JPS5988675A - Processing device for data of nuclear medicine - Google Patents

Abstract

PURPOSE:To make manual control unnecessary by varying the shading level of the image of a body to be diagnosed so as to be optimum in real time, based on parameters for displaying the image at the optimum shading level which is determined on the basis of the prescribed level of the gradation data in the data for diagnosis which is at a prescribed level. CONSTITUTION:A high-speed memory controller 3 reads out sequentially picture element data stored in a display memory 2, detecting the gradation data at the maximum level in the picture cells thereof and delivering them to an arithmetic device 4. When the maximum levels of the input gradation data are a1 and a2, for instance, the arithmetic device 4 determines specified level conversion tables f(a1) and f(a2) out of a number of level conversion tables stored, and delivers said tables f(a1) and f(a2) to a display controller 5. The display controller 5 converts the gradation data in the picture element data based on the level conversion tables input from the arithmetic device 4, and displays the image of a body to be diagnosed on the picture plane of a CRT monitor 6 at the optimum shading level and in real time.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a nuclear medicine data processing device.

[Technical background of the invention and its problems]

Conventionally, in a nuclear medicine data processing device such as an R1 diagnostic device, when displaying images on a CR1' monitor over time while collecting diagnostic data indicating the number of gamma rays from R1 and their positions over time, The operator had to frequently manually adjust the gray level on the monitor screen.
Due to the small number of lines, the image on the CRT monitor as a whole becomes pale, and in the later stages of diagnostic data collection, as the number of gamma rays obtained increases, the image on the aσ monitor as a whole becomes pale. This is because it becomes darker.

Therefore, in the conventional nuclear medicine data processing apparatus, the adjustment of the density level was extremely complicated, and the image on the CKT monitor was difficult to see. This was done in view of the current circumstances, and the aim is to provide a nuclear medicine data processing device that automatically adjusts the gray level on the CRT monitor when displaying images on the CRT monitor while collecting diagnostic data over time. This is the purpose.

[Summary of the invention]

The outline of the present invention for achieving the above object is to provide a memory for storing nuclear medicine diagnostic data collected over time with a scintillation camera, and to read out the nuclear medicine diagnostic data in the memory and calculate the R1 distribution in a subject. In a nuclear medicine data processing device that displays an image on a display means, nuclear medicine diagnostic data is read from the memory at predetermined time intervals, and the highest level of gradation data in the read nuclear medicine diagnostic data is detected at predetermined time intervals. level detection means; calculation means for determining a parameter to be converted into a predetermined gray level in the display on the display means according to the highest level detected by the level detection means; The present invention is characterized by comprising a level conversion means for converting gradation data in the nuclear medicine diagnostic data outputted from the memory into a predetermined gray level based on the above-mentioned memory.

[Embodiments of the invention]

An embodiment of the invention will be described with reference to the drawings.

As shown in Figure 1, 1 is a scintillation camera, which outputs an analog position signal containing the number and position of radiation emitted from an RI (radio isotope) within the subject, such as gamma rays. 1 is a display memory, which stores pixel data collected in real time obtained by digitally converting an analog position signal output from the scintillation camera 1 using an A/D converter (not shown). The pixel data includes the R1 distribution image of the subject detected by the scintillation camera 1, digital XY position data indicating the position of each pixel, and the number of γ-rays counted in that pixel, that is, digital gradation data. . Reference numeral 6 indicates a level detecting means, such as a high-speed memory controller, which reads out the image data stored in the display/f memory 2 for each pixel at predetermined time intervals, and detects the gradation level of the image data for each pixel read out. By comparing the data with each other, the highest level gradation data is detected and the highest level gradation data is outputted every predetermined frame time.

4 is an arithmetic unit, and based on the highest level gradation data output from the high-speed memory controller 3,
Parameters for displaying the subject image at the optimal gray level on the screen of the CRT monitor 6, which will be described later, are calculated and determined. For example, as shown in FIG. 2, the arithmetic unit 4 stores a large number of level conversion tables f(a) corresponding to the gradation levels, and selects a specific level conversion table from the highest level of input gradation data. Determine f(α) and output it. 5
Denoted by is a level conversion means, for example, a display controller, which reads image data from the display memory 2 in pixel order for each frame, and inputs a specific level conversion table f (cL), which is a parameter determined by the arithmetic unit 4. and its level conversion table f
According to (a), the gradation data of each pixel is converted to the gradation level of CRT monitor B. Reference numeral 6 denotes a CRT monitor, which determines the brightness of each pixel based on the gray level converted by the display controller 5, and displays the subject image for each frame.

Next, the operation of the above configuration will be described.

The display memory 2 collects and stores digitally converted pixel data output from the scintillation camera 1 in real time. The high-speed memory controller 6 sequentially reads out the pixel data stored in the display memory 2, detects the highest level gradation data in the pixel, and outputs the highest level gradation data to the arithmetic unit 4. If the highest level of the input gradation data is αl as shown in FIG. 2, the arithmetic unit 4 determines a specific level conversion table f(α1) among the many stored level conversion tables. and outputs fCα1) to the display control, -25. In this level conversion table f(α1), the highest level of gradation data is α
1, this is a parameter that displays the image of the subject on the screen of the CRT monitor B at the optimum gray level. Next, when the highest level of the gradation data detected and output by the high-speed memory controller 3 is α, as shown in FIG. is determined, and the table to be output is changed from the level conversion table f(α1) to the level conversion table f(α2
). On the other hand, the display controller 5
Pixel data is input sequentially from the display memory 2, and a level conversion table f (
The gradation data in the pixel data is converted by αj), and then the level conversion table -f(
The gradation data in the image data is converted by α2), and the subject image is displayed on the screen of the CRT monitor 6 in real time at the optimum gray level.

In this way, the highest level of gradation data is detected in real time, and the optimal gray level on the CRT monitor is automatically determined according to the highest level, so that the image is always easy to see from the early stages of collection to the later stages. during which the operator does not have to make any adjustments.

Although one embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and can be implemented with appropriate modifications within the scope of the gist of the invention. Needless to say.

〔Effect of the invention〕

According to this invention, when displaying a subject credit union while collecting diagnostic data indicating the number and position of radiation over time, tone data at a predetermined level in the diagnostic data collected in real time is detected. , determines the parameters for displaying the image at the optimal gray level based on the predetermined level of the gray scale data, and changes the gray level of the subject image to the optimal one in real time based on the parameters, thereby reducing the data collection period. It is possible to provide a nuclear medicine data processing device that can display an easy-to-see image of a subject on the central shrine and that does not require manual adjustment by an operator.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing a table for converting gradation data to an optimum gray level on a monitor. DESCRIPTION OF SYMBOLS 1... Scintillation camera, 2... Memory C display memory), 6... Level detection means (high-speed memory controller), 4... Arithmetic means (arithmetic device), 5... Level conversion means (display controller), 6...display means (CRT monitor)
. 1 Suga Namo De-ichita

Claims (1)

[Claims] A memory for storing nuclear medicine diagnostic data collected over time by a scintillation camera, and a nuclear medicine data processing device for reading out the nuclear medicine diagnostic data in the memory and displaying an R1 distribution image in a subject on a display means. , novel detection means for reading nuclear medicine diagnostic data from the memory at predetermined time intervals and detecting the highest level of gradation data in the read nuclear medicine diagnostic data at predetermined time intervals; calculation means for determining a parameter to be converted into a predetermined gray level in the display on the display means according to the level; and nuclear medicine diagnostic data output from the memory based on the parameters determined over time by the calculation means. 1. A nuclear medicine data processing device comprising: level conversion means for converting gradation data into a predetermined gray level.