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Sonography – Ultrasound Imaging Explained

Sonography is a diagnostic imaging technique that uses ultrasound waves to visualize organs and tissues. It is painless, radiation-free, and widely used in medicine.

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Things worth knowing about "Sonography"

Sonography is a diagnostic imaging technique that uses ultrasound waves to visualize organs and tissues. It is painless, radiation-free, and widely used in medicine.

What is Sonography?

Sonography (also known as ultrasound or ultrasonography) is a medical imaging technique that uses high-frequency sound waves to create visual representations of structures inside the human body. It is non-invasive, painless, and does not involve ionizing radiation, making it one of the safest diagnostic tools available in modern medicine. Sonography is used across virtually all medical specialties, from internal medicine to obstetrics.

How Does Sonography Work?

A handheld device called a transducer emits brief pulses of ultrasound at frequencies between 2 and 20 megahertz (MHz) into the body. As the sound waves travel through tissue, they are reflected at boundaries between different tissue types. These returning echoes are captured by the transducer and processed by a computer into a real-time two-dimensional image called a sonogram. Advanced systems also offer three-dimensional (3D) and four-dimensional (4D) imaging, as well as blood flow measurements using Doppler sonography.

Areas of Application

Sonography is used in many clinical settings:

Abdominal sonography: Examination of the liver, gallbladder, pancreas, spleen, kidneys, and bladder
Gynecological and obstetric imaging: Monitoring of the uterus, ovaries, and fetal development during pregnancy
Cardiac sonography (echocardiography): Assessment of heart structure and function
Vascular sonography: Imaging of arteries and veins to detect thrombosis or arteriosclerosis
Thyroid sonography: Evaluation of the size, structure, and nodules of the thyroid gland
Musculoskeletal sonography: Examination of muscles, tendons, ligaments, and joints
Emergency sonography (FAST protocol): Rapid assessment in trauma situations

How the Examination is Performed

Before the scan, a special ultrasound gel is applied to the skin to eliminate the air gap between the transducer and the skin, ensuring optimal sound transmission. The physician or sonographer then moves the transducer slowly over the area of interest. The examination typically lasts between a few minutes and half an hour, depending on the clinical question. In certain situations, specialized probes are used, such as a transesophageal probe (inserted through the esophagus) or a transvaginal probe (inserted vaginally), to obtain higher-quality images.

Advantages and Limitations

Advantages

No ionizing radiation, making it safe for use in pregnancy and in children
Real-time visualization of movement (e.g., heartbeat, respiratory motion)
Cost-effective and widely available
No contraindications related to metal implants (unlike MRI)
Suitable for image-guided interventions such as biopsies

Limitations

Sound waves do not penetrate air or bone well, limiting assessment of the lungs and skeletal structures
Image quality depends heavily on the examiner's experience and the patient's anatomy
In patients with obesity, penetration depth may be reduced, affecting image clarity

Safety

Sonography is considered an extremely safe procedure. To date, no harmful effects on human tissue have been documented at diagnostic energy levels. International organizations such as the WHO and the AIUM (American Institute of Ultrasound in Medicine) recommend following the ALARA principle: ultrasound should be used for only as long as necessary and at the lowest possible output settings.

References

Rumack CM, Levine D: Diagnostic Ultrasound. 5th Edition. Elsevier, 2018.
American Institute of Ultrasound in Medicine (AIUM): Official Statements on the Safe Use of Diagnostic Ultrasound. www.aium.org (accessed 2024)
World Health Organization (WHO): Manual of Diagnostic Ultrasound. 2nd Edition. WHO Press, Geneva.

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