JPH0698126B2 - Display data processing device - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a display data processing device for performing pseudo-stereoscopic display based on projection data obtained from a data collection unit.

[Technical Background of the Invention and Problems Thereof] A technique for stereoscopic display based on tomographic image data obtained by a computer tomography device such as a radiation (X-ray) CT device or a magnetic resonance imaging device (MRI device) is a subject. This is a technique that has a great effect in grasping the shape and the like inside the patient.

By the way, the conventional stereoscopic display is performed as follows.

First, a plurality of slices are reconstructed based on projection data collected from a plurality of rotation angles for each of a plurality of slices in the body axis direction of the subject, and the contour of the body surface is extracted from the reconstructed tomographic image. Next, a surface image is created based on the extracted contours, and the created surface image and the tomographic image are combined to perform stereoscopic display.

However, the above-mentioned stereoscopic display has a problem that a large scale of hardware is required because a large amount of calculation is required, and it takes a long time from the collection of projection data to the stereoscopic display.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object thereof is to provide a display data processing device capable of performing pseudo-stereoscopic display at high speed by a small-scale hardware.

[Outline of the Invention] An outline of the present invention for achieving the above object is to provide a display data processing device that performs pseudo-stereoscopic display based on projection data for a plurality of slices at a plurality of rotation angles obtained from a data collection unit. Image storage means capable of storing projection data, and when storing in the image storage means, address control is performed so that projection data for a plurality of slices are identified and stored for each rotation angle, and read from the image storage means. At this time, the projection data for the plurality of slices is displayed for each rotation angle, and the address control means for performing address control so that the rotation angles are sequentially switched and read, and the image read by the control of the address control means are displayed. And a display means.

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

FIG. 1 is a schematic block diagram showing the configuration of a display data processing device which is an embodiment of the present invention. The display data processing device shown in FIG. 1a includes an image storage means 2 for storing projection data transferred from a computer tomography device 1b, which is a data collection unit, and an address for writing and reading the image storage means 2. In the projection data in the image storage unit 2 under the control of the address control unit 3 for controlling, and in detail as will be described later, the same rotation angle data regarding a plurality of slices is taken as one captured image for each rotation angle. And a display means 4 capable of sequentially switching display.

Next, the operation of the embodiment apparatus having the above configuration will be described.

The projection data stored in the image storage means 2 is collected by the computer tomography apparatus 1b as follows.

For example, the computer tomography device 1b is a third generation CT using X-rays.
In the case of a scanner device, as shown in FIG. 2, X-rays are emitted toward an object 8 from an X-ray source 7 that can rotate once (360 °) in the direction of arrow 6 together with a detector 5. The exposed X-rays are detected by the detector 5 after passing through the subject 8.
When data collection for one rotation for one slice of the subject 8 is completed, the gantry 7a having the detector 5 and the X-ray source 7 is moved in the body axis direction of the subject 8 (arrow 9 as shown in FIG. 3). Direction) for one slice, and the data of one rotation is collected again. In this way, projection data for all slices is obtained in the body axis direction of the subject 8.

The address control when the projection data is stored in the image storage means 2 is performed by the address control means 3. The address control of the image storage means 2 by the address control means 3 will be described below with reference to FIG.

FIG. 4 is an explanatory diagram for explaining the address control by the address control means 3.

One-dimensional data Xθi, where the slice number is j, the X-ray exposure angle (also simply referred to as “angle”) θi, is stored at address (i, j). That is, the data for all the slices at the same angle are stored in the areas (θ ₀ , θ ₁ , ..., θi) corresponding to one projection image of the display unit 4.

Next, the address control when reading the projection data in the image storage means 2 is performed again by the address control means 3. That is, the projection data θ ₀ , θ ₁ , ..., θi in the image storage means 2 are sequentially read out for each note of the one projected image constituent of the image display means 4. For example, first, the data regarding θ ₀ is Xθ ₀ (i, 0), Xθ ₀
(I, 1), ..., Xθ ₀ (i, j), ... Are read in this order, and one projection image of the display means 4 is constructed by this. Similarly, the data regarding θ _{1 and the} data regarding θ i are sequentially read out to form one projection image of the display means 4, respectively.

In this way, when the data from the same rotation angle in a plurality of slices in the projection data in the image storage means 2 are sequentially switched and displayed as one projection image, for example, as shown in FIG. Is an image display in which the rotation is changed little by little, which enables pseudo three-dimensional display. Further, in this pseudo three-dimensional display, since the image reconstruction and the calculation processing such as the contour extraction of the body surface from the reconstructed image are not required, the hardware scale is reduced and the stereoscopic display is performed after the projection data is transferred. It takes less time than before.

The present invention is not limited to the above embodiment.

For example, the embodiment shown in FIG. 1 may be configured by including a data interpolating unit that interpolates data between each slice in the projection data. With this configuration, the image quality of the display image shown in FIG. 5 in the vertical direction, that is, in the body axis direction of the subject is improved.

Further, the computer tomography apparatus 1b may be provided with a fan parallel conversion unit that converts data collected by fan-shaped X-ray irradiation into parallel data. With such a configuration, information such as organs can be accurately obtained.

In addition, the computer tomography apparatus 1b is a fourth generation X-ray
A so-called magnetic resonance imaging apparatus (MRI apparatus) using a CT scanner device (only the X-ray source 7 rotates around the subject 8 and the detector 5 does not rotate) or utilizing the magnetic resonance phenomenon.
And so on.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a display data processing device capable of performing pseudo-stereoscopic display at high speed by small-scale hardware.

[Brief description of drawings]

FIG. 1 is a schematic block diagram showing the configuration of a display data processing apparatus which is an embodiment of the present invention, and FIGS. 2 and 3 are X-ray CT.
FIG. 4 is an explanatory view for explaining collection of projection data by the scanner device, FIG. 4 is an explanatory view for explaining address control in the embodiment device shown in FIG. 1, and FIG. 5 is an image of the device shown in FIG. It is an explanatory view for explaining a display. 1a ... Display data processing device, 1b ... Computer tomography device (data collecting unit), 2 ... Image storage means, 3 ... Address control means, 4 ... Display means.

Claims (3)

[Claims] 1. A display data processing apparatus for performing pseudo-stereoscopic display based on projection data for a plurality of slices at a plurality of rotation angles obtained from a data collection unit, and image storage means capable of storing the projection data, and this image. When storing in the storage means, the projection data for a plurality of slices is address-controlled so as to be identified and stored for each rotation angle, and when reading out from the image storage means, the projection data for a plurality of slices is rotated for each rotation. Address control means for performing address control for each angle and sequentially switching and reading this rotation angle;
A display data processing device comprising: a display unit for displaying an image read by the control of the address control unit. 2. The display data processing device according to claim 1, wherein the data collecting unit is a computer tomography device. 3. The computer tomography device is a fan-shaped X-ray
The display data processing device according to claim 2, further comprising: a fan-parallel converter that irradiates a line to collect data and converts the collected data into parallel data.