JPH05312958A - Scintillation camera - Google Patents

Abstract

PURPOSE:To enhance accuracy of R wave synchronous multi-gate image in electrocardiogram by eliminating image data for arrhythmogenic heart beat and arbitrarily set subsequent heart beat from multi-gate image forming data. CONSTITUTION:An arrhythmia counter 15b is set at 0 and gamma ray 35 is taken from a specimen into a collecting circuit 36 and then stored, as an image data 37, into a buffer memory 11. At the same time, an electrocardiogram 32 is taken from an electrocardiograph 33 into an R-R circuit 14 where an R-R interval 34 is detected at every hear beat and delivered to a CPU 15. The CPU 15 makes a decision whether the R-R interval comes within a set time range. If it comes within the set time range, the CPU 15 decides that the hear beat is normal and a multi-gate converting circuit 12 converts the image data 37 into a multi-gate image 38 which is then stored in a memory 13. Upon decision of arrhythmia, number of hear beat to be removed is set in the counter 15b and image data for arrhythmogenic hear beat and subsequent heart beat is removed thus enhancing accuracy of multi-gate image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scintillation camera suitable for performing cardiac function diagnosis.

[0002]

2. Description of the Related Art As shown in FIG. 3, an electrocardiogram R-wave synchronous multi-gate method, which is a method of diagnosing cardiac function using a scintillation camera, captures an electrocardiogram 32 of a subject 31 from an electrocardiograph 33, and From the R wave to immediately before the next R wave using the R wave as a synchronization signal, that is, the RR interval of one heartbeat is 3
4 is divided into equal intervals, and the image data 37 obtained by collecting the γ-rays 35 from the subject 31 by the collecting circuit 36 are added together with the time phases thereof adjusted over several hundred heartbeats, thereby performing the systolic motion. Multi-gate image showing ECG R
This is a method of creating a wave synchronization multi-gate image) 38. In such an electrocardiogram R-wave synchronous multi-gate method, when an arrhythmia occurs as shown in FIG. 4 (FIG. 3 shows an example of arrhythmia), the image data 37 are added at different time phases, resulting in a multi-gate image. 38 to reduce the accuracy.

In order to obtain a highly accurate multi-gate image 38, the length of the R-R interval 34 of each heartbeat is checked and R
It may be considered that the image data 37 of the heartbeat whose -R interval 34 does not fall within a certain range is excluded from the addition as an arrhythmia. In the conventional scintillation camera, only the image data 37 of the heartbeat of the generated arrhythmia is removed and the electrocardiogram R
High accuracy of the wave synchronization multi-gate image 38 is achieved.

[0004]

In the conventional scintillation camera, only the image data 37 of the arrhythmic heartbeat is removed as described above, but in general, as shown in FIG. The heartbeat is also affected by the arrhythmia,
It is clinically known to exhibit an electrocardiogram 32 that differs from a normal heartbeat.

When the image data 37 of the heartbeat affected by the arrhythmia is added, as in the case of the arrhythmia, the addition is performed at different time phases, which deteriorates the accuracy of the electrocardiogram R-wave synchronized multi-gate image 38. There was a problem that the accuracy could not be improved sufficiently.

An object of the present invention is to provide an electrocardiogram R when an arrhythmia occurs.
An object of the present invention is to provide a scintillation camera capable of sufficiently enhancing the accuracy of a wave synchronous multi-gate image.

[0007]

The above object is to provide a scintillation camera capable of producing a multi-gate image showing a systolic motion by an electrocardiogram R-wave synchronous multi-gate method, in which R- of an electrocardiogram detected by the multi-gate method is detected.
The arrhythmia is detected by the R interval, and at the time of arrhythmia detection, it is achieved by providing a data removing means for removing the heartbeat of the arrhythmia and the image data of the arbitrarily set heart rate thereafter from the creation data of the multi-gate image. It

[0008]

When the arrhythmia is detected, the data removing means removes the heartbeat of the arrhythmia and the image data for the arbitrarily set heart rate thereafter from the creation data of the multi-gate image. As a result, when arrhythmia is detected (when arrhythmia occurs)
The accuracy of the R-wave synchronous multi-gate image of ECG will be sufficiently enhanced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a scintillation camera according to the present invention. In this FIG.
11 is image data 37 output from the collecting circuit 36.
Buffer memory for storing the image data 12
Is a multi-gate image conversion circuit for converting the electrocardiogram R-wave synchronized multi-gate image 36, and 13 is the conversion circuit 1
ECG R-wave synchronized multi-gate image created in 2 3
8 is a multi-gate image memory, and 14 is an RR circuit that takes in the electrocardiogram 32 from the electrocardiograph 33 and detects the RR interval 34.

Reference numeral 15 is a central processing unit for controlling each section of the apparatus. In the present invention, the central processing unit 15 is composed of a central processing unit main body 15a and an arrhythmia counter 15b, and at the time of detecting an arrhythmia, the heartbeat of the detected arrhythmia and the image data 37 of an arbitrarily set heart rate thereafter are obtained. It also constitutes a data removing means for removing from the created data of the multi-gate image 38. That is, the arrhythmia counter 15b
When the arrhythmia is detected, the preset image data removal heart rate is set and the RR circuit 14
Each time the R-R interval 34 is detected, the R-R interval 34 is subtracted by 1, and the central processing unit main body 15a is informed of the remaining number of heartbeats to be removed. Others are the same as in FIG.

Next, the operation of the scintillation camera of the present invention will be described with reference to the flow chart of FIG.

Step 101: Central processing unit main body 15a
Sets the arrhythmia counter 15b to zero.

Step 102: The collecting circuit 36 is the subject 3
Γ-ray 35 generated from 1 is taken in and image data 3
It is stored in the buffer memory 11 as 7.

Step 103: Simultaneously with step 102, the RR circuit 14 takes in the electrocardiogram 32 from the electrocardiograph 33, detects the RR interval 34 for each heartbeat, and detects the RR interval 3
4 is sent to the central processing unit 15 (central processing unit main body 15a).

Step 104: The central processing unit 15 having received the RR interval 34 judges whether the RR interval 34 is within the time range preset by the operator, and if it is within the range. It is determined that the pulse is arrhythmia, and the process proceeds to step 105. If it is out of the range, it is determined as an arrhythmia and the process proceeds to step 108.

Step 105: Central processing unit main body 15a
Checks the count value of the arrhythmia counter 15b, and if the count value is 0, proceeds to step 106. If the count value of the arrhythmia counter is other than 0, the process proceeds to step 109.

Step 106: The multi-gate image conversion circuit 12 takes out the image data 37 from the buffer memory 11, converts it into an electrocardiogram R-wave synchronous multi-gate image 38, and stores it in the multi-gate image memory 13.

Step 107: The operations of Step 102 to Step 106 are repeated for several hundred heartbeats.

Step 108: When the arrhythmia is determined in Step 104, the arrhythmia set by the operator in advance and the removed heart rate for the heartbeat after the arrhythmia occurrence are set in the arrhythmia counter 15b, and the process returns to Step 102.

Step 109: When it is determined in step 105 that the count value of the arrhythmia counter 15b is not 0, the central processing unit main body 15a determines the arrhythmia counter 15
The removed heart rate stored in b is subtracted by 1, and the process returns to step 102.

By repeating the above steps 102 to 109, it is possible to remove the heartbeat of the arrhythmia and the image data for the arbitrarily set heartbeat thereafter from the creation data of the multi-gate image. The accuracy of the electrocardiogram R-wave synchronized multi-gate image (when an arrhythmia occurs) is sufficiently enhanced.

[0022]

As described above, according to the present invention, when an arrhythmia is detected (when an arrhythmia occurs), the heartbeat of the arrhythmia and the image data for the arbitrarily set heart rate thereafter are converted into a multi-gate image. Since it is removed from the created data, there is an effect that the accuracy of the electrocardiogram R-wave synchronized multi-gate image at the time of arrhythmia detection can be sufficiently enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a scintillation camera according to the present invention.

FIG. 2 is a flowchart showing an operation of the same camera.

FIG. 3 is a diagram showing the principle of an electrocardiogram R-wave synchronous multi-gate image method.

FIG. 4 is a diagram showing processing at the time of arrhythmia detection by an electrocardiogram R-wave synchronous multi-gate image method in the case of a conventional scintillation camera.

[Explanation of symbols]

 11 buffer memory 12 multi-gate image conversion circuit 13 multi-gate image memory 14 RR circuit 15 central processing unit 15a central processing unit main body 15b arrhythmia counter 31 subject 32 electrocardiogram 33 electrocardiograph 34 RR interval 35 γ-ray 36 collection Circuit 37 Image data 38 ECG R wave synchronous multi-gate image

Claims (1)

[Claims] 1. A scintillation camera capable of producing a multi-gate image showing a systolic motion by an electrocardiogram R-wave synchronous multi-gate method, wherein an arrhythmia is detected by an R-R interval of an electrocardiogram detected by the multi-gate method,
A scintillation camera comprising a data removing means for removing the heartbeat of the arrhythmia and the image data of an arbitrarily set heartbeat thereafter from the creation data of the multi-gate image when the arrhythmia is detected.