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RAD 0318 Part III

Patient Care

QuestionAnswer
Why is a patient questioned regarding whether they have a history of an overactive thyroid? To determine whether an iodinated contrast agent can be administered intravenously
Blood urea nitrogen (BUN) and serum creatinine provide information about a patient's: kidney function
Why is it important for the technologist to note the patient's breathing, skin coloration, and overall health before the examination begins? It will help the technologist notice signs should adverse effects occur during the scan process
Where is a pedal pulse felt? Posterior ankle or top of the foot
What is the normal range for the respiratory rate of an adult? 14 to 20
The normal range of blood pressure is children is: lower than adults
To distinguish adjacent tissues on a CT image, the tissues must: have different densities
A contrast material that is of a substantially higher density than that of the surrounding structures can be referred to as a ____ agent. positive
The structural property of a contrast agent regarding the number of particles in solution compared with blood is known as: osmolality
The intravenous infusion of HOCM may result in: dehydration
Which factors affect the viscosity of an intravenous iodinated contrast agent? 1) Iodine concentration 2) Lipid solubility 3) Total volume delivered 4) Temperature of the agent 1 and 4
Contrast reactions that are accompanied by a temporary drop in blood pressure, bronchospasms, facial edema, urticaria, and laryngeal edema are generally classified as: moderate reactions
When a patient who previously reacted to HOCM is given as LOCM for a subsequent study, the risk of a repeat reaction is approximately: 5%
What is the single best method of reducing the risk of idiosyncratic contrast medium reaction? Use LOCM
Thhe basic functioning unit of the kidney is the: nephron
After the injection of an iodinated contrast medium, patients with brain metastasis have an increased risk of: seizures
What is the most common type of delayed reaction to intravascular contrast medium? Skin reactions
Barium leaking into the peritoneal cavity is referred to as: barium peritonitis
Given orally, compare LOCM with HOCM. In some instances, particularly with infants, LOCM may provide significant advantages over the HOCM agents
What type of catheter do most manufacturers recommend be flushed with a heparinized saline solution after their use? Closed-end CVAD catheters
The difference between the bolus phase, the nonequilibrium phase, and the equilibrium phase of contrast enhancement is primarily determined by the: injection rate and scan delay
The arteriovenous iodine difference is calculated by: comparing an HU measurement of the aorta to that of the inferior vena cava
Another name for the bolus phase of contrast enhancement is the: arterial phase
When can a drip infusion technique for contrast media administration be used? For a study of the brain when the clinical indication is suspicion of tumor
The volume of contrast administered is increased from 100 mL to 150 mL. The flow rate is unchanged at 3 mL/s. What can be expected? The duration of the contrast injection is increased
Because of the patient's IV access, the flow rate of a contrast injection is reduced from the protocol of 4 mL/s to 2 mL/s. What other adjustments is likely to be made? The scan delay is increased
What injection technique is used for most clinical applications? A uniphasic injection in which the initial 50-mL bolus is delivered at a higher flow rate
What effect does a patient's cardiac output status have on contrast enhancement? As cardiac output is reduced, there is a progressively longer delay in the time required for the contrast bolus to reach peak aortic enhancement
The rational use of CT involves which two key components? Appropriate selection of patients and the minimization of the radiation dose without compromising diagnostic quality
Which unit universally expresses dose? There is no consensus regarding an expression of dose, and many units have been used
The unit of ionizing radiation exposure in air is the: roentgen (R)
The unit of absorbed dose is the: radiation absorbed dose (rad) or gray (Gy)
The Systeme International d'Unites (SI) for ionizing radiation: 1) is used internationally 2) replaces the unit known as the rad 3) replaces the unit known as the rem 1, 2, and 3
The quality factor (Q) is used to: account for the different health effects produced from different types of ionizing radiation
The areas of scatter into adjacent tissue are sometimes called: tails
The dose to the central slice plus the dose from the scatter into nearby slices equals the: MSAD
Which is now the preferred expression of radiation dose in CT dosimetry? R
The relationship between mAs and dose is: linear; the higher the mAs, the higher the dose
When looking at the overall radiation dose from radiologic sources, CT contributes: a disproportionately high percentage of the total
The latency time for cancer induction in the dose ranges used in CT is estimated to be between: 10-30 years
Created by: sspatel