Final answer:
1) MRI: Images produced by displacing protons with radiofrequency signals. 2) X-ray: Pattern of absorption observed through planes. 3) Ultrasound: Images produced by reflection of high-frequency sound waves. 4) PET: Scan using positron-emitting radionucleotides.
Step-by-step explanation:
1) Magnetic Resonance Imaging (MRI): Images are produced by displacing protons in atomic nucleic with radiofrequency signals. MRI is a non-invasive medical imaging technique that uses radio waves and a strong magnetic field to create detailed images of the body's soft tissues and organs.
2) X-ray: An X-ray is taken in which the pattern of absorption is observed through planes. X-rays are a form of electromagnetic radiation that can pass through the body and create an image based on the varying absorption of the X-rays by different tissues.
3) Ultrasound: Images are produced by the reflection of high-frequency sound waves as they pass through body tissue. Ultrasound is a non-invasive imaging technique that uses sound waves to create images of the body's internal structures.
4) Positron Emission Tomography (PET): A nuclear medicine scan in which positron-emitting radionucleotides are injected into the patient, and then the patient is scanned externally to determine uptake of the contrast medium. PET scans are used to detect and monitor diseases, such as cancer, by measuring the metabolic activity of tissues and organs.