JPH0584236A - Ct device - Google Patents

Abstract

PURPOSE:To provide the CT device which can realize a real time display of a CT image. CONSTITUTION:The CT device is constituted of a scan shaft circuit 25 for instructing a start and an end of a CT scan, a CT scanner 11 for executing automatically and repeatedly the CT scan of a body to be examined in response to the start of the CT scan, and finishing the CT scan in response to the end of the CT scan, and a display means 14 for displaying successively CT image data obtained successively by the repeated CT scan by the CT scanner 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CT device for obtaining a tomographic image of a subject.

[0002]

2. Description of the Related Art A CT apparatus is used to perform a CT scan on a subject and display CT image data obtained by this CT scan as a tomographic image of the subject, and the X-ray CT apparatus is the most popular. Ultrasonic CT device, NMR
(Nuclear magnetic resonance) CT apparatus and the like have been studied and put to practical use.

In a conventional X-ray CT apparatus, an X-ray fluoroscopic image of a subject is displayed on a monitor, and a tomographic position and the number of images, that is, slice lines and the number of slices are set in the fluoroscopic image, and the setting is completed. Sometimes a CT scan is started. That is, the CT scan is started after the tomographic position and the number of images to be photographed are determined in advance.

[0004]

A conventional CT apparatus is a C
When performing T-scan, CT scan is started after determining various conditions such as slice position and number of slices in advance. However, in recent years, as the shooting time and the maximum administration time are shortened, real-time property is required for CT image display, and this real-time property can be satisfied.
The advent of T-devices is strongly desired. Therefore, an object of the present invention is to realize a real-time display of CT images in C
It is to provide a T device.

[0005]

According to the present invention, CT
CT means for instructing the start and end of the scan, CT scanner means for automatically and repeatedly executing the CT scan of the subject in response to the start of the CT scan and ending the CT scan in response to the end of the CT scan; C constituted by display means for sequentially displaying CT image data sequentially obtained by repeated CT scan by the scanner means
A T-device is provided.

[0006]

The operator can arbitrarily determine the start and end of the CT scan by the CT scan start / end instruction means, and the CT scan means automatically performs the CT scan from any slice position of the subject in response to the start of the CT scan. CT on the display means in real time
Images, that is, cut images of an arbitrary number of frames are sequentially displayed.

[0007]

Embodiments will be described below with reference to the drawings.

As shown in FIG. 2, the X-ray CT apparatus includes an examination room section including a scanner body (CT scanner or gantry) 11 and a bed (pouch) 12, a console 13 and a monitor 14 as shown in FIG. , And an operation room including a computer cabinet, an X-ray controller, and the like (not shown). The console 13 is provided with an operation panel 15.

As shown in FIG. 1, the operation panel 15 includes
Scan switch 21, bed movement (+) switch 22,
A bed movement (-) switch 23 is provided. It should be noted that it is preferable to use a lock-type switch that turns on the scan switch once it is activated and turns it off when it is activated again. The scan switch 21 is connected to a scan start circuit 25 provided in the console 13. The scan start circuit 25 is coupled to the CT scanner 11 and is provided to send a scan start signal and a scan end signal to the CT scanner 11 in response to ON / OFF of the scan switch 21. The CT scanner 11 is connected to the data acquisition circuit 26, performs an X-ray CT scan of the subject in response to the scan start signal, and outputs an X-ray detection signal obtained thereby to the data acquisition circuit 26. The data acquisition circuit 26 is coupled to the image reconstruction circuit 27 and collects the detected signals, that is, the acquired data, into the image reconstruction circuit 27.
It is provided for outputting to. An image reconstruction circuit 27 is coupled to the monitor 14 and is provided to reconstruct the acquired data and output the image signal to the monitor 14.

The operation panel 15, the data acquisition circuit 26, the image reconstruction circuit 27 and the bed movement control circuit 28 are the CPU 2
9, the data collection circuit 26 and the image reconstruction circuit 27 are connected to the CPU 2 in response to an input signal from the operation panel 15.
9, the bed movement control circuit 29 is connected to the bed movement (+) switch 22, the bed movement switch (−) switch 23, and the scan start circuit 25, and C
It is provided to control the movement of the bed 12 according to the switch signal and the start signal as well as the signal from the PU 29. Next, the operation of the X-ray CT apparatus having the above configuration will be described.

First, the PAS provided on the operation panel 15
Shooting conditions are preset by a switch (not shown). The imaging conditions include conditions such as slice pitch, slice width, tube voltage, tube current, and scan time that are uniquely determined according to the subject. After that, when the scan switch 21 is turned on, the scan start circuit 25 supplies a scan start signal to the scanner 11. At this time, the scanner 11 is set to the imaging condition according to the imaging condition data from the CPU 29, and X-ray CT scans the subject at a predetermined slice pitch and slice width. In this case, the slice pitch is determined by the moving speed of the bed 12. This is obtained by supplying a slice pitch signal from the CPU 29 to the bed moving control circuit 28 and controlling the moving speed of the bed 12 according to the slice pitch signal. Be done. still,
The movement direction of the bed 12 is determined by the operation of the bed movement switches 22 and 23. When the switch 22 is turned on, the bed 12 moves toward the scanner 11, that is, moves forward, and when the switch 23 is turned on, the bed 12 is turned on. Moves backward from the scanner 11.

The X-ray detection signal obtained from the scanner 11 at each slice position of the subject is collected by the data collection circuit 26, and the collected data is input to the image reconstruction circuit 27. The image reconstruction circuit 27 reproduces the collected data according to a known image reproduction method, outputs the reproduced image signal to the monitor 14, and displays it as a CT image, that is, a tomographic image.

A series of operations such as the above X-ray CT scan, data acquisition, image reconstruction and display, that is, a scan cycle is automatically repeated until the scan switch 21 is turned off. The displayed tomographic image is displayed on the monitor 14 in real time. In this scan cycle, the bed 12 is moved in the forward direction,
When observing the CT image at this time and wanting to observe the CT image at the position that has passed through again, when the bed movement (-) switch 23 is turned on, the bed 12 moves backward and passes. An X-ray CT scan is again performed on the subject at the slice position, and the CT image can be observed.

In the above embodiment, the lock type switch is used as the scan switch, but a normal ON / OFF switch may be used as the scan switch.
The present invention can be applied to not only the line CT apparatus but also an ultrasonic CT apparatus and an NMR (nuclear magnetic resonance) CT apparatus.

[0015]

According to the present invention, the operator simply controls the on / off of the scan switch 21 to accurately observe the diagnostic region while continuously observing CT images without setting a slice position in advance. It can be confirmed and the end of shooting can be arbitrarily determined. Further, by appropriately operating the forward and backward bed movement switches, the slice position can be arbitrarily moved back and forth, and the CT image can be reconfirmed.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a CT apparatus according to an embodiment of the present invention.

FIG. 2 is a side view showing the configuration of an examination room section of the CT apparatus shown in FIG.

3 is a front view showing a console of an operation room of the CT apparatus shown in FIG.

[Explanation of symbols]

11 ... CT scanner, 12 ... bed, 13 ... console,
14 ... Monitor, 15 ... Operation panel, 21 ... Scan switch, 22, 23 ... Bed movement switch, 25 ... Scan start circuit, 26 ... Data collection circuit, 27 ... Image reconstruction circuit, 28 ... Bed movement control circuit, 29 ... CPU.

Claims (2)

[Claims] 1. A means for instructing the start and end of a CT scan, and a CT for automatically and repeatedly executing a CT scan of a subject in response to the start of the CT scan and ending the CT scan in response to the end of the CT scan. A CT device comprising scanner means and display means for sequentially displaying CT image data sequentially obtained by repeated CT scans by the CT scanner means. 2. The CT apparatus according to claim 1, further comprising means for arbitrarily setting a relative movement direction between the subject and the CT scanning means in order to sequentially change a tomographic position of the subject.