
67-16 Medical, Biomedical, and Health
Scanner sensitivity is an important performance feature, especially because spatial resolution can be
en
hanced
wi
th
hi
gher-frequency
tr
ansducers
. Ho
wever,
th
is
is at th
e
ex
pense
of in
creased
ul
trasound
be
am
at
tenuation
an
d
po
orer
pe
netration
. Al
though
ab
solute
me
asurements
of se
nsitivity
of sc
anners
ha
ve
be
en
do
ne
[8
7],
mo
st
ce
nters
re
ly
up
on
cl
inically
me
aningful
“m
aximum
vi
sualization
di
stances”
[8
3,88]
fo
r
es
timating
an
d
co
mparing
se
nsitivity
. Ge
ometric
ac
curacy
al
so
is im
portant,
as im
ages
fr
e-
quently
ar
e
us
ed
to de
termine
st
ructure
di
mensions,
su
ch
as fe
tal
he
ad
siz
e
wh
en
de
termining
ge
s-
tational
ag ...