Exam (elaborations)
LRA 222 Week 3 Exam 2024/2025 Questions With Completed & Verified Solutions.
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LRA 222 Week 3 Exam 2024/2025 Questions With Completed & Verified Solutions.
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LRA222
Week
3
What
is
Compton
Interaction?
-
ANS
Incoming
x-ray
photon
loses
energy
and
changes
direction
The
Probability
of
Compton
interaction
occurring
is
related
to?
-
ANS
The
energy
of
the
photon
The
Volume
of
tissue
is
irradiated
determined
by?
-
ANS
part
thickness
or
x-ray
beam
field
size
What
would
produce
the
greatest
amount
of
scatter
radiation
exiting
the
patient?
-
ANS
Higher
kVp
increases
What
is
the
shape
of
the
unrestricted
primary
X-ray
Beam?
-
ANS
Cone
Increased
collimation
results
in
what?
List
steps
-
ANS
Decreasing
field
size
A
significant
amount
of
collimation
will
have
an
effect
on
the
amount
of
radiation
reaching
the
IR?
-
ANS
Decreased
image
contrast
When
imaging
the
pelvis,
changing
from
14x17
collimation
to
8x10
collimation
requires
what?
-
ANS
the
radiographer
must
increase
exposure
to
compensate
for
the
decrease
in
the
number
of
x-ray
photons
that
otherwise
occurs.
What
is
a
Cone
or
Cylinder?
-
ANS
An
aperture
diaphragm
with
an
extended
flange
attached
to
it;
A
flat
piece
of
lead
with
a
hole
in
it
that
has
a
flange
directed
towards
the
patient
What
is
the
most
effective
radiographic
beam-restriction?
-
ANS
Collimators
Which
beam
restriction
device
results
in
images
with
the
most
unsharpness
around
the
edge
of
the
image?
-
ANS
Aperture
diaphragm
b/c
of
its
proximity
to
the
radiation
source
(focal
spot)
What
is
the
field
shape
produced
by
a
collimator?
-
ANS
Rectangular
or
square
What
does
the
automatic
collimator
do?
-
ANS
Limits
the
size
and
shape
of
the
primary
beam
to
the
size
and
shape
of
the
IR
and
Mechanically
adjusts
the
primary
beam
size
and
shape
Where
is
the
grid
located
during
a
radiographic
procedure?
-
ANS
Placed
between
the
patient
and
the
IR
When
are
GRIDS
typically
used?
-
ANS
Only
when
the
anatomic
part
is
10
cm
(4
in)
or
greater
in
thickness
and
for
imaging
procedures
requiring
more
than
60
kVp
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