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RHS practice exam
Studying for the DANB Radiation Health and safety cerification. (RHSPE)
| Question | Answer |
|---|---|
| What does radiolucent mean? | Structures allow x-rays to pass through and appear dark |
| What is the primary source of occupational radiation exposure for dental radiographers? | Scattered radiation |
| Which radiation is considered the most useful for producing a diagnostic image? | Primary beam |
| Which of the following appears radiolucent? | Air space |
| Which of the following appears radiopaque? | Enamel |
| Radiopaque structures on a radiograph appear: | White or light gray |
| What does contrast in a dental radiograph mean? | Difference between light and dark areas |
| What setting affects radiographic contrast? | kVp |
| Which is the most effective protective measure against radiation exposure? | Minimizing time, maximizing distance, and using shielding |
| If no barrier is available, the radiographer should: | Stand 6 feet away at a 45-degree angle |
| Handheld x-ray devices should only be used when: | Conventional machines are unavailable or impractical |
| A TLD dosimeter measures radiation exposure by: | Using crystals that emit light when heated |
| An OSL dosimeter differs from a TLD because it: | Uses optical stimulation |
| The maximum permissible dose (MPD) for radiation workers is: | 50 mSv/year |
| A 90 kVp setting produces: | Low contrast, many shades of gray |
| A 70 kVp setting produces: | High contrast, fewer shades of gray |
| What happens when kilovoltage is increased? | X-ray beam has more energy and penetrates tissue more |
| Why is proper contrast important in radiographs? | To see radiopaque, radiolucent, and gray areas clearly |
| Based on the recommendations for prescribing dental radiographs, a patient that has an existing dental implant will most likely be prescribed what type of radiographic images? | clinical judgement will be used |
| Density in dental radiography refers to: | Overall darkness of the image |
| What factor directly affects image density? | mA |
| When mA is increased, what happens? | Density increases (image darker) |
| Milliampere (mA) controls: | Number of x-rays produced |
| Which factor can make an image less dense? | Longer source-image distance |
| A very small patient requires: | Less radiation |
| Magnification in dental radiography refers to: | Enlargement of the image |
| What effect does a shorter PID have? | Increases magnification |
| A 25-year-old female recall patient comes 4 6-month check-up. her homecare is good, she has several restorations on molars and premolars. last radiographs were bitewings 7 years ago. What recommendation for radiographs for this patient? | full mouth radiographs |
| Which of the following is an example of a "symptom"? | pain |
| Which of the following is an example of a "sign"? | swelling |
| What effect does a longer PID have? | Decreases magnification |
| Sharpness of an image refers to: | Fine detail and outlines |
| What material is most commonly used to make the collimator? | Lead |
| Which is an example of a short-term radiation effect? | Radiation burns |
| What is a latent effect of radiation? | Appears years later |
| The fuzzy outline around an image is called: | Penumbra |
| What are the three factors that influence sharpness? | Focal spot size, image composition, movement |
| A small focal spot produces: | Sharper, more detailed images |
| A large focal spot produces: | Blurry images with loss of detail |
| What does patient movement during exposure cause? | Decreased sharpness |
| Distortion in a radiograph is caused by: | Incorrect vertical angulation |
| Elongation and foreshortening are examples of: | Distortion |
| What is the most important way to ensure that the patient receives a reasonably low dose of radiation? | use evidence-based selection criteria (use the recommendations for prescribing dental radiographs) |
| What is the purpose of using a lead apron? | Protect patient from scatter radiation |
| Which film shows crowns of upper and lower teeth in one image? | Bite-wing |
| Which film shows the whole tooth, from crown to root? | Periapical |
| Which exposure shows large areas of the maxilla or mandible? | Occlusal |
| How many periapical and bite-wing exposures are in an adult full-mouth survey? | 14 periapical and 4 bite-wing |
| What is diagnostic value in dental radiography? | The degree an image provides accurate and reliable information |
| Which patient factor influences radiation dose needed? | Body size |
| Which adjustment should be made for a husky patient compared to a small patient? | Increase exposure |
| What is the main purpose of adjusting exposure settings? | To obtain diagnostic images with proper density and contrast |
| Which intraoral technique requires 14 periapical and 4 bite-wing images for adults? | Full mouth survey |
| What does a long PID help reduce? | Magnification |
| What is the fuzzy shadow around an image called? | Penumbra |
| Which factor improves sharpness? | Small focal spot |
| What does distortion affect in an image? | Size and shape of teeth |
| Elongation of an image is caused by: | Insufficient vertical angulation |
| Foreshortening of an image is caused by: | Excessive vertical angulation |
| What is the purpose of headrest adjustment? | To stabilize the patient's head for accurate exposures |
| What should be removed before dental x-ray exposure? | Dentures and piercings |
| Which radiation safety device protects the thyroid gland? | Lead apron with collar |
| The difference between radiolucent and radiopaque areas is called: | Contrast |
| What does mA primarily control? | Number of x-rays produced |
| What does kVp primarily control? | Contrast and energy of the beam |
| A radiograph that is too light may be due to: | Low mA or short exposure time |
| A radiograph that is too dark may be due to: | High mA or long exposure time |
| Which of the following increases patient exposure unnecessarily? | Retaking radiographs due to errors |
| The overall blackness of a radiograph is: | Density |
| Why is patient movement a problem during x-ray exposure? | It decreases sharpness and blurs the image |
| Which setting should be adjusted first for a very small child? | Decrease exposure time and mA |
| Which of the following is a geometric characteristic of radiographs? | Magnification Sharpness Distortion All of the above |
| What is the main purpose of using correct exposure settings? | Produce diagnostic quality images |
| Which of the following provides the most diagnostic value? | Image with correct density, contrast, sharpness, and minimal distortion |
| A patient is scheduled for a full mouth series of radiographs. The dental assistant ensures the lead apron and thyroid collar are placed correctly. Which principle is being applied? | ALARA Principle |
| When taking a periapical radiograph, the patient suddenly moves. What type of error may occur? | Blurred image |
| During a recall visit, a 10-year-old with transitional dentition and moderate caries risk comes in. What is the recommended radiographic interval? | Every 6–12 months |
| What is the correct action for the dental assistant? | Document the refusal in the patient's chart |
| A new adult patient presents with generalized periodontal disease and history of extensive dental treatment. Which radiographic exam is best? | Full mouth intraoral series |
| Which of the following is most sensitive to radiation? | Bone marrow |
| During exposure, the dental assistant steps 3 feet closer to the x-ray tubehead. How will this affect radiation dose? | Dose increases |
| Which of the following tissues is least sensitive to radiation? | Mature bone |
| Which of the following reduces patient exposure the most? | Long PID with rectangular collimator |
| What is the main purpose of a thyroid collar? | To protect the thyroid gland |
| What step should be taken if a patient expresses concern about radiation safety? | Reassure them using facts about ALARA and modern safety measures |
| Which of the following best describes secondary radiation? | Radiation that escapes in all directions after the primary beam hits matter |
| A 45-year-old adult patient with no clinical caries and low risk presents for recall. According to ADA guidelines, how often should bitewings be taken? | Every 24–36 months |
| Which step best reduces patient exposure to unnecessary radiation? | Use lead apron with thyroid collar |
| Which tissue is the most radiosensitive? | Thyroid gland |
| Which of the following devices monitors cumulative radiation exposure of dental staff? | Dosimeter badge |
| Using a long PID (position indicating device): | Decreases magnification and improves image |
| When should radiographs be prescribed according to ADA guidelines? | Only when clinically justified after exam and history |
| A 7-year-old child with primary dentition comes in for their first visit. There are no clinical signs of caries. What should the dentist prescribe? | No radiographs unless surfaces cannot be visualized/probed |
| An adolescent with permanent dentition (no third molars yet) presents with multiple large restorations and history of caries. Which exam is most appropriate? | Individualized radiographic exam with bitewings and selected periapicals |
Created by:
banaezam
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