What are CT, MRI and PET?
By Yoon Ja-young
The development of radiology has enabled early diagnosis, and greatly enhanced the survival rate of people with serious diseases.
Most people have heard of imaging devices such as CT, MRI and PET, but few seem to understand when each of these should be used. There is also growing concern that few people are aware of the risks involved in these scanning methods such as exposure to radiation.
X-ray
The most familiar form of medical imaging is the X-ray, which has been used for over 50 years. As X-ray passes through specific areas of the body, it shows lesions or injuries inside. X-rays are often used to check bones, chests and abdomens.
It is easy and cheap. One only has to hold a posture as directed and hold the breath while an X-ray is taken. However, as a person is exposed to radiation during this process, pregnant women had best avoid it. It is also used for diagnosis of breast cancer, but it is often useless for women with dense breast tissue. These women should take ultrasonography instead.
CT
CT, or computed tomography, is basically ano
Oct 26, 2012By Yoon Ja-young