JPH0399642A - X-ray control equipment for x-ray ct apparatus - Google Patents

Abstract

PURPOSE:To enable a time interval from an end of measurement preparation to a start of X-ray on to be set up freely in accordance with a subject's reaction time by installing a set-up unit for determining that time interval at a control panel and by having an X-ray generated according to a value set by this set-up unit. CONSTITUTION:A scanner 8 receives an X-ray irradiation from an X-ray tube 10, carries out measurement and takes up measured values, and a CPU 5 in a control panel 1 makes up a CT image by using those measured values. A volume 2 (a set-up unit) on the operation panel 1 is analog-type and can be controlled freely by an operator. A reaction time X, which is a period from an end point of measurement preparation time (T2), i.e., an end point of T2 period, to a start point of subject's breath stopping, varies with the subject. Therefore, a time interval T is freely set up by the volume 2 considering variations of X due to individual differences, and an operation is carried out according to a time sequence after the setting of volume 2. It is possible, by the aforementioned devices, to prevent a blurring of chest X-ray image due to respiration, even though there are individual differences in the reaction time T.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an X-ray control device for an X-ray CT apparatus.

[Conventional technology]

In addition to the original X-ray generation function and image processing function for obtaining CT tomographic images, the X-ray CT apparatus has the ability to give voice instructions to the subject by automatically generating a voice that registers command words in advance and causes them to speak. For example, when you want to obtain a tomographic image of your chest, you are given a voice instruction to "hold your breath." Upon receiving this instruction, the subject temporarily stops breathing, and during this pause period, the chest is irradiated with X-rays. Moving parts other than the chest (abdomen, etc.)
There are similar voice instructions for .

[Problem to be solved by the invention]

In the above-mentioned conventional technology, the command to stop breathing, etc. is changed depending on the A1 measurement site of the subject. However, since the time from the automatic voice generation to the start of measurement is fixed, the difference in response (difference in breathing time) between the subjects is ignored. For this reason, elderly people and critically ill patients who have slow reactions may be forced to stop breathing.

X-ray images tend to blur.

An object of the present invention is to provide an X-ray control device for an X-ray CT apparatus in which the time from the end of voice instruction to X-ray irradiation can be freely set and varied.

[Means to solve the problem]

In the present invention, a setting device for determining the time is provided on the operation panel, and X-ray generation is caused by the setting value of this setting device.

[Effect]

According to the present invention, the setting device controls the sound generation path from point Y to point X.
Set the time until irradiation. This set value is read by the CPU and determines the time point at which the X-ray CT device starts irradiating X-rays. Thereby, even if there is a measurement difference in the start point of the respiratory hold period and the period itself, a value corresponding to the individual difference can be set in the setting device.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the X-ray CT apparatus of the present invention. This embodiment consists of a console 1, an X-ray control device 7, and a scanner (X-ray tomography device main body) 8. The scanner 8 is the X-ray tube 1
Measurements are performed in response to X-ray irradiation from 0, and the measured values are taken in and sent to a CPU (not shown) on the operation console side. A CPU (not shown) creates a CT tomographic image from the measured values.

The console 1 has a volume (setting device) 2. AD converter 3. Start switch 4. CPU5. It consists of a sound generator 6.

The scanner 8 has a speaker 9 corresponding to the sound generator 6 .

The volume 2 is of an analog type and can be freely set by the operator. The CPU 5 performs central processing of the console 1. First, the operator sets the volume 2 and the time T from the end of sound generation to the X-ray irradiation. In this state m, the start switch 4 is turned on. CPU5 is
By turning on the start switch 4, the time set by the volume 2 is read in via the AD converter 3.

The CPU 5 has a sequence function, and uses this sequencer to perform various processes and controls. Using this sequencer, the CPU 5 generates various operation commands 5a for the scanner 8, and generates an X-ray generation command Jbg to the X-ray control section 7 and a sound generation command 5c via the sound generator 6.

FIG. 2 shows an example of the operation sequence of FIG. 1. First, the start switch 4 is turned on. This ON
Sound is generated from the speaker 9 after a predetermined period of time from the start (or from the end of ON). Both the voice start point and the voice generation period T are set in advance.
It is fixed. The voice generated here is automatically generated, and is, for example, a command to the subject to ``breathe in, exhale, and hold.'' It may also be a function in which the operator generates a sound.

In this case, Ts is an arbitrary value determined by the operator.

After this Ts period has elapsed, X-ray O
An N period is commanded 5a. On the other hand, the subject stops breathing during this X-ray ON period. After the X-ray ON period ends, the voice "Please take it easy" is generated from the speaker 9 again.

The measurement ends with the above steps.

The problems here are the measurement preparation time T, the end point (T
The time ΔX from the end of period S to the start of absorption stoppage differs depending on the subject. However, even if the reaction time ΔX differs, conventionally the time ΔT from the end of the period Tr to the start of the X-ray ON period is fixed, so for elderly or critically ill patients whose ΔX approaches 8T, X-rays are applied before breathing has completely stopped. This causes blurring of the X-ray image.

Therefore, in this example, considering the magnitude of the reaction time ΔX,
It was decided that the T waiting time could be set freely.

Volume 2 is a means for this purpose.

The operator observes the condition of the subject and sets the value ΔT of volume 2 to a large value if the subject is elderly. If he is a reliable young man, the value ΔT of volume 2 will be set to a small value.

After setting this volume 2, the system operates according to the time sequence shown in FIG. 2. As a result, even if there are individual differences in reaction time ΔX, ΔT can be set in consideration of the individual differences. In this way, blurring of the X-ray image due to chest breathing can be suppressed.

3 to 6 show various embodiments of the volume t,2. Figure 3 is an example of slide volume, 0 to 4.
The settings up to seconds were set using slide 1-11-. Figure 5 is an example of a rotary type instead of a sliding type.
The setting for up to 5 seconds was set using the volume 12. FIG. 5 shows the number display 14 up/down instruction section 13.
This is an example of setting. Figure 6 shows pushbutton switch 1
This is an example according to No. 5. Besides this, a digital switch may also be used.

Although ΔT is used to set the X-ray ON period, it may be used for other control timings.

〔Effect of the invention〕

According to the present invention, X
The operator can freely set the time until the line ON start point according to the reaction time of the subject.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a time sequence diagram thereof, and FIGS. 3 to 6 are diagrams showing various embodiments of volumes. 1...Operation console, 2...Volume, 8...Scanner, 9
Diagram

Claims (1)

[Scope of Claims] 1. In an X-ray CT device that captures measurement values from X-ray irradiation on a subject and obtains a CT tomographic image, the apparatus includes: a start switch for starting CT measurement; and an automatic voice output from turning on the start switch to the subject. The operator sets the time ΔT from the elapse of the period Tr until the breathing stop command due to the outbreak to the time of X-ray irradiation to a value greater than or equal to the time from the end of the breathing stop command given to the subject by voice to the time when the subject responds to stop breathing. An X-ray control device for an X-ray CT apparatus, comprising: a setting device set by the setting device; and means for irradiating X-rays according to the settings of the setting device.