RADT_153_Unit_8_Exam

RADT_153_Unit_8_Exam - RADT 153 Image Analysis Unit 8 Exam...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: RADT 153 Image Analysis Unit 8 Exam The Effects of Filtration on Radiographic Quality 2 Directions: 1. Write your name and the date on your Scantron form. Identify the subject as the course number (for example, RADT 150) along with the test number (for example, Unit 1). 2. For each of the questions below, select the best answer to the question. 3. Using a No. 2 pencil, fill in the appropriate answer on the answer sheet. 4. Erase unwanted answers completely. Questions with two or more filled in answer spaces are graded as incorrect. 5. Answer all questions. 6. You have a maximum 15 minutes to complete the following 25 questions. (Note this time factor approximates the amount of time you would be allowed to answer the same number of questions on the Registry examination in radiography) -----------------------------------------------------------------------------------------1. This describes x-rays produced from the tube at any given instant that are not of the same wavelength: A. B. C. D. E. 2. Polychromatic Heterogeneous Short scale Long scale Penetration What is the average x-ray beam penetrating power primarily controlled by? A. B. C. D. E. mA mAs kVp SID filtration 3 3. Wavelengths with greater penetrating power are derived from __________ kVp and result in _________________ contrast.: A. B. C. D. E. 4. Wavelengths with less penetrating power are derived from ____________ kVp and result in __________________ contrast: A. B. C. D. E. 5. True False What do long wavelength photons contribute to? A. B. C. D. E. 7. Higher, shorter scale Lower, shorter scale Higher, longer scale Lower, longer scale Optimum, Optimum At a lower kVp, the average penetrating power is greater. A B. 6. Higher, shorter scale Lower, shorter scale Higher, longer scale Lower, longer scale Optimum, Optimum Faster exposure times Improved image quality Production of scatter Reduced absorbed dose Fog reduction Aluminum filters absorb the _________ energy x-rays while permitting most of the ________ energy x-rays to pass through. A. B. C. D. E. low, high low, low high, low high, high A and C 4 8. Which of the following is the kind of filtration attributed to the xray tube envelope? A. B. C. D. 9. The ______________ filtration tends to increase slightly as the tungsten filament and target are vaporized and deposited on the inner surface of the glass envelope. A. B. C. D. E. 10. 0.5 1.0 2.5 3.0 3.5 mm mm mm mm mm The thickness of a specific interposed substance that reduces the original exposure by half describes: A. B. C. D. E. 12. Coherent Added Inherent Aluminum Collimating How much aluminum must be used on procedures that use above 70 kVp? A. B. C. D. E. 11. Inherent Added Aluminum Collimation Collimator A wedge filter Half Value Layer Radioactive half life Square Law The relationship between filtration and radiographic density? A. B. C. None Direct Inverse 5 13. ________________ filters are most commonly constructed of an acrylic type plastic with small quantities of lead crystals. A. B. C. D. E. 14. With less filtration the beam is much more _________________. A. B. C. D. E. 15. True False A more homogeneous beam ________________ the difference between adjacent radiographic densities. A. B. C. 18. More x-rays reach the patient Compton scatter fogs the film Low energy x-rays are not attenuated All of the above None of the above Scattered interaction of the many high energy x-rays and atoms of the body part being radiographed causes the film to become fogged. A. B. 17. Harder Softer Homogeneous Heterogeneous Both B and C What happens with less filtration? A. B. C. D. E. 16. Collimating Aluminum Compensating Wedge Inherent increases decreases does not change The relationship between filtration and contrast is _________. A. B. C. None Direct Inverse 6 19. More filtration results in a longer scale of contrast while less filtration results in a shorter scale of contrast. A. B. 20. The relationship between filtration and the geometric properties of image details. A. B. C. 21. None Direct Indirect Changing filtration will make a difference in the visibility of the image but not in its geometry. A. B. 22. True False True False What will happen to the x-ray beam as filtration is increased? 1. 2. 3. 4. A. B. C. D. 23. Decreased scatter Increased scatter The beam will become more homogeneous The beam will become more heterogeneous 2 2 1 1 3 4 3 4 ___________ radiation is absorbed by the thinner end of a wedge filter so that ________ penetrating x-rays are available for denser tissues. A. B. 24. and and and and Less, more More, less The wedge filter is shaped like a wedge and is positioned in the beam so that the thinnest end of the wedge is over the thickest or densest end of the part. A. B. True False 7 25. One of the following does not result in filtering the x-ray beam. 1. 2. 3. 4. 5. Collimation X-Ray Tube Envelope Half Value Layer Lead shielding Distance A. B. C. D. E. 1 1, 1, 1, 1, 2 2, 3 2, 3, 4 2, 3, 4, 5 ...
View Full Document

Ask a homework question - tutors are online