MISCELLANEOUS MCQs _ Oral Radiology MCQs

MISCELLANEOUS MCQs _ Oral Radiology MCQs

1. The area from which X-rays emanate is called the
A. Target
B. Focal spot
C. Intensifying screen
D. Cone

2. The image of the coronoid process of the mandible often appears in periapical X-rays of
A. The incisor region of the mandible
B. The molar region of the mandible
C. The incisor region of the maxilla
D. The molar region of the maxilla

3. X-ray developer contains all of the following except
A. A developing agent
B. An antioxidant preservative
C. A clearing agent
D. An accelerator
E. A restrainer

4. X-ray fixer contains all of the following except:
A. A clearing agent
B. An antioxidant preservative
C. An accelerator
D. An acidifier
E. A hardener

5. After processing a film, you notice that it appears brown in color. What is the most likely cause?
A. Solutions are too strong
B. Solutions are too weak
C. Fixing time was not long enough
D. Fixing time was too long
E. Film was underdeveloped

6. The unit for measuring the absorption of X-rays is termed
A. REM
B. RAD
C. Roentgen
D. QF

7. Which of the following is considered radioresistant?
A. Immature reproductive cells
B. Young bone cells
C. Mature bone cells
D. Epithelial cells

8. It is recommended that the operator stand at least how many feet away from the patient when taking radiographs?
A. Two feet
B. Four feet
C. Six feet
D. Eight feet

9. The inverse square law formula is
A. New intensity Original distance² / Original intensity New distance²
B. New intensity New distance² / Original intensity Original distance²
C. Original intensity New distance² / New intensity Original distance²
D. None of the above

10. Increasing the kilovoltage (kVp) causes the resultant X-ray to have
A. Decreased density
B. More latitude
C. A shorter scale of contrast
D. A longer scale of contrast

11. The amount of material that is required to reduce the intensity of an X-ray beam to half is called the
A. Value layer
B. Intensity value layer
C. Half-value layer
D. Full-value layer

12. The radiation generated at the anode of the X-ray tube is called
A. Primary radiation
B. Scattered radiation
C. Potential radiation
D. Reverse radiation

13. The removal of parts of the X-ray spectrum using absorbing materials in the X-ray beam is called
A. Elimination
B. Filtration
C. Collimation
D. Reduction

14. The most effective means in reducing the time of exposure, the amount of radiation reaching the patient, and the amount of radiation scattered to the dentist is
A. A lead apron
B. Ekta-speed film
C. Lead diaphragms
D. Increasing target–film distance

15. The use of metal plates, slots, bars, etc., to confine a direct radiation (e.g., X-rays or gamma-rays) to a specific region and to discriminate against radiation from unwanted directions (e.g., scattered radiation) is called
A. Discrimination
B. Collimation
C. Filtration
D. Coning

16. Image magnification may be minimized by
A. Using a short cone
B. Placing the film as far from the tooth as possible
C. Using a long cone
D. Shortening the exposure time

17. Foreshortening and elongation are produced by
A. Incorrect horizontal angulation
B. Incorrect vertical angulation
C. Either of the above

18. Which of the following positioning errors is the most likely cause of the reverse occlusal plane curve in a panorex projection?
A. Chin tilted too far upward
B. Chin tilted too far downward
C. Head turned slightly

19. Which of the following is a major disadvantage of the paralleling technique?
A. The image formed on the film will not have dimensional accuracy
B. Due to the amount of distortion, periodontal bone height cannot be accurately diagnosed
C. An increase in exposure time is necessary due to the use of a long cone
D. An increase in exposure time is necessary due to the use of a short cone

20. Which of the following is not a disadvantage of the bisecting technique?
A. Image on X-ray film may be dimensionally distorted (amount may vary)
B. Increased exposure time
C. Due to the use of a short cone (which results in divergent rays), the image is not a true reproduction of the object
D. May not be able to judge the correct alveolar bone height

21. Which of the following projections is best for examination of fractures of the zygomatic arch?
A. Waters projection
B. Submentovertex projection
C. Reverse Towne projection
D. Lateral cephalometric projection

22. Which of the following projections is best for examination of the maxillary sinus?
A. Lateral jaw projection
B. Reverse Towne projection
C. Waters’ projection
D. Submentovertex projection

23. Which of the following projections is best for examination of the condyles and neck of the mandible (from an anterior-posterior projection)?
A. Waters projection
B. Transcranial projection
C. Townes’ projection
D. Submentovertex projection

24. All of the following are advantages of a panoramic radiograph except
A. It shows areas that may not be visible on a full mouth series
B. It shows both arches on the same film
C. It gives better detail and definition than periapical radiographs
D. It is more comfortable for the patient (eliminates gagging)
E. It requires less time than a full mouth series

25. A phenomenon caused by a relatively lower X-ray absorption on the mesial or distal aspect of teeth, between the edge of the enamel, and the adjacent crest of the alveolar ridge is called
A. Apical burnout
B. Cervical burnout
C. Coronal burnout
D. Root burnout

26. Which of the following types of intraoral radiographs are most useful in detecting interproximal caries?
A. Periapical radiographs
B. Bitewing radiographs
C. Occlusal radiographs

27. The period between radiation exposure and the onset of symptoms is called the
A. Latent period
B. Period of cell injury
C. Recovery period

28. Which type of digital image receptor is most common at this time?
A. CID (Charge Injection Device)
B. CMOS I APS (Complimentary Metal Oxide Semiconductor/Active Pixel Sensor)
C. CCD (Charge-Coupled Device)

29. All of the following are advantages of digital radiography except
A. Digital subtraction
B. The ability to enhance the image
C. Size of the intraoral sensor
D. Patient education

30. The method of obtaining a digital image similar to scanning a photograph to a computer screen is termed
A. Indirect digital imaging
B. Direct digital imaging
C. Storage phosphor imaging
D. CMOS/APS

31. Digital radiography requires less radiation than conventional radiography because
A. The sensor is larger
B. The exposure time is increased
C. The sensor is more sensitive to X-rays
D. The pixel’s sense transmitted light quickly

32. Which of the following errors in radiographic technique is the most likely reason that an image on a radiograph would appear elongated?
A. Too much vertical angulation
B. Too little vertical angulation
C. Incorrect horizontal angulation
D. Beam not aimed at center of film

33. A film badge is a type of
A. Identification plate
B. Sonometer
C. Dosimeter
D. Tachometer

34. Magnification can be reduced in X-ray by
A. Long cone
B. Short cone
C. Place film far from object and parallel
D. Reduce exposure time

35. The best radiographic view of lateral condyle is
A. Towne’s view
B. Reverse Towne’s view
C. Waters’ view
D. Caldwell’s view

36. Most common cause of break in canal seen on IOPA radiograph is
A. Calcification of canal
B. Merging of canal
C. Bifurcation of canal
D. Extra canal

37. Proximal caries are best detected by
A. Bitewing
B. Occlusal
C. IOPA
D. Panoramic

38. The size and shape of the X-ray beam is restricted by
A. Filter
B. Collimator
C. Film badge
D. E speed film

39. Use of F speed films reduces patient exposure by
A. 50% compared to E speed films
B. 75% compared to E speed films
C. 25% compared to E speed films
D. No reduction in exposure

40. The primary source of X-ray photons is
A. Bremsstrahlung radiation
B. Characteristic radiation
C. Coherent scattering
D. Compton scattering

41. Which of the following is used to estimate risk in human organs?
A. Effective dose
B. Exposure
C. Absorbed dose
D. Equivalent dose

42. Radiographic technique to detect salivary gland disease is called
A. Angiography
B. Computed tomography
C. Electrocardiogram
D. Sialography

43. Radiation caries is characteristically seen in
A. Occlusal fissures
B. Proximal surface
C. Incisal edges
D. Cervical third

44. The best radiograph for viewing of maxillary sinus is
A. Lateral oblique maxilla
B. Submentovertex
C. Waters’ view
D. Lateral skull

45. The standard size of adult IOPA film is
A. 22 x 30 mm
B. 31 x 41 mm
C. 31 x 40 mm
D. 22 x 40 mm

46. The zygomatic arches are best visualized on the
A. Submentovertex view
B. Waters’ view
C. Reverse Towne’s view
D. PA view

47. Least radiosensitive cells are
A. WBC, bone cells, cartilage
B. Muscle cell, nerve cell, bone cell
C. Connective tissue cell, endothelial cell, muscle cell
D. RBC, muscle cell, bone cell

48. Halo effect around root is seen in
A. Widened PDL
B. Horizontal root fracture
C. Periapical periostitis
D. Acute periapical abscess

49. A 30-year-old patient having chronic pain of long duration with radiographic appearance of endosteal bone formation. Diagnosis is
A. Acute osteomyelitis
B. Ewing’s sarcoma
C. Garre’s osteomyelitis
D. Chronic focal sclerosing osteomyelitis