JPH067164B2 - Biometric data collection device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a biometric data collection device for collecting biometric data for each phase of its movement cycle.

2. Description of the Related Art Conventionally, when image data of the heart is collected by, for example, a scintillation camera or an MRI apparatus, image data is collected for each phase of the periodic motion of the heart. In this case, the movement cycle of the heart is measured using an electrocardiograph, a gate signal is created according to a waveform (eg, R wave) generated in a predetermined phase, and at a fixed time after the gate signal is generated. Data are collected separately (for example, heart loop analysis). Further, in this method, if the period is not constant, it is not possible to collect data of the same phase. Therefore, an inverse gate method has been devised which collects data at a constant time before the gate signal as a starting point.

[Problems to be Solved by the Invention]

However, in these conventional cases, since the gate signal is used as a starting point and data is collected at fixed time intervals after or before that, when the cycle fluctuates, the phase relationship does not match for the time segment distant from the gate signal. However, there is a problem that accurate analysis cannot be performed using this. On the other hand, in the case of a mild pumping disorder of the heart, the period of one cycle (gate interval) becomes indefinite.
Of the cycle period, systole is constant and diastole is indefinite. The present invention is particularly effective in analyzing the reserve capacity of pump motion in such a mild pump failure of the heart, and is capable of collecting data for each phase with high accuracy regardless of fluctuations in the cycle. The purpose is to provide.

[Means for Solving the Problems]

To achieve the above object, in the biological data collecting apparatus according to the present invention, a means for collecting data by a certain time segment after a gate signal generated at a specific phase of the detected biological cycle signal and holding the data at each gate interval, The data for each gate interval is added for each corresponding time segment for the time segment data that falls within a specific period of the gate interval, and the time segment is changed for the data segment for the remaining period. Means for adding as data of the same number of sections for each corresponding time section are provided.

[Action]

Data is collected at equal time intervals during a specific period of the gate interval, and data is equally divided during the remaining period. Therefore, when the cycle fluctuates, the fluctuation is averagely processed in the period when the data is equally divided, and the inconvenience of locally wrinkling the cycle fluctuation is avoided and the accuracy of the collected data is improved. . Especially, in the case of analysis of the reserve function of the heart pump function, it is possible to obtain accurate analysis by collecting data at equal time intervals during the period corresponding to systole, and equally dividing data collection during the period corresponding to diastole. Is possible. This is because the systole is constant and the diastole is indefinite in the case of mild cardiac pump failure.

【Example】

Next, an embodiment of the present invention will be described with reference to the drawings. In this example, the heart RI (radioisotope) is used.
The present invention is applied when an image is obtained for each phase. In FIG. 1, a scintillation camera 2 is directed toward a subject 1, and the scintillation camera 2 captures radiation from RI that has been administered into the body and accumulated in the heart. The radiation incident position information obtained from the scintillation camera 2 every time the radiation is incident is stored in the storage device 4 via the data collection control device 3. On the other hand, an electrocardiograph 5 is set on the subject 1 to detect an electrocardiogram. The waveform of the electrocardiographic signal obtained here is as shown in FIG.
The gate signal generator 6 captures the wave and generates a gate signal, which is sent to the data collection controller 3. When the gate signal corresponding to the R wave is input, the data acquisition control device 3 causes the storage device 4 to store the data from the scintillation camera 2 after every certain time segment. As a result, as shown in FIG. 2, in a certain period (A period), j pieces of time division data A1, A2, ..., Aj are stored for each fixed time segment,
In the next cycle (B cycle), k pieces of time division data B1, B
2, ..., Bk will be stored. When the cycle (gate interval or R wave interval) changes, j ≠ k. By the way, in the case of mild pump failure of the heart, when one cycle time, that is, the time from the R wave to the R wave changes, the systole is constant and only the diastole changes, as shown in FIG.
Therefore, the data processing device 7 sends the above time-division data read from the storage device 4 to the adding device 8 as it is during the period corresponding to the systole. Therefore, during systole, the A-cycle time division data and the B-cycle time division data are added for each corresponding time segment (that is, A1 + B1, A2 + B2, ... Is performed). On the other hand, for the diastole, the other time division data is corrected according to the number of sections of the A cycle or the B cycle. For example, when adjusting to the B cycle, as shown in FIG. 4, the time-division data in the diastole of the A cycle is corrected by the data processing device 7, and the same number as the number of time-division data in the diastole of the B cycle is used. Obtain the divided time-division data. The addition unit 8 adds these and the B-cycle time-division data. Then, the time-division data after addition is stored in the storage device 4 again. In this way, since the fluctuation of the cycle is corrected throughout the diastole, local wrinkling of the cycle fluctuation is avoided, and the accuracy of the accuracy suitable for the analysis of the reserve capacity of the pump function of the heart as described above is avoided. You get good data. In the above, data is collected at equal time intervals during the systole of the heart, and data is equally divided during diastole, that is, the end of the collection is used as the boundary, but the boundary may be moved to another time point. It is possible. For example, the second heart sound
It is possible to set a sound as a boundary, a period before that as a period for collecting data at equal time intervals, and a period after that as a period for collecting data in equal divisions. It is also possible to provide a circuit for deciding whether to store or discard the data for each heartbeat, and to configure the arrhythmia when the gate interval is extremely short or long so that the data itself is not stored. . Furthermore, although the data acquisition relating to the RI image of the heart has been described above, the present invention can also be applied to the case of acquiring image data (RI image, MRI image, etc.) affected by other periodic motions such as respiratory motion.

【The invention's effect】

According to the biological data collecting apparatus of the present invention, when collecting biological data for each phase of the movement cycle, it is possible to collect data for each phase with high accuracy regardless of the fluctuation of the cycle. . Therefore, it is particularly useful in the field of nuclear medicine for early diagnosis of pump failure of the heart and heart diagnosis of children with unstable heartbeats.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a time chart showing the relationship between an electrocardiographic signal and time-division data corresponding thereto, and FIG. 3 is a time chart of the electrocardiographic signal and the volume of the heart. FIG. 4 is a schematic diagram for explaining the addition of time division data, which is a time chart showing the relationship with the transition. 1 ... Subject, 2 ... Scintillation camera, 3 ... Data collection control device, 4 ... Storage device, 5 ... Electrocardiograph, 6 ... Gate signal generator, 7 ... Data processing device, 8 ... Addition device.

Claims (1)

[Claims] 1. A means for collecting data for each fixed time segment after a gate signal generated at a specific phase of a detected biological cycle signal and holding the data for each gate interval, and the held data for each gate interval among the gate intervals. For the data of the time segment that enters the specified period of, add for each corresponding time segment, and for the data of the time segment that enters the remaining period, change the time segment and add the same number of data for each corresponding time segment A biometric data collection device comprising: means for adding.