Test Bank For Patient Care in Radiography: With an Introduction to Medical Imaging, 9th Edition

Chapter 02: Image Quality Factors Ehrlich: Patient Care in Radiography: With an Introduction to Medical Imaging, 9th Edition MULTIPLE CHOICE 1. An x-ray exposure is made using the following factors: 200 mA, 0.04 seconds, 80 kVp, and 48 inches SID. In this case, which represents the value of the mAs? a. 0.08 b. 0.8 c. 8 d. 16,000 ANS: C REF: p. 22 OBJ: 3 2. An increase in OID will result in: 1. increased magnification. 2. decreased image detail. 3. increased image detail. a. 1 only b. 2 only c. 1 and 2 d. 1 and 3 ANS: C REF: p. 30 OBJ: 6 3. The primary purpose of intensifying screens is to: a. protect the film from light and damage during radiography. b. improve the definition on the radiograph. c. reduce the quantity of radiation required to produce a satisfactory image. d. reduce the possibility of artifacts on the film. ANS: C REF: p. 25 OBJ: 8 4. In order to increase the penetration of the x-ray beam, which of the following factors should be increased? a. Kilovoltage b. Milliamperage c. mAs d. Exposure time ANS: A REF: p. 28 OBJ: 4 5. In order to increase optical density of a film/screen image, which of the following factors should be increased? a. Kilovoltage b. SID c. mAs d. OID ANS: C REF: p. 27 OBJ: 3 6. Magnification is affected by: a. OID only. b. SID only. c. both OID and SID. d. neither OID nor SID. ANS: C REF: p. 29 OBJ: 4 | 6 | 7 7. An image receptor that contains a photostimulable plate that is converted to an image by processing with a laser is part of a system called: a. digital radiography (DR). b. computed radiography (CR). c. a film/screen system. d. digital fluoroscopy. ANS: B REF: p. 26 OBJ: 8 8. Radiation exposure is directly proportional to: a. OID. b. kVp. c. mAs. d. SID. ANS: C REF: p. 22 OBJ: 3 9. An image that is black in the darkest areas and white in the lightest areas is said to have: a. high contrast. b. sharp detail. c. low contrast. d. poor detail. ANS: A REF: p. 31 OBJ: 10 10. To decrease the contrast on a radiographic image, you should: a. increase the kVp. b. decrease the kVp. c. increase the exposure time. d. decrease the mAs. ANS: A REF: p. 28 OBJ: 4 11. An increase in kVp affects the x-ray beam by causing it to: a. have greater intensity. b. be more homogeneous. c. cover a larger area. d. contain more long wavelengths. ANS: A REF: p. 23 12. Image detail is affected by: a. mAs and kVp b. kVp and SID OBJ: 4 c. focal spot size and patient motion d. focal spot size and mAs ANS: C REF: p. 28 OBJ: 12 13. When a radiographic image is visible immediately after exposure, without the need for processing, the image receptor system is of the type called: a. digital radiography (DR). b. computed radiography (CR). c. fluoroscopy. d. film/screen radiography. ANS: A REF: p. 27 OBJ: 8 14. When a large OID causes poor image detail, this can be compensated to some degree by increasing the: a. kVp. b. SID. c. mAs. d. field size. ANS: B REF: p. 28 OBJ: 7 | 12 15. When a change in SID necessitates a change in another factor in order to maintain image quality, the factor used to compensate is: a. kVp. b. SID. c. mAs. d. field size. ANS: C REF: p. 24 OBJ: 7 16. What is the effect of grid use on image quality, as compared to an exposure made without a grid? a. Contrast is increased. b. Optical density is increased. c. Image detail is increased. d. Image distortion is decreased. ANS: A REF: p. 27 OBJ: 11 17. Unequal magnification of various portions of the radiographic subject affects the image factor called: a. optical density. b. image contrast. c. image detail. d. shape distortion. ANS: D REF: p. 30 OBJ: 9