Carotid artery color ultrasound: the “see-through eye” for non-invasive vascular examination

Carotid artery color ultrasound is an imaging examination that uses ultrasound technology to evaluate the structure and blood flow of the carotid arteries. It is mainly used to screen for vascular diseases such as atherosclerosis, plaque formation, and stenosis. Its core value lies inNon-invasive, safe, real-time imaging, is an important means of early prevention of cardiovascular and cerebrovascular diseases. The primary and secondary content structure is as follows:Definition and Principle(Basic) →Inspection Purpose and Applicable Population(Core) →Operation procedures and precautions(Practical) →Clinical significance and limitations(extension).

Paragraph 2: Definition and Principle—Vascular “Map” under Ultrasound

The full name of carotid artery color ultrasound"Carotid artery color Doppler ultrasound", which combines B-ultrasound imaging and Doppler blood flow detection technology. The probe emits high-frequency sound waves and generates cross-sectional images of blood vessels (B-ultrasound) through reflected signals. At the same time, the Doppler effect can capture the speed and direction of blood flow (color ultrasound), and finally forms"Structure + blood flow" dual-dimensional report. For example, red represents blood flow toward the probe, blue represents the opposite, and plaques will appear as abnormal echogenic masses on the vessel wall. The technology is recommended by the American College of Cardiology and equipment manufacturers such asGE Healthcare (LOGIQ series), Philips (EPIQ series)etc. are all produced.

Paragraph 3: Purpose of examination and suitable population – who needs this examination?

Carotid artery color ultrasound mainly serves three groups of people:①Those with high risk factors such as high blood pressure and diabetes;②Those who have symptoms of dizziness or transient cerebral ischemia;③Postoperative follow-up of patients. Its core goal is to discoveratherosclerotic plaque(especially vulnerable plaques), assess the degree of stenosis (if >50% requires intervention). According to the "China Stroke Prevention and Treatment Guidelines", people over 40 years old with two risk factors should be screened regularly. There is no radiation during the examination, but those with open wounds or severe calcification in the neck may affect the accuracy of the results.

Paragraph 4: Operational procedures and precautions - an easy 10-minute inspection

The examination process only takes 10-15 minutes: the patient lies on his back, the neck is exposed, and the doctor applies coupling agent and then slides the probe. Need to pay attentionAvoid wearing high-necked clothing on the day of inspection, andNo need to fast before the test. Interpretation of results requires a combination of multiple parameters, such asIntima-media thickness (IMT)(Normal <1.0mm),Peak flow velocity (PSV)(Normal <125cm/s) etc. Some primary hospitals may use domestic equipment such asMindray (DC-80), but the diagnostic standards are consistent with those of tertiary hospitals.

Paragraph 5: Clinical significance and limitations—not a “master key”

Carotid artery color ultrasound can prevent stroke"The first line of defense", but its limitations are:①Unable to evaluate intracranial blood vessels(Need to cooperate with TCD);②Significantly affected by operator experience. Professor at Beijing Anzhen HospitalZhou YujieZeng pointed out: "After the plaque is discovered by color ultrasound, the nature should be further clarified through CTA or DSA." Currently, this technology has been included in physical examination packages in many places, with a single cost of about 200-400 yuan, and is usually reimbursed by medical insurance.

Quote sources:

1. "Guidelines for the Prevention and Treatment of Stroke in China (2021 Edition)" - National Health Commission

2. American Heart Association (AHA) "Applicable Standards for Cardiovascular Imaging Examinations"

3. Zhou Yujie, "Clinical Diagnosis and Treatment of Carotid Atherosclerosis", People's Medical Publishing House

4. Equipment manufacturers: GE Healthcare (product: LOGIQ E10), Philips (EPIQ 7), Mindray (DC-80)