|The ultrasound technique is used frequently in obstetrics instead of X-rays based techniques. What are the principles behind this?|
|1. Ultrasound is a non-ionising imaging technique.|
|2. Ultrasound gives a clear picture of soft tissues, which do not show up in X-rays.|
|3. Ultrasound causes almost no health problems (for a mother or unborn foetus).|
|Select the correct answer using the codes given below.|
A) 2 and 3
B) 1 and 2
C) 1 and 3
D) All of these
Correct Answer: D
Solution :[d] Ultrasound, also called sonography, is another type of 3-D computerised imaging. Using brief pulses of ultrahigh frequency acoustic waves (lasting 0.01 seconds), it can produce a sonar map of the imaged object. The technique is similar to the echolocation used by bats, whales and dolphins. By measuring the echo waves, it is possible to determine the size, shape, location and consistency (whether it is solid, fluid-filled or both) of an object. Ultrasound is a very safe, non-invasive imaging technique. Unlike X-rays, sonography does not use ionising radiation to produce an image. It gives a clear picture of soft tissues, which do not show up in X-rays. Ultrasound causes no health problems (for a mother or unborn fetus) and may be repeated as often as necessary. Current evidence indicates that diagnostic ultrasound is safe for the unborn child unlike radiographs, which employ ionizing radiation. However, no randomised controlled trials have been undertaken to test the safety of the technology and thus ultrasound procedures are generally not done repeatedly unless medically indicated.
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