After getting the qualification certificate, you can choose ultrasound imaging, and then you have to take the post certificate of color ultrasound. This determines whether you can operate the color ultrasound instrument in the future. Ordinary black and white units do not need exams.
Of course, you can also apply for B-ultrasound study in a higher hospital first, and then get a certificate, but before you have an assistant qualification certificate, you only have the right to write a report, and you can't send it alone.