CT Registry Exam Review Test questions with 100% Correct Solutions
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Course
CT Registry
Institution
CT Registry
What type of needle do you use for injecting with a power injector? - Answer 18-20
gauge angiocatheter (Most Commonly used)
What is intravenous contrast utilized for spine CT's? - Answer Differentiate between scar
tissue and herniated nucleus pulposus material.
What is necessary for radiation t...
CT Registry Exam Review Test questions with
100% Correct Solutions
What type of needle do you use for injecting with a power injector? - Answer 18-20
gauge angiocatheter (Most Commonly used)
What is intravenous contrast utilized for spine CT's? - Answer Differentiate between scar
tissue and herniated nucleus pulposus material.
What is necessary for radiation therapy planning? - Answer Flat table or pad, external
markers, date and info on film. Non moveable X-Y Coordinates.
True or False: During a radiation therapy planning you want to have movement of your
X-Y Coordinates? - Answer False. During a radiation therapy planning you do not want to
move the plan and as such you should not move you X-Y coordinates.
How does the couch and tube move during a spiral/helical examination? - Answer
Continuously, at the same time.
What are the disadvantages of spiral scanning? - Answer The #1 problem is the
blooming of the effective slice thickness (IE: Thicker slices than what the operater
seleced (10 mm = 12.5mm) It also increases partial volume averaging, tube heat,
increased image noise due to addition of interpolation algorithm involved in the recon
process
What is an array processor responsible for? - Answer Arithmetic computing for image
reconstruction.
Why is it important to scan from the supraclavian region through the adrenal glands for
ct of the chest? - Answer Lung METS spread to adrenals and Vice-Versa.
,What scanning plane best demonstrated the nasal turbinates? - Answer Coronal
What does a hounsfield unit represent? - Answer Linear attenuation coefficient
(Scanned Tissue), CT Number & Absorption
What is necessary to be able to change an algorithm for image reconstruction? - Answer
Raw or Scan Data
What is Window Width? - Answer Total range of gray shades (Total range of CONTRAST
availability).
What is a Window Level? - Answer Central Value (Middle) of the gray scale (DENSITY of
the image)
What is the best position to evaluate air-fluid level in the sinuses? - Answer Prone, Neck
Hyperextended.
What is the average Window Width (WW) and Window Level (WL) for an Abdomen? -
Answer Any number in the following ranges (300-400 WW, 20-60 WL)
What is interpolation? - Answer Mathematical method for taking SPIRAL data and
viewing it as AXIAL images.
Why is a full scanned FOV utilized for CT Scanning of a Spine? - Answer We utilize a
reduced display FOV for spine scanning. We utilize a full circle for the scan or raw data
primarily to AVOID ARTIFACTS.
, What units are used to measure spatial resolution? - Answer Line pairs per Centimeter
(LP/CM Modular Transfer Function (Graph)
What type of contrast media may be visible as long as one year after a CT Exam? -
Answer Any oil based iodinated CM. (Same CM used for Myelograms, trapped barium in
Divertics)
What may occur if contrast media is injected into a dehydrated patient? - Answer
Elevated Creatinine & eventual Hypovolemic Shock due to loss of volume in the vascular
system.
What is the first physical action for Venipuncture? - Answer Apply a tourniquet.
What is the function of a Data Acquisition System (DAS) - Answer Boosts the signal from
the detector and converts analog (Electrical) to Digital information. The Analog to Digital
Converter actually does this but is part of the DAS.
What anatomical region does Phlebitis most commonly occur? - Answer Calf
What are the physical signs that an infiltration has occured during an injection? - Answer
Redness and Swelling
What is considered to be a reaction to Venipuncture? - Answer Infection
What is considered to be a potential reaction to Venipuncture? - Answer Extravasation
potentially leading to an Infection.
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