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CT
Patient care and safety
Question | Answer |
---|---|
When evaluating a patient's labs, elevated creatinine is indication of what medical condition? | Impaired renal function |
When performing an invasive CT exam such as an RFA of the liver, a partial thromboplastin time ( PTT) is drawn. What does the test measure? | time for normal clot formation in plasma. |
what type of consent is obtained prior to a noninvasive CT procedure? | simple expressed |
which of the following methods must be utilized when placing an IV line in an antecubital vein? | The tech must wash their hands prior to starting the IV line |
when administering IV contrast to a patient with a mastectomy, which vein should be chosen? | the vein on the contralateral side |
what instrument is used to measure radiation exposure? | Ionization chamber |
what method is used to lower the viscosity of contrast media before injecting? | heating the media to body temperature |
for radiation workers in the USA what is their dose limits per year? | 50 mSv |
A female pt. arrives in the ER with severe right flank pain. The pt. is 5.4' weighing 100lbs. What technical factors would change to reduce her radiation dose? | mAs, since it's more proportional to dose. |
Which of the following is not part of the patient identification process? | Obtaining informed consent |
what is the premedication strategy for a patient with a prior allergic reaction to iodinated contrast media before a contrast-enhanced CT? | premedication w/ steroids and antihistamines.( prednisode-50mg 13hrs prior, 7hrs, & 1hr before CM. plus diphenhydramine 50 mg IV 1hr before cm. |
When a technologist examines a patient prior to placing an IV catheter for a contrast-enhanced CT study, which of the following veins would you use? | Medial cubital vein. |
Dose descriptors are used to identify approximate patient doses, which of the following is the dose description utilized for modern multi-slice CT scanners? | CTDI volume |
What type of needle is equipped with plastic projections on either side that aid in holding the needle during venipuncture | a butterfly needle |
What is the normal range of respiration for an adult? | 12-20 BPM |
What term refers to the number of ions formed when a substance dissociates in a solution? | Osmolality |
Which of the following is considered a severe reaction to an iodinated contrast reaction? | Cardiopulmonary arrest |
The dose to the central slice plus the dose from the scatter into nearby slices equals which of the following dose descriptions? | MSAD |
What is the dose descriptor that can be calculated if the length of the irradiated volume ( scan length) and the CTDI and known? | DLP |
of the following terms, which is a parenteral rout of administering medication? | Intramuscular |
What is the measure of the total number of particles in contrast media per kilogram of water? | osmolality |
Which of the following is a characterizing of ionic CM | high osmolality |
What test is used to evaluate renal function | GFR |
The mAs for a particular procedure remains constant and the pitch changes from 2 to 1 ; what change does it have on the dose? | Increased dose |
which of the following is deemed a moderate reaction to CM | Dyspnea: |
Which of the following is a property of nonionic CM | Iodine concentration is maintained w/o increasing the number of particles in solution; therefore, it does no increase the osmolality of the blood serum and does not change the osmolality pressure in the blood stream . |
What is the relationship between the does and the number of detectors ? | As number of detectors rows increases dose decreases |
Which of the following is a characteristic of a low-osmolality CM | less toxic. |
What is the principle behind the benefit of lower kV in some clinical applications? | a superior enhancement of iodine |
What radiation dose saving technique adjusts the tube current based on the patient's overall attenuation by modulation the tube current in the angular ( x-Y) and longitudinal ( z) dimensions to adapt to the pt. shape? | Angular-longitudinal tube current modulation |
What is the quantifying risk from partial-body exposure to that from the equivalent whole-body dose? | effective dose |
Which of the following is a sign on an anaphylactic reaction? | Bronchospasm with significant hypoxia |
which of the following statements are characteristics of power injectors? | 1. the maximum volume of each syringe is 200cc 2. they have internal heating mechanisms to maintain the temp of the CM |
which of the following statement's are part of the patient interactions process? | 1. establish truest 2. have the pt. explain the exam back 3. calm the degree of anxiety of the pt. |
which of the following are contraindications for the administrations fo IV CM | 1. asthma 2. atopic syndrome 3. cardiac dysfunction |