Samsung SONOACE R5 Manual do Utilizador Página 43

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Chapter 1 Safety
Simultaneous and Update Methods
Use of combination modes aects both the TI and MI through the combination of pulse types.
During simultaneous mode, the TI is additive. During auto-update and duplex, the TI will display
the dominant pulse type. The displayed MI will be from the mode with the largest peak pressure.
Sample Volume Depth
When Doppler sample volume depth is increased the Doppler PRF may automatically decrease. A
decrease in PRF will decrease the TI. The system may also automatically decrease the pulse voltage
to remain below the system maximum. A decrease in pulse voltage will decrease MI.
Doppler, M-mode, and Color Imaging Controls
When a new imaging mode is selected, both the TI and the MI will change to default settings. Each
mode has a corresponding pulse repetition frequency and maximum intensity point. In combined or
simultaneous modes, the TI is the sum of the contribution from the modes enabled and MI is the MI for
the focal zone and mode with the largest derated intensity. If a mode is turned o and then reselected,
the system will return to the previously selected settings.
Probe
Each probe model available has unique specications for contact area, beam shape, and center
frequency. Defaults are initialized when you select a probe. Samsung Medison factory defaults vary
with probe, application, and selected mode. Defaults have been chosen below the FDA limits for
intended use.
Depth
An increase in 2D-mode depth will automatically decrease the 2D-mode frame rate. This would
decrease the TI. The system may also automatically choose a deeper 2D-mode focal depth. A
change of focal depth may change the MI. The MI displayed is that of the zone with the largest peak
intensity.
Application
Acoustic output defaults are set when you select an application. Samsung Medison factory defaults
vary with probe, application, and mode. Defaults have been chosen below the FDA limits for
intended use.
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