The terms “sonogram” and “ultrasound” are often used interchangeably. While people will generally understand what’s meant regardless of which word is used, technically they’re not synonyms.
An ultrasound is a simple, radiation-free, non-invasive procedure. Many people are familiar with it from its use during pregnancy to provide doctors with an image of the fetus in a mother’s womb.
A sonogram is an image produced by an ultrasound procedure. The term sonogram loosely translates as “sound writing,” since the sound waves effectively “write” the image that’s produced.