What is Pediatric Abdominal Ultrasound Imaging?
Ultrasound imaging, also called ultrasound scanning or sonography is a method of obtaining images from inside the human body through the use of high frequency sound waves. The sound waves’ echoes are recorded and displayed as a real-time visual image. No ionizing radiation is involved in ultrasound imaging. Because ultrasound images are captured in real time, they can show movement of internal tissues and organs and enable physicians to see blood flow. This can help to diagnose a variety of conditions and to assess damage caused by illness.
What are some common uses of the procedure?
In children, an abdominal ultrasound image is a useful way of examining internal organs, including the appendix, liver, gallbladder, spleen, pancreas, intestines, kidneys and bladder. Ultrasound is particularly valuable for evaluating abdominal pain in young children.
Appendicitis is the most common reason for emergency abdominal surgery. It can occur at any age, but is most common in young people ages 11 to 20. Ultrasound imaging is commonly used to help make the diagnosis of appendicitis in children. Ultrasound is fast, accurate and painless, does not require the child to remain still for long periods, and the equipment is less intimidating than the large tunnels of a magnetic resonance imaging (MRI) or computed tomography (CT) scan. In cases when the appendix is not clearly visualized during a clinic-based ultrasound, a hospital-based ultrasound as an outpatient may be needed.
Ultrasound imaging can:
- Help a physician determine the source of abdominal pain, such as stones, abscesses or an inflamed appendix.
- Guide procedures such as needle biopsies, in which needles are used to sample cells from organs for laboratory testing.
- Help identify the cause for enlargement of an abdominal organ.
- Localize abnormal fluid in the abdomen.
How should my child be prepared for the procedure?
What does the equipment look like?
The ultrasound image is immediately visible on a nearby screen that looks much like a computer or television monitor. The radiologist or sonographer watches this screen during an examination; often, the patient is able to see it as well.
How does the procedure work?
The ultrasound transducer functions as both a loudspeaker to create the sounds and a microphone to record them. When the transducer is pressed against the skin, it directs a stream of inaudible, high-frequency sound waves into the body. As the sound waves echo from the body’s fluids and tissues, the sensitive microphone in the transducer records the strength and location of the reflected waves. With Doppler ultrasound the microphone captures and records tiny changes in the sound wave’s pitch and direction. These signature waves are instantly measured and displayed by a computer, which in turn creates a real-time picture on the monitor. Still frames of the moving picture are frozen to capture a series of images.
How is the procedure performed?
When the examination is complete, you and your child may be asked to wait while the ultrasound images are reviewed, either on film or on a TV monitor. Often, the sonographer or radiologist is able to review the ultrasound images in real time as they are acquired, and your child can be released immediately.
What will my child experience during the procedure?
Who interprets the results and how do we get them?
What are the benefits vs. risks?
- Ultrasound provides real-time imaging, making it a good tool for quick evaluation of potentially emergent conditions such as appendicitis.
- Ultrasound equipment is much less intimidating to young children than the large equipment used in other types of imaging, such as magnetic resonance imaging (MRI) or computed tomography (CT) scans.
- Ultrasound scanning does not require a child to lie perfectly still in order to capture a useful image.
- Ultrasound imaging is a painless, low-cost and non-invasive examination.
- Ultrasound is widely available and easy to use.
- Ultrasound does not expose children to ionizing radiation.
For standard diagnostic ultrasound there are no known harmful effects to humans.
What are the limitations of Pediatric Abdominal Ultrasound Imaging?
Ultrasound has difficulty penetrating bone and therefore can only see the outer surface of bony structures and not what lies within. For visualization of bone, other imaging procedures, such as x-ray, computed tomography (CT) or magnetic resonance imaging (MRI), may be selected. Sound waves do not pass through air, and evaluation of the stomach, small intestine and large intestine is limited by gas within these structures.