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Ultrasound: Explanation, Uses & Procedure

Ultrasound is a diagnostic imaging technique that uses sound waves to create images of organs and tissues inside the body. It is painless, radiation-free, and widely used in medicine.

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Things worth knowing about "Ultrasound"

Ultrasound is a diagnostic imaging technique that uses sound waves to create images of organs and tissues inside the body. It is painless, radiation-free, and widely used in medicine.

What is Ultrasound?

Ultrasound (also called ultrasonography or sonography) is a medical imaging technique that uses high-frequency sound waves to produce images of structures inside the body. These sound waves are above the range of human hearing – typically between 1 and 20 megahertz (MHz). The procedure is non-invasive, painless, and does not use ionizing radiation, making it one of the safest diagnostic tools available – including during pregnancy.

How Does It Work?

An ultrasound device sends sound waves into the body through a handheld probe called a transducer. These waves are reflected differently at the boundaries between various tissues (the echo principle). The returning echoes are processed in real time and displayed as an image on a screen. A special conductive gel is applied to the skin to ensure good contact and transmission of sound waves.

Areas of Application

Ultrasound is used across many medical specialties:

Internal Medicine: Evaluation of the liver, gallbladder, spleen, kidneys, pancreas, and blood vessels
Cardiology: Echocardiography to assess heart structure and function
Gynecology and Obstetrics: Prenatal care, assessment of the uterus and ovaries
Urology: Examination of the bladder, prostate, and testes
Orthopedics and Sports Medicine: Imaging of muscles, tendons, and joints
Emergency Medicine: Rapid assessment of injuries or acute conditions

Types of Ultrasound Examination

B-Mode Sonography

The most common form of ultrasound. It produces two-dimensional black-and-white images in real time and is used for most standard examinations.

Doppler Sonography

This method measures the speed and direction of blood flow in vessels. It is used to detect circulatory disorders, vascular narrowing, or blood clots.

3D and 4D Ultrasound

Advanced techniques that generate three-dimensional images or even real-time motion sequences (4D). They are particularly used in obstetrics to provide detailed visualization of the unborn child.

Endosonography

In this technique, the transducer is inserted via a probe into body cavities (e.g., the esophagus or rectum) to better visualize deeper structures.

Preparation and Procedure

Preparation depends on the area being examined. For abdominal ultrasound, an empty stomach is often required to minimize air in the gastrointestinal tract. The examination itself typically lasts between 5 and 30 minutes and is not burdensome for the patient.

Safety and Limitations

Ultrasound is considered one of the safest diagnostic procedures in medicine. There are no known risks when used appropriately. However, the technique has limitations: air and bone reflect sound waves strongly, which means the lungs and bony structures are difficult to assess. In such cases, complementary methods such as X-ray, CT, or MRI may be used.

References

World Health Organization (WHO): Diagnostic Imaging. who.int (2022)
American College of Radiology (ACR): ACR Appropriateness Criteria for Ultrasound. acr.org (2023)
Rumack C.M. et al.: Diagnostic Ultrasound. Elsevier, Philadelphia (2018)

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