BDA RADIOGRAPHY AND RADIOLOGY
EXAMINATION TEST 2 2026 COMPLETE
QUESTIONS AND SOLUTIONS GRADED A+
◉ What does radiopaque mean? Answer: White areas where x-ray
photons have been totally absorbed by the patient
◉ What does mixture mean? Answer: Varying degrees of absorption
(grey colour)
◉ What is chemical processing? Answer: The process that converts
the invisible latent image into a visible black, white, grey image
◉ How far should you stand from x-ray equipment? Answer: At least
1.5-2m
◉ What do intensifying screens consist of? Answer: Fluorescent
phosphors embedded in a plastic matrix
◉ What do the phosphors in intensifying screens include? Answer:
Calcium tungstate and rare earth materials
,◉ What does D, E, F mean for an intra oral film? Answer: Speed of
the film
◉ What speed of film should used? Answer: E or F
◉ What must indirect-action films be used in conjunction with?
Answer: Intensifying screens
◉ Why are pixels on 2D images different shades? Answer: It
depends on the amount of radiation that hit the sensor
◉ What does CBCT stand for? Answer: Cone bean computed
tomography
◉ How does a CBCT machine work? Answer: Machine uses a
cylindrical or spherical part of the patient called field of view
◉ How much radiation do we receive naturally per year? Answer:
2.7 mSv
◉ What are the two main digital imaging systems? Answer: Solid
state receptors and phosphor plate receptors
◉ 2D images are made of what? Answer: Pixels
, ◉ How do solid state sensors work? Answer: The electronic
receptors produce in an instantaneous image, they convert x-ray
energy into electrical signals which are used to construct a digital
image
◉ How do phosphor plate receptors work? Answer: Receptors store
the image on a phosphor plate which is then scanned by a laser
reader. The reader converts the stored image into electrical signals
which are then constructed into a digital image
◉ What is periapical radiography? Answer: Radiograph that is
designed to show individual teeth and the tissues around the apicies
◉ What is the paralleling technique? Answer: A technique that
places the image receptor parallel to the long axis of the tooth
◉ What x-ray variable affects the degree of blackening of the
radiographic image? Answer: mA
◉ What is the bisected angle technique? Answer: When the x-ray
beam is aimed perpendicular to an imaginary line which bisects the
angle between the long axis of the image receptor and the tooth
EXAMINATION TEST 2 2026 COMPLETE
QUESTIONS AND SOLUTIONS GRADED A+
◉ What does radiopaque mean? Answer: White areas where x-ray
photons have been totally absorbed by the patient
◉ What does mixture mean? Answer: Varying degrees of absorption
(grey colour)
◉ What is chemical processing? Answer: The process that converts
the invisible latent image into a visible black, white, grey image
◉ How far should you stand from x-ray equipment? Answer: At least
1.5-2m
◉ What do intensifying screens consist of? Answer: Fluorescent
phosphors embedded in a plastic matrix
◉ What do the phosphors in intensifying screens include? Answer:
Calcium tungstate and rare earth materials
,◉ What does D, E, F mean for an intra oral film? Answer: Speed of
the film
◉ What speed of film should used? Answer: E or F
◉ What must indirect-action films be used in conjunction with?
Answer: Intensifying screens
◉ Why are pixels on 2D images different shades? Answer: It
depends on the amount of radiation that hit the sensor
◉ What does CBCT stand for? Answer: Cone bean computed
tomography
◉ How does a CBCT machine work? Answer: Machine uses a
cylindrical or spherical part of the patient called field of view
◉ How much radiation do we receive naturally per year? Answer:
2.7 mSv
◉ What are the two main digital imaging systems? Answer: Solid
state receptors and phosphor plate receptors
◉ 2D images are made of what? Answer: Pixels
, ◉ How do solid state sensors work? Answer: The electronic
receptors produce in an instantaneous image, they convert x-ray
energy into electrical signals which are used to construct a digital
image
◉ How do phosphor plate receptors work? Answer: Receptors store
the image on a phosphor plate which is then scanned by a laser
reader. The reader converts the stored image into electrical signals
which are then constructed into a digital image
◉ What is periapical radiography? Answer: Radiograph that is
designed to show individual teeth and the tissues around the apicies
◉ What is the paralleling technique? Answer: A technique that
places the image receptor parallel to the long axis of the tooth
◉ What x-ray variable affects the degree of blackening of the
radiographic image? Answer: mA
◉ What is the bisected angle technique? Answer: When the x-ray
beam is aimed perpendicular to an imaginary line which bisects the
angle between the long axis of the image receptor and the tooth
