homework questions Flashcards
prime factors of qualitative control
kvp, filtration
mAs means
milliamaperage second
KVP means
Kilovoltage peak
which of the following material is most appropriate for filtration in the X-ray tube
a) mercury
b) Aluminum
b
Abbreviation for Aluminum and lead
AL/ Pb
write the name of the 2 target interactions that are responsible for the creation of the x-ray photons
brems/ characteraistics
the thickness of the absorbing material necessary to reduce the x-ray intensity to half of its original value its termed
half value layer
formula to determine the total filtration of an x-ray beam
total filtration+ inherent/added
radiographic units operating above 70 kvp must have a total filtration value of ?
2.5mm al/ eq
what substance is used fo the inherent filtration of an x-ray beam
a) aluminum
b) glass envelope / oil
b
write the name of the 2 primary interaction of x-ray photon with matter that predominate in the diagnostic imaging field
photoelectric / Compton scattering
between photoelectric and Compton scattering, which is most responsible for occupational exposure?
Compton scattering
write the range of kvp value that are employed for all diagnostic imaging procedures?
a) 30-90
b) 50-120
c) 60-180
b
factors that determine the production of scattered radiation include
field size, kvp, beam restriction
when involuntary motion must be considered, the exposure time may be cut in the half if the kilo voltage is
a) increased by 15 %
b) halved
c) doubled
a
the angle on the anode of an x-ray rube helps to insure that the majority of the x-ray photons produced at the target are
a) absorbed in the surface
b) directed towards the PT
c) scattered in all direction
b
the negative electrode of an X-ray tube is commonly called?
cathode
a reduction in the amount of scattered radiation in a radiographic image is likely from ?
a) increase in KVP
b) increase in collimation
b
what percentage of electron stream energy is converted into x-ray
1%
generally, at least what % of loss of bone mineral density has taken place before it can be seen radiograhically
50%
osteoporosis A OR B
B
CHF
A
Ascites
A
osteoblatic metastases
A
