Mindray Imagyn 7, Operator'S Manual

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7 - 20 Operator’s Manual
7 3D/4D
CAUTION
• One or more of the following artifacts in the data set indicate a disturbance
during acquisition. In all of the following cases the data set has to be
discarded and the acquisition has to be repeated.
– Sudden discontinuities in the reference image B:
These are due to
motion of the mother, the fetus or fetal arrhythmia during acquisition.
– Sudden discontinuities in the color display: Motion of the mother, the
fetus or fetal arrhythmia affects the color flow in the same way it affects
the gray image.
– Fetal heart rate far too low or far too high: After acquisition the
estimated fetal heart rate is displayed. If the value does not match the
estimations based on other diagnostic methods at all, the acquisition
failed and has to be repeated.
– Asynchronous movement in different parts of the image: e.g., the left
part of the image is contracting and the right part is expanding at the
same time.
– The color does not match the structure in the display format of grey
mode: The color displays above or beneath the actual vessels.
– Color “moves” through the image in a certain direction: This artifact is
caused by a failure in detecting the heart rate due to low acquisition
frame rate.
– Use higher acquisition frame rate for better result.
• It is not allowed to perform the STIC fetal cardio acquisition if there is
severe fetal arrhythmia.
NOTE:
The system also supports color STIC 3D flow image function.
Perform the following procedure:
1.
Obtain a feasible 2D image (fetus heart).
To observe a small structure, zoom in the interested part (Usually Res Zooming is applied for
good image quality).
2. Toggle knob to enter 3D/4D acquisition preparation mode.
3. Tap [STIC] to enter STIC acquisition preparation mode.
4. Set the acquisition, displaying related parameters.
– Select the parameter package.
– Set the acquiring time and angle according to the target size and the motion conditions.
For fetus of 20-30 weeks, the acquisition time range are: 10 - 12.5s, and the angle range
are: 10-20°.
For gestation age of more than 20-30 weeks, the acquisition time should be about 15s, and
the angle should be about 30°.