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Computed Tomography Test Prep, Exams of Nursing

Walden UniversityNursing

A comprehensive study guide or question bank for a computed tomography (ct) exam. It covers a wide range of topics related to ct imaging, including technical factors, contrast media, patient positioning, artifacts, and radiation safety. The questions and answers provide a detailed overview of the knowledge and skills required for a successful ct exam. This document could be valuable for students or professionals preparing for a ct certification exam, as it offers a structured way to review and test their understanding of key ct concepts. The level of detail and the breadth of topics covered suggest that this document is likely intended for use in a university-level course or training program related to radiologic technology or medical imaging.

Typology: Exams

2023/2024

Available from 08/15/2024

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Computed
Tomography Test Prep
Questions Q & A
________ can be used to measure slice thickness, noise
and contrast resolution. - answer ✅✅phantoms
a ct exam calls for the use of a stereotactic unit, this
specialized equipment is required for what exam? -
answer ✅✅ct guided biopsy of the brain
a ct exam of a female pelvis reveals ascites present in an
area posterior to the uterus and ovaries known as what? -
answer ✅✅cul-de-sac
a decrease in _____ will increase the noise of a ct image. -
answer ✅✅aperture size
a patient with an immunosuppressed condition would be
placed in what type if precaution? - answer ✅✅strict
isolation
an abnormal density of the liver is found to be a fatty
infiltrate. the ct # for this area would most likely be in the
range of what? - answer ✅✅-100 hu
an average skin dose of ____ would be considered typical
for a ct study of the head. - answer ✅✅2 to 4 ugy
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Computed

Tomography Test Prep

Questions Q & A

________ can be used to measure slice thickness, noise and contrast resolution. - answer ✅✅phantoms a ct exam calls for the use of a stereotactic unit, this specialized equipment is required for what exam? - answer ✅✅ct guided biopsy of the brain a ct exam of a female pelvis reveals ascites present in an area posterior to the uterus and ovaries known as what? - answer ✅✅cul-de-sac a decrease in _____ will increase the noise of a ct image. - answer ✅✅aperture size a patient with an immunosuppressed condition would be placed in what type if precaution? - answer ✅✅strict isolation an abnormal density of the liver is found to be a fatty infiltrate. the ct # for this area would most likely be in the range of what? - answer ✅✅-100 hu an average skin dose of ____ would be considered typical for a ct study of the head. - answer ✅✅2 to 4 ugy

an infection that occurs from indirect contact with a contaminated object is termed? - answer ✅✅fomite contrast materials that do not dissociate when placed in an aqueous solution due to their low osmolatic nature are called? - answer ✅✅non-ionic disassociating into charged particles when placed into a solution is the term given to ______ contrast material. - answer ✅✅ionic due to the density, barium sulfate suspensions used for ct exams must be a concentration of? - answer ✅✅1% to 3% barium sulfate during a post-myelogram ct exam the lumbar spine the prone position is used in an effect to reduce what? - answer ✅✅intrathecal contrast material pooling gas accumulating within a degenerating intreverbal disk is termed? - answer ✅✅vacuum phenomenon 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 interpolation is a mathematical tool used to estimate what? - answer ✅✅function's behaviors mild adverse reactions to iodinated iv contrast media are common. examples include.... - answer ✅✅nausea, mild urticaria and warm flush sensation

systemic hypotension causes a condition of cerebral ischmia,the term used to describe this is? - answer ✅✅vasovagal reaction the advantages of a helical ct when compared to conventional ct scanning is/are? - answer ✅✅1. reduces misregistation artifacts

  1. reduces scan time 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 average density of a solitary pulmonary nodule incidents it is benign when it falls within the following ranges? - answer ✅✅175-200 hu the best eval of coronary artery disease which of the following types of ct scanners should be used? - answer ✅✅electron beam scanner the drug known as solu-cortef may be classified as a? - answer ✅✅corticosteriod 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 the major disadvantage to the early back projection method of image reconstruction is the appearance of what? - answer ✅✅star artifact

the maximum iv contrast dose should not exceed ____ for a child. - answer ✅✅3mg/kg of body weight the normal pulse rate for a child should be within what range? - answer ✅✅79 to 120 beats per minute the number of ions formed when a substance dissociates in a solution is referred to as ___________. - answer ✅✅osmolality the position of the seminal vesicles in the male pelvis should be located? - answer ✅✅posterior to the bladder and anterior to the rectum the reason the scan field of view is larger than the anatomy to be scanned is? - answer ✅✅to avoid out of field artifact 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 the term ____ refers to the late effects of radiation. such as genetic mutations, occurring from even small doses of radiation. - answer ✅✅stochastic the use of non-ionic vs. ionic contrast media should be based on? - answer ✅✅1. age and physical condition of patient

  1. allergic history of the patient

what artifact results when slice thickness if more than 20mm and cray beamnis divided over mulit-row detectors? - answer ✅✅cone beam artifact what drug is most commonly used as a local anesthetic in the preparation of the needle insertion site during a percutaneous biopsy? - answer ✅✅lidocaine what is the primary reason iodine is the most common material used in radiopaque contrast media? - answer ✅✅high atomic number what site should not be used for the injection of iv contrast? - answer ✅✅brachial artery what type of detector material generate a flash of light which is converted to an electrical signal by the means of a photodiode? - answer ✅✅solid state detector what type of detector material ionized in response to an xray conversion? - answer ✅✅xenon 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 when performing a high-resolution chest ct which of the following protocols should be used? - answer ✅✅1.0mm sections, bone algorithm when the attenuation of a volume of tissue decreases, the transmitted intensity of a ct xray beam will? - answer ✅✅increase

when the ct tech chooses the sfov, what is being controlled? - answer ✅✅1. correction factors for specific anatomy

  1. number of activated detectors
  2. diameter of acquisition/recon for area of anatomy when the ct technologist chooses a window width to display the ct image the width determines what in the image? - answer ✅✅range of ct #s (pixels) to be displayed where is cerebrospinal fluid produced? - answer ✅✅choroid plexus which of the following is considered a non-toxic contrast material? - answer ✅✅isovue= iopamidol omnipaque= iohexol ultravist= iopromide which of the following terms describes the ability of a ct scanner to differentiate between objects with similar linear attenuation coefficients? - answer ✅✅contrast resolution and sensitivity which of the following will increase the average photon energy of the x-ray beam? - answer ✅✅increased filtration which part of the cathode helps determine the size of the focal spot and slice thickness? - answer ✅✅filament