BDA RADIOGRAPHY AND RADIOLOGY EXAM
SCRIPT 2026 FULL QUESTIONS AND CORRECT
ANSWERS 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
SCRIPT 2026 FULL QUESTIONS AND CORRECT
ANSWERS 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
