科学家们在诊治心脏病上已开发了许多高级技术以监视心脏功能。心电图测量电活动,心音图分析声音的模式,心回声图监测心脏动作产生的超声回声,血管造影则用放射摄影分析心容积变化。虽然这些方法是有价值的,但很少能提供心动周期中心脏各部分之间相对的机械活动。为了获得大体图象,研究人员在胸部装上加速仪,并将其输出作数字滤波,以测定心脏的移位模 Scientists have developed many advanced techniques in the treatment of heart disease to monitor heart function. Electrocardiogram measurements of electrical activity, phonocardiogram pattern analysis of the sound, heart echo diagram to monitor the echocardiography of cardiac motion, angiography is the use of radiography analysis of heart volume changes. Although these methods are valuable, they rarely provide the relative mechanical action between the parts of the heart during the cardiac cycle. To get a general picture, the researchers fitted the accelerometer to the chest and digitally filtered the output to determine the heart’s displacement mode