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Factors Affecting Radiographic Density
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16
Physics
Professional
04/02/2013

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Term
mAs
kVp
Field Size
Screen Speed
Definition
have a direct relationship with density
Term
grids
SID
OID/OFD
Definition
have an inverse relationship with density
Term
exposure time is usually kept as __ as possible to minimize motion blur
Definition
short
Term
when exposure time is ___, the mA must be ___ proportionally to provide required intensity
Definition
reduced, increased
Term
___ has more effect than any other factor on the IR exposure because it affects beam ___ and to a lesser degree ____
Definition
kVp
quality
quantity
Term
if OD on a radiograph is to be increased with kVp, an increase of __% in kVp is equivalent to ___ the mAs
Definition
15, doubling
Term
as ___ size is increased, scatter radiation also increases
Definition
field
Term
___ is lower when the field size increases
Definition
contrast
Term
improves image contrast by reducing level of scatter radiation
Definition
grids
Term
___ ratio grids remove more scatter, but also increase patient dose
Definition
higher
Term
used to amplify the incoming xray beam and reduce patient dose
Definition
intensifying screen
Term
alters the intensify the baem according to inverse square law
Definition
SID
Term
more distance means that ___ xrays are reaching the film which means ___ density
Definition
less, less
Term
when SID is increased, mAs is ___
Definition
increased
Term
mAs formula
Definition
mas2= mas1 x (sid2)^2/ (sid1)^2
Term
uses an increased OID to prevent scatter radiation from reaching IR
Definition
airgap techniques
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