You can't. B-ultrasound doctors and nurses have different academic requirements. B-ultrasound doctors need to have a bachelor's degree in medical school, while nurses only need a junior college degree, which can't meet the academic requirements required by B-ultrasound doctors. B-ultrasound doctors need to have professional medical knowledge and skills, receive professional medical training and assessment, and carry out B-ultrasound examination and diagnosis. Nurses play an important role in the medical team, assisting doctors in diagnosis, treatment and nursing.