Ultrasound

Ultrasonography is an important medical imaging technique used in humans and pets alike.  Companion Animal Hospital is happy to provide this imaging option as it plays an important role in the diagnosis and treatment of many medical conditions.  Ultrasound uses high frequency sound waves and their echoes. The technique is similar to the echolocation used by bats, whales and dolphins, as well as SONAR used by submarines. 

An ultrasound exam is a way of looking inside your pet’s body (liver, kidneys, and intestines) without having to perform surgery.  The ultrasound machine transmits high-frequency (1 to 5 megahertz) sound pulses into your pet’s body using a probe.  As these sound waves travel through the body, they hit a boundaries between tissues (for example boundaries between fluid and soft tissue, soft tissue and bone).  When hitting these boundaries, some sound waves are immediately reflected back to the probe, while others travel on further until they reach another boundary and get reflected.  These reflected waves are sensed by the probe and this information is sent to the machine.  The machine calculates the distance from the probe to the tissue or organ (boundaries) using the speed of sound in tissue and the time of the each echo’s return.  The machine’s screen uses this information to form a two dimensional picture your veterinarian has been trained to interpret.   

                

Ultrasound is a valuable diagnostic tool in veterinary practice.  It does a great job of evaluating tissue architecture.  Loss of normal tissue architecture is seen in many diseases, most notably cancer.  Other examples of when ultrasound is used in veterinary medicine include:

• Early diagnosis of pregnancy
• Diagnosis of bladder or kidney stones- even those that can’t be seen on radiographs (x-rays)
• Measuring thickness of organs such as intestines and the bladder
• Echocardiography is ultrasound of the heart and is extremely important in the diagnosis of heart disease.  Recommendations for treatment are heavily based on the ultrasound findings.
• Color Doppler can be used to look at blood flow to different organs in the body.

Ultrasonography is an important part of the diagnosis of many conditions we see in pets.  Please let us know if you have any questions about this imaging modality.  We would be happy to discuss its benefits and whether it may be right for your pet!

article written by:

Derek Williamson, DVM

Companion Animal Hospital Vernon Hills and Crawford Animal Hospital