超声背向散射积分(integrated backscatter, IBS)及其心动周期变化幅度(cyclic variation in integrated backscatter,CVIB)能反映心肌的病理学和动力学特征.
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2．2背向散射积分心动周期变化幅度（cycle variationof integratedbackscatter，CVIB）：由于心靛静瘸期运动，心魏豹IBS 值也呈周期性变化，舒张末期IBS值最大，收缩末最小，二者 之差即...
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...应用腺苷的临床价值 kg-1·min-1)3 h，PCS术后4周利用IBS 技术检测受累心肌的IBS,IBS%,IBS 周期变化幅度(cycle variation of IBS，CVIB)，N延迟。所有患者口服阿司匹林300 mg，静脉滴入肝素，成功进行冠脉造影及PCS。
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IBS周期变化幅度 cycle variation of IBS ; CVIB
IBS 周期变化幅度 cycle variation of IBS
及其心动周期变化幅度 cyclic variation in integrated backscatter
周期的变化幅度 cyclic variation of IBS ; CVIB
太阳活动的盛衰以11年为一个周期，在一个周期内，太阳放射的紫外线的变化幅度要比其放射的能量的变化幅度要大得多。
The sun's activity waxes and wanes on an 11-year cycle, and over this cycle the amount of ultraviolet light the sun emits changes a lot more than does the total amount of energy.
井口空气压力变化的周期越大，则井水位的响应幅度越大，而响应的位相滞后越小。
The greater the period of pressure variation in well air is, the greater is the response amplitude of well water level, while the smaller is the phase lag of the response.
使用不同恒温条件，发现以一年为周期的缓慢变化，幅度可达500微伽。
Different ways of stabilizing the outside temperature were employed. A slow periodic annual variation of its readings was observed with amplitude of about 500 microgals.
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