9:48 5G Back BMED3501_2A_2021.... a a. It employs images acquired with two different x-ray energies. b. It requires inje

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9 48 5g Back Bmed3501 2a 2021 A A It Employs Images Acquired With Two Different X Ray Energies B It Requires Inje 1 (117.83 KiB) Viewed 44 times

9:48 5G Back BMED3501_2A_2021.... a a. It employs images acquired with two different x-ray energies. b. It requires injection of contrast agent and utilizes the k-edge in X-ray absorption curve. C. The dual-energy immaging concept has been used for both x-ray ungiogruphy and bone density measurement 1-11. Ionizing radiation is known to damage cells at DNA level. The process involves the following caseading events: a. X-ray photons prochucing free charged particles such as electrons, immediately creating ion pairs and free radicals which can cause DNA breaks almost instantly b X-ray photons producing free charged particles such as electrons, immediately creating ion pairs and free radicals which can cause DNA breaks over a period on the order of several days to months. c. X-ray photons directly interact with DNA and causing DNA breaks over a period on the order of several days 1-12. Which quantity is defined to quantify the biological effects of certain x-ray exposure? a. Exposure (in Ror Cikg). b. Absorbed dose (in rad or Gy). c. RBF dose (in rcm or Sv). 1-13. Compensation filters are often used in film-based x-ray detection as shown in the examples below. What is their purpose? wedge ther trough her trough ters a. The purpose is to make the film exposure more uniform. h. The purpose is to reduce scattering effects. c. The purpose is to filter out low-energy x-ray photons. 1-14. Which statement is true for SPECT and PET imaging? a. Both methods suffer from both self-absorption'attenuation and scattering problems. b. Both methods suffer from self-absorption'attenuation problem only. c. Both methods suffer from scattering problem only. 1-15. . Which statement is correct in nuclear medicine imaging? Radioactive tracers should have as short half-life as possible. a. BMED3501 Page 4 of 9