JPS60145128A - X-ray ct apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an X-ray CT apparatus (computer tomography apparatus).

(b) Conventional X-ray CT apparatuses usually first take a CR image (X-ray transmission image) of the patient and use this to formulate a scanning plan. By the way, the conventional X! In an ICT device, a series of scans executed in a scanning plan all have the same slice thickness, and if you want to scan another area with a different slice thickness, repeat CR after a series of scans. It is necessary to take an image or call up the same CR image and make a scanning plan again based on this.

By the way, in general, when taking a CT image of the head, in order to avoid the influence of partial volume artifacts in areas with many complex bones such as the base of the brain,
It is said that it is important to scan with a thin slice thickness of about 10 mm, and to scan with a thick slice thickness of 10 mm for the top of the head, etc., in order to obtain clearer CT images.

However, even when performing head photography like this,
With conventional devices, changing the slice thickness as described above complicates the operation, and the actual situation is that thick slices are used even at the base of the brain, which is a serious problem.

(c) Purpose This invention improves the ability to easily plan and execute a series of scans consisting of different slice thicknesses such as 10.5.2 mm, thereby capturing CT images with high diagnostic value. An object of the present invention is to provide an X-ray CT apparatus that can easily perform the following functions.

(D) Configuration The X-ray CT apparatus according to the present invention moves an object into a gantry in which an X-ray tube and an X-ray detector are disposed facing each other, and a space between the X-ray tube and the X-ray detector. a moving device that reconstructs one tomographic image from data obtained by one scanning of a subject by the gantry and the moving device, a control device for the gantry and the moving device, and the X-ray tube and X-ray detector; From the data obtained by moving the subject relative to the X-ray tube and X-ray detector,
An image calculation circuit that creates a radiographic image, an image display device that displays the above-mentioned radiographic image, and scanning start and end positions while moving a cursor on the screen on which the X-ray radiographic image is displayed. an input device for inputting a series of scanning plans by inputting information consisting of intervals and slice thicknesses; a storage device for storing the input series of scanning plans; and an input device for reading out and applying the stored scanning plans. Therefore, it is characterized in that it includes a central control unit that executes a series of scanning operations.

(E) Embodiment In FIG. 1, the gantry l has a tunnel portion 2, and a patient 4 is lying on the top plate of the bed device 3, and as this top plate moves, the patient 4 It is inserted into part 2. Inside the gantry l, an X-ray tube 5 and an X-ray detector 8 are disposed facing each other with a tunnel section 2 in between. When the tunnel section 2 is irradiated and the patient 4 is placed inside the tunnel section 2, the X-ray beam 7 that passes through the patient 4 is detected as an X-ray? (The gantry 1 is designed to tilt to freely change the angle of the X-ray beam 7 with respect to the patient 4. Also, the bed device 3 allows the patient 4 to The country 1 and bed device 3 are controlled by a control and data acquisition device 9, and can be moved by an X-ray detector. Data is collected from the signal from 8. The image calculation circuit 10
When the patient 4 is inserted into the tunnel part 2 of the gantry 1, the X-ray tube 5, collimator 6, and detector 8 make one rotation around the patient 4, and one scanning with the X-ray beam 7 is performed. A CT image is reconstructed by calculating the obtained data, and a CR image is created from data obtained when the patient 4 is moved by the bed device 3 simultaneously with X-ray exposure.

When planning a scanning plan, first, the computer 13 issues a command to the control and data acquisition device 9, and the bed device 3 moves the patient 4 into the tunnel section z. Irradiation with the line beam 7 is performed. As a result of such CR image scanning, the image calculation circuit IO can create a CR image in the range in which the patient 4 has moved, and this is displayed on the image display device 11. If a CR image of the head as shown in Fig. 2 is displayed,
While looking at this image, create a scanning plan as shown in Figure 2. Then, by operating the input device 12 consisting of a track pole, keyboard, switch, etc., and moving the cursor on the screen, first specify the tilt angle with the cursor.
Next, specify the scanning start line and end line with the cursor, and input the slice thickness and slice interval. This procedure is as shown in the flowchart of FIG. In this way, the information necessary for the 31 scanning scans can be input, and as a result, as shown in Figure 4,
(2) A scanning 81-image table including information on the bed position, tilt angle, and slice thickness for each scan is created, and this table is recorded in the storage device 14 via the computer 13. When executing this series of scanning, the computer 13 reads the scanning plan table stored in the storage device 14,
Each scan is controlled so that scanning is performed as planned, and a series of scanning is automatically executed as planned.

Note that in the above configuration, the tilt angle, slice thickness, slice interval, etc. are input for a series of scanning of two or more slices, but the tilt angle, slice interval, etc.
It can also be configured to create a series of scanning plans by inputting slice thickness, slice interval, etc.

(to) The effect of this invention is X! According to the IaCT apparatus, it is possible to easily take a CT image with an appropriate slice thickness depending on the site, and it is possible to obtain a CT image with high diagnostic value. Also,
Patient throughput is also improved because complex scanning plans can be created without the need for tedious operations.

[Brief explanation of drawings]

Figure 1 is a block diagram of the embodiment, Figure 2 is a diagram for explaining an example of a scanning plan, Figure 3 is a flowchart for explaining the procedure for creating a scanning plan, and Figure 4 is an example of a scanning plan table. It is a diagram. l... Gantry 2... Tunnel section 3... Bed device 4... Patient 5... X-ray tube 6... Collimator 7... X-ray beam 8... X-ray detector 9 ...Control and data collection device 10...Image calculation device 11...Image display device 12
...Human power device 13...Computer 14...Storage device list 2 Minister 9th item

Claims (1)

[Claims] (1) A gantry in which an X-ray tube and an X-ray detector are disposed facing each other, a moving device for moving a subject into a space between the X-ray tube and the X-ray detector, and a moving device for moving an object into a space between the gantry and the moving device. A control device, the X-ray tube, and the X-ray detector reconstruct one tomographic image from data obtained by one scanning of the subject, and the moving device moves the subject to the X-ray tube and X-ray detection. an image calculation circuit that creates an X-ray transmission image from data obtained by moving it relative to the instrument; an image display device that displays the above-mentioned X-ray transmission image; An input device for inputting a series of scanning plans by inputting information including a scanning start position, an ζ position, an interval for each scan, and a slice thickness while moving a cursor, and storing the input series of scanning plans. An X-ray CT apparatus comprising a storage device and a central control device that reads out the stored scanning plan and executes a series of scans in accordance with the stored scanning plan.