JPS60203880A - Radiation diagnozing device - Google Patents

Abstract

PURPOSE:To improve space resolution and density resolution by accumulating electrons radiated from a photoelectric part in an information storage part to store radiation information. CONSTITUTION:When radiant rays 2a projected from a subject or transmitted through the subject are made incident on a fluorescent part 1a, visual light is emitted from the fluorescent part 1a and electrons are radiated from the photoelectric part by the visual light. The electrons are accelerated by DC potential V1 applied between the information storage part 1d and the earth, reached to the information storage part 1d and stored as the radiation information of the subject. The information storage part 1d storing the radiation information is scanned by an information reading means 3 and the radiation information is outputted through an amplifier 4 and an A/D converter 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a radiation diagnostic apparatus, and particularly to one with an improved radiation detection section.

[Technical background of the invention and its problems] Radiological diagnostic equipment includes those that obtain b'iQJ-ray (gamma ray) images by detecting gamma rays emitted from a subject to the outside of the body, and those that obtain b'iQJ-ray (gamma ray) images by detecting gamma rays emitted from a subject to the outside of the body. Some devices obtain radiation (X-ray) images by detecting.

The former method is used, for example, in nuclear medicine, and can obtain still images, but has the drawback of very poor spatial resolution.

The latter also includes, for example, digital radiography (DF).
) device, which makes it possible to display moving images, but has the drawbacks of narrow dynamic range and latitude, that is, poor linearity and poor density resolution.

[Object of the Invention] The present invention has been made in view of the above circumstances, and provides a radiological diagnostic apparatus that improves spatial resolution and concentration resolution and can obtain radiation information from a subject as an image that is easy to diagnose. For the purpose of providing.

[Summary of the Invention] A summary of the present invention for achieving the above-mentioned object is to have a radiation detection section capable of detecting radiation and storing radiation information of a subject due to this radiation, In a radiological diagnostic apparatus that obtains a radiographic image of a subject by scanning and reading radiation information with light or heat and performing image processing, the radiation detection unit includes:
It consists of a fluorescent part that converts radiation into visible light, a photoelectric part that emits electrons by the visible light emitted by the fluorescent part, and an exoelectron emitting substance, and the electrons emitted from the photoelectric part are used as a subject. The device is characterized in that it includes an information storage section that can store radiation information, and an 11-il transparent electrode that detects electrical signals caused by exoelectrons emitted from the information storage section.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a radiological diagnostic apparatus that is an embodiment of the present invention. 1 detects gamma rays emitted from a subject 2 to the outside of the body or X-rays that have passed through the subject 2, and also detects gamma rays or X-rays (hereinafter referred to as
3 is an information reading means for reading radiation information by scanning the radiation detecting section 1 with light or heat; An amplifying section that amplifies radiation information (electrical signal) read out from the radiation detecting section 1 by the information reading means 3; 5 is the amplifying section 4;
An A/D (analog/digital) converter 6 converts the output of the A/D converter 5 into a digital signal, and 6 performs image processing (e.g. density conversion, addition, defield 2 contour extraction 1) on the output of the A/D converter 5.
7 is a display section that displays the processing results of the image processing section 6, and 8 is a storage section that stores the processing results of the image processing section 6 as necessary.

Next, the detailed configuration of the radiation detection section 1 will be explained based on FIG. 2. 18 is a fluorescent part, and this fluorescent part 1a is made of, for example, C81, BiaGea 012, Ca
It is formed into a plate shape from WO5, Na1, etc., and converts the incident radiation 2a into visible light.

1b is a photoelectric part, and this photoelectric part 1b is made of, for example, Sb.
-Cs, Sb -, -Na-Cs, etc. are formed into a plate shape, and are grounded (earthed) via a conductive wire 1C, and emit electrons by visible light emitted from the fluorescent portion 1a. 1d is an information storage section, which contains exoelectron-emitting substances such as Be0 (Li), Aj! 203 or the like, and a direct current potential Vl (positive electrode) is applied through the conductive wire 1e, and the electrons emitted from the photoelectric section 1b are accumulated as radiation information. Reference numeral 1f denotes a conductive transparent electrode, which is laminated on the electron storage section 1d and to which a DC potential Vo (positive electrode) is applied via a resistor 9.

Note that the negative electrodes of Vl and Vo are grounded.

Further, the inside of the radiation detection section 1 is kept in a vacuum.

Next, the operation of the apparatus configured as described above will be explained. Radioactive isotope (R・1) administered into subject 2
) When radiation 2a emitted from the subject 2 or emitted from an X-ray tube (not shown) and transmitted through the subject 2 enters the fluorescent section 1a, visible light is emitted from the fluorescent section 1a, Electrons are emitted from the photoelectric section 1b by the light. Electrons emitted from the photoelectric section 1b are accelerated by the DC potential (1) applied between the information storage section 1d and the ground, reach the information storage section 1d, and are stored as radiation information of the subject 2.

When the information reading means 3 scans the information storage section 1d in which the radiation information is stored using light or heat, exoelectrons are emitted from the electron storage section 1d.

These exoelectrons are emitted to the information storage section 1d in accordance with the amount of previously accumulated electrons (electrons emitted from the photoelectric section 1b), and due to this exoelectron emission, the conductive transparent electrode 1
A current flows through f. In other words, the information storage unit 1 is stored in electronic form.
The radiation information accumulated in d is sequentially read out by scanning by the information reading means 3. The radiation information (electrical signal) read out by the information reading means 3 is amplified by the amplifying section 4, converted into a digital signal by the A/D converting section 5, and then subjected to image processing such as density conversion by the image processing section 5. will be done.

The radiation information after the image processing is displayed as an image on the display unit 7, and is stored in the storage unit 8 as necessary. 1
It is fied.

Note that the image display on the display section 7 has two display modes. That is, by synchronizing the scanning by the information reading device 3 with the scanning of the display unit 7, the first mode for displaying a moving image in real time, and the information reading process @3 after a predetermined period of time have elapsed. This is the second mode in which a still image is displayed by operating.

Although one embodiment of the present invention has been described above, it goes without saying that the present invention is not limited to the above embodiment, and can be modified as appropriate within the scope of the gist of the present invention. An example of this will be described below.

FIG. 3 is an explanatory diagram of a modification of the above-mentioned embodiment, and parts having the same functions are marked with the same symbol.

The difference between FIG. 3 and FIG. 2 is that a multi-channel plate (MCP) 1 ( ) is placed between the photoelectric section 1 b and the information storage section 1 d in the radiation detection section 1. Direct current potentials V2 and V3 (both positive electrodes) with reference to the earth potential are applied to the plate 1-1g.In this way, the electrons emitted from the photoelectric section 1b are transferred to the multichannel plate Io. The sensitivity of the radiation detection section 1 to the radiation 2a is further improved than in the embodiment described above.

Effect 1 of the Invention According to the present invention described above, the following effects can be achieved.

Radiation information is accumulated by accumulating electrons emitted from the photoelectric section in the information storage section, so the dynamic range and latitude are widened, linearity is improved (concentration resolution is improved), and the length of the radiation information is Time can be accumulated.

In addition, the radiation information stored in the information storage section is read by emitting exoelectrons from the information storage section and detecting the electric signal caused by the exoelectron emission via a conductive transparent electrode, so the S/N is low. At the same time, the spatial resolution of radiographic images also improves.

Therefore, the present invention provides a medically and clinically very useful fl
It is possible to provide an l-ray diagnostic device.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing the configuration of a radiological diagnostic apparatus that is an embodiment of the present invention, and Fig. 2 is an explanation showing the M4 configuration of the radiation detection section in the apparatus shown in Fig. 1. 3 are explanatory diagrams for explaining a modification of the device shown in FIGS. 1 and 2. FIG. 1... Radiation detection section, 1a... Fluorescent section, 1b... Photoelectric section, 1d... Information storage section, 1f... Conductive transparent electrode, 2...
...Subject, 2a...Radiation. Agent Patent Attorney Masayoshi Misawa-4nee ゝ-L 58→ □□□□

Claims (1)

[Claims] A radiation detection section that can detect radiation and store radiation information of the subject due to this radiation is installed, and the radiation information stored in this tIi ray detection section is read out by scanning with light or heat, and image processing is performed. In the radiation diagnostic apparatus, the radiation detection section converts radiation into visible light by converting the radiation image of the subject into 4ξ/Ik radiation. a photoelectric section that emits; an information storage section that includes an exoelectron-emitting substance and that can store the electrons emitted from the photoelectric section as radiation information of the subject; and an information storage section that uses exoelectrons emitted from the information storage section A radiological diagnostic device comprising: a conductive transparent electrode that detects an electrical signal;