Question

1. which of the following imaging techniques would be best to use to study the uptake of nutrients by rapidly multiplying cancer cells? a. ct b. mri c. pet d. ultrasonography 26. which of the following imaging studies can be used most safely during pregnancy? a. ct scans b. pet scans c. ultrasounds d. x - rays 27. what are two major disadvantages of mri scans? a. release of radiation and poor quality images b. high cost and the need for shielding from the magnetic signals c. can only view metabolically active tissues and inadequate availability of equipment d. release of radiation and the need for a patient to be confined to metal tube for up to 30 minutes

Explanation:

• For question 25, PET (Positron - Emission Tomography) can detect the metabolic activity of cells, including the uptake of nutrients by rapidly multiplying cancer cells as it uses radioactive tracers that are taken up by metabolically active tissues.
• For question 26, ultrasounds use high - frequency sound waves and do not involve ionizing radiation, making them the safest imaging method during pregnancy. CT scans, PET scans, and X - rays all involve ionizing radiation which can be harmful to the developing fetus.
• For question 27, MRI scans are expensive due to the cost of the equipment and maintenance. Also, the strong magnetic fields require shielding to prevent interference with other equipment and potential harm to people with certain metal implants. MRI does not release radiation.

Answer:

1. C. PET
2. C. ultrasounds
3. b. high cost and the need for shielding from the magnetic signals