You need to know about B-ultrasound and MRI!
MRI uses a powerful magnetic field to vibrate the water in the body, then calm it down, feel the vibration inside, and after forming an image, you can observe the difference between the normal tissue and the diseased part. Therefore, MRI has also been jokingly referred to as a "shaking examination".
Application situation:
NMR can be sliced at any angle at will, and there is no radiation. The anatomy and pathological display of the brain, spine and spinal cord are better than CT;
MRI is more sensitive to diseased tissues than CT, especially for soft tissues such as joints, muscles, and central nervous system, with clearer structures.
MRI has unique advantages in the mutual identification of spine, joints, tumors, infectious diseases, lymph nodes and vascular structures.
defect:
In some aspects, MRI is inferior to CT. Such as: the detailed performance of the lungs, bone structure, fractures, etc., so sometimes the orthopedic doctor will require both to be checked;
It should be noted that people with metal objects in their bodies and those with pacemakers should not receive MRI, and they must inform their doctors before the examination.
B-ultrasound uses ultrasonic waves to penetrate the human body. When sound waves encounter human tissues, they produce reflected waves. The reflected echoes are B-ultrasound images. This is like when choosing a watermelon, tapping and listening to understand the situation inside.
Application situation:
B-ultrasound is known for its low intensity, high frequency, no damage to the human body, no pain, and various display methods. It is especially unique in the detection of human soft tissues and the observation of hemodynamics of cardiovascular organs, such as: shallow Table lumps, blood vessels, puncture location, etc.
B-ultrasound is radiation-free and can be used for physical examinations of pregnant women. It can also find some bone problems such as fractures to avoid X-ray damage.
defect:
The penetrating power of B-ultrasound is weak, and it is difficult to detect air-bearing organs, such as lungs and intestines. It is also difficult to display on the ultrasound image when the lesion is small or the acoustic impedance difference is not large, such as: tumor tissue of about 1cm It is not easy to detect and has certain limitations.
