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RADT 465-Eqpmnt/QC
ARRT registry review covering equipment operation and quality control
Question | Answer |
---|---|
How much of the total energy created during an exposure results in x-rays and what is the remaining energy that does not produce x-rays converted to? | Less than 1% of the energy produced during an exposure results in x-rays. The majority of the energy, over 99%, is converted to heat. (Lange Q&A, 10th ed, Pg. 275) |
What type of transformer is used to increase voltage to kilovoltage? | A high-voltage or step-up transformer. (Lange Q&A, 10th ed, Pg. 275) |
What is the formula could be used to find the secondary voltage in a step-up transformer? (e.g. Transformer Law/Equation/Formula) | ((V(s) / V(p)) = ((N(s) / N (p)) : Where V(s) is the secondary voltage, V(p) is the primary voltage, N(s) is the secondary number of turns, and N(p) is the primary number of turns. (Lange Q&A, 10th ed, Pg. 275) |
Which generator is considered to be the most efficient and what is it's voltage ripple? (single phase, three phase six pulse, three phase twelve pulse, or high-frequency) | High-frequency generators are considered to be the most efficient and have a voltage ripple of less than 1%. (Lange Q&A, 10th ed, Pg. 276) |
What is thermionic emission? | The "boiling off" of electrons from the filament. (Lange Q&A, 10th ed, Pg. 276) |
What is rectification? | The process of changing alternating current to direct current. (Lange Q&A, 10th ed, Pg. 276) |
In fluoroscopy, this adjusts the mA and kV to account for changes in the thickness and tissue density of various parts of the body. | ABC- Automatic Brightness Control (Lange Q&A, 10th ed, Pg. 277) |
What is the difference between a generator and a motor? | A generator converts mechanical energy into electrical energy and a motor converts electrical energy into mechanical energy. (Lange Q&A, 10th ed, Pg. 278) |
What is the purpose of the line-voltage compensator in the x-ray circuit? | The line-voltage compensator automatically adjusts the incoming voltage to the correct level of voltage to run the x-ray machine. It adjusts for drops and surges in the voltage level entering the machine. (Lange Q&A, 10th ed, Pg. 278) |
What QC device is used to test focal-spot size? | A slit camera, star pattern, or pinhole camera. (Lange Q&A, 10th ed, Pg. 278) |
(T/F) The cathode side of the x-ray tube is positively charged and the anode side is negatively charged. | False: The cathode side of the x-ray tube is negatively charged and the anode side has a positive charge. (Lange Q&A, 10th ed, Pg. 279) |
(T/F) Autotransformers use self-induction. | True (Lange Q&A, 10th ed, Pg. 281) |
(T/F) Quality Assurance deals with equipment and its safe and accurate operation. | False: Quality Control deals with equipment and it's safe and accurate operation. Quality Assurance deals with patient and staff satisfaction. (Lange Q&A, 10th ed, Pg. 281) |
What is inherent filtration and what is an example of it? | Inherent filtration is filtration that is built in to the housing of the x-ray tube. The window of an x-ray tube acts as inherent filtration. (Lange Q&A, 10th ed, Pg. 282) |
(T/F) The kV meter is located on the high voltage side of the x-ray circuit. | False: The kV meter is located on the low voltage side of the x-ray circuit. (Lange Q&A, 10th ed, Pg. 283) |
What is used to test the timer accuracy in single phase equipment? | Spinning-Top Test (Lange Q&A, 10th ed, Pg. 284) |
Within what radiation output range should equipment fall into in order to pass the reproducibiliy test? | Radiation output should be consistent within +/- 5% (Lange Q&A, 10th ed, Pg. 284) |
What is current? | The amount of electric charge flowing per second. (Lange Q&A, 10th ed, Pg. 286) |
What is voltage? | The potential difference between two points. (Lange Q&A, 10th ed, Pg. 286) |
What are the two interactions that produce diagnostic quality x-rays? | Bramstrahlung and Characteristic. (Lange Q&A, 10th ed, Pg. 286) |