CLINICAL MEDICINE

MEDICINE

RADIOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
X-rays are generated when a stream of electrons traveling from one side of an x-ray tube is suddenly stopped by its impact on the:
A
filament cup
B
tungsten target of the anode
C
tungsten target of the cathode
D
none of the above
Explanation: 

Detailed explanation-1: -It is defined as X-ray radiation produced when high-speed electrons are suddenly stopped at the target. This process of rapidly decelerating the high-speed electron gives rise to Bremsstrahlung or braking radiation.

Detailed explanation-2: -Electron kinetic energy (measured in keV) is related to the applied voltage. The tube voltage, tube current, and exposure duration (measured in seconds) are adjustable by the user. Once the high kinetic energy electrons finally reach the anode target, this initiates the process of X-ray production.

Detailed explanation-3: -X-rays are produced when a stream of electrons in an X-ray tube strikes the metal target. X-rays are high energy electromagnetic radiations. X-rays have a wavelength ranging from 0.01 to 10 nanometers, and frequencies in the range 3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV.

Detailed explanation-4: -Note that the focal spot is a tungsten button that is imbedded in a copper stem. The purpose of the stem is to “conduct” the heat out of the xray tube. This is different compared to the rotating anode which “radiates away” the heat through the glass.

Detailed explanation-5: -X-rays originate from atomic electrons and from free electrons decelerating in the vicinity of atoms (i.e., Bremsstrahlung). Radiation-producing devices produce X-rays by accelerating electrons through an electrical voltage potential and stopping them in a target.

There is 1 question to complete.