Ultrasound (also called ultrasonography or sonography) involves the use of high-frequency sound waves to create images, or sonograms, of organs and systems within the body.
You may be familiar with ultrasounds as a part of routine prenatal care. Pregnant women often receive ultrasounds in order to monitor the fetus as it develops, and because sonography is non-invasive, it is safe for both mother and child.
Ultrasounds are also used to visualize other parts of the body, from muscles and tendons to internal organs. This technology is widely employed as a diagnostic tool by radiologists and sonographers to capture the size and structure of organs. Ultrasounds can also help determine the composition of any masses or tumors detected within the body.
Ultrasound can be used as a diagnostic imaging tool. There are also therapeutic ultrasounds, which are a new, non-invasive technology used to treat blood clots and tumors.
Diagnostic ultrasounds use probes called transducers to generate images of structures within the body. These transducers come in many shapes and sizes and emit high-frequency sound waves that are translated to images via computer.
Most ultrasounds are performed with the transducer placed against your skin. Sometimes an internal ultrasound may be required to help diagnose gynecological and other issues. As the sound waves bounce off organs and tissues, they create echoes that can be interpreted as real-time images. Because these specific sound waves are not able to travel through air, it is important for the technologist to apply a special ultrasound gel to your skin before using the transducer in order to achieve an image.
The intensity of these "echoes" changes based on the density of the tissue being scanned — for example, a fluid-filled cyst may appear darker by sonogram because it is less dense than a solid mass, which shows up brighter on the screen. Using ultrasound technology, a sonographer can view the inner-workings of your body in great detail, from organ and tissue structure down to the movement of blood through your blood vessels.
Therapeutic ultrasounds are used to modify or destroy tissue, such as blood clots, kidney stones or tumors using a process called thermal ablation. The benefit of therapeutic ultrasound as a non-invasive therapy is still being studied, though patients generally prefer the lack of incisions and recovery time when compared to traditional surgery. Unlike diagnostic ultrasounds, therapeutic ultrasounds are only performed as interventional radiology procedures in one of our hospitals.
Within the realm of diagnostic ultrasounds, there are a few common types of exams patients may receive:
Perhaps the biggest benefit of ultrasound over other imaging modalities is the lack of ionizing radiation used during exams. This makes ultrasound a relatively safe alternative for pregnant women, young children and those who cannot otherwise receive diagnostic imaging. Ultrasound equipment is also very portable, allowing ultrasound technologists to scan patients with mobility issues.
Parents with young children (who may feel uneasy about being inside an MRI machine), or anyone who suffers from claustrophobia, will also appreciate the relative ease and comfort of an ultrasound exam. In addition, ultrasound exams tend to be less expensive overall when compared to other types of diagnostic imaging such as MRI, CT and PET.
At Memorial Hermann, we recognize the important role that ultrasound can play in ensuring the accuracy of your diagnosis. That’s why we do our best to keep out-of-pocket costs for ultrasounds as low as possible. As with any test or medical procedure, we recommend you check with your insurance provider to ensure specific exams are covered under your current plan.
Ultrasound has been used as a safe and effective imaging procedure for over 35 years. In that time, no known biological side effects have been observed in patients. Despite this stellar safety record, the FDA still recommends the “prudent use” of ultrasound imaging and discourages patients from undergoing exams unless they are medically necessary.
While it is not necessarily a risk, keep in mind that ultrasounds cannot fully replace other imaging types. For example, ultrasound images may not be as detailed as those from a CT or MRI scan for certain indications, and high-frequency sound waves cannot travel through dense structures like bone, making X-rays a more viable option. Talk with your doctor if you have any questions or concerns about which imaging technique is right for you.
Ultrasound exams are simple outpatient procedures. They are non-invasive, relatively painless and take very little time to complete.
If your doctor has ordered an ultrasound, you may be wondering what to expect. To learn what to expect and how you should prepare for an ultrasound exam as well as how long it typically takes to receive your results, click here/what happens during an exam Your doctor can also provide more specific information about an ultrasound.
Compared to exams like MRI, which may require an IV or the ingestion a barium contrast solution prior to scanning, ultrasounds need little to no preparation.
There are a few minor exceptions, including:
When you arrive at a Memorial Hermann Imaging Center, you will first check in at the front desk. A patient access representative will help you complete routine billing paperwork. The ultrasound technologist will then meet you in the waiting room and bring you to a private exam room. The technologist will review your information with you, explain how the exam will work and answer any of your questions.
Depending on the type of ultrasound exam you receive, you may be asked to undress and put on a hospital gown in a private changing room before the procedure begins. Once you are lying on the examination table, our registered ultrasound technologist will use a handheld transducer to perform the ultrasound. A clear gel will be applied to your skin to help the transducer pick up sound waves as it moves back and forth over the area being scanned. For your added comfort, all Memorial Hermann Imaging Centers are equipped with ultrasound gel warmers.
There will be light pressure from the transducer, but you should feel little to no discomfort unless the area is tender. As the technologist performs the procedure, they will move the transducer around to obtain high quality images of the entire area. You may be asked to change positions slightly or even hold your breath in order to get a clearer image.
Once the exam is finished, the technologist will wipe off the ultrasound gel. Any remaining gel will dry quickly and will not stain or discolor your clothing.
At Memorial Hermann, we understand that your time is very important, and we do our best to make sure each exam is quick and thorough. A standard ultrasound procedure should take no more than 30 to 45 minutes, from check-in to exam completion.
Sonogram images from your ultrasound will be sent for immediate analysis to one of our affiliated radiologists. Once they have interpreted the images, a full report will be sent to your physician who ordered the exam. This process usually takes about 2-3 business days. Your doctor may schedule a follow-up appointment with you to go over the results.
When it comes to the health and safety of you or your loved ones, you expect nothing less than the best care available, and at Memorial Hermann, we’re committed to providing you with an unparalleled level of diagnostic services. Memorial Hermann Imaging Centers are also conveniently located at over a dozen locations across the Greater Houston area.