JPS58125171A - Picture display - Google Patents

Abstract

PURPOSE:To lighten the burden of software, by providing plural filter functions, also constituting so that a position and size of an interested area in a display picture changable and performing optional filtering to only the interested area. CONSTITUTION:When an interested area selecting part 5 is operated, a mark signal S2 is outputted from a mark signal generator 5D, is superposed on a picture of the picture of an indicator 19, and a mark is displayed. In this state, the mark displayed on the picture is set to optional position and size by operating setting devices 5A-5C. In case when filtering is executed, a filter function setting device 6A is operated. In accordance with this operation, output states of 2 AND gates G1, G2 are varied, an up-down counter 6C is operated, and by its output S4, a prescribed address in the second memory 6D is designated, and a signal S3 corresponding to a stored filter function is read out. In this way, a degree of filtering in the interested area mark is set to a desired state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention particularly relates to reconstruction ii! The present invention relates to an image display device that performs filtering (1li1i of spatial frequency components) on Ii image data and displays the filtered data.

[Background technology and its problems]

Known xm computed tomography device (hereinafter referred to as x-ray CT)
The method uses a combiator to process the X-ray transmission data of the subject, creates reconstructed image data, and displays a tomographic image based on this data. In many cases, filtering is applied to obtain images with properties favorable for clinical purposes.In other words, depending on the difference in the imaged area or what kind of information from the reconstructed image is to be obtained by visual inspection, A better request arises by changing the spatial frequency characteristics of the reconstructed image. Generally speaking, if you emphasize high spatial frequencies, the contrast of the image will increase! DI! i*
On the other hand, vibrating arch7 acts occur in areas with strong contrast, and high-frequency noise increases throughout the screen. Conversely, if high spatial frequencies are suppressed, the contrast of the image will be evenly improved as a whole.

As a result, although it is not suitable for observing changes in the image, high-frequency noise is suppressed and the image becomes easy to see. The process of emphasizing and suppressing geography that emphasizes high spatial frequencies is called smoothing.Methods for achieving this process include performing a spatial filter operation on the reconstructed image;
There is a method of selecting a filter function to be used during reconstruction.

However, among the above methods, the method that performs spatial filter calculations processes the entire image, so even if you only want to process a specific area within the image, you must perform calculations on all information. MIIK
There are problems in that it takes time and the arithmetic circuits etc. become complicated and large. Furthermore, the method of selecting a filter function to be used during reconstruction has the problem that the rounding processing time is further increased since all processing is performed based on a computer program.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an image display device that has a simple configuration and is capable of increasing the speed of filtering.

A ninth aspect of the present invention to achieve the above object is to provide the device itself with a plurality of filter functions and a means for selecting a region of interest in a displayed image, thereby making it possible to select a region of interest at any position and size. [Embodiment of the Invention] FIG. 1 is a block diagram showing an embodiment of the apparatus of the present invention. In the figure, reference numeral 1 denotes a first storage device (first memory) in which reconstructed image data that has been converted into a matrix is stored, and writing and reading are controlled by a controller 2. There is. 3 is the two output terminals A and B
Normally, the first memory 1 outputs the output data S1 which is read out sequentially from the terminal A, and if the C8tχ gate is applied, the data is switched to the B terminal side during that period. This is the ninth switching gate circuit for outputting (Sr)), and the gate is controlled by a mark signal SmK from a mark signal generator in a region of interest selection section, which will be described later. The region of interest selection unit 5 is for selecting an arbitrary region of interest within the display screen, and includes a region of interest position setting device 5A.
, a region of interest X (direction) size setter 5B, a region of interest Y (direction) size setter 5C, and a mark signal S! corresponding to the region of interest set by each of these setters. It is composed of mark signal generators 5D and 5K that generate . Reference numeral 4 denotes a filter calculation unit that calculates (for example, multiplies) and outputs the Tagata data Be on the switching gate circuit 30B terminal side and a signal (information) Sm corresponding to a filter function output from a filter function selection section whose details will be described later. It is. The filter function selection section 6 includes a filter function setter 6A, a signal generator 6B that generates a four-way signal for counting, and two ant games that gate the outputs of the filter function setter 6A and the signal generator 6B. The outputs of G+, Gfu, and Antgame) Gs and G鵞 are respectively supplied to the up terminal) and the down terminal ■, and the up-down color/re 6C and data corresponding to a plurality of filter functions are stored in advance at the address. a second storage device (a second memory, for example, a read-only memory ROM) 6D, in which readout addresses are selected based on the count output 84 from the up-down counter 6C; The filter function setter 6m has a selection function that refers to the current count value of the up/down counter 6C and selects and outputs either the up side output U or the down side output in relation to the set value. There is. Therefore, if the contents of the filter function setter 6m are set according to the order of the numerical values of the filter functions stored in the second memory 6DFQK, the up/down counter 6C will have a ripple corresponding to the set number. This means that the data in the second memory 6D is selected. 7 is a mixer that mixes and outputs the output Ss of the filter calculator 4, the mark signal Sl from the mark signal generator 5D, and the terminal side output 81' of the switching gate circuit 60A; A D/A converter converts the output to an analog signal,
Reference numeral 9 denotes a display device that displays an image based on the converted analog signal. Note that the stripe 1 memory 2. Both the mark signal generator 5D and the display 9 are synchronized by the clock signal from the synchronous clock generator 10. In the case of normal image display, the operation of the device according to the embodiment will be explained with reference to the display screen pattern shown in FIG. The reconstructed image data in the first memory 1 is sequentially read out and displayed on the screen 11 of the display 9 via the A terminal side of the switching game 13, the mixer 7, and the D/A converter 8. is displayed (see Figure 2).

When a region of interest is set by operating the region of interest selection unit 5, a mark signal S! is generated from the mark signal generator 5D. is outputted and superimposed on the image 12 on the screen 11 of the display 9 via the mixer 7 and the D/A converter 8 and displayed as a mark 13 (see FIG. 2). In this state, the region of interest selection section The mark 13 displayed on the image 12 is set to an arbitrary position and size by operating each of the setting devices 5A to 5C in the image 12.

If you want to perform filtering next time, just use a filter. Before proceeding to this operation, a signal based on a previously set film function is read out from the second memory 6D in synchronization with the generation of the mark signal S-, and this readout signal Sm
and the switching gate circuit 30B terminal side output Sr are multiplied by the filter calculator 4, and the multiplication result signal S$ is Miki? -7, so within the region of interest mark 15 displayed on both screens 11 of the display 90 (Fig. 2/1)
The image of the cutting area wtY) has already been filtered. Therefore, when the filter function setting device 6m is operated while observing the degree of filtering within the region of interest mark 13 by visually viewing the display screen, the two AND gates G1. The output state of Gl changes, and the up/down counter 6C operates according to this state WAK.
A predetermined address in the second memory 6D is designated by the count output signal 84, and a signal Ss corresponding to the filter function stored in the designated address is read out. The side output Bf is multiplied by the filter calculator 4 and input to the mixer 7.

As a result, the degree of filtering within the region of interest mark 13 on the display screen 11 changes.

Similarly, when the filter function setting device 6At is operated, the degree of filtering within the region of interest mark 13 displayed on the screen is set by K to a desired state.

The present invention is not limited to the embodiments described above, and various modifications can be made. For example, in the embodiment described above, when the region of interest selection section 6 is operated to display a region of interest mark on the screen, the second section that outputs a signal corresponding to the filter function at the same time
Although the memory 6D and the filter calculator 4 are operated to immediately perform filtering, the filter function selection section 6 is provided with a starting means, and when the starting means is not operated, the numerical values are always read from the second memo 176D. A signal corresponding to "1" K may be output, and the filter calculator 4 may input the input signal Sr as it is to the mixer 7, so that only the region of interest mark is displayed alone.
The specific configurations of the filter function selection section 6 and the region of interest selection section 5 are not limited to the embodiments described above.

〔Effect of the invention〕

As described above in detail, the present invention partially selects and specifies only the diagnostic vcIib* area and applies desired filtering to only that part, so it is different from applying filtering to the entire image as in the conventional method. It is possible to provide an image display device that can speed up the processing compared to the above, has a simplified circuit configuration because only partial processing is required, and has excellent operability.

In addition, it is possible to clinically mark a lesion as a region of interest, perform enhancement or smoothing processing, and observe it without affecting the surrounding image quality. It goes without saying that this method can significantly reduce the burden on the computer compared to a method in which filtering is included in the computer's program.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the device of the present invention, and FIG.
The figure is a display image mode diagram for explaining the operation. 1... Storage device, 4... Arithmetic means, 5...
Region of interest selection unit, 6...Filter function selection unit, 9
...Display device〇

Claims (1)

[Claims] An apparatus for storing reconstructed image information and sequentially reading information from a storage device to display an image, comprising a region of interest selection section for displaying an arbitrary region of interest mark on a displayed image, and a plurality of filter functions. a filter M number selection section capable of selecting an arbitrary filter function; and 'tan means for performing an operation between information in the friend 'fA region selected by the region of interest selection section and filter function information selected by the filter function selection section. An image display device that is patented in that it provides filtering 'f within one displayed heart region.