Radiology- NBDE II Questions & Answers A+ Review

Radiology- NBDE II Questions & Answers A+ Review 1 / 20 1. Barium salts make gutta percha radiopaque. 2. No barrier, protection of dentist should be how far 6 feet , 90-135 degrees 3. most of X ray is converted to Heat 4. What is the oil in the xray tube for 5. Primary source of radiation to operator when taking xray 6. In performing normal dental diagnostic procedures, the operator receives the greatest hazard from which type of radiation? 7. Radiology dosage allowed in a dentist per year dissipate the heat (cooling) *cools off the anode scatter from the patient scatter and secondary 50msv , or 5rem per year 8. What does collimination do Decrease xray beam size and volume of irradiated tissue *Circle diameter of 2.75in** 9. What does collimator NOT do Increase penetrability 10. Collimination IN XRAY works by Reducing low energy radiation 11. What percent does collimator reduce the volume of tissue being irradiated and amount of scatter radiation 12. collimation does everything except ? A. reduce pct exposure 60% D. reduce average energy of xray Radiology- NBDE II Questions & Answers A+ Review 2 / 20 B. reduce operator exposure C. film fog D. reduce average energy of xray 13. Collimating DOES NOT Prevent what 14. By what percentage do you decrease radiation when you use a square collimator vs. RECTANGULAR Fogging 80% 15. Soft tissue & acrylic radio fairly radiolucent. 16. Bremsstrahlung radiation high-speed electrons interact w/ Tungsten nuclei. The electron loses kinetic energy, and this energy gets converted into photons. 17. Radiation film badge worn by employees whose work entails exposure to ionizing radiation. o Only used to measure occupational dose of radiation. 18. Cone cut X-ray machine is not lined up properly w/ the film. o The film/sensor should be perpendicular to the X-ray collimator. 19. Focal spot - -smaller -larger 20.20. o Smaller focal spot= better detail, definition, sharpness of the image o Larger focal spot= blurry, increased penumbra (unclear demarcation of the image outline/blurry