JPS6116640Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray generator that uses a computer to perform fluoroscopic imaging conditions set by an X-ray technician.

In general, X-ray fluoroscopic imaging conditions such as X-ray tube current and X-ray tube voltage (hereinafter abbreviated as "tube current" and "tube voltage") are determined by the type of phosphor plate, X-ray film, presence or absence of an X-ray grid, It is set depending on the type of photosensitive paper, the characteristics of the X-ray generator used, the type of subject, etc. In other words,
There are conditions that are set when the X-ray generator is installed, and conditions that are set by users such as X-ray technicians and doctors based on the conditions. Therefore, the conditions vary depending on the individual operator, making it impossible to obtain an X-ray image of uniform quality. Therefore, the data for setting the X-ray fluoroscopic imaging conditions are stored in a storage device, the X-ray fluoroscopic imaging conditions are set by a computer, and the generation of X-rays is controlled according to the set conditions. An X-ray generator has been proposed.
FIG. 1 is a block diagram showing one example. In the figure, 1 is an operating device for setting X-ray fluoroscopic imaging conditions, 2 is an interface for inputting the conditions into the computer main body 3 (hereinafter abbreviated as "CPU"), and 4 and 5 are the X-ray Fluoroscopic imaging conditions and X
Memories such as ROM and RAM for storing data such as conditions set when installing the line generator, 6 a CRT display for displaying setting conditions, etc.
7 is an X-ray generation control device for controlling the tube current and tube voltage of the X-ray generation device 8; 9 is an X-ray generation control device 7 such as an adjustment motor (hereinafter referred to as a self-winding transformer); 10 is a motor drive interface for controlling this motor, 11 is a semiconductor switch 12 for applying voltage to the X-ray generator 8, and an interface between the semiconductor switch 12 and the CPU 3. A gate drive circuit consisting of a face 13, 14 a power supply, 15 an AD converter, and 16 and 17 fluoroscopy and imaging start switches, respectively.

In the computerized X-ray generator configured as described above, the operation when setting the tube voltage, for example, will be explained.

When the controller 1 is set to a predetermined tube voltage value,
Data corresponding to this tube voltage value is input to the CPU 3 via the condition setting interface device 2. The CPU 3 takes in this data, transfers the data to the display device 6, and calculates the primary voltage value of the high voltage transformer necessary to provide the input set tube voltage value. Next, find the actual high voltage transformer primary voltage value.
The output voltage of the autotransformer 7 is taken in through the AD converter 15 and compared with the calculated primary voltage value, and if the output voltage of the autotransformer 7 is too low for the predetermined tube voltage value, it is increased, and if it is too high, it is decreased. The motor 9 is driven via the motor drive interface 10, and when a predetermined voltage is reached, the motor 9 is turned off.
Wait for the start signal for fluoroscopy or imaging.

When the start switch 16 or 17 for fluoroscopy or imaging is pressed and a start signal is input,
The set tube voltage is applied to the high voltage transformer via the gate drive circuit 11, and a predetermined X-ray is irradiated.

In setting the tube voltage as described above, it is adjusted only when the tube voltage condition is input, so it remains as it is unless the next new tube voltage condition is set.

Therefore, if the tube voltage is left as it is for a long time after being set, the voltage will change due to power supply drift during that time, and X-rays will be irradiated under conditions different from the set tube voltage value, resulting in uniform image quality. X-ray images may not be obtained. Additionally, there is a risk that an overvoltage will be applied to the X-ray tube, damaging the X-ray tube.

The present invention was developed to solve the above-mentioned problem. Predetermined values for X-ray fluoroscopy and imaging conditions such as X-ray tube voltage and X-ray tube current are set using a computer, and the fluoroscopy or imaging start switch is turned on. In the computerized X-ray generator which controls X-ray generation based on the setting conditions, the actually set X-ray fluoroscopy when the fluoroscopy or imaging start switch is turned on or a procedure for checking whether or not the imaging conditions are set to the setting conditions, and as a result of the check, the actually set X-ray fluoroscopy or imaging conditions and the setting conditions are different from each other. The present invention provides an X-ray generating device characterized in that it is equipped with software consisting of a procedure for re-adjusting the X-rays in some cases, and a procedure for generating X-rays after the re-adjustment is completed.

The present invention will be explained in detail with reference to Examples below.

FIG. 2 is a flow chart for explaining the present invention. Figure a is a flowchart for setting conditions, b
The figure is an X-ray irradiation flowchart.

In FIG. 1, the operating device 1 is set to a predetermined tube voltage value and the fluoroscopy or imaging start switch 16 is turned on.
Alternatively, until the button 17 is pressed, the same program as the conventional one is used as shown in FIG. 2a. When the fluoroscopy or imaging start switch 16 or 17 is pressed and a start signal is input, this start signal is taken into the CPU 3 via the condition setting interface 2, and based on this signal, the start signal is input via the AD converter 15. The state of the current left single-winding transformer 7 is checked again, and if it is different from the predetermined set value, the motor 9 is driven again to correct it, and when it is confirmed that the set value has been reached, the motor 9 is turned off. Ru. Next, the semiconductor switch 12 is driven via the gate drive interface 13 and X-rays are irradiated.

These steps are shown in a flowchart as shown in Figure 2b. It goes without saying that the tube current can also be set in the same manner.

As explained above, according to the present invention, in any case, the actually set fluoroscopy or imaging conditions such as the set tube voltage value and set tube current immediately before X-ray irradiation are checked, and then the Since the rays are irradiated, an X-ray image of uniform quality can always be obtained. Furthermore, there is no risk of damaging the X-ray tube or the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a computerized X-ray generator, and FIG. 2 is a flowchart for explaining an embodiment of the present invention. 1...Controller, 2...Condition setting interface, 3...CPU, 4, 5...ROM, RAM, 6...
... Display device, 7 ... Autotransformer, 8 ... X-ray generator, 9 ... Adjustment motor, 10 ... Motor drive interface, 11 ... Gate drive circuit, 15
...AD conversion device, 16, 17...fluoroscopy, photography start switch.

Claims (1)

[Scope of utility model registration request] By setting predetermined values of X-ray fluoroscopy and imaging conditions such as X-ray tube voltage and X-ray tube current using a computer, and turning on a fluoroscopy or imaging start switch, X-ray generation is controlled based on the set conditions. In the computerized X-ray generator, it is checked whether the actually set X-ray fluoroscopy or imaging conditions when the fluoroscopy or imaging start switch is turned on are set to the setting conditions. As a result of the check, if the actually set X-ray fluoroscopy or imaging conditions and the setting conditions are different, readjust the settings, and after the readjustment is completed, An X-ray generator characterized by comprising software comprising a procedure for generating rays.