Ultrasound, which commonly falls under diagnostic imaging, is a diagnostic examination in which the transmission of ultrasound beams striking tissue allows the creation of an image. This is why ultrasound is also known as ultrasonography.

Therefore, it is a non-invasive examination in that no radiation is used to perform ultrasound scans. This is the main reason why it is favored as the first-level examination to which patients for whom some pathology is suspected are submitted, but more importantly, it is the reason why ultrasound scans are the primary diagnostic tool in pregnancy and pediatric age.

Ultrasound also has several advantages: it can be performed repeatedly because it is non-invasive and causes no side effects; it is an examination that can be performed quickly with immediate findings, and it is very inexpensive compared with other diagnostic imaging examinations.

Ultrasound of the urinary tract requires the patient to present to the examination site with a full bladder for at least 2 hours .