A CT scan uses a narrow X-ray beam operating at a high energy level to capture cross-sectional images of inside organs from many different angles and create a detailed 3D images with advanced computer technology.
While CT provides superior image resolution of bony structures, capturing images of soft tissues requires the use of contrast agents for better visualisation. Taking abdominal examination as an example, contrast agent, which blocks X-ray penetration via soft tissues, can highlight the structural organisation of the intestine.
It is generally used to assess head, neck, breast, abdominal and pelvic regions. With regards to the surveillance of cancer, CT is commonly applicable for monitoring the lesions in thorax, abdominal and pelvic regions.
Below is the information regarding the uses, safety issues, concerns of undergoing a CT examination and its advantages and limitations in comparison with other types of imaging modalities.