JPS61103376A - X-ray diagnostic device - Google Patents

Abstract

PURPOSE:To obtain a picture excellent in contrast and resolution independently of the scanning mode by providing a camera controller controlling an electron beam amount of an image pickup tube in response to the control of the scanning mode by a system controller. CONSTITUTION:When an image pickup mode is set in response to the purpose of diagnosis, the system controller 8 controls an X-ray generating section 1, a processor 6 and the camera controller 9 in response to the image pickup mode. Thus, the X-ray generating section 1 exposes an X-ray toward a body P to be checked, the X-ray transmitted through the body P to be checked is converted into an optical image by an I.I2 and made incident on an image pickup tube of a television camera 4. On the other hand, the camera controller 9 adjusts the electron beam amount and beam focus of the image pickup tube of the camera 4 in response to the scanning mode by using the scanning mode selection signal from the system controller 8. Thus, the picture with excellent contrast and resolution is obtained independently of the scanning mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention provides an XI! method for obtaining an X-ray image for diagnosis based on X-rays transmitted through a subject. Related to diagnostic equipment.

[Technical background of the invention and its problems] In an X-ray diagnostic device, an X-ray contrast mode is selected based on the diagnostic purpose and constraints on the characteristics of the device, and the selected Xaa
The scanning mode of the television camera is selected depending on the shadow mode.

Here, the scanning mode items of a television camera include the scanning line scanning method, number of scanning lines, scanning time for one screen, distinction between continuous operation and intermittent operation, etc., and the optimum mode for each item is selected. Ru.

By the way, when the scanning mode is changed, the input/output characteristics of the image pickup tube included in the television camera are changed.

This will be explained below based on FIGS. 3 and 4.

FIG. 3 is an input/output characteristic diagram of the image pickup tube in each scanning mode under continuous operating conditions, and FIG. 4 is an input/output characteristic diagram of the imaging tube in each scanning mode under intermittent operating conditions. Figures 3 and 4
In the figure, a is the case where the number of scanning lines is 525, interlaced scanning, and the scanning time is 33m5ec, b is the case where the number of scanning lines is 525, sequential scanning, and the scanning time is 33+++SeC, and C is the case where the number of scanning lines is 1050, sequential scanning. , scanning time 1321DS
This is the case of eC. As is clear from FIGS. 3 and 4, when the scanning mode changes as in a, b, and c, the saturation current value of one tube changes. For this reason, depending on the scanning mode, the performance of the image pickup tube cannot be fully exploited, resulting in a disadvantage that the contrast resolution of the obtained Xa image is reduced.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an X-ray diagnostic apparatus that can obtain images with excellent contrast resolution regardless of changes in the scanning mode of the television camera. .

[Summary of the Invention] A summary of the present invention for achieving the above object is characterized in that the camera controller includes a camera controller that controls at least an electron beam of an image pickup tube in accordance with control of a scanning mode by a system controller. Ao-c-, i5
a.

[Embodiment 1 of the Invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an X-ray diagnostic apparatus according to an embodiment of the present invention. 1 is an X-ray generation unit that generates X-rays to be emitted toward the subject P, and 2 is an image intensifier (hereinafter referred to as 1) that converts the X-rays transmitted through the subject P into an optical image.
．． (abbreviated as I), 3 is this 1. An optical system that guides the output image of I2 to a television camera to be described later; 4 is a television camera having an image pickup tube that converts the optical image incident through this optical system 3 into an electrical signal; 5 is this television camera 4; A/D (Analog/Digital) converts electrical signals from
6 is a processor having a memory for storing the output of this A/D converter 5 and arithmetic means for performing predetermined arithmetic processing; 7 is a processor that converts the object to be examined based on the video signal from this processor 6; A monitor for displaying the X-ray image of
'1Tla': J>h.

For example, the roller controls the X** radiation of the X-ray generator 1 and the image processing of the processor 6 according to the set X-ray imaging conditions, and also controls the camera controller (to be described later) to set the scanning mode. Outputs selection signal.

9 is a camera controller that sets the scanning mode of the television camera 4 and adjusts the amount of electron beam emitted from the electron gun of the picture tube and the beam focus in accordance with the scanning mode selection signal from the system controller 8. .

Next, details of the television camera 4 and camera controller 9 will be explained with reference to FIG.

FIG. 2 is a block diagram showing details of the television camera and camera controller in the apparatus shown in FIG. This is a coil that changes the focus of the electron beam emitted from the gun. Further, 22 is disposed within the camera controller 9, and the image pickup tube 2
A G1ff1 pressure controller 23 that controls the amount of electron beam by varying the voltage applied to the first grid of 0 is disposed within the camera controller 9, and by varying the current flowing through the coil 21, This is a focus current controller that controls beam focus.

Next, the operation of the embodiment device having the above configuration will be explained.

When the m-shadow mode is set according to the purpose of diagnosis, the system controller 8 controls the X-ray generator 1 . The processor 6 and camera controller 9 are controlled.

Under the control of the system controller 8, the X-ray generating section 1 emits X-rays toward the subject P.

Then, the X-rays transmitted through the subject P are converted into an optical image by 1.12, and this is transmitted to the television camera 4 via the optical system 3.
The light is incident on the image pickup tube 20 inside.

On the other hand, in response to a scanning mode selection signal from the system controller 8, the camera controller 9 plots the electron beam amount and beam focus of the image pickup tube 20 according to the scanning mode of the television camera 4.

Here, the adjustment of the electron beam suspension in each scanning mode is as follows:
In each scanning mode, it is preferable to match the amount of electron beam when the signal current is saturated.

This is because by adjusting in this way, the dynamic range of the television camera 4 can be utilized to the maximum for each scanning mode.

The amount of electron beam can be adjusted using the image pickup tube 20. This can be easily done by changing the voltage applied to the first grid constituting the electron gun.

The electrical signal from the image pickup tube 20 is appropriately amplified within the television camera 4, and then sent to the processor 6 via the A/D converter 5.
is input. The processor 6 performs various calculations related to image processing under the control of the system controller 8,
The result of the calculation is displayed on the monitor 7 as an X-ray image of the subject P.

As described above, according to the apparatus of this embodiment, the television camera 4
Control the beam amount of the image pickup tube 20 inside
a,. 15,8□yo-8,tsu. The dynamic range of the camera 4 can be utilized to the fullest, and as a result, an X-ray image with excellent contrast resolution can be obtained. In addition, even if the electron beam amount is changed, 1liW
By controlling the beam focus of the tube, the beam focus will not shift, so an X-ray image with excellent spatial resolution can be obtained.

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 implemented with appropriate modifications within the scope of the gist of the present invention. .

For example, in the above embodiment, the camera controller 9 is arranged outside the television camera 4, but it can also be arranged inside.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide an X-ray diagnostic apparatus that can produce images with excellent contrast resolution and spatial resolution regardless of changes in the scanning mode of the television camera. .

[Brief explanation of drawings]

FIG. 1 is a block diagram of an X-ray diagnostic apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing details of a television camera and camera controller in the apparatus shown in FIG. 1, and FIG. FIG. 4 is an input/output characteristic diagram of the a15J tube in each scanning mode. FIG. 4 is an input/output characteristic diagram of the imaging tube in each scanning mode under intermittent operating conditions. 4...TV camera, 8...System controller, 9...
Camera controller, 20... image pickup tube. Agent Patent Attorney Masayoshi Misawa Figure 3 Figure 4

Claims (2)

[Claims] (1) Displays an X-ray image of a subject, comprising a television camera having an image pickup tube capable of converting an optical image into an electrical signal, and a system controller that controls the scanning mode of the television camera according to the X-ray imaging mode. In the X-ray diagnostic equipment that
An X-ray diagnostic apparatus comprising: a camera controller that controls at least an amount of electron beam of the image pickup tube in accordance with control of a scanning mode by the system controller. (2) The X-ray diagnosis according to claim 1, wherein the camera controller controls the electron beam amount of the image pickup tube and the beam focus in accordance with the control of the scanning mode by the system controller. Device.