Final answer:
MRI is most useful for viewing soft tissues, while ultrasound is the safest imaging technique during pregnancy because it uses no radiation.
Step-by-step explanation:
For viewing soft tissues, Magnetic Resonance Imaging (MRI) is the most useful imaging technique. An MRI scan uses a magnetic field and radiowaves to create detailed images of the organs and tissues in the body. Unlike X-rays or CT scans, MRI does not use ionizing radiation, which can damage tissues. MRI is particularly good for imaging the brain, spinal cord, nerves, muscles, ligaments, and tendons.
When it comes to imaging during pregnancy, ultrasound is considered the safest method and is commonly used for monitoring fetal development. Ultrasound uses sound waves to produce images and does not involve any radiation. This makes it the least invasive and most prudent choice for expectant mothers.