slides each displaying a site name are provided. 11) When the O button switch is pressed, the projection conditions set in advance to minimize the exposure dose of the subject I are stored and stored in the computer 3 serving as the information II & communication device in the rLx table. The signals corresponding to the projection conditions are sent to the radiation controller 4. Irradiation field controller i
, is given to the gantry movement controller C1 signal collection time control IIr, and 4) The equipment is set to the projection conditions. As specified in the conditions. The generated nine rays are set by a movable premeter 9 adjusted by the irradiation field controller 1 to form a flat beam having a narrow beam in the two directions shown in the figure and parallel to the x-y plane. Subject 1' placed on bed 10
f: The transmitted radiation is detected by one-dimensional array detection l1iII in the X direction, in which n detection units are lined up at a predetermined angular interval at a predetermined distance from the focal point of the fan-shaped beam. The radiation control a4. Radiation tightening generator8. Irradiation field controller5. Collimator 9. - The dimensional array detector 11 is fixed to the same pedestal 12, and the pedestal 12 is set at 0 position in the y direction according to the projection condition by the gantry movement controller C, and in two directions based on the projection condition. It is configured to move sequentially.

- The object transmission information detected by the dimensional array detector 11 is controlled by the chimp ring tie erected by the signal collection timer R and the A/D (Anajig/Digital) converter JJ.
The radiographic two-dimensional digital information obtained with the movement of the gantry 12 is sequentially input to the electronic computer 1, which is then converted into a digital signal. At the same time, information on the movement of the gantry 12 is also input into the computer 3. At the same time, the movement information of the gantry 110 is also input to and stored in the electronic computer S.
processes the digital signal and produces an image mar to display a two-dimensional Ii image, that is, a radiation transmission image, on the image display device 14. The image of the octopus is stored in the image storage device 15 as a digital signal.

If further detailed inspection is required, the image display device 1
Region of interest specifying device 11 capable of specifying the region of interest of image No. 4
It has 1f. FIG. 3 shows the image displayed on the image display [J4] during the initial inspection. This figure shows the image 1iisr of the image display device 14 and the abdomen 18 of the subject 1, but the specified region 19kK1 is specified by operating the operation section of the region of interest specifying device IC shown in the figure. Cn! on operation panel 1. When the pushbutton switch fk of lI #If) is pressed, the projection conditions for maximizing the #1 degree resolution and spatial resolution t- of the region of interest are set on the electronic computer 1.
The information is selected from the n-sentence table stored in advance and transmitted to the radiation controller 41R, the field control IJ, and the gantry movement control 61.
2. Signal collection time system - @10 Transmit to each device and perform projection conditions, respectively. In particular, at this point 4, mount J2 is set at the start position of the region of interest 1.0 And in 2 directions When scanning starts, the pedestal 12 moves according to the positional information of the region of interest 1# held in the electronic calculator 11J and the irradiation field information, and the collimator 9 is automatically adjusted. The detailed examination III health obtained is enlarged and displayed as ↓↓enlarged 2- in Fig. 4. SaraKo detailed inspection lIigI changes etc. in the overall picture tllllll
If desired, it can also be displayed by embedding it in the next initial inspection image SO as shown in Figure 3. A range that can identify differences equal to fluctuations! ! The amount of sea urchin is kept constant. On the other hand,
Subject 20: Because there is a large difference in the radiation transmission and the absorption coefficient of each region, one dose of g4 is applied to the region where the transmission thickness is small.
#! On the contrary, if the transmission thickness is large or the absorption coefficient is large, the number of bits will be set too finely than the fluctuation of the radiation quantum. The computer 3 is set in advance to the Luna-j constant ◆, which allows the use of up to 1lllll bits without waste. Then, using this image, only the area of interest can be closely inspected, the radiation dose of the subject as a whole will be significantly reduced, and it will be possible to obtain a high-resolution image of the area of interest. In this way, not only can it be used for screening in a radiation isolation system, but it can also be used directly for precision screening. I! Images can be automatically converted to K11b with simple operations such as one push button switch operation.
It is also easy to operate, making it possible to make the most of the equipment's functions and perform diagnosis under conditions that minimize exposure dose. , it also has the advantage of being easy to review again.

Note that the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with various modifications within the scope of the invention. For example, in the above embodiments, linear-dimensional sequence detection is possible. Although the radiation detector was used in 11 meetings, even if it is a two-dimensional detector, the radiation detector is not suitable. t
Radiation used for radiation includes neutron beams, single heavy particle beams, light particle beams, etc. The radiation used for projection may be pulsed radiation rather than continuous radiation. In the above embodiment, the radiation controller 4 controls the tube current when selecting the projection conditions.

If you set all the tube voltage and exposure time,
Of course, it is difficult to change the -S group among them.

If the present invention is implemented in the manner described in detail above, it will be possible to reduce the radiation exposure of the subject during the initial examination, to easily specify the site, and to shorten the measurement time. Radiation that makes it possible to directly utilize information to reduce the total radiation dose to the subject and obtain high-density scale images useful for diagnosis! ! ! Diagnostic equipment [can be provided].

[Brief explanation of the drawing]

Fig. 1I61 is a block diagram of the configuration of an embodiment of the present invention in an IK style, Fig. 2 is a diagram showing a part of Fig. 1111 in the A good state from the fx direction, and Fig. 3 is a diagram showing the initial inspection display 'fight'. , FIG. 4 is a diagram showing an enlarged display ms obtained by detailed inspection of the entire region of interest in the 11th initial inspection shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Operation panel, 2... Subject, 3... Electronic computer, d... Radiation controller, 5... Irradiation field controller, 6
... gantry movement controller, 1... signal collection time controller,
8... Radiation generator, 9... Movable collimator, 10...
... Bed, 11...-Next row detector, 12... Frame,
1j...A/D (analog-digital) converter, 1-...1mgII display device, 15...image storage device, II...region of interest specifying device. Patent attorney Suzue xi

Claims (1)

[Claims] A radiation generator that generates radiation, this radiation generation 1)0
The radiation detector is integrated with a radiation controller that controls radiation output, a movable collimator that is provided at the irradiation port of the radiation generator and that can control the radiation detector, and rt7 that is provided facing the radiation generator. A fixed order ray projection detection device, a subject support device for inserting and supporting a subject between the movable collimator and the radiation detector of the radiation projection detection device, and a subject support device for inserting and supporting the subject, and the radiation projection detection device and the subject support device. 1. A waterfall basin driving mechanism that moves and scans relatively, and controlling this scanning driving mechanism and the radiation projection detection device to detect the radiation! 1. An information processing device that obtains the projection information of the subject O and obtains a predetermined digital image @11Kz image information 1 of a radiographic image of the subject, and iii. an image display that displays the health information obtained by this information processing device. Input operation 11KW1t of the examination mode selection switch for selecting the initial examination and detailed examination, the site selection switch for selecting the target part of the subject O, and the region of interest specifying operation device in the radiological diagnostic equipment equipped with the apparatus. In addition, in response to the input operation S to O input to the information processing device, when the w-period examination is selected, the exposure dose [
Projection condition t# that minimizes the minimum shooting time! ! ,
and when a detailed examination is selected, the radiation projection detection device according to the projection conditions tI and tI to minimize the total exposure dose of the subject and obtain high resolution for the specified region of interest. A radiological diagnostic device characterized by having the function of controlling