in 199s, four color Doppler techniques were developed: factory Doppler energy map, power Doppler imaging and angiography (color Doppler imaging IgG, Power DoPPerImaging Anglo). (2) Color Doppler energy diagram (CDE). (3) Color Doppler tissue imaging (CDT! Also known as Doppler myocardial imaging (DMI). (4) energy motion imaging (PMI). CDFI, CDTI and CDE are all imaged by adding the information of Doppler shift signal to the conventional two-dimensional image, which shows the movement of blood flow or tissue. Although CDE can't express the direction and velocity of color blood flow, it has high spatial resolution and is very sensitive to the low-speed blood flow of small vessels. At present, it can display the low-speed blood flow of mm/s.
Toshiba Company of Japan combined the strengths of CDFI and CDE, and invented a DPA (Directional Energy Map), which is sensitive to low-speed blood flow and directional with color Doppler. CCD (color Doppler velocity energy map) is a new technology developed in recent years, which is simpler and more sensitive to blood flow imaging. In particular, it can display the coronary artery interspersed branches in myocardium, which opens up a new field for the study of coronary heart disease.
the patented technology of B-FIOW of GE company in the United States obtains better spatial resolution and time resolution of blood vessels and blood flow images, and can dynamically and clearly see the movement of blood flow and the irregular movement of blood vessel wall. It is a new breakthrough in ultrasonic technology. QTV (quantitative tissue velocity imaging) technology is a new technology emerging in recent years, and it is a new means to quantitatively analyze myocardial viability. Based on the original data storage and ultra-high frame rate, it overcomes the limitations of traditional Doppler myocardial imaging, so it can be widely used in clinical examination of coronary heart disease, hypertension, cardiomyopathy, cardiac electrophysiology and so on.
AMM (linear anatomy M-mode) technology introduced by p>Ge system Five high-end digital Doppler ultrasonic diagnostic instrument develops the traditional M-mode echocardiography technology. Arbitrary sampling in the range of 36 "can accurately observe the thickness and thickening of each ventricular wall of the heart, which is also conducive to the accurate measurement of ejection fraction. M-mode images obtained on the basis of two-dimensional echocardiography stored in different periods, and M-mode images obtained on two-dimensional echocardiography stored in different periods can compare the motion of multiple ventricular wall segments of the same patient in different periods, which is of great significance for understanding treatment and judging prognosis. CMM (Curve Anatomy M-shape) is placed on the two-dimensional color Doppler velocity image, and the "M-shape curve" is placed on any section of myocardium in the scanning section, and its sampling line can be in any direction and shape, and can be placed in the center of the myocardial wall, and then the systolic and diastolic movement phase information of all myocardial segments in the scanning section in the real-time two-dimensional color Doppler image is obtained, as well as local myocardial functional indexes such as velocity, motion amplitude, acceleration, energy and stress rate. Combined with quantitative tissue velocity imaging (QTVI), it brings a new method to analyze myocardial ischemia, myocardial excitation sequence and multi-segment myocardial motion.