On April 21, the General Office of the National Health Commission issued a notice on further promoting and accelerating the work related to rehabilitation surgery, emphasizing the need to advance and accelerate the relevant work in the field of rehabilitation surgery.

A portable color ultrasound machine is a form of medical ultrasound imaging using small and lightweight equipment. It is utilized in various clinical settings such as cardiology, vascular surgery, radiology, endocrinology, pediatrics, and obstetrics and gynecology for diagnostic purposes.

Cardiac Doppler echocardiography is a highly effective diagnostic method for heart diseases, especially congenital heart diseases, in clinical practice. Since the 1980s, ultrasound diagnostic technology has been developing at an astonishing pace. Like magnetic resonance imaging, CT scans, and isotope scans, cardiac Doppler echocardiography holds a significant place among the four major diagnostic imaging technologies in modern medicine.

B超对于人体是否安全的关键在于超声的剂量，就是超声的强度和照射时间的乘积。高强度长时间的超声波可对人体或胎儿产生损伤。

Gastrointestinal color Doppler ultrasound is primarily used to examine certain organs within the abdominal digestive system. These organs include the liver, pancreas, gallbladder, spleen, and others. It assesses the size and volume of these organs, checks for the presence of any abnormalities or growths within them, and identifies any structural changes or organic alterations.