Samsung PT60A Manual do Utilizador descarregar pdf (Página 44)

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Operation Manual

 Control Eect- Controls Aecting the Indices

As various system controls are adjusted, the TI and MI values may change. This will be most apparent

as the Power control is adjusted; however, other system controls will also aect the on-screen output

values.

 Power

The power controls the system’s acoustic output. Two real-time output values are on the screen: a

TI and an MI. They change as the system responds to power adjustments.

In combined modes, such as simultaneous Color, 2D-mode, and pulsed Doppler, the individual

modes each add to the total TI. Each mode is a vital contributor to this total; the displayed MI will

be from the mode with the largest peak pressure.

 2D Mode Controls

 2D Mode Size

Narrowing the sector angle may increase the frame rate. This will increase the TI. The pulse voltage

may be automatically adjusted down by the software controls to keep the TI below the system

maximum. A decrease in pulse voltage will decrease MI.

 Focus

Changing the focal depth will change the MI. Generally, higher MI values will occur when the focal

depth is near the natural focus of the probe (transducer).

 Color and Power Controls

 Color Sensitivity

Increasing the color sensitivity increases the TI and the time spent to scan color images. Color

pulses are the dominant pulse type in this mode.

 Color Sector Width

Narrower color sector width will increase the color frame rate, and so the TI will increase. The

system may automatically decrease the pulse voltage to stay below the system maximum. A

decrease in pulse voltage will decrease the MI. If pulsed Doppler is also enabled, then pulsed

Doppler will remain the dominant mode and the TI change will be small.

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Samsung PT60A Manual do Utilizador Página 44