B - answer-The use of contrast material as a means for visualizing human anatomy has a long history. Regardless of the type of contrast media, the purpose for using contrast media is to:
a. increase patient radiation dose and improve image quality.
b. enhance the low subject contrast of anatomic ...
RADT1001; Ch 23 Test bank
B - answer-The use of contrast material as a means for visualizing human
anatomy has a long history. Regardless of the type of contrast media, the
purpose for using contrast media is to:
a. increase patient radiation dose and improve image quality.
b. enhance the low subject contrast of anatomic structures.
c. increase metabolism of the kidneys and liver.
d. improve the contrast between high contrast structures such as bone.
C - answer-Contrast agents can be generally classified as:
a. ionic and nonionic.
b. metallic and nonmetallic.
c. positive and negative.
d. aqueous and lipid based.
C - answer-Generally speaking, radiographic images are the result of x-ray
photons being absorbed to varying degrees based on tissue density and
thickness. There are five radiographic densities seen on radiographs: air or
gas, water, fat, mineral, and metal. The lowest subject contrast between
these five densities is between:
a. bone and air.
b. water and mineral.
c. water and fat.
d. metal and air.
B - answer-Negative contrast agents:
a. appear white on images.
b. have low atomic numbers.
c. provide high x-ray beam attenuation and absorption.
d. are materials such as bone and metal.
D - answer-Positive contrast agents:
a. have high atomic numbers.
b. appear white on radiographs because of the degree of attenuation.
c. have a tendency to absorb x-ray photon energy to a great extent.
d. All of the above are correct.
D - answer-An air-contrast colon study would be an example of:
a. a high-contrast examination.
b. the use of both a negative and a positive contrast agent on the same
image.
c. a barium sulfate and air examination.
d. all of the above.
, C - answer-A common contrast agent used for MRI examinations is:
a. ultrasonic microbubbles.
b. barium sulfate.
c. gadolinium-DTPA.
d. triiodinated thorium.
A - answer-For select examinations, air (negative contrast) and radiopaque
contrast are used as a pair to outline mucosal linings, joint interspaces, and
passageways. These examinations are considered:
a. double-contrast studies.
b. extremely dangerous and rarely done.
c. single-contrast exams.
d. low-contrast studies.
A - answer-All of the following are true of barium sulfate as a contrast agent
EXCEPT:
a. when mixed with water it dissolves completely.
b. its atomic number (Z) is 56.
c. it is chemically inert.
d. to prevent flocculation, barium sulfate is often mixed with water and
sodium citrate
B - answer-Barium sulfate would be contraindicated for a patient with:
a. colonic polyps.
b. a suspected duodenal bulb perforation.
c. diverticulosis.
d. all of the above.
D - answer-Stomach examinations using barium sulfate have some degree of
risk for patients who are:
a. sedated.
b. mentally handicapped.
c. potentially hypovolemic.
d. all of the above.
C - answer-Most adverse reactions to ionic, iodinated contrast agents are
caused by:
a. their pH.
b. their hydrogen concentration.
c. their osmolality.
d. the presence of iodine
D - answer-An undesirable characteristic of ionic contrast agents is their:
a. inertness.
b. neutral osmolality.
c. neutral pH.
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