圆锥
发表于 2025-3-28 15:36:53
Nonlinear Vibrations and the Wave EquationOne of the reasons why echocardiography has not replaced angiography is due to the poor resolution of intracardiac blood-flow images. Thus, a non-invasive method for real-time blood-flow imaging using ultrasound has long been required in the fields of both cardiology and cardiovascular surgery.
shrill
发表于 2025-3-28 19:19:34
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货物
发表于 2025-3-29 00:17:34
A history of echocardiography,This will be a rather personal narrative, based on recollected history backed by publications where possible. More details and illustrations are in a number of publications by the early workers . The chronological tables show the parallel time course of development in Europe, Japan and the United States.
大火
发表于 2025-3-29 06:32:10
,Time interval histogram — An alternative in the detection of the maximum velocity in the heart,Up to late seventies the essentially only method of Doppler frequency measurement was the counting of zero crossings (ZCC) of Doppler signal. The response of the ZCC to the signal is in direct proportion to the second moment of the spectrum of the measured signal.
组成
发表于 2025-3-29 07:44:06
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凝结剂
发表于 2025-3-29 13:10:05
Evaluating the fetal circulation by combined pulsed Doppler and 2-D echocardiography,Recent advances of 2D echocardiography and Doppler method have enabled us to record the states of fetal heart and to analyse fetal cardiac anatomy and physiology.
Parameter
发表于 2025-3-29 16:26:11
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精密
发表于 2025-3-29 23:16:25
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watertight,
发表于 2025-3-30 01:08:59
Y. Y. Chen,C. P. Tsai,H. H. Hwungon. Moreover, the ability of 2DE to quantify mitral stenosis in patients with poor parasternal short-axis images is quite limited. This is especially true when assessing restenosis following commissurotomy since surgery frequently deforms the valve and submitral structures causing echo dropout of both the medial and lateral valve margins.
无王时期,
发表于 2025-3-30 05:12:35
T. R. Akylas,Yorgos D. Kantziosstolic pressure as this is a sensitive measure of left ventricular function. Changes in the resting end diastolic pressure often preceed changes in other parameters of left ventricular function and provide an early marker of deterioration in left ventricular function. They also reflect early changes in response to treatment.