Radiology #1 – Unidontia

1. Deterministic effects ____.

Show a severity of response proportional to dose

Are seen only in the oral cavity

Result from particulate radiation such as alpha and beta particles but not xrays

Are found after exposure to low levels of radiation

Question 1 of 20

2. the density or the overall darkening of the radiograph depends on all except

the quality and quantity of x rays

the thickness of the object

the velocity of electrons emitted from the cathode

the cone angulation

Question 2 of 20

3. the heel effect results

both of them are true

in low intensity x ray beam on anode side of central ray

none of the above are true

in high intensity beam of x ray towards cathode

Question 3 of 20

4. The term ALARA refers to

A legal requirement to optimize occupational exposure in dental radiology

As little as Roentgen allowed, an algorithm for limiting patient exposure

Reducing patient exposure to as low as is reasonably achievable

Optimizing image quality

Question 4 of 20

5. The odontogenic neoplasm, which is composed of loose, primitiveappearing connective tissue that resembles dental pulp, microscopically is known as _____.

Ameloblastic fibroma

Ameloblastoma

Odontogenic myxoma

Odontoma

Question 5 of 20

6. Elongation (the most common error) can be caused by

The film is not parallel to the long axis

All of the above

The occlusal plane is not parallel to the floor

Too little vertical angulation

Question 6 of 20

7. the speed with which electrons travel from the filament of the cathode to the target of the anode depends upon the

voltage in the filament circuit

angle between the filament and the target

potential difference between the two electrodes

number of milliamperes in the tube circuit

Question 7 of 20

8. What is the "critical target" for radiation damage

enzymes

Golgi apparatus

lysosomes

chromosomes

Question 8 of 20

9. Charge transferred across rows of detector in a 'bucket brigade ' fashion is seen in

PSP

CMOS

Flat panel detector

CCD

Question 9 of 20

10. If your film-based radiographs start coming out too light, it may be that the ______.

Fixer needs changing

Developer is too hot

Developer needs changing

Exposure time is too long

Question 10 of 20

11. Intranuclear viral inclusions are seen in tissue specimens of which of the following?

Hairy leukoplakia

Geographic tongue

Solar cheilitis

Minor aphthous ulcers

Question 11 of 20

12. A periapical image shows overlapped contacts. This error is caused by

Beam not centered over receptor

Incorrect horizontal angulation

Vertical angulation is insufficient

Vertical angulation is excessive

Question 12 of 20

13. While taking IOPA radiographs of maxillary 1st molar, to avoid superimposition of the zygomatic arch, the x ray tube should be angulated :

Distal with an increase in vertical angulation

Mesial with decrease in vertical angulation

Mesial

Distal

Question 13 of 20

14. In case of nasal fracture the following radiograph is used

OPG

Lateral skull view

Transorbital view

Submentovertex view

Question 14 of 20

15. a patient with a history of radiation therapy requires special consideration because

pla accumulation greater than normal can be expected

the potential for periodontal disease is greatly increased

the vascularity of bone may be disrupted

salivary function may be increased

Question 15 of 20

16. in radionucleotide imaging the most useful radio pharmaceutical for skeletal imaging is

technetium-99m

gallium 67

technetium -99m linked to methylene disphosphonate

technetium-sulphur colloid

Question 16 of 20

17. the density of a radiograph is reduced by increasing

source film distance

miliamperage

exposure time

kilovoltage

Question 17 of 20

18. Radiotherapy is not used in

Spindle cell carcinoma

Squamous cell carcinoma

Paget disease

Mucoepidermoid carcinoma

Question 18 of 20

19. A 21-year-old woman went to her dentist because of facial asymmetry. This asymmetry had developed gradually over 3 years. The patient had no symptoms. A diffusely opaque lesion was found in her right maxilla. All laboratory tests (complete blood count, alkaline phosphatase, calcium) were within normal limits. A biopsy specimen was interpreted as a fibro-osseous lesion. This patient most likely has ______.

Cherubism

Cementoblastoma

Fibrous dysplasia

Osteosarcoma

Question 19 of 20

20. Penny test is used for

Strength of developer

darkroom safe lighting

Personnel protection

Static electricity artifact

Question 20 of 20