CT Registry Review Questions and Correct

CT Registry Review Questions and Correct Answers Iothalamate meglumine - Correct Answer aka Conray; Ionic radiopaque contrast media (RCM) An average range for activated PTT - Correct Answer 25-35 seconds Which of the following is the correct angle of insertion for placing a butterfly needle into a vein for intravenous of a contrast agent - Correct Answer 15 degrees A total volume of 125mL of an iodinated contrast agent is administered intravenously via automatic injector in 50 seconds. The flow rate for this injection is: - Correct Answer 2.5 mL/sec Tachycardia, rapid, shallow breathing, cyanosis are symptoms of what? - Correct Answer Symptoms a patient in shock may exhibit The drug SOLU-CORTEF may be classified as - Correct Answer Corticosteroid Iohexol (ionic or non-ionic?) - Correct Answer Non-ionic contrast material Ionization chamber - Correct Answer Device used to measure patient dose T wave - Correct Answer Portion of the cardiac cycle on an electrocardiogram (Ekg) that corresponds to complete cardiac diastole CT arthrography - Correct Answer Iodinated contrast is injected directly into the joint space Iodixanol - Correct Answer aka Visipaque; Iso-osmolar contrast media (IOCM) Contrast-induced nephrotoxicity (CIN) - Correct Answer Serious decline in renal function following IV contrast injection what is Effective dose - Correct Answer Quantity of absorbed radiation dose based on the radiosensitivity of a particular tissue type 1 / 4

Advantages of a saline flush immediately following IV contrast - Correct Answer 1. Reduction in contrast agent dose

• Reduction in incidence of contrast-induced nephrotoxicity (CIN)
• Reduction in streaking artifact due to dense contrast agent in the vasculature .

Factors that may affect a patient's calculated glomerular filtration rate? - Correct Answer Age, sex, race Medicine administered to dilate the coronary vasculature prior to a cardiac CT exam - Correct Answer Sublingual nitroglycerin Normal diastolic blood pressure in an adult - Correct Answer 60-90 mm Hg Methods to reduce radiation dose to pediatric patients - Correct Answer 1. Reduce mA

• Limit phases of acquisition (INSTEAD OF W/WO JUST DO W.)
• Increase pitch

Relationship of radiation exposure and it's potentially harmful effects; stochastic= - Correct Answer randomly determined; having a random probability distribution or pattern that may be analyzed statistically but may not be predicted precisely.Isolation technique that protects against infection through fecal material - Correct Answer Enteric precautions Conray aka - Correct Answer Iothalamate meglumine Omnipaque aka - Correct Answer Iohexol Isovue aka - Correct Answer Iopamidol Optiray aka - Correct Answer Ioversol 2 / 4

CTDIw - Correct Answer The radiation dose index calculation that takes into account the variations in absorption across the field of view due to beam hardening Direct contraindications to the administration of Iodinated contrast material include - Correct Answer prior life threatening reaction Multiple myeloma Diabetes Unit used to express the total patient dose from a helically acquired CT examination - Correct Answer mGy-cm (milligrays per centimeter) Components of a comprehensive CT stroke management protocol. - Correct Answer 1.Pre-contrast sequence of the brain

• CTA of the brain and carotids
• CT perfusion (CTP) of the brain

Pleural effusion - Correct Answer An abnormal density located in lung field; has an attenuation value of +5.0 Houndsfield units Average attenuation value of simple cyst of the kidney - Correct Answer 0 to +20 Houndsfield units After initiation of rapid bolus administration of an iodinated contrast agent, the arterial phase of hepatic contrast enhancement occurs at approximately - Correct Answer 25-30 seconds The abdominal aorta bifurcates at the level of - Correct Answer L4 On an ECG of the complete cardiac cycle, at which portion on the R-R interval is the heart muscle in diastole - Correct Answer 55%-75% The accumulation on gas within a degenerating intervertebral disc is called the - Correct Answer vacuum phenomenon During a spiral or helical CT examination, the scanner acquires data - Correct Answer 1. continuously as the patient travels through the gantry 3 / 4

• in the form of a complete volumetric data set

Which of the following CT studies of the head is typically performed without a contrast agent? - Correct Answer CT of the brain to r/o subdural hematoma Phase of renal contrast enhancement that best demonstrates transitional cell carcinoma (TCC) of the bladder - Correct Answer Excretory CT examinations of the abdomen are often performed in the right lateral decubitus position to demonstrate the relationship between the: - Correct Answer Duodenum and the pancreatic head The section width and spacing for a general survey CT of the neck - Correct Answer 3 mm thick every 3mm The still viable ischemic cerebral tissue that surrounds the infarct core in a patient with an acute stroke - Correct Answer Ischemic penumbra divergent beam - Correct Answer beam does not stay on same path heterogenuous energy - Correct Answer All the beams coming from the x ray tube are of various energies Noise - Correct Answer Scatter adds density (noise)...low photon energy = scatter

Gantry contains: - Correct Answer 1. Tube

• Detector
• Collimator
• Physical filters--absorbs lower energy photons
• water bath
• collimator (stops beam from diverging)
• bow tie filter (removes noise)

Low voltage generator - Correct Answer Located outside of the tube

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