DANB RADIOLOGY EXAM QUESTIONS AND ANSWERS ALL CORRECT
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DANB RADIOLOGY
DANB RADIOLOGY EXAM QUESTIONS AND ANSWERS ALL CORRECT
What is the bremsstrahlung radiation - Answer-aka general radiation; stopping or slowing of the electrons of the cathode stream as they collide with the nuclei of the target atoms
What is the collimator made out of? - Answer-Lead
What is ...
DANB RADIOLOGY EXAM
QUESTIONS AND
ANSWERS ALL CORRECT
What is the bremsstrahlung radiation - Answer-aka general radiation; stopping or
slowing of the electrons of the cathode stream as they collide with the nuclei of the
target atoms
What is the collimator made out of? - Answer-Lead
What is the earliest sign of radiation exposure? - Answer-erythema
What is the emulsion composed of? - Answer-gelatin and silver halide crystals
What is the Latent image? - Answer-invisible image (remains like this until film is
processed)
What is the latent period - Answer-time between exposure and 1st clinically observable
symptoms
What is the main source of radiation exposure to the operator? - Answer-
scatter/secondary radition
What is the main difference between particulate and electromagnetic radiation? -
Answer-Particulate radiation is made out of protons, neutrons electrons and alpha and
beta particles and has mass
Electromagnetic radiation is made out of protons and has no mass
What is the major use of cross-sectional occlusal radiograph? - Answer-provides more
info. about the location of tori, impacted and malpositioned teeth and the calcification of
soft tissues
What is the major use of topographical occlusal radiographs? - Answer-images
conditions of the teeth and supporting structures when a larger area than a PA is
needed; provides more info. than a PA about the alveolar crest and apical areas
What is the maximum permissible dose for radiation workers in system international
units? - Answer-50 mSv (5 REM)
,What is the maximum size of the x-ray beam at the patient's face? - Answer-2.75 inches
What is the most commonly used personnel monitoring device for dental offices? -
Answer-film badge
What is the most important step in a panoramic radiograph? - Answer-Patient
positioning
What is the most likely cause of a film with very poor definition? - Answer-patient
movement
What is the name for the part of the Target that is struck by electrons - Answer-focal
spot
What is the optimum processing temperature in manual process? - Answer-68°F
What is the primary beam? - Answer-original, undeflected, useful beam
What is the proper patient position for bitewings? - Answer-ALA-tragus line is parallel to
the floor
What is the purpose of a panoramic? - Answer-Image the entire dentition, surrounding a
viola bone, sinuses, and the TMJ, examine large area of face and jaws, locate impacted
teeth, retain root tips, evaluate trauma, lesions, and diseases, and assess growth and
development
What is the purpose of a collimation? - Answer-reduce size and shape of beam
What is the purpose of filtration? - Answer-absorb long wavelengths / soft radiation
What is the purpose of replenishing the developer solution? - Answer-maintain acidity &
alkalinity & prevent oxidation,
What is the purpose of taking radiographs of an edentulous patient? - Answer--detect
pathological lesions
-establish position of mental foramen
-establish position of mand canal
-determine quality & quantity of alveolar bone present
What is the purpose of the embossed dot - Answer-to distinguish b/w patient's right and
left side
What is the purpose of the lead foil? - Answer-absorb scatter radiation and prevent
fogging
, 3 film holding devices used for bisecting - Answer-dentsply rinn stabe, rinn BAI, dental
SUPA
3 film holding devices used for paralleling - Answer-dentsply rinn XCP-DS, Rinn XCP,
flow dental RAPD
a patient complains of pain in the upper molar region. What radiographic exposure
should be made? - Answer-periapical
a properly exposed film appears completely black. when was it exposed to white light? -
Answer-before it was processed
According to the principles of shadow casting, preferred object, film distances - Answer-
As close as possible to
According to principles of shadow casting, how should the central beam be directed? -
Answer-Perpendicular to the tooth and film
According to the principles of shadow casting, how should the film be placed in relation
to the tooth? - Answer-parallel
According to principles of shadow casting what is the preferred source object distance?
- Answer-As far as practical
After processing exposed dental film, you noticed dark spots on the film. What caused
this? - Answer-Premature contact with the developer
An insurance company request a patient's radiographs when examining a dental claim
you only have one copy of the radiographs. what should you duplicate and which should
go to the insurance company? - Answer-Duplicate, which will go to the insurance
company.
The office keeps the best copy
Desired thickness of lead apron - Answer-.25 mm
Difference between direct and indirect exposure sensor - Answer--Direct means directly
obtaining a digital image by exposing intraoral sensor to x-rays to provide an image that
can be viewed on a computer.
-indirect is photostimuble phosphor plate sensor technology, obtaining a digital image in
which an exposed phosphor plate is placed into a scanner and then converted into a
digital image.
Explain PSP - Answer--Photostimuable Phosphor Plate aka storage phosphor system
-indirect digital imaging
-captures analog data then processed in a laser scanning device
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