JPS63245566A - Picture data processor - Google Patents

Abstract

PURPOSE:To reduce necessary memory capacity by making the succeeding scanning available even if the processing of raw data obtained by an optional scanning is not completed yet and utilizing a storage device inherent in an arithmetic unit to be controlled by a CPU. CONSTITUTION:Scanning S1 is executed, raw data D1 is sent to a 1st buffer memory 7 in a raw data buffer memory 6, and at the time of turning on a switch 8, sent to a 2nd buffer memory 9. The data D1 in the memory 7 are stored in a magnetic disk 5 through the CPU3 and picture constituting operation R is executed in a rapid arithmetic unit 1 through a general bus 10. Since the unit 1 is executing operation at the time of starting scanning S2, the switch 8 is turned off and input data D2 are stored from the memory 7 to a magnetic disk 5. After completing the operation R1 of the unit 1, the CPU3 stores the data D2 from a disk 5 to the memory 9 and the unit 1 starts the operation R2 of the data D2. Thus, the buffer memory is divided into two areas to simultaneously execute the entry of the raw data into the magnetic disk and the picture reconstitution of the arithmetic unit 1.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a high-speed arithmetic device that performs an image reconstruction operation via a storage means that stores raw data for image reconstruction using a direct memory access method, and a CPLI that The present invention relates to an image data processing apparatus having a storage means for pulling up and storing image reconstruction calculation data stored in the storage means.

(Prior Art) Conventionally, in an X-ray WJ imaging system (hereinafter referred to as a CT system), raw data that has been multiplied by an X-ray detector and converted into a digital signal is processed as shown in Figure 3. was. In the figure, reference numeral 1 denotes a high-speed calculation device that performs image reconstruction processing by calculating raw data, and has a built-in main data memory 2. The raw data collected by the scan of the CT device is temporarily stored in the main data memory 2 using a direct memory access (DMA) method for image reconstruction, and is then subjected to arithmetic processing in the high-speed arithmetic unit 1 to perform image reconstruction. I was worried. Raw data after image reconstruction processing is CP
It was read by the CPLI 3 via the U-bus 4, and then pulled up to a storage device 5 such as a magnetic disk.

(Problem to be solved by the invention) When processing data using the above method, the raw data obtained in one scan in a CT device, high-speed arithmetic
2, the data must be stored in the main data memory 2 until the image reconstruction is completed and taken up to the magnetic disk 5. Data collection by the next scan is performed by the high-speed arithmetic unit 1 after the previous data collection. It is necessary to wait for the completion of the process of calculating and reconstructing the image and storing it on the magnetic disk 5. In order to shorten this time, it is possible to increase the storage capacity of the main data memory 2 so that it can store raw data for several scans, but the raw data obtained in one scan is huge. Therefore, in order to realize this, the main data memory 2 needs to be increased by a huge amount.

The present invention has been made in view of the above points, and its purpose is to enable the next scan even if the processing of raw data obtained in a certain scan is not completed, and to The object of the present invention is to realize an image data processing device that can reduce the required memory M by skillfully utilizing a storage device.

(Means for Solving the Problems) The present invention, which solves the above-mentioned problems, is a high-speed processor that performs image reconstruction calculations via a storage means that stores raw data for image reconstruction using a direct memory access method. i device and CPU
In the image data processing apparatus, the image data processing apparatus has storage means for pulling up and storing the image data stored in the storage means, in which raw data for image reconstruction is directly stored in the memory instead of the storage means for storing by the direct memory access method. a first buffer storage means for storing data according to an access method; a switching means that is turned on and off depending on whether or not the high-speed calculation means performs an image reconstruction operation; and a first aS through the switching means.
The present invention is characterized in that it includes second buffer storage means for storing raw data for image reconstruction together with storage means for image reconstruction by a direct memory access method.

(Function) The image reconstruction calculation data is stored in the first buffer storage means by direct memo and re-access method, and when the image reconstruction calculation is not being performed, the switching means is turned on and the data is stored in the second buffer storage means. When the image reconstruction operation is started, the switching means is turned off, and the raw data that arrives during the execution of the operation is stored in the first m-cylinder storage means, and the CPU
The data is retrieved and stored in the storage means via the second buffer storage means, and image reconstruction calculations are performed using the data in the second buffer storage means.

(*Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

In the figure, the same parts as in FIG. 3 are given the same reference numerals. In the figure, reference numeral 6 denotes a raw data buffer memory that stores the collected raw data using a direct memory access method. and a second buffer memory 9 into which raw data is written.

Further, the second buffer memory 9 exchanges data with the magnetic disk 5 while the switch 8 is off. 1° is a high-speed arithmetic unit general-purpose bus that is connected to the second buffer memory 9 and sends data to the high-speed arithmetic unit W11.

Next, the operation of the embodiment configured as described above will be explained with reference to the time chart of FIG.

In FIG. 2, (a) is the scanning timing of the CT apparatus, which is represented by 5(i), and the number in parentheses indicates the number of scans. (b) is the on-off timing of the switch 8, (c) is the timing of data writing and data retention by scanning to the first buffer memory 7,
D(i) indicates data collected in the i-th scan.

(d) is the timing when the CPU 3 writes the data stored in the first buffer memory 7 to the magnetic disk 5 via the CPU bus 4, and the data is held in the magnetic disk 5. (E) is the timing at which data is written to the second batho memory 9 and the data is held.

When the switch 8 is on, raw scan data is directly written, and when the switch 8 is off, the scan data stored on the magnetic disk 5 is written.

(f) is the timing at which the high-speed arithmetic unit 1 performs image reconstruction X, and R(i) represents the execution of the image reconstruction operation to process the data D(1) collected in the i-th scan.

The operation of each part at each period will be explained below. The timing of the operation is shown in FIG.

a, the first scan 5(1) is executed and data D(1
) are collected. The collected raw data D(1) is written into the first buffer 1 memory 7 using a direct memory access method. At this time, the switch 8 is turned on, and data D(1) exactly the same as that in the first buffer memory 7 is simultaneously written into the second buffer memory 9. The CPU 3 converts the data D(1) stored in the first buffer 7 memory 7 to CPJ.
It is read via the bus 4 and stored on the magnetic disk 5. At the same time, data D(1) in the second buffer memory 9 is taken into the high-speed arithmetic unit 1 via the high-speed arithmetic unit general-purpose bus 10, and image reconstruction operation R(1) is executed.

b. Second scan 5(2) is started. At this point, the high-speed arithmetic unit 1 is still using the image reconstruction wave IR of D(1).
Since (1) is being executed, switch 8 is turned off,
The collected data D(2) is stored only in the first buffer memory 7, and the CPU 3 stores it in the first buffer memory 7. Data D in memory 7
(2) is stored on the magnetic disk 5.

c, data D (1
) image reconstruction calculation R(1) is completed.

CPIJ3 is data D stored in the magnetic disk 5
(2) is written to the second buffer 7 memory 9 via the CPLJ bus 4. The high-speed processing unit @1 starts image reconstruction calculation R(2) for D(2).

6. Execute the third scan 5(3). Since the high-speed calculation device 1 is executing the image reconstruction calculation R(2), the switch 8 remains off. The raw data is taken only into the first buffer memory 7 and stored on the magnetic disk 5 by the CPtJ3.

e, the image reconstruction calculation R<2) of the high-speed calculation device 1 is completed, and the CPU 3 reads the data D written on the magnetic disk 5.
<3) to the second buffer memory 9 via the CPU bus 4.
, and the high-speed calculation device 1 performs image reconstruction calculation R(3>
Start.

[, Image reconstruction calculation R(3) of the high-speed calculation device 1 ends. In this case, there is a margin between FRs until the end of scan 5(3) and the start of the next scan.

9. Start scan 5 (4). Already high-speed calculation device 1
Now, since the image reconstruction calculation R(3) has been completed, the switch 8 is turned on and the collected data D(4) is
The data is simultaneously written into the buffer memory 7 and the second buffer memory 9 using a direct memory access method. The CPU 3 converts the data D(4) stored in the first buffer memory 7 into the CP
The high-speed arithmetic unit 1 starts to write the data to the magnetic disk 5 via the U bus 4, and the high-speed arithmetic unit 1 transfers the data D(
4) and execute the image reconstruction wave IR(4). Thereafter, the process from data collection to image reconstruction is executed in the same manner as described above.

As described above, according to this embodiment, by dividing the buffer memory into two areas, the pulling of raw data onto the magnetic disk and the image reconstruction processing by the high-speed arithmetic unit can be performed simultaneously and without interfering with each other. can.

Furthermore, the next scan can be executed even if the processing of data obtained in the previous scan is not completed by turning the switch on or off. Therefore, it has become possible to perform continuous scanning, which is useful for improving inspection throughput.

Note that the present invention is not limited to the above embodiments. That is, if the second buffer 1 memory is multi-boarded, parallel processing by a plurality of high-speed arithmetic units becomes possible.

Furthermore, it can be applied not only to CT devices but also to any system that processes collected data.

Although a magnetic disk is used as an example of the storage device, various other storage devices can be used.

(Effects of the Invention) As described above in detail, according to the present invention, the 1?? can be accessed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a time chart of various parts in this embodiment, and FIG. 3 is a block diagram of a conventional device. 1... High-speed performance device 2... Main data memory 3... CPLJ 4... CPLJ bus 5
...Magnetic disk 6...Raw data buffer memory 7...First buffer memory 8...Switch 9...Second buffer memory 7

Claims (1)

[Claims] A high-speed calculation device that performs image reconstruction calculations via storage means that stores raw data for image reconstruction using a direct memory access method; and storage means that a CPU retrieves and stores image data stored in the storage means. In the image data processing apparatus, in place of the storage means that stores raw data using the direct memory access method, first buffer storage means stores raw data for image reconstruction using a direct memory access method, and high-speed calculation means is used for image reconstruction. a switching means that is turned on and off depending on whether or not a configuration operation is to be performed; and a second buffer memory that stores raw data for image reconstruction together with the first buffer memory through the switching means using a direct memory access method. An image data processing device comprising: means.