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Physics of Radiology Exam 2024/2025 Questions With Completed & Verified Solutions.
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Physics of Radiology Exam 2024/2025 Questions With Completed & Verified Solutions.
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Physics of Radiologyhigh voltage (V--> kV), low amperes (A --> mA)
The transformer converts to _______ and ________.
transformer
Converts incoming electricity to a high voltage current that enters the X-ray tube when the circuit
is closed.
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cathode
Current that departs the transformer.
anode
Current that enters X-ray tube from transformer.
X-ray tube
-Converts high voltage current to X-rays
-Directs x-rays toward subject/patient
-Shields unwanted radiation
-Absorbs unwanted heat
negative terminal (filament)
Part of the X-ray tube that functions as the cathode.
, high Z (tungsten) target
Part of the X-ray tube that functions as the anode.
heated tungsten filament
Absorbs thermal energy from the heat generated by an electrical current passing through the
X-ray tube and subsequently gives off electrons that are accelerated across the X-ray tube to hit
the tungsten target.
thermionic emission
Refers to the phenomenon of some electrons in the tungsten filament acquiring enough thermal
energy (from the current passing through the wire) to move a small distance from the surface of
the metal, subsequently escaping to hit the tungsten target.
tungsten target
-Part of the X-ray tube where X-rays are actually produced
-Has high atomic number (high Z) and high melting point, making it efficient at producing X-rays
and withstanding the heat produced
-Angled between 10 and 17 degrees off perpendicular
X-ray tube current
-Measured in milliamperes (mA)
-Refers to the number of electrons flowing per second from the tungsten filament to the tungsten
target.
electrons
The number of ________ determines the X-ray tube current.
heat, X-rays
When electrons hit the tungsten target, they give off:
1
(anode & casting absorb majority)
Less than ___% of X-rays produced from the tungsten target manage to escape the tube and
become usable.
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