The difference between "B ultrasound" and "color ultrasound"
During the daily ultrasound examination, we found that many patients would ask "Doctor, are you color Doppler ultrasound? Why is it black and white?". Commonly known as "B-ultrasound" is the use of probe scanning to repeatedly transmit and receive ultrasonic sound beams to form a two-dimensional cross-sectional image displayed on the screen, that is, two-dimensional ultrasound. The echo intensity is reflected to the corresponding position of the screen with different brightness points. The gray-scale cross-sectional image of the morphology of the organ.
Ultrasound imaging uses grayscale changes from white to gray to black to show changes in the physical characteristics of organs or lesions. For example, liquid appears black, gallstones, bones or gas appear bright white; due to the fast speed of ultrasound imaging, It can display the real-time situation of organ activity; two-dimensional ultrasound has azimuth: XY-axis cross-sectional grayscale images up and down, left and right, front and rear, and Z-axis requires three-dimensional scanning.
With the gradual improvement of medical conditions in my country, many larger medical institutions have already eliminated this simple two-dimensional ultrasound instrument and replaced it with a color Doppler ultrasound system. People call it "color Doppler ultrasound". The actual color ultrasound instrument has an abdomen. , Cardiac, 3D and other different models, color Doppler actually includes B-mode, color Doppler, M-mode echocardiography and other related inspection and analysis software. The function and application range are related to the specific configuration of the instrument. The role of black and white ultrasound is distinguished from that of color ultrasound.
Simply put, "color Doppler" means high-definition black and white B-mode ultrasound plus color Doppler. Its main advantages are: it can quickly and intuitively display the two-dimensional planar distribution of blood flow; it can display the running direction of blood flow; it is helpful to distinguish arteries and veins; it is helpful to identify vascular disease and non-vascular disease; it is helpful to understand the nature of blood flow It can easily understand the phase and speed of blood flow; it can reliably find shunt and reflux; it can quantitatively analyze the origin, width, length and area of the blood stream. These ultrasound performance and parameters play a very important auxiliary role in the diagnosis of clinical diseases.
"Color Doppler ultrasound" can display the changes in blood perfusion of organs or lesions, distinguish solid or cystic masses, according to the blood flow spectrum changes of the cyst wall and solid masses, such as blood flow speed, shape, resistance, and blood perfusion characteristics. Reference basis for qualitative diagnosis, such as low-resistance solid masses are more common in malignant tumors.
"Color Doppler ultrasound" judges the hemodynamic changes of the cardiovascular system: filling state, blood flow color, direction, path, speed, pressure, phase, time, flow, etc. for disease diagnosis; such as small atrioventricular septal defect, two-dimensional Ultrasound may not be able to show the gap, but as soon as the color Doppler is applied, it can clearly show the shunt of the defect site, which plays an important role in assisting diagnosis; another example is heart valve stenosis and vascular stenosis, when blood flows through the narrow opening. , Due to the increase of the proximal pressure, multicolored inlaid jets will appear at the narrow and distal ends. The doctor can quantify the valve orifice area based on the half-time of the pressure drop measured by the spectral Doppler.
Therefore, the difference between "color ultrasound" and "B ultrasound" cannot be equated with the difference between a color TV and a black-and-white TV. Hope that these little knowledge can better help the majority of patients better understand the difference between "color Doppler ultrasound" and "B-ultrasound".
