Ultrasound Imaging

An ultrasound scan is performed using a machine that consists of a processing unit, a display screen, and a transducer which the sonographer or physician holds and places on the patient's skin over the area to be examined. Before placing the transducer, a special water-based gel is applied to the skin to facilitate the transmission of sound waves and prevent air gaps between the transducer and the skin. The transducer sends short pulses of sound waves into the body, and when these waves encounter boundaries between different tissues (such as between fluid and solid tissue), some are reflected back as echoes. The transducer captures these returning echoes and sends them to the computer, which interprets them and converts them into images displayed on the screen in real-time. The transducer can capture multiple cross-sectional images from different angles. There are specialized types of ultrasound such as Doppler ultrasound to evaluate blood flow in vessels, and 3D/4D ultrasound to create three-dimensional or moving images (especially in pregnancy). Ultrasound does not use ionizing radiation and is considered safe for pregnant women and children.

Ultrasound imaging is a diagnostic tool used to evaluate a wide range of symptoms and identify their underlying causes related to problems in internal organs and tissues. The scan itself does not cause symptoms but is performed to help diagnose the reason for the patient's complaint or to monitor a known condition. Symptoms or complaints that may prompt a physician to order an ultrasound scan include:

• Pain in the abdomen, pelvis, or flank: To identify the cause of pain such as gallstones or kidney stones, appendicitis, or gynecological issues.
• Unexplained swelling or lumps: In different parts of the body, to evaluate for the presence of masses, abscesses, or fluid collections.
• Abnormal vaginal bleeding or pelvic pain in women: To evaluate the uterus, ovaries, and fallopian tubes.
• Urinary tract problems: Such as difficulty urinating or blood in the urine, to evaluate the kidneys, ureters, and bladder.
• Problems with the thyroid gland or lymph nodes in the neck: To evaluate their size, shape, and the presence of any masses.
• Symptoms suggestive of vascular problems: Such as leg swelling or pain, to evaluate for blood clots using vascular Doppler ultrasound.
• Pregnancy monitoring: To evaluate fetal growth and development and the mother's health.
• Pain or swelling in joints, muscles, or tendons: To evaluate injuries or inflammation.

Underlying causes of these symptoms that ultrasound imaging can help diagnose or evaluate include:

• Stones: In the gallbladder, kidneys, or urinary tract.
• Inflammation: In organs such as the appendix, gallbladder, kidneys, or pelvis.
• Abscesses and fluid collections.
• Tumors and cysts: In various organs (kidneys, liver, ovaries, uterus, breast, thyroid, etc.).
• Vascular problems: Such as deep vein thrombosis, arterial stenosis, or aneurysms.
• Pregnancy and monitoring its progress and any potential issues with the fetus or mother.
• Kidney, liver, spleen, and pancreas diseases.
• Female and male reproductive system problems (prostate, testicles).
• Muscle, tendon, and ligament injuries.
• Presence of foreign bodies in soft tissues.

Diagnosis" using ultrasound imaging relies on the interpretation of the real-time images produced by the machine by a radiologist or a physician specializing in the relevant organ (such as an obstetrician-gynecologist for pregnancy, or a cardiologist for the heart). The images show internal structures, their movement, and blood flow (using Doppler), allowing the physician to identify any abnormalities, changes in size or shape, masses, abnormal fluids, or problems with blood flow. Ultrasound significantly contributes to confirming or ruling out suspected diagnoses based on symptoms and clinical examination.

"Treatment" is not the ultrasound imaging procedure itself but rather the treatment plan developed by the treating physician based on the diagnosis reached through the ultrasound results. Ultrasound also plays an important role in monitoring certain conditions and guiding therapeutic procedures. Stages after the scan include:

• Interpretation of results: The physician reviews the images and writes a diagnostic report.
• Discussion of results with the treating physician: The treating physician explains the scan results to the patient and their implications for their condition, and answers their questions.
• Developing a treatment plan: Based on the diagnosis, the physician recommends the appropriate treatment, whether it is medication, lifestyle changes, additional medical procedures, or surgery.
• Monitoring the condition: In some cases, periodic ultrasound scans are performed to monitor the size of a cyst, the progression of a benign tumor, or the response of a chronic condition to treatment.
• Guiding procedures: Ultrasound can be used to guide biopsy needles to collect tissue samples from suspicious areas, to guide injections of certain medications into joints or soft tissues, or to assist in draining accumulated fluids.
• Evaluating treatment effectiveness: Ultrasound may be used to monitor the improvement of a condition after treatment has begun.