VDO MG 2100 Specifiche Scaricare il pdf (Pagina 115)

Rev 1.1 VisualSonics Vevo 2100 Imaging System Operator Manual 115

Chapter 18: Setting up to acquire physiological data

The left panel displays the physiological display setting sections.

4. Adjust the blood pressure monitoring system so that the output is 0 mmHg.

5. In the Blood Pressure section:

a. In the upper drop-down list select Manual Calibration.

b. Click Calibrate.

The blood pressure trace (red) should move to coincide with the 0 mark

on the blood pressure scale.

6. Adjust the blood pressure monitoring system to output a known level, and

note the numeric value of this level.

7. In the Blood Pressure section:

a. Set the BP Gain value to either 1X or 4X. The default value is 4X, which is

the typical setting for most devices.

b. Type the numeric value of the output level into the box.

c. Click Calibrate.

8. The system:

 Calibrates your pressure scale.

 Retains the calibration settings between imaging sessions. You only need

to repeat the calibration procedure if you connect a different blood

pressure monitor or if you think there might be a problem with the

calibration accuracy.

Respiration Gating section

Respiration gating is a tool you can use to effectively suppress the artifacts

coming from respiration and cardiac movement.

When you are acquiring image data along with physiological data, the physical

movement of the subject's chest cavity may move the region of interest you want

to study. This can cause artificial variations in measurements you add to saved

images.

Respiration gating suppresses this effect.

How respiration gating works

To suppress the effect of respiration on your image data, you use the Respiration

Gating tools to select the period of time between breaths – when the body is least

affected by the breathing motion. This brief period of time is called the respiration

gate. The system records image data only during the respiration gate period.

As shown in the following illustration, you work in the physiological trace

window to create the respiration gate along the yellow respiration data trace line.

The beginning of the respiration gate is called the delay point and the length of the

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 452 453

Nessun commento

VDO MG 2100 Specifiche Pagina 115