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COMPUTED TOMOGRAPHY TEST PREP QUESTIONS AND ANSWERS
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COMPUTED TOMOGRAPHY TEST PREP QUESTIONS AND ANSWERS
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COMPUTED TOMOGRAPHY TEST PREPQUESTIONS AND ANSWERS
When completing a CT exam for post myelogram of the lumbar spine in an adult patient,
which of the following would be an acceptable range for contrast volume for the
intrathecal injection? - Answer-12 to 14ml
Small children undergoing CT exams are commonly sedated with the medication
________. - Answer-Chloral hydrate
Disassociating into charged particles when placed into a solution is the term given to
______ contrast material. - Answer-Ionic
The use of non-ionic vs. ionic contrast media should be based on? - Answer-1. age and
physical condition of patient
2. allergic history of the patient
Due to the density, barium sulfate suspensions used for CT exams must be a
concentration of? - Answer-1% to 3% barium sulfate
The number of ions formed when a substance dissociates in a solution is referred to as
___________. - Answer-Osmolality
The advantages of a helical Ct when compared to conventional CT scanning is/are? -
Answer-1. reduces misregistation artifacts
2. reduces scan time
The best eval of coronary artery disease which of the following types of ct scanners
should be used? - Answer-Electron Beam Scanner
The advantages of using an automatic power injector versus the manuel bolus method
of IV contrast administration includes? - Answer--uniform contrast admin through entire
length of study
-increased tissue enhancement due to the fast injection rates
The flow rate for a biphasic tech, for a spiral CT study of the liver would include? -
Answer-3ml/s for 50ml followed by 1.5 ml/s for 100ml
Reference detectors of 3rd generation are used to? - Answer-Measure the incident
radiation intensity and are used by the computer during calculation of the linear
attenuation coefficient.
, The recon. by the computer of a CT image received from the transmission signal
produced by the detectors must be converted into numeric information by what? -
Answer-Analog-to-digital convertor
________ can be used to measure slice thickness, noise and contrast resolution. -
Answer-Phantoms
When performing a high-resolution chest CT which of the following protocols should be
used? - Answer-1.0mm sections, bone algorithm
Slice thickness is governed by the ? - Answer-smallest single detector element
Instructions for a pt just completing an intrathecal injection of IV contrast for a post-
myelographic CT study of the lumbar spine includes? - Answer-Rest for 8 to 24 hours
with head elevated
Once the x-ray beam passes through an object the intensity of the beam to a detector is
called ? - Answer-Transmitted intensity
Mild adverse reactions to iodinated IV contrast media are common. Examples include....
- Answer-Nausea, mild urticaria and warm flush sensation
What is the primary reason iodine is the most common material used in radiopaque
contrast media? - Answer-High atomic number
Of the following x-ray interactions between the x-ray beam and the pt which results in
the most patient dose? - Answer-Photoelectric Effect
An infection that occurs from indirect contact with a contaminated object is termed? -
Answer-Fomite
Systemic hypotension causes a condition of cerebral ischmia,the term used to describe
this is? - Answer-Vasovagal Reaction
Retrospective Recons uses scan data (raw data) to reconstruct a secondary image with
an adjustment in a ________ ______. - Answer-Technical factors
Contrast materials that do not dissociate when placed in an aqueous solution due to
their low osmolatic nature are called? - Answer-Non-Ionic
Interpolation is a mathematical tool used to estimate what? - Answer-Function's
behaviors
Place the following radiographic exam in the order in which they should be performed
on a single patient. - Answer-CT abdomen, barium enema, gastrointestinal series
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