JPH0438938A - Image reconstruction - Google Patents

Abstract

PURPOSE:To obtain an image with a larger reconstruction matrix at a lower cost by synthesizing and reconstructing a total image on a display memory, after an image is reconstructed partially on an image memory. CONSTITUTION:An image data of a patient photographed with an X-ray CT device or the like is collected and a part thereof, for example, a 1/4 image is reconstructed with a matrix of 512 lines x 512 columns in pixel on an image memory 10 within an image reconstructing device. Four images reconstructed in terms of parts are synthesized and reconstructed to a total image on a display memory 20 of a main memory or a frame memory, with a matrix of 1024 lines x 1024 columns in pixel, by controlling an address of the memory to be projected onto a display monitor of a CRT or the like. Thus, an image with a larger image matrix is obtained with a limited capacity of the image memory, thereby enabling the obtaining of a high performance reconstructing device at a lower cost without need for a large capacity of image memories.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for reconstructing images for medical diagnosis taken by an X-ray CT device or the like.

(Prior Art) In recent years, as the performance of X19CT devices and the like has improved, larger image reconstruction matrices have been required in order to improve the clarity of images.

In conventional image reconstruction methods, images are reconstructed using an image memory whose capacity corresponds to the size of an image reconstruction matrix.

(Problems to be Solved by the Invention) However, the conventional image reconstruction method described above requires an image memory with a larger capacity corresponding to the image matrix, resulting in a problem of high cost.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an image reconstruction method that can obtain an image of a larger reconstruction matrix at low cost.

[Structure of the Invention] (Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention includes a step of collecting image data of a patient from a medical image diagnostic apparatus, and a portion of the collected image data. The method includes the steps of reconstructing the images on an image memory in an image reconstruction device, and synthesizing and reconstructing the reconstructed partial images on a display memory.

Alternatively, a step of collecting image data of a patient from a medical image diagnostic device, and a step of reconstructing the collected image data into an image memory in an image reconstruction device using a rough pixel matrix; This method includes the step of synthesizing and reconstructing an image composed of a rough pixel matrix with a fine pixel matrix on a display memory.

(Operation) In the present invention, after partially reconstructing an image on the image memory, the whole image is synthesized and reconstructed on the display memory, or the whole image of a rough pixel matrix is reconstructed on the image memory in advance. , and then performs composite reconstruction using a fine pixel matrix on the display memory, so an image with a larger image matrix can be obtained using the limited capacity of the image memory.

(Example) Examples related to the image reconstruction method of the present invention are shown in FIGS. 1 to 4.
This will be explained based on the diagram.

That is, FIG. 1 is a flowchart of the image reconstruction method in the first embodiment. In this embodiment, first, in step S1), an image of a patient photographed by an XIICT device or the like is collected, and this image is stored in an image memory 1 in an image reconstruction device.
0 on a part, e.g. 1/4 image, 512 rows of pixels,
Reconstruction is performed using a matrix of 512 columns (step S2).

Next, the four images reconstructed for each part are
By controlling the memory address, the entire image is synthesized and reconstructed on the display memory 20 of the main memory or frame memory of the matrix of 024 rows and 1024 columns (Step S3), and this is displayed on a display monitor such as a CRT. (Step S4).

Moreover, FIG. 3 is a flowchart of the image reconstruction method in the second embodiment. According to this embodiment, first, image data of a patient photographed by an X@CT device or the like is collected (step S5), and this data is stored in the image memory 30 in the image reconstruction device in a row of 512 pixels, for example, 512 rows, 512 The overall image is reconstructed using a matrix of columns (step S6).

Thereafter, for example, writing/reading is performed for every 4 addresses of the memory, and fine pixels, that is, 1024 rows, are written on the display memory 40 of the main memory or frame memory.
The entire image is synthesized and reconstructed using a matrix of 1024 columns (step S7), and displayed on a display monitor such as a CRT (step S8).

Thus, in the first and second embodiments, a reconstructed image of a large image matrix can be obtained even with an image memory having a limited capacity of the image matrix.

[Effects of the Invention] As explained above, according to the present invention, an image is partially reconstructed on the image memory, and the partial images are combined and reconstructed into the whole image on the display memory, or rough pixels are reconstructed on the image memory. Reconstruct the whole picture using the matrix of
After that, the entire image is synthesized and reconstructed using a matrix of fine pixels on the display memory, so even an image memory that only has a small pixel matrix can reconstruct an image with a large pixel matrix. Therefore, a clear image with a large pixel matrix can be obtained without requiring a large capacity image memory in the reconstruction device. Therefore, the above-mentioned problems can be solved by providing a high-performance reconstruction device at low cost.

[Brief explanation of the drawing]

1 to 4 show an embodiment related to the image reconstruction method of the present invention, FIG. 1 is a flowchart in the first embodiment, FIG. 2 is a first explanatory diagram of image reconstruction, and FIG. is the second
The flowchart in the embodiment, FIG. 4 is a second explanatory diagram of image reconstruction.・・Image memory 20°40・Display memory

Claims (2)

[Claims] (1) A step of collecting image data of a patient from a medical image diagnostic device; A step of reconstructing an image of a portion of the collected image data on an image memory in an image reconstruction device; An image reconstruction method comprising the step of synthesizing and reconstructing the obtained partial images on a display memory. (2) a step of collecting image data of a patient from a medical image diagnostic device; and a step of reconstructing an image of the collected image data on an image memory in an image reconstruction device using a rough pixel matrix; An image reconstruction method comprising the step of synthesizing and reconstructing the image composed of the rough pixel matrix on a display memory using a fine pixel matrix.