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Radiography
Ch 22 Exposure and Technique Errors
| Question | Answer |
|---|---|
| How would an unexposed film appear? | Clear |
| Failure to turn on the x-ray machine could be the cause of | An unexposed film or receptor |
| How would a traditional film exposed to light appear? | Black |
| The possibility of exposure of radiographic film to white light can be reduced by | Not unwrapping the film in a room with white light. |
| An underexposed receptor results from | Insufficient exposure time. |
| What are some things that can be checked and increased as needed to prevent underexposure? | Exposure time, kilovoltage, milliamperage |
| The cause of an excessive margin of receptor edge (which appears as a black band) on a nondiagnostic periapical image is | The receptor was not positioned in the patient’s mouth to cover the apical regions of the teeth. |
| The teeth being imaged must be firmly in contact with the bite-block tp prevent what issue? | A dental image where apices do not appear on the film |
| What is the error when the occlusal plane appears tipped or tilted? | A dropped receptor corner. |
| Make certain the edge of the receptor is placed parallel to the incisal-occlusal surfaces of the teeth to prevent what error? | A dropped receptor corner |
| What is the cause of overlapped contacts on a dental image? | Incorrect horizontal angulation. |
| How can overlapped contacts be avoided on a periapical image? | Direct the x-ray beam through the interproximal regions |
| When the vertical angulation is excessive, how will the teeth appear on the image? | Short with blunted roots |
| When the vertical angulation is insufficient, how will the teeth appear on the image? | Long and distorted |
| How does a cone cut happen? | The PID was not properly aligned with the periapical receptor holder. |
| What is the best way to get the distal surfaces of the canines to be visible on a premolar bite-wing image? | Position the anterior edge of the receptor at the midline of the mandibular canine. |
| What is the best way to get the third molars to be visible on a molar bite-wing image? | Position the anterior edge of the receptor at the midline of the mandibular second premolar. |
| What causes an image to appear stretched and distorted? | Film bending |
| What causes a thin radiolucent line to appear on the film? | Film creasing |
| The appearance of a patient’s finger on the image is called a | Phalangioma |
| What is the cause of a double exposure? | The film was exposed in the patient’s mouth twice |
| How can a double exposure be avoided with traditional film and PSP plates? | Always separate exposed and unexposed film and PSP receptors |
| When there is patient movement, how will the image appear? | The image will be blurred |
| What can be done to prevent an image from being too light with a herringbone (tire-track) pattern? | When the film is reversed, make sure the film side is facing the PID. |
| How will an unexposed digital sensor appear? | Clear or blank |
| What is the issue if the mandibular incisors are foreshortened? | Vertical angulation needs to be decreased |
| If the maxillary premolars are elongated, how would the problem be corrected? | Increase vertical angulation. |
| If the mesial half of a bite-wing image is clear, what needs to be corrected to prevent this from reoccurring? | Adjust receptor position. |
| If overlapping is more excessive toward the mesial of a film than the distal of the film, what do you need to do to prevent this error on the retake? | Correct horizontal angulation, direct the PID more toward the distal |
| What do radiopaque artifacts or radiolucent scratch marks on a dental image indicate? | Debris accumulation on the sensor |
Created by:
BrendaAlberts