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Which of the following is a major source of occupational exposure?
Compton interactions
Which interaction does not involve the removal of an orbital electron?
Classical scattering
Which interactions do not occur within the diagnostic range
Photodisintegration & Pair production
Which interaction requires 1.02MeV of energy
pair production
Photodisintegration: 10 mEV
Which exposure would create the greates number of photoelectric interactions
72 kVP 20 mAs
decreased kvp, increased photoelectric interactions
Positive contrast media is administered to increase the number of which type of interactions?
Photoelectric interactions
Which intearction contributes most to image fog
Compton intearctionsT
Total absorption of incident photon
Photoeletric
When a kvp selected is equal or slightly greater than the inner shell binding energy of a target tissue item, which interactioin occurs most often?
Photoelectric interactions
Whch of the following results in a poor quality image because of improper processing due to extreme overexposure of the IR?
Saturation
Which feature provides a numeric value indicating the level of radiation exposure to the IR
EI
Anatomic tissues which attenuate the xray beam equally have
low subject contrast
An imaging system that can resolve 10 l/mm instead of 6 lp/mm (resolve—>resolution)
Increase spatial resolution
The range of exposure intensities that an IR can accurately detect
Dynamic range
For a given FOV a ___ matrix size will result in _____ pixels
Large, more
Which of the following determines the range of grayscale available for display?
Pixel bit depth
During image display, image contrast can be changed by adjusting
Window width
The ability of an imaging system to distinguish between small objects that attenuate the x-ray beam similarly is
Contrast resolution
the visibility of anatomic structures is increased with
Increased CNR & Increased SNR
An imaging system with a higher DQE
Is more efficient in converting x-ray exposure into a quality image
what type of relationship does mAs have with receptor exposure
Directly proportional
as kvp is increased, the potential difference created inside the x-ray tube is
increased
which of the following is a nucleon
proton and neutron
what is the maxinum number of electrons allowed in the k shel
2
what is the maximum number of electrons allowed in the outermost shell
8
atoms that bind together because of their opposite charges form
ionic
the number of electrons in an atom’s outermost shell is its
valence
The different forms of electromagnetic radiation do not vary
in velocity
the relationship between wavelength and frequency is
inversely proportional
electromagnetic radiation can exists as packets or bundles of energy termed
photons
what is photon energy measured in
Electron volts
Removal of an orbital electron from an atom is
ionization
which of the following are nonionizing forms of em radiation
infrared and radio waves
which of the following does not originate from raadioactive atoms
x-rays
Gamma rays originate from a radioactive atom,
X-ray originates from a tube. ONLY DIFFERENCE ALL SIMILARITIES SIMILAR
The length of time necessary for an atom to decay to half its original amount is its
half life
Beta particle is comprised of an
electron
Alpha particle is comprised of
2 protons and 2 neutrons
X-ray tube is an example of current flow in a
vaccuum
Which of the following decreases voltage by a fixed amount
transformer
function of the rheostate
vary resistance
which of the following allows electrons to flow only from cathode to anode
rectifiers(one way valves)
The unit of measure for electrical current
ampere
step up transformer
increase voltage decrease current ( HIGH POTENTIAL DIFFERENCE)
Which device uses mutual induction
step down and step transformer