Ultrasound imaging is often chosen in place of X-ray imaging for examining soft tissues inside the human body. Study the points below and answer the questions.
(i) Explain why ultrasound does not pose the same health hazards as X-rays when used on patients.
(ii) Compare ultrasound and X-rays with respect to (a) typical wavelength, (b) ability to pass through soft tissue, and (c) potential biological effects.
(iii) Describe one clinical situation in which ultrasound is preferred and one in which X-rays are still necessary, giving a reason for each choice.