Chapter 22 - Diagnostic Imaging UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Radiology - CORRECT ANSWER - The study of the uses of radioactive substances for
visualizing the internal structures of the body in order to diagnose and treat disease. It is divided
into three specialties: diagnostic radiology, radiation therapy, and nuclear medicine.
X-ray - CORRECT ANSWER - An electromagnetic wave with a high energy level and
short wavelength that can penetrate solid objects. X-rays can be used in diagnosis and therapy
Digital X-ray - CORRECT ANSWER - A form of X-ray imaging in which digital X-ray
sensors are used instead of traditional photographic film. They reduce processing time and also
require less radiation to produce images.
Magnetism - CORRECT ANSWER - The ability of certain materials to attract iron and
other metals.
Radioactive - CORRECT ANSWER - Capable of emitting radiant energy; or giving off
radiation as the result of the disintegration of the nucleus of an atom.
Nuclear energy - CORRECT ANSWER - Energy produced by fission of an atomic
nucleus.
Radiopaque - CORRECT ANSWER - Refers to something that does not permit the
passage of X-rays. Bones are relatively radiopaque
Contrast media - CORRECT ANSWER - Radiopaque substances used in radiography to
permit visualization of internal structures.
-Contrast media include liquids, powders, and gases. They are administered orally, parenterally,
and rectally.
, -A positive contrast medium is more dense than the surrounding tissue. Barium sulfate and
iodine are positive contrast media.
-A negative contrast medium is less dense than the surrounding area in the body. Air is a negative
contrast medium.
Adverse effects of contrast media - CORRECT ANSWER - Oral agents may cause skin
rash, vomiting, diarrhea, abdominal pain, or constipation. IV agents can cause urticaria (rash),
skin reddening, anaphylaxis, or death. Some individuals have allergies to iodine.
X-ray film - CORRECT ANSWER - A special material with a sensitive emulsion layer that
reacts when it is exposed to radiation and thereby produces an image. Single-emulsion film is
used to create images of the extremities and the breasts.
Radiograph - CORRECT ANSWER - An image recorded on film that has been exposed.
An older term for radiograph is roentgenogram, named after the discoverer of X-rays, Wilhelm
Conrad Roentge
Film fog - CORRECT ANSWER - An unwanted increase in the density of the emulsion
either before or after exposure to radiation. Heat, light, chemicals, and extraneous radiation can
produce fogging, which appears as darkened areas on the finished radiograph.
Artifacts - CORRECT ANSWER - Extraneous marks and areas of increased or decreased
density on film. Artifacts interfere with the diagnostic value of the radiograph.
Cassette - CORRECT ANSWER - A light-proof container that holds X-ray film and serves
to intensify the image.
Contrast - CORRECT ANSWER - The visible difference between any two areas of
radiographic density.
Roentgen - CORRECT ANSWER - A unit used to measure X-ray dosage in air.
ACTUAL Exam Questions and CORRECT
Answers
Radiology - CORRECT ANSWER - The study of the uses of radioactive substances for
visualizing the internal structures of the body in order to diagnose and treat disease. It is divided
into three specialties: diagnostic radiology, radiation therapy, and nuclear medicine.
X-ray - CORRECT ANSWER - An electromagnetic wave with a high energy level and
short wavelength that can penetrate solid objects. X-rays can be used in diagnosis and therapy
Digital X-ray - CORRECT ANSWER - A form of X-ray imaging in which digital X-ray
sensors are used instead of traditional photographic film. They reduce processing time and also
require less radiation to produce images.
Magnetism - CORRECT ANSWER - The ability of certain materials to attract iron and
other metals.
Radioactive - CORRECT ANSWER - Capable of emitting radiant energy; or giving off
radiation as the result of the disintegration of the nucleus of an atom.
Nuclear energy - CORRECT ANSWER - Energy produced by fission of an atomic
nucleus.
Radiopaque - CORRECT ANSWER - Refers to something that does not permit the
passage of X-rays. Bones are relatively radiopaque
Contrast media - CORRECT ANSWER - Radiopaque substances used in radiography to
permit visualization of internal structures.
-Contrast media include liquids, powders, and gases. They are administered orally, parenterally,
and rectally.
, -A positive contrast medium is more dense than the surrounding tissue. Barium sulfate and
iodine are positive contrast media.
-A negative contrast medium is less dense than the surrounding area in the body. Air is a negative
contrast medium.
Adverse effects of contrast media - CORRECT ANSWER - Oral agents may cause skin
rash, vomiting, diarrhea, abdominal pain, or constipation. IV agents can cause urticaria (rash),
skin reddening, anaphylaxis, or death. Some individuals have allergies to iodine.
X-ray film - CORRECT ANSWER - A special material with a sensitive emulsion layer that
reacts when it is exposed to radiation and thereby produces an image. Single-emulsion film is
used to create images of the extremities and the breasts.
Radiograph - CORRECT ANSWER - An image recorded on film that has been exposed.
An older term for radiograph is roentgenogram, named after the discoverer of X-rays, Wilhelm
Conrad Roentge
Film fog - CORRECT ANSWER - An unwanted increase in the density of the emulsion
either before or after exposure to radiation. Heat, light, chemicals, and extraneous radiation can
produce fogging, which appears as darkened areas on the finished radiograph.
Artifacts - CORRECT ANSWER - Extraneous marks and areas of increased or decreased
density on film. Artifacts interfere with the diagnostic value of the radiograph.
Cassette - CORRECT ANSWER - A light-proof container that holds X-ray film and serves
to intensify the image.
Contrast - CORRECT ANSWER - The visible difference between any two areas of
radiographic density.
Roentgen - CORRECT ANSWER - A unit used to measure X-ray dosage in air.
