You’ll also have an option to change the size of the Region of Interest box. I recommend that you place this line just above the baby’s nose. This line is what you’ll use to separate the face from any obstruction, such as the placenta or uterus because the machine will also exclude anything above that line. Therefore, the box MUST be set in a good position to capture a good image.Īlso, note the horizontal line across the top of the box. Everything outside the box will be eliminated from the 4D view. The concept of the Region of Interest box is simple: Everything inside the box will appear in 4D. The box pictured here is the Region of Interest box, most often referred to as "ROI". You’ll be able to adjust the size and position of this overlay. In this mode, you will have a 2D image on the screen along with a convex outline over the image as shown in this image. When you first enter 4D, you'll see a convex box that appears. Step 2: Correctly Setting the Region of Interest/Render Box What I'm helping you do is eliminate as many obstructions as possible. It is okay if you cannot meet all of these criteria. If you're unable to meet these characteristics for a good 2D image, you will need to ask the baby to move its position. Depending on the appendage and angle, it may even block the image of the face entirely. Ultrasound waves can’t penetrate bone very well and will show up as a shadow on the baby's face.
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