Dental Radiography principals and Techniques 5th edition by Joen Iannucci
Dental Radiography principals and Techniques 5th edition by Joen Iannucci
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Chapter 20: Exposure and Technique Errors
Complete Chapter Questions With Answers
Sample Questions Are Posted Below
MULTIPLE CHOICE
| a. | clear. |
| b. | black. |
| c. | dark. |
| d. | light. |
ANS: A
An unexposed film appears clear.
DIF: Recall REF: Page 214 OBJ: 2
TOP: CDA, RHS, I.C.1.c. Identify and correct errors related to radiographic processing
MSC: NBDHE, 2.3 Technique
| a. | Excessive exposure time |
| b. | Failure to turn on the x-ray machine |
| c. | Excessive kilovoltage |
| d. | Excessive milliamperage |
ANS: B
Failure to turn on the x-ray machine may be the cause of an unexposed film or receptor; excessive exposure time would create a film that appears dark; excessive kilovoltage would create a film or receptor that appears dark; excessive milliamperage would create a film or receptor that appears dark.
DIF: Recall REF: Page 214 OBJ: 2
TOP: CDA, RHS, I.C.1.c. Identify and correct errors related to radiographic processing
MSC: NBDHE, 2.3 Technique
| a. | An unexposed film |
| b. | A film exposed to light |
| c. | An overexposed film |
| d. | An underexposed film |
ANS: B
A film exposed to light would most likely appear black; an unexposed film would be clear; an overexposed film would appear dark, and with sufficient exposure the darkness may approach that of a film exposed to light; an underexposed film would appear light.
DIF: Comprehension REF: Page 214 OBJ: 2
TOP: CDA, RHS, I.C.1.c. Identify and correct errors related to radiographic processing
MSC: NBDHE, 2.3 Technique
| a. | turning off the safelight and unwrapping the films in a pitch-black room. |
| b. | pre-exposing the entire package of film to radiation before opening the package. |
| c. | not unwrapping the film in a room with white light. |
| d. | turning off the fluorescent lighting in the treatment room before exposing radiographic films. |
ANS: C
The possibility of exposure of radiographic film to white light can be reduced by not unwrapping the film in a room with white light.
DIF: Comprehension REF: Page 215 OBJ: 2
TOP: CDA, RHS, I.C.1.c. Identify and correct errors related to radiographic processing | CDA, RHS, I.C.1.d. Identify and describe how to correct errors due to improper film handling
MSC: NBDHE, 2.3 Technique
| a. | insufficient exposure time. |
| b. | inadequate tissue density. |
| c. | excessive milliamperage. |
| d. | excessive kilovoltage. |
ANS: A
An underexposed receptor results from insufficient exposure time; manufacturers have titrated the properties of the film so that inadequate tissue density is not a possible factor; excessive milliamperage would create an overexposed film; excessive kilovoltage would create an overexposed film.
DIF: Comprehension REF: Page 216 OBJ: 2
TOP: CDA, RHS, I.C.1.c. Identify and correct errors related to radiographic processing
MSC: NBDHE, 2.3 Technique
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