Samsung PT60A User Manual download pdf (Page 41)

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Chapter 1 Safety

 Additional Considerations

Ensure that scanning time is kept to a minimum, and ensure that only medically required scanning

is performed. Never compromise quality by rushing an exam. A poor exam will require a follow-

up, which ultimately increases the scanning time. Diagnostic ultrasound is an important tool in

medicine, and, like any tool, should be used eciently and eectively.

 Output Display Features

The system output display comprises two basic indices: a mechanical index and a thermal index. The

thermal index consists of the following indices: soft tissue (TIs), bone (TIb) and cranial bone (TIc).

One of these three thermal indices will be displayed at all times. One of the indices will be displayed

according to the application currently in use, depending on the system settings or user choice.

The mechanical index is continuously displayed over the range of 0.0 to 1.9, in increments of 0.1.

The thermal index consists of the three indices, and only one of these is displayed all the time. Each

probe application has an appropriate default selection. The TIb or TIs is continuously displayed over

the range of 0.0 to maximum output, based on the probe and application, in increments of 0.1.

The default setting that is appropriate for the characteristics of each application is also an important

factor when selecting an index. The default setting is the system control state, which is preset by the

manufacturer or the operator. The system has default index settings for the probe application. The

default settings are applied automatically by the ultrasound system when the power is turned on,

new patient data is entered into the system database, or a change of application takes place.

The decision as to which of the three thermal indices to display should be based on the following criteria:

Appropriate index for the application: TIs is used for imaging soft tissue, and TIb for a focus at or near

a bone. Elements such as uid, bone, and blood ow may act as artifacts that increase or decrease

the TI. A highly attenuating tissue path, for example, may cause the potential for local zone heating

to be lower than the thermal index displays.

The selection of scanned modes or unscanned modes of operation also aects the thermal index.

For scanned modes, heating tends to be near the surface; for unscanned modes, the potential for

heating tends to be deeper in the focal zone.

Always limit ultrasound exposure time. Do not rush the exam. Ensure that the indices are kept to a

minimum, and that exposure time is limited without compromising diagnostic sensitivity.

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Samsung PT60A User Manual Page 41