Automatic Measurement of Electrocardiogram by Electronic Computer
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概要
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For the purpose of automatic measurement of eletrocardiogram by an electronic computer of medium sized capacity, the following device has been made. The electrocadiogram recorded on magnetic tape is digitalized by an A-D converter at a sampling rate of 400/sec Smoothing is performed by use of moving average of successive 8 points or multiples of 8 points, because AC is 50 cps in the Tokyo area. Because moving variance is definitively larger at QRS deflection than at other periods in any case, the point showing maximum variance is found at the first step and is used as the key point for wave recognition. Separating points of waves (beginnings and ends of P, QRS and TU) are determined by diminution of gradient below the given critical value or augumentation of difference in gradients (in other words, the second derivative) above the given critical value, tracing the curve in antegrade or retrograde direction from the key point. Not only the tops and bottoms of waves but also all the points where the curve changes markedly in its direction are found by similar methods. The line connecting the beginning of Q wave with that of the following cylcle is regarded as zero level. Smoothing is performed simultaneously, not in advance, with these procedures. Because various processes to check mistakes in determination are added, the program seems slightly complicated, but the amount of computation is rather smoll, resulting in a shortening of the computation time.
- 一般社団法人 日本生体医工学会の論文
一般社団法人 日本生体医工学会 | 論文
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