Physics

Question 1

reason that iodine contrast media causes an increase in the blood’s ability to attenuate x-rays

Answer 1

Higher atomic number of iodine increases photoelectric interactions

Question 2

fetal exposure to CT radiation is due to

Answer 2

internal scatter

Question 3

technique used for functional MRI

Answer 3

Blood Oxygen Level Dependent (BOLD)

Question 4

what interaction is the primary source of scattered radiation in diagnostic radiography?

Answer 4

compton

dominant interaction in soft tissue above 26 keV

Question 5

Increasing the skin to image receptor distance increases or decreases entrance skin dose?

Answer 5

increases

Question 6

Which physical property allows contrast media to provide enhanced contrast at certain xray energies?

Answer 6

K absorption edge

Question 7

What is the minimum inherent threshold energy required for the positron emission decay
process to occur?

Answer 7

1.022 MeV

Question 8

typical uptake time for oncology F-18 FDG PET-CT whole body scan?

Answer 8

60 minutes