Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which of the following pairs is correctly matched ? (1) Angiography ? Magnetic field (2) Sonography ? Ultrasound (3) NMR ? Ionising radiations (4) CT scanning ? X-raysA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
Angiography is a technique of radiographic visualization of blood vessels of a region or organ after injecting a radio-opaque or contrast agent (eg, iodine) or fluoroscopic chemical. Sonography involves the use of high frequency sound (ultrasonic) waves to produce images of structures within the body. NMR does not use ionizing radiations. It uses a strong external magnetic field. CT scanning is an invasive radiographic technique in which short X-rays are passed through the body from various angles and the images are picked up by special X-ray detectors.
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