Biomedical Engineering Reference
In-Depth Information
Figure 1.13: The focal length and the focal zone of an ultrasound transducer
are indicated. The transducer lateral resolution
d
θ
is a function of its diameter
D
and the emission frequency
f
.
width depends on the transducer effective emission area (Fig. 1.13). Figure 1.14
shows the standard dimensions of a typical IVUS ultrasound transducer. The
tangential or lateral resolution of an ultrasound emitter of diameter
D
houring
emission frequency
f
is given by:
d
θ
=
1
.
22
D
,
d
θ
=
1
.
22
c
D
1
f
and the focal distance (focal length)
F
is given by:
1
4
D
2
λ
F
=
Figure 1.14:
Typical IVUS transducer dimension used by Boston Sci.
