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CT Registry Review Test Questions with Correct Answers
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CT Registry Review Test
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CT Registry Review TestTrue or False: Conventional step-step scanning you can't retrospectively recon Slice
thickness. - answer True
True or False: Helical and Multi-Slice can retrospectively recon slice thickness because
it is a volume - answer True
What is the appropriate IV Contrast dosage in cc/kg? - answer1-2 cc/kg
What is the 1st drug administered for anaphylactic shock? - answer Epinephrine
What is the first drug administered for a vasovagal reaction? - answer Atropine
Why administer Atropine to a patient with a Vasovagal reaction? - answer Heart and
Blood pressure drop due to reaction and Atropine speeds up the Heart rate to
compensate.
What anatomical region is images if a glioma is suspected? (Such as Astrocytoma,
Schwan Cellanoma, Oligodendroglioma) - answerBrain, Most common Adult Posterior
Fossa
What are the types of detectors commonly used in CT Systems? - answerScintillation
(Solid State) and Gas (Xenon)
What is the advantage of Scintillation detectors over Xenon gas? - answerMore Efficient
What determines pixel size? - answerDFOV (SFOV) divided by matrix size
What is quantum noise related to? - answerNumber of detected photons (Anything you
do to increase that leads to better detector signal, reduces noise, kills soft tissue, but
does not hurt bone windows)
How do you calculate Spiral (Total volume scanned)? - answer(Pitch) x (Section
thickness) x (Total scan time)
How can a ring artifact be corrected? - answerRecalibrate, Recalibrate the detector,
Recalibrate the detectors (Gain)
Voxel - answer(Pixel area) x (Section thickness)
, What must you have to change the DFOV after a scan has been completed? -
answerRaw Data or Scan Data
What is the normal Creatinine Range? - answer.6 - 1.2 mg/dl
What type of Contrast Media is utilized for a biopsy of the pancreas? - answerOral
Water Soluble Iodinated (No Barium for biopsy)
What type of archival system is NOT used to store long term data? - answerHard Drive
(Disk)
What type of artifact is caused by a metal prosthesis? - answerStreak
What does Spatial Resolution depend on? - answerAlgorithm (Reconstruction), Matrix
size, Pixel Size, Slice Thickness Displayed & Scanned FOV
The Seminal Vessicles are located where? - answerPosterior to the bladder, Anterior to
the Rectum, Superior to the Prostate Gland
Why or what does a soft tissue algorithm do? - answerIncrease contrast resolution, but
most of all it decreases noise.
What effect does a bone algorithm have on a CT Image? - answerIncreased image
noise
What causes a streak artifact generally found between the Fundus and the body of the
Stomach? - answerAir-Contrast interface or edge gradient
What artifact is commonly found between the petrous ridges and brain tissue and is
caused by X-Ray penetrating bone and traveling over soft tissue? - answerBeam
Hardening or Cupping
What is Partial Volume Averaging? - answerTwo or more tissue types contained in one
pixel can give ROI reading of (Average) Pixel vales (Wrong CT Numbers)
What scanning protocol best visualizes the seminal vesicles? - answer5mm section
thickness, 5mm couch or bed index (5 x 5)
What angle is a needle reduced to for venipuncture for entering a vein? - answer10-15
degrees. A sterile technique should be used for all injection procedures (Alchohol does
not make it sterile. Betadine, Start in center and work your way outward in a 3-5 inch
circle without retracing)
What type of needle do you use for injecting with a power injector? - answer18-20
gauge angiocatheter (Most Commonly used)
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