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RAD 147 Chap 11

RAD 147 Chap 11 review

QuestionAnswer
Which of the following will increase the amount of scatter radiation produced? Decreasing the x-ray field size. Increasing the x-ray field size. Increasing the grid ratio. Decreasing the grid ratio. Increasing the x-ray field size.
A lower-than-required mAs produces an image with __________ quantum noise, and a __________-than-needed mAs which exposes the patient to unnecessary radiation. decreased; lower increased; higher decreased; higher increased, lower increased; higher
As the mAs is decreased, the amount of radiation reaching the IR is _________ proportionally. increased decreased decreased
A diagnostic image was created using a 12:1 grid and 70 kVp at 10 mAs. What exposure technique change would maintain a similar exposure to the image receptor when removing the grid? 60 kVp @ 5 mAs. 70 kVp @ 2 mAs. 81 kVp @ 10 mAs. 60 kVp @ 50 mAs. 70 kVp at 2 mAs.
As collimation increases, the quantity of scatter radiation decreases. True False True
What type of relationship does mAs have with the exposure reaching the image receptor? a. direct b. inverse c. direct proportional d. inverse proportional c. direct proportional
Which of the following describes the relationship between mA and time to maintain exposure to the image receptor? a. direct b. inverse c. direct proportional d. inverse proportional d. inverse proportional
Increasing the mAs (within reason) has __________ effect on brightness displayed in digital imaging. a. direct b. proportional c. inverse d. no d. no
Given the anatomic part is adequately penetrated, changing the kVp will affect: a. brightness. b. Compton scattering. c. subject contrast. d. b and c. d. b and c.
The amount of remnant radiation will decrease when increasing: a. focal spot size. b. tissue thickness. c. mAs. d. kVp. b. tissue thickness.
A image was produced using 70 kVp, 15 mAs at 40-inch SID. Which of the following techniques would maintain the exposure to the image receptor when decreasing the SID to 30 inches? 80 kVp @ 15 mAs 70 kVp @ 8.4 mAs 70 KVp @ 11.3 mAs 60 kVp @ 27 mAs 70 kVp @ 8.4 mAs
What factor affects the amount of radiation intensity and scatter reaching the image receptor, magnification, and spatial resolution? a. OID b. SID c. grid ratio d. beam restriction a. OID
A image is created using 80 kVp, 10 mAs, and a grid ratio of 12:1. Which of the following exposure techniques would maintain exposure to the image receptor when the grid is removed? 68 kVp @ 10 mAs 80 kVp @ 2 mAs 92 kVp @ 5 mAs 80 kVp @ 50 mAs 80 kVp @ 2 mAs
What is the magnification factor when using a 72-inch SID and 1.5-inch OID? a. 0.979 b. 1.021 c. 1.5 d. 2.0 b. 1.021
How is the beam affected when increasing the tube filtration? increase in the number of x-ray photons increase in the proportion of lower-energy x-rays increase in the proportion of higher-energy x-rays increase in the speed of the x-ray photons increase in the proportion of higher-energy x-rays
The exposure indicator value reflects excessive exposure to the IR. Which of the following is the best for correcting the exposure error? A. Decrease kVp by 50% B. Increase mAs by 15% C. Decrease mAs by 50% D. Decrease mAs by 15% C. Decrease mAs by 50%
Which of the following would maintain radiation exposure to the IR when the kilovoltage is decreased by 15%? A. Increase mAs by 15%. B. Increase mAs by 50%. C. Double the mAs. D. Halve the mAs. C. Double the mAs.
An image is produced using 70 kVp and 25 mAs at a 40-inch SID. What change in the technique is necessary to maintain radiation exposure to the IR when the SID is increased to 56 inches? 60 kVp @ 25 mAs 70 kVp @ 12.5 mAs 70 kVp @ 50 mAs 60 kVp @ 50 mAs 70 kVp @ 50 mAs
Without exposure technique compensation, increasing the OID by 4 for a knee film image would 1. increase magnification. 2. decrease exposure to IR. 3. increase contrast. A. 1 and 2 only B. 1 and 3 only C. 2 and 3 only D. 1, 2, and 3 D. 1, 2, and 3
An image is produced using 80 kVp at 10 mAs with a 6:1 ratio grid. Calculate the change in technique to maintain radiation exposure to the IR when changing to a 12:1 ratio grid. A. 80 kVp @ 17 mAs B. 68 kVp @ 20 mAs C. 80 kVp @ 6 mAs D. 92 kVp @ 5 mAs A. 80 kVp @ 17 mAs
Which of the following factors does not affect the radiation exposure to the IR? A. Collimation B. Focal spot size C. Compensating filters D. Body habitus B. Focal spot size
What exposure factor change is recommended to maintain radiation exposure to the IR when increasing the patient thickness by 5 cm? A. Double the kVp B. Double the mAs C. Decrease kVp by 15% D. Increase mAs by 15% B. Double the mAs
Created by: drocco25
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