Samsung SONOACE R5 Manual do Utilizador descarregar pdf (Página 39)

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Chapter 1 Safety

Receiver Controls

Receiver controls are used by the operator to improve image quality. These controls have no eect on

output. Receiver controls only aect how the ultrasound echo is received. These controls include gain,

TGC, dynamic range, and image processing. The important thing to remember, relative to output, is

that receiver controls should be optimized before increasing output. For example; before increasing

output, optimize gain to improve image quality.

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) and bone (TIb). 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 the 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. A

default setting is a 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 invoked automatically by

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

or a change in 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

bone.

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Samsung SONOACE R5 Manual do Utilizador Página 39