Ultrasound technology has advanced tremendously during the past 20 years. The original standard was a 2D sonogram but today there are 3D and 4D. The "D" stands for dimension. Read through this guide if you are not familiar with the different sonograms.

Differences Among the Sonograms

A two-dimensional image is flat and similar to a photograph but a sonogram is made from sound waves rather than light. It indicates whether the fetus is developing normally as it scans the bones and internal organs. Moreover, you can see the baby's position within the womb as well as the gender, if the baby is facing forward.

A three-dimensional sonogram shows additional features of your baby and can be helpful to your obstetrician. They have been used to diagnose abnormalities, such as a cleft palate. Some problems can be solved while the fetus is still in the womb if they are detected early enough in the stage of development.

A four-dimensional sonogram is a moving 3D image, rather like watching a movie. The fourth dimension is time. You can watch whatever your baby is doing at the moment. It is the longest of the three types of sonograms and it exposes the fetus to more sound waves than a 2D sonogram. For this reason, only a health care clinic that employs trained medical personnel should administer a 4D sonogram. Avoid commercial sonogram facilities that are not registered health clinics.

When is the Best Time for a 3D or 4D Ultrasound?

While a 2D ultrasound can be done at any time during the pregnancy, there is a limited window of opportunity for 3D and 4D sonograms that will produce quality images. The fetus needs to have some body fat so you can see the outer features rather than bones. They generally have enough body fat for a good image at 26 weeks gestation.

Since you most likely want an image of your baby's adorable face, you'll need to schedule the ultrasound for no later than the 30th week of your pregnancy. The baby's head goes deeper into the pelvic area as it grows, and this is out of range for a good image. The face might not show up on the sonogram after the 30th week.

What Can Affect the Quality of the Image?

The amount of amniotic fluid surrounding the baby has an impact on the image. Basically, a higher concentration of amniotic fluid creates a good contrast and provides a sharper image. Additionally, the technician can only get an image of the facial features if your baby is facing outward. If he or she has turned toward your back, the sonogram will reflect the back or side of the head. Babies move around at will so there is really no way to predict what your little one will be doing when you arrive for the appointment. You might need to reschedule for a few days later. for more information, contact clinics like All Women's Clinic.