3. B-mode ultrasound imaging display
In order to obtain anatomical images of human tissues and organs, following the application of A-type ultrasonic diagnostic equipment to the clinic, B-type, P-type, BP-type, C-type and F-type ultrasonic imagers have come out one after another, because one of their common characteristics is to achieve In order to display the tomographic display of human tissues and organs, this type of instrument is usually called an ultrasonic tomographic diagnostic instrument.
Although the B-mode ultrasound imaging diagnostic apparatus is named for its imaging method using brightness modulation, the image displayed is a two-dimensional ultrasound tomogram (or cross-sectional view) of human tissue or organs. For sports The organs can also be displayed dynamically in real time. Therefore, the B-type ultrasonic imager and the A-type and M-type ultrasonic diagnostic equipment are quite different in structure and principle.
The B-type ultrasonic imager and the M-type use the brightness modulation method to display all interface reflection echoes in the depth direction, but the ultrasonic sound beam emitted by the probe is a rapid electronic scanning method in the horizontal direction (equivalent to rapid and equal interval change A The position of the super probe on the human body), successively obtain the reflected echoes of all interfaces in the depth direction at different positions. When one frame of scanning is completed, a vertical plane two-dimensional ultrasonic tomographic image determined by the scanning direction of the ultrasonic beam can be obtained. This is called a line scan tomographic image. It is also possible to change the angle of the probe (mechanical or electronic), so that the direction of the ultrasonic beam can be changed rapidly, so that the reflected echoes of all interfaces at different depths in the detected direction at a certain small angle are displayed in the form of bright spots. On the corresponding scan line, a vertical fan-shaped two-dimensional ultrasonic tomographic image determined by the swing direction of the probe can be formed, which is called a fan-shaped scan tomographic image.
