A) Ultrasonography
B) CT scanning
C) MRI
D) NMR
Correct Answer: B
Solution :
Computed Tomography (CT), sometimes called computerised tomography or Computed Axial Tomography (CAT), is a noninvasive medical examination or procedure that uses specialised X-ray equipment to produce cross-sectional images of the body. As X-rays are electromagnetic waves. They are used in diagnosis because all substances and tissues differ in their ability to absorb X-rays. Some substances are more permeable to X-rays, while some others impermeable. Thus, different tissues seem different when the X-ray film is developed. Dense tissues such as the bones appear white on a CT film while, the soft tissues such as the brain or kidney appear gray. The cavities filled with air such as the lungs appear black. In CT scanner, the X-ray source and the detector are interconnected and rotated around the patient during scanning period. Digital computers then assemble the data that is obtained and integrate it to provide a cross-sectional image (tomogram) that is displayed on a computer screen.
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