General Procedures and Functional Checks
4-64
Versana Balance – Basic Service Manual
5808768-100 English Rev.9
4-4-11-3 Adjust the TVI Controls
•
To reduce quantification noise (variance), the Nyquist limit
should be as low as possible, without creating aliasing. To
reduce the Nyquist limit: Reduce the
Scale
value.
NOTE:
The Scale value also affects the frame rate. There is a trade
off between the frame rate and quantification noise.
TVI provides velocity information only in the beam direction.
The apical view typically provides the best window since the
beams are then approximately aligned to the longitudinal
direction of the myocardium (except near the apex). To
obtain radial or circumferential tissue velocities, a
parasternal view must be used. However, from this window
the beam cannot be aligned to the muscle for all the parts of
the ventricle.
NOTE:
PW will be optimized for Tissue Velocities when activated
from inside TVI.
Содержание Versana Balance
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Страница 58: ...Introduction 1 30 System view Versana Balance Basic Service Manual 5808768 100 English Rev 9 ...
Страница 270: ...Components and Functions Theory 5 6 System view Versana Balance Basic Service Manual 5808768 100 English Rev 9 ...
Страница 278: ...Service Adjustments 6 8 System view Versana Balance Basic Service Manual 5808768 100 English Rev 9 ...
Страница 330: ...Diagnostics Troubleshooting 7 52 System view Versana Balance Basic Service Manual 5808768 100 English Rev 9 ...
Страница 376: ...Replacement Procedures 8 46 System view Versana Balance Basic Service Manual 5808768 100 English Rev 9 ...
Страница 390: ...Renewal Parts 9 14 System view Versana Balance Basic Service Manual 5808768 100 English Rev 9 ...
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