JPH02224647A - Ct device - Google Patents

Abstract

PURPOSE:To execute a contrast photographing by one operator in a condition where an attention to an object is sufficiently directed by providing an X-ray transmitting data fetching and contrast medium injection controller to start the X-ray transmitting data fetching and the contrast medium injection in the sequence and the time difference which are set beforehand. CONSTITUTION:When a photographing starting signal S2 is given, an X-ray transmitting data fetching and contrast medium injection controller 6 outputs a scanner rotation starting signal S1 and a contrast medium injection starting signal S3 to a CT scanner 2 and a contrast medium injector 5, respectively. In such a case, the X-ray transmitting data fetching and contrast medium injection controller 6 outputs the scanner rotation starting signal S1 and contrast medium injection starting signal S3 having a time difference T2 calculated according to an already-set scan delay offset time T1, the sequence of the X-ray transmitting data fetching start and contrast medium injection start and a time difference T3 between them to the CT scanner 2 and contrast medium injector 5. Thus, the CT scanner 2 and contrast medium injector 5 are interlockingly controlled, the X-ray transmitted data fetching and contrast medium injection are started in the sequence and time difference T3 to be set beforehand, and the image of a necessary time phase to the contrast medium injection can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a CT imaging device that is capable of injecting a contrast medium using a contrast medium injector and performing contrast imaging.

[Conventional technology]

A conventional CT filling device of this type is shown in FIG. In FIG. 4, 1 is a CT operation console for various settings and operations, 2 is a CT scanner equipped with a rotary plate, an X-ray tube, a detector, etc., and 3
4 is a table on which the subject 3 is placed; and 5 is a contrast medium injector for injecting a contrast medium into the subject 3.

By the way, in this type of CT imaging device, the scan start operation (imaging start operation button 1aON) and the contrast medium injection start operation (contrast medium injection start operation) are performed depending on the distance between the imaging site and the contrast medium injection site, the diagnostic purpose, etc. If appropriate timing is not taken between the button 5aON), an image that can be used for diagnosis cannot be obtained.

Therefore, conventionally, the above-mentioned timing was communicated by two people: a scan start operator waiting on the CT console 1 side and a contrast medium injection start operator waiting on the contrast medium injector 5 side. .

In addition, in a cT device, generally, the shooting start button 1a is ON.
From the scan start operation to the actual start of X-ray transmission data acquisition, there is a certain preparation time, that is, a rotation time from the rest position of the CT scanner 2 to the backswing position for constant speed rotation, and A rotation time is required from this bank swing position to the X-ray transmission data acquisition start position, which causes a delay in the actual X-ray transmission data acquisition start time.

For this reason, conventionally, as shown in FIG.
By considering the time TI until the start of capturing the radiographic data (this time is referred to as preparation time or scan delay offset time), calculating the difference time T2 between operation buttons 1a and 5a ON, and operating them. , an image in a desired time phase relative to contrast medium injection (an image in which the start time difference T3 between X-ray transmission data acquisition and contrast medium injection is arbitrarily set) is obtained.

Here, the scanning start operation by pressing the shooting start operation button 1aON is more specifically the scanner rotation start operation, so
Hereinafter, the scan start in this case will be referred to as a scanner rotation start, and the signal S1 in FIG. 4 will be referred to as a scanner rotation start signal.

Note that FIG. 5 shows an example in which the contrast medium is injected first and the acquisition of X-ray transmission data is started later.
Considering the scan delay offset time T1, the difference time T2
The operation buttons 1a and 5a were each set to ONL.

[Problem to be solved by the invention]

Conventional equipment requires two operators as mentioned above.
In addition to going against the demand for one-man operation, the contrast agent injector 5
There was a problem of radiation exposure for side operators. Moreover, these two operators must operate while taking into account the scan delay offset time, which can distract them from paying attention to the subject during the dangerous contrast medium injection process, and also lead to errors in operation. However, due to errors in time calculations, the desired timing may not be obtained.

An object of the present invention is to be able to easily and accurately set the timing between the start of X-ray transmission data acquisition and the start of contrast medium injection by operating a switch. It is an object of the present invention to provide a CT apparatus which allows contrast imaging to be performed by a single operator and which does not cause the problem of radiation exposure.

[Means to solve the problem]

The above purpose is to inject a contrast medium using a contrast medium injector and start X-ray transmission data acquisition and contrast medium injection with a preset order and time difference in a CT device capable of performing contrast imaging. This is achieved by providing a radiographic data acquisition and contrast agent injection control device.

[Effect]

When the X-ray transmission data acquisition and contrast agent injection control device receives the imaging start signal from the operation console, it starts the X-ray transmission data acquisition for a preset scan time (total X-ray transmission data acquisition time). The scanner and the contrast agent injector are controlled in conjunction with each other based on the order and time difference of the start of contrast agent injection. As a result, X-ray transmission data acquisition and contrast medium injection are started in a preset order and with a time difference.Simply by turning on the radiography start operation button, X-ray transmission data acquisition and contrast medium injection are started. This allows one operator to perform contrast imaging while paying sufficient attention to the subject. There is no need to have an operator waiting in the scanner room to initiate contrast medium injection, and there is no problem of exposure to radiation.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram schematically showing an embodiment of a CT apparatus according to the present invention. la, 3.4 and Sl are each the same as in FIG. 2 and 5 respectively show a CT scanner and a contrast agent injector as in FIG. 4, but here, these are controlled by an X-ray transmission data acquisition and contrast agent injection control device, which will be described later.

6 is an X-ray transmission data acquisition and contrast agent injection control device;
Upon receiving the imaging start signal S2 from the console 1, the CT scanner 2 and contrast agent injector 5 are controlled in conjunction, and X-ray transmission data acquisition and contrast agent injection are started in a preset order and with a time difference T3. It is something that makes you

Next, the operation of the above-mentioned apparatus of the present invention will be explained with reference to FIG. Now, press the shooting start button 1a on the CT operation console 1.
When N is selected, an imaging start signal S2 is given from the CT console 1 to the X-ray transmission data acquisition and contrast agent injection control device 6. X
Import line transmission data.

When the contrast agent injection control device 6 receives the imaging start signal S2, it sends a scanner rotation start signal S1 to the CT scanner 2.
A contrast medium injection start signal S3 is output to each contrast medium injector 5.

In this case, the X-ray transmission data acquisition and contrast medium injection control device 6
has a time difference T2 calculated according to the scan delay offset time T1, the order of the start of X-ray transmission data acquisition and the start of contrast agent injection, and the time difference T3 between them, which has already been set in this apparatus 6 or the CT console 1. The scanner rotation start signal S1 and the contrast medium injection start signal S3 are
Output to the scanner 2 and contrast agent injector 5.

As a result, the CT scanner 2 and the contrast agent injector 5 are controlled in conjunction with each other, and X-ray transmission data acquisition and contrast agent injection are started in a preset order and with a time difference T3, and the desired time phase for contrast agent injection is established. (an image in which the start time difference T3 between X-ray transmission data acquisition and contrast agent injection is arbitrarily set) is obtained.

Note that the scan delay offset time T1 is uniquely determined by the setting of the scan time (total X-ray transmission data acquisition time) T4. Therefore, the scanner rotation start point L
1 is determined, the data acquisition start time t2 is also determined automatically.

FIG. 3 is a block diagram showing a specific example of the X-ray transmission data acquisition and contrast agent injection control device 6 shown in FIG. This third
In the figure, 11 is a digital switch for arbitrarily setting the order of the start of X-ray transmission data acquisition and the start of contrast medium injection and the time difference T3 between them. Here, use the + and - selection 1a to change the above order (+: contrast medium injection starts first, -: X-ray transmission data acquisition starts first) using numerical buttons 11b to li.
The time difference T3 (seconds) between them is set in d. The time difference T3 can be set here from 99.9 to 0.1 seconds. 12 to 14 are DIF switches for setting scan delay offset time Tl (seconds).

As shown in the figure, there are three scan time T4
This is because the scan delay offset time TI can be set independently for each CT device or for each CT device.

Here, DIP switch 12 is for a scan time of 3 seconds and TI=4 seconds, DIP switch 13 is for a scan time of 4.5 seconds and T1=5 seconds.
4 is for a scan time of 9 seconds, and is set to T1=6 seconds. Therefore, when the scan time is set to 3 seconds, T1 = 4 seconds from the DIP switch 12, and when the scan time is set to 4.5 seconds, the DI
When T1=5 seconds is set from the P switch 13 and TI=5 seconds is set from the DIP switch 14, the scan time is set to 9 seconds.
6 seconds are output each.

15 is a subtractor that performs subtraction of the eight force value, (T3)-B input value (T1), 16 and 17 are selectors consisting of multiplexers, 18 is an X-ray transmission data acquisition start delay circuit, 1
9 is a contrast medium injection start delay circuit. In this case, the selectors 16 and 17 are the button 1 of the digital switch 11.
In 1a, when + (contrast medium injection starts first) is set, the data input to the 10 input terminal is set, and when - (X-ray transmission data acquisition starts first) is set,
- Output the data input to the input terminals and provide them to the X-ray transmission data acquisition start delay circuit 1 day and the contrast medium injection start delay circuit 19.

Next, the operation will be explained. First, the time difference T3 between the start of X-ray transmission data acquisition and the start of contrast medium injection is set by digital switch 1.
Set at 1. The subtracter 15 subtracts the eight force value (T3) - the B input value (T1), outputs the result value C (T2) and its sign (+, -) to the selectors 16 and 17, and depending on the content, Then, the delay time and E are given to the X-ray transmission data acquisition start delay circuit 18 and the contrast medium injection start delay circuit 19.

In this state, press the shooting start operation button 1a on the operation console 1.
If N, the imaging start signal S2 is given to the X-ray transmission data acquisition start delay circuit 18 and the contrast agent injection start delay circuit 19. As a result, the X-ray transmission day/evening acquisition start delay circuit 1
8 and the contrast medium injection start delay circuit 19 are activated to output the scanner rotation start signal %S1 and the contrast medium injection start signal S3 with a time difference T2 according to the given delay time and time.

Table 1 below exemplifies the relationship between the times A to D above when specific numerical values are used. Here, the scan time T 4
= 4.5 seconds (scan delay offset time Tl-5
(seconds).

Note that the X-ray transmission data acquisition and contrast medium injection control device 6 is
Of course, the present invention is not limited to the configuration shown in FIG. 3.

〔Effect of the invention〕

According to the present invention, the timing of the start of X-ray transmission data acquisition and the start of contrast medium injection can be easily and accurately determined by a switch operation, and the timing can be set easily and accurately with a switch operation. This system has the advantage that contrast-enhanced imaging can be performed by a single operator, and there is no problem of radiation exposure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the device of the present invention, and FIG.
The figure is a time chart for explaining its operation, FIG. 3 is a block diagram showing a specific example of the X-ray transmission data acquisition and contrast agent injection control device in FIG. 1, and FIG. 4 is a block diagram of a conventional device. FIG. 5 is a time chart for explaining the operation. 1...CT operation console, 2...CT scanner, 3...
Subject, 4... Table, 5... Contrast medium injector, 6
...X! s Transmission data acquisition, contrast agent injection control device. Patent applicant Hitachi Medical Co., Ltd. Agent Patent attorney Tadashi Akimoto 1 other person Figure S3: Postmortem sequence injection Hasei No. 4 Figure a ON

Claims (1)

[Claims] 1. In a CT device capable of injecting a contrast medium using a contrast medium injector and performing contrast imaging, X-ray transmission starts X-ray transmission data acquisition and contrast medium injection with a preset order and time difference. A CT apparatus characterized by being equipped with a data acquisition and contrast medium injection control device.