GE LOGIQ 7 Basic User Manual page 965

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Functional resolution

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Direction 2392536-100 Rev. 1

Functional resolution is an imaging system's ability to detect and

display the size, shape, and depth of an anechoic structure, as

opposed to a pin target. See Figure 18-11 for more information.

The very best possible image is somewhat less important than

reproducibility and stability over time. Routine tests at the same

settings should produce the same results.

The data obtained will give a relative indication of the smallest

structure the system is capable of resolving at a given depth.

To measure functional resolution:

1. Set the front panel TGC slide pots to their center (detent)

2. Gain and acoustic output can be adjusted as necessary,

since these values are displayed on the monitor.

3. Scan a test phantom with a vertical row of anechoic cyst

targets to typical depths for the probe being used.

4. Evaluate the cysts at various depths for a good (round)

shape, well-defined borders and no fill in. Remember, TGC

slide pots are centered and should remain fixed. This may

NOT provide optimal cystic clearing.

5. Document all results for future reference and comparison.

Contact a Service Engineer if a greatly distorted image is

Quality Assurance