Biomedical Engineering Reference
In-Depth Information
4.5
4
c = 2000 m/s
c = 1500 m/s
3.5
3
2.5
2
1.5
1
0.5
1200
1600
1800
2000
2200
1000
1400
Transducer angular speed ( ) [rpm]
Figure 1.18: Functional dependence between the sample frequency and the
transducer angular speed.
the transducer (Fig. 1.14) and the typical arterial lumen diameter. The scatterer
number contained in a sweeping beam volume given by the difference between
the sweeping lumen arterial volume
V
a
and the plastic sheathing transducer
volume
V
t
:
V
b
=
V
a
−
V
t
=
π
a
(
D
2
−
D
2
M
)
/
4
(1.10)
where
D
and
D
M
are the arterial lumen and the sheathing transducer exterior
Figure 1.19: The scatterers volume for each arterial structure can be calculated
by taking into account the total volume
V
b
swept by the ultrasound beam.
