Which one of the following techniques is safest for the detection of cancers?
- Computed tomography (CT)
- Magnetic resonance imaging (MRI)
- Histopathological studies
- Radiography (X-ray)
Answer
(2) Magnetic resonance imaging (MRI)
Solution
As per NCERT, radiography (X-rays) and CT use X-rays, which are ionising radiations.
⇒ MRI uses strong magnetic fields and non-ionising radiations to accurately detect pathological and physiological changes in living tissue.
⇒ Histopathological study needs a piece of tissue (biopsy) to be removed.
∴ MRI is the safest technique.
Answer: (2)