SonoSite iLook - About the Acoustic Output Table

50 Chapter 5: Safety
Safety
Superficial Imaging Applications:
This system transmits ultrasound energy into various parts of the body using 2D and CPD to obtain
ultrasound images. The breast, thyroid, testicle, lymph nodes, hernias, musculoskeletal structures,
soft tissue structures, and surrounding anatomical structures can be assessed for the presence or
absence of pathology. This system can be used to provide ultrasound guidance for biopsy and
drainage procedures, vascular line placement, and peripheral nerve blocks.
Vascular Imaging Applications:
This system transmits ultrasound energy into the various parts of the body using 2D and CPD to
obtain ultrasound images. The carotid arteries, deep veins in the arms and legs, superficial veins in
the arms and legs, great vessels in the abdomen, and various small vessels feeding organs can be
assessed for the presence or absence of pathology.
About the Acoustic Output Table
The terms used in the acoustic output tables follow:
Transducer Model is the SonoSite transducer model.
Warning: This system is not intended for use in providing guidance for central nerve blocks,
i.e., the brain and spinal cord, or for ophthalmic applications.
Table 1: Acoustic Output Terms and Definitions
Term Defin ition
I
SPTA.3
Derated spatial peak, temporal average intensity in milliWatts/cm
2
.
TI type Applicable thermal index for the transducer, imaging mode, and exam type.
TI value Thermal index value for the transducer, imaging mode, and exam type.
MI Mechanical index.
I
pa.3
@MImax
Derated pulse average intensity at the maximum MI in units of W/cm
2
.
TIS (Soft tissue thermal index) is a thermal index related to soft tissues. TIS scan is
the soft tissue thermal index in an auto-scanning mode. TIS non-scan is the
soft tissue thermal index in the non-autoscanning mode.
TIB (Bone thermal index) is a thermal index for applications in which the
ultrasound beam passes through soft tissue and a focal region is in the
immediate vicinity of bone. TIB non-scan is the bone thermal index in the
non-autoscanning mode.
TIC (Cranial bone thermal index) is the thermal index for applications in which
the ultrasound beam passes through bone near the beam entrance into the
body.