Imaging with sound waves is called ultrasound imaging, and is the second most common form of medical imaging in veterinary medicine. When an ultrasound examination is performed, a harmless, high-frequency sound beam – not detectable by humans or pets – is projected into the body of your pet. Ultrasound examinations are complementary to x-rays: they are especially useful in detecting abdominal diseases , reproductive problems and are often able to provide a diagnosis when x-rays cannot. The functioning of various organs and blood flow can be observed to determine if they are malfunctioning.