Samsung SONOACE R5 Manual do Utilizador descarregar pdf (Página 41)

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Chapter 1 Safety

Control 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 aect the on-screen output values.

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Power

Power controls the system acoustic output. Two real-time output values are on the screen: a TI and

a 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. One mode will be the dominant 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 action will increase the TI. Pulse

voltage may be automatically adjusted down with software controls to keep the TI below the

system maximums. A decrease in pulse voltage will decrease MI.

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Zoom

Increasing the zoom magnication may increase frame rate. This action will increase the TI. The

number of focal zones may also increase automatically to improve resolution. This action may

change MI since the peak intensity can occur at a dierent depth.

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Persistence

A lower persistence will decrease the TI. Pulse voltage may be automatically increased. An increase

in pulse voltage will increase MI.

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Focal no.

More focal zones may change both the TI and MI by changing frame rate or focal depth automatically.

Lower frame rates decrease the TI. MI displayed will correspond to the zone with the largest peak

intensity.

■

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 transducer.

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Samsung SONOACE R5 Manual do Utilizador Página 41