A-mode ultrasound: A-type ultrasound instrument is a method of diagnosis using amplitude modulation. Since the first letter of the English word of the word amplitude is A, A-type ultrasound diagnosis is made. It is displayed by the echo amplitude level and wave number flow density. The vertical axis represents the strength of the echo signal, and the horizontal axis represents the echo time (distance). The commonly used A-type ultrasonic diagnostic instrument is used to measure the distance between the tissue interface, the size of the organ, and to identify the acoustic properties of the lesions, and the results are relatively accurate.
B-ultrasound: B-type ultrasound diagnosis is a brightness modulation type, because the first letter of the brightness modulation phrase is B, so B-type ultrasound diagnosis. The lesions are displayed with the intensity of the punctate echoes. Stronger echoes are brighter, and weaker ones are darker. When the probe beam moves in sequence, the dot echoes on the oscilloscope move synchronously with it. Since the scan forms a sectional echogram that is consistent with the direction of the sound beam, it belongs to a two-dimensional image and has the advantages of strong authenticity, good intuition, easy to grasp and convenient diagnosis.
M-ultrasound: M-mode ultrasonography is a uniaxial measurement of the curve of distance over time, and is used for cardiac examination as single-beam echocardiography. It displays the reflected signals of the various layers of the heart on the screen as point echoes. When the heart beats, these punctate echoes move up and down. At this time, a pair of slow-scan sawtooth waves representing time are added to the horizontal deflection plate of the oscilloscope, so that the dotted echoes are slowly scanned in the horizontal direction to display the motion echo curves of each layer of the heart. The vertical direction of the image represents the depth of the human body, and the horizontal direction represents the time. Due to the fixed position of the probe, the heart contracts and relaxes regularly, and the rhythm changes in the distance between the layers of the heart and the probe. Therefore, the echoed ultrasound signal also changes. With the slow scan in the horizontal direction, the echoes of various layers of the heart are displayed as moving curves, which is M-mode echocardiography.
Also known as Color Flow Map (CFM), which is what everyone calls color Doppler ultrasound; it is a method of displaying blood flow with real-time color coding on the basis of Doppler two-dimensional imaging, that is, different colors are displayed on the display screen. blood flow direction and velocity. The color Doppler is uniformly coded as the near-ultrasonic probe, which is red; the blood flow leaving the probe is blue. Turbulence and Diversion are multi-color mosaics.
D-type ultrasonic Doppler diagnostic instrument:
This type of diagnostic instrument uses the Doppler effect principle to detect moving organs and blood flow.
According to the working state of the ultrasonic source in the time domain, the Doppler system can be divided into continuous wave Doppler and pulse wave Doppler.
Different from CDFI, D-mode ultrasound Doppler diagnosis uses the blood flow spectrum to show the difference in Doppler frequency shift of moving organs and blood flow.
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