DASA Radiography Exam Questions
and Answers
What is stray radiation? - Answer-All radiation other than the primary beam.
What causes stray radiation in an x-ray tube? - Answer-Electrons hitting the glass wall
and other parts of the x-ray tube.
Bisecting Technique - Answer-Used to capture SPECIFIC or UNIQUE Radiographs.
What is the Paralleling Technique used for? - Answer-Exposing PARIAPICAL AND
BITEWING RADIOGRAPHS
How should the film and teeth be positioned in the Paralleling Technique? - Answer-
Parallel to each other
How is the x-ray beam directed in the Paralleling Technique? - Answer-Perpendicular to
the line created by the teeth and film
Holders Used for the Paralleling Technique - Answer-the function of the film holder is to
hold the x-ray film away from the lingual surface of the teeth and parallel to the long axis
of the teeth
Periapical Radiographs - Answer-Captures the ENTIRE TOOTH and surrounding area.
The radiographs can be used to assess the health of the teeth and surrounding tissues.
What do Bitewing Radiographs capture? - Answer-The crowns of the teeth,
interproximal spaces, and the crest of the bone of maxillary and mandibular teeth.
What are Bitewing Radiographs used to detect? - Answer-Caries, calculus, and to
measure the crestal height of the alveolar bone.
Panorex Radiographs - Answer-Captures large areas of the maxillary or mandibular
arch. These radiographs can be USED ALONE.
Full Mouth Radiographic Survey (FMX) - Answer-A typical adult FMX will include
fourteen periapical and four bitewing films (18 total)
, Dental Radiograph - Answer-Representation of a three dimensional object used in
dentistry to study and identify structures NOT VISIBILE TO THE NAKED EYE.
Radiography - Answer-Applying the basic sciences of PHYSICS AND CHEMISTRY as
they relate to photography.
Wilhelm Conrad Roentgen - Answer-German physicist, discovered x-rays in 1895. X-
rays are sometimes called "Roentgen Rays".
Otto Walkhoff - Answer-Made the FIRST DENTAL RADIOGRAPH in 1896 and
experimented on himself.
Who was C. Edmund Kells? - Answer-First practitioner to take dental radiograph on a
LIVE PATIENT.
What happened to C. Edmund Kells due to his experiments? - Answer-He repeatedly
experimented on his hand which led to cancer. He eventually had his arm amputated.
William Coolidge - Answer-Invented the X-RAY TUBE in 1913.
What are X-Rays? - Answer-Electromagnetic rays that are not detected by any of the
senses.
How fast do X-Rays travel? - Answer-X-Rays travel at the speed of light, which is
186,000 miles per second.
Primary Radiation - Answer-Also known as DIRECT BEAM or PRIMARY BEAM.
What is remnant radiation? - Answer-All of the radiation that reaches the x-ray film
passing through the object being radiographed.
What does remnant radiation produce? - Answer-The latent image, which is not visible
until the x-ray is processed.
What is a Secondary Remnant? - Answer-Results when primary radiation and the
atoms of an object it contacts interact.
What happens when primary radiation interacts with an object? - Answer-Some of the
primary beam will pass through an object without making contact while some will
Irradiate atoms within the object.
Scattered Radiation - Answer-Also known as SECONDARY RAYS, rays from the
primary beam that have been deflected by tissues or other objects.
Distortion - Answer-If the film is BENT of CURVED when placed into the mouth, the
image will appear DISTORED.
and Answers
What is stray radiation? - Answer-All radiation other than the primary beam.
What causes stray radiation in an x-ray tube? - Answer-Electrons hitting the glass wall
and other parts of the x-ray tube.
Bisecting Technique - Answer-Used to capture SPECIFIC or UNIQUE Radiographs.
What is the Paralleling Technique used for? - Answer-Exposing PARIAPICAL AND
BITEWING RADIOGRAPHS
How should the film and teeth be positioned in the Paralleling Technique? - Answer-
Parallel to each other
How is the x-ray beam directed in the Paralleling Technique? - Answer-Perpendicular to
the line created by the teeth and film
Holders Used for the Paralleling Technique - Answer-the function of the film holder is to
hold the x-ray film away from the lingual surface of the teeth and parallel to the long axis
of the teeth
Periapical Radiographs - Answer-Captures the ENTIRE TOOTH and surrounding area.
The radiographs can be used to assess the health of the teeth and surrounding tissues.
What do Bitewing Radiographs capture? - Answer-The crowns of the teeth,
interproximal spaces, and the crest of the bone of maxillary and mandibular teeth.
What are Bitewing Radiographs used to detect? - Answer-Caries, calculus, and to
measure the crestal height of the alveolar bone.
Panorex Radiographs - Answer-Captures large areas of the maxillary or mandibular
arch. These radiographs can be USED ALONE.
Full Mouth Radiographic Survey (FMX) - Answer-A typical adult FMX will include
fourteen periapical and four bitewing films (18 total)
, Dental Radiograph - Answer-Representation of a three dimensional object used in
dentistry to study and identify structures NOT VISIBILE TO THE NAKED EYE.
Radiography - Answer-Applying the basic sciences of PHYSICS AND CHEMISTRY as
they relate to photography.
Wilhelm Conrad Roentgen - Answer-German physicist, discovered x-rays in 1895. X-
rays are sometimes called "Roentgen Rays".
Otto Walkhoff - Answer-Made the FIRST DENTAL RADIOGRAPH in 1896 and
experimented on himself.
Who was C. Edmund Kells? - Answer-First practitioner to take dental radiograph on a
LIVE PATIENT.
What happened to C. Edmund Kells due to his experiments? - Answer-He repeatedly
experimented on his hand which led to cancer. He eventually had his arm amputated.
William Coolidge - Answer-Invented the X-RAY TUBE in 1913.
What are X-Rays? - Answer-Electromagnetic rays that are not detected by any of the
senses.
How fast do X-Rays travel? - Answer-X-Rays travel at the speed of light, which is
186,000 miles per second.
Primary Radiation - Answer-Also known as DIRECT BEAM or PRIMARY BEAM.
What is remnant radiation? - Answer-All of the radiation that reaches the x-ray film
passing through the object being radiographed.
What does remnant radiation produce? - Answer-The latent image, which is not visible
until the x-ray is processed.
What is a Secondary Remnant? - Answer-Results when primary radiation and the
atoms of an object it contacts interact.
What happens when primary radiation interacts with an object? - Answer-Some of the
primary beam will pass through an object without making contact while some will
Irradiate atoms within the object.
Scattered Radiation - Answer-Also known as SECONDARY RAYS, rays from the
primary beam that have been deflected by tissues or other objects.
Distortion - Answer-If the film is BENT of CURVED when placed into the mouth, the
image will appear DISTORED.
