Samsung MySono U5 Manual de usuario descargar pdf (Pagina 38)

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Operation Manual

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 through an exam. A poor exam will require a follow-

up, which ultimately increases the 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 skull. One of these

three thermal indices will be displayed at all times. Which one depends upon the system preset or user

choice, depending upon the application at hand.

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 three indices, and only one of these is displayed at any one time. Each

probe application has a default selection that is appropriate for that combination. 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 application-specic nature of the default setting is also an important factor of index behavior.

The default setting is a system control state which is preset by the manufacturer or the operator. The

system has default index settings for probe application. The default settings are automatically loaded

by the ultrasound system when the power is turned on, when new patient data is entered into the

system database, or when the application is changed. The following criteria are used for determining

which of the three temperature indices will be displayed.

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

bone. Some factors might create articially high or low thermal index readings e.g. the presence

of uid or bone, or the ow of blood. A highly attenuating tissue path, for example, will cause the

potential for local zone heating to be less than the thermal index displays.

Scanning modes versus non-scanning modes of operation aect the thermal index. For scanning

modes, heating tends to be near the surface; for non-scanning 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 MySono U5 Manual de usuario Pagina 38