JPS6268438A - 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] [Technical Field of the Invention] The present invention includes a radiation source and a detector disposed facing the radiation source with a subject in between, A scano-image-based OCT device (Computed Tomograph
y 5canner).

[Technical background of the invention and its problems]

Generally, in order to obtain the best contrast of a CT image using this type of CT apparatus, first, as shown in FIG.
is confirmed, positioning is performed centering on the region 2, and the number of slices and tilt angle are set, and a scan plan is previously set using the scan plan creation device 3 shown in FIG. Next, based on the scan plan, a scan is performed as is well known, and projection data regarding absorption of transmitted radiation obtained from a detector (not shown) is collected by the projection data acquisition device 4. Thereafter, the data processing device 5 reconstructs the collected data to create a CT image.

By the way, in this type of CT apparatus, the tilt angle θ is limited due to the structure of the data acquisition device 4 with respect to the bed 6 as shown in FIG.
is limited, and it is virtually impossible to collect data other than the shaded area 7 in FIG. For this reason, the scan plan becomes very limited, causing diagnostic inconveniences. Furthermore, since FIG. 3 constitutes a series of acquisition and reconstruction systems, it has the aspect that other processing, such as image data processing, cannot be performed.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an OCT apparatus using scanograms that eliminates restrictions on the tilt angle of a data acquisition device and allows free creation of scan plans.

[Summary of the invention]

The outline of the present invention for achieving the above object includes a radiation source and a detector disposed opposite to the radiation source with a subject in between, and the present invention is based on a scan plan set in advance using a scano image. In a CT apparatus that constructs a tomographic image using projection data related to transmitted radiation absorption obtained from the detector, scan plans in limited angular directions and MPR plans other than the actual projection angle are created using scano images. means for setting a synthesized composite scan plan; means for processing projection data sent from the detector to obtain image data based on the scan plan of the composite scan plan; and means for obtaining image data from the image data based on the MPR plan. The present invention is characterized in that it has a means for obtaining image data for MPR, and reconstructs an image corresponding to a composite scan plan using the image data and the image data for MPR.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIG.

The device shown in Figure 1 consists of a scan plan subject to tilt 1-angle limitations and an arbitrary angle M that is not subject to tilt angle limitations.
P R (Muti Planer Reconstruct)
a composite scan plan creation device 11 that creates a composite scan plan consisting of a composite scan plan creation device 11; and a plan discrimination device 12 that takes in the composite scan plan created by the composite scan plan creation device 11 and distinguishes between the scan plan and the MPR plan. , a projection data collection device 13 that takes in the scan plan differentiated by the plan discrimination device 12 and collects projection data based on the scan plan, and a data processing device that takes in the collected projection data and processes it and sends it out as image data. 14, data collection for MPR that takes in the image data, collects MPR data from this image data, sends it out, and sends out other image data to an image data recording device and an image display device (not shown). Based on the MPR plan sent from the plan distinguishing device 12, an image data recording device (not shown) and an image data recording device (not shown) take in MPR data from the MPR data collection device 15 and process it as image data for MPR. MPR processing device 1 sending to display device
6.

Next, the operation of the apparatus of the above embodiment will be explained.

First, the synthetic plan creation device 11 generates a free synthetic scan plan that is not subject to tilt angle restrictions and is created by combining a scano plan in a limited angular direction using a scano image and an MPR plan other than the actual projection angle. Set in advance. Next, the plan distinguishing device 12 distinguishes the composite scan plan into a scan plan and an MPR plan, and the scan plan is input to the projection data acquisition device 13, and the MPR
Each plan is input to the MPR processing device 16.

Next, the projection data collection device 13 collects scan data based on the scan plan, and the collected projection data is input to the data processing device 14 for reconstruction processing. Furthermore, before outputting the image created by the data processing device 14 to an image recording device and an image display device, MPR data is collected by an MPR data collection device 15,
The collected MPR data is reconstructed by the MF)R processing device 16 based on the MPR plan, and image data is sent from the data processing device 14 via the MPR data collection device 15, and the MPR processing device. Using the image data obtained in step 16 and the image data recognized to be substantially based on the synthesis plan, a free tomographic image not limited by the tilt angle is obtained. In this case, in order to create projection data for MPR based on the projection data of the scan plan, for example, the projection data for MPR may be obtained by performing calculation processing using the Fourier transform method based on the projection data of the scan plan.

In this way, the present invention can create a free synthetic scan plan that is not limited by tilt angles using an MPR plan, and can obtain tomographic images from any angle. Further, by incorporating MPR processing into the acquisition/reconstruction system, it is possible to speed up the MPR processing.

Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

S Effects of the Invention] The present invention enables the creation of a free scan plan that is not limited by the tilt angle by combining a scan plan and an MPR plan, and has an advantageous effect in terms of diagnosis.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a schematic explanatory diagram of a scan plan, Fig. 3 is a block diagram of a conventional device, Fig. 4 is a schematic explanatory diagram showing restrictions on tilt angle, and Fig. 5 The figure is an explanatory diagram showing a scan area based on tilt angle restrictions. DESCRIPTION OF SYMBOLS 11... Synthetic scan plan creation device, 12... Plan discrimination device, 13... Projection data collection device, 14... Data processing device, 15... Data collection device for MPR, 16... MPR Processing equipment. Agent Patent Attorney Nori Ken Yudo Ogo Norio Ogo Figure 2 Figure 3 j 4 5 Figure 4 θ 5 PJs Figure

Claims (1)

[Claims] projection data regarding absorption of transmitted radiation obtained from the detector based on a scan plan set in advance using a scano image, comprising a radiation source and a detector disposed opposite to the radiation source with a subject in between; A means for setting a composite scan plan that combines a scan plan in a limited angular direction and an MPR plan other than the actual projection angle using a scano image, in a CT apparatus configured to construct a tomographic image by using a scano image; comprising means for processing projection data sent from the detector to obtain image data based on a scan plan of a scan plan, and means for obtaining image data for MPR from the image data based on the MPR plan, A CT apparatus characterized in that an image corresponding to a composite scan plan is reconstructed using the image data and MPR image data.