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- 頸動脈超音波在照什麼？ What does a carotid ultrasound check for?
- 檢查前的準備：一份簡單的清單 Preparation before the exam: a simple checklist
- 檢查流程與體驗 Examination process and experience
- 檢查後的後續步驟 Follow-up steps after the exam
頸動脈超音波在做什麼？
一篇看懂中風預防的關鍵檢查 What is a Carotid Ultrasound for?
A Guide to Understanding a Key Stroke Prevention Exam
頸動脈超音波是一項安全、無痛、無輻射的影像檢查，核心目的是評估供應腦部血液的關鍵血管——頸動脈與脊椎動脈的健康狀態。它在預防及評估腦中風風險方面，扮演著至關重要的角色。 A carotid ultrasound is a safe, painless, and radiation-free imaging test. Its core purpose is to assess the health of the critical vessels that supply blood to the brain—the carotid and vertebral arteries. It plays a vital role in preventing and evaluating the risk of stroke.
頸動脈超音波在照什麼？ What Does a Carotid Ultrasound Look For?
這項檢查提供的，是一份涵蓋從最早期微小變化到顯著病變的完整血管健康報告。 This exam provides a comprehensive report on your vessel health, covering everything from the earliest microscopic changes to significant pathologies.
兩大核心技術： Two Core Technologies:
- B模式超音波：這是基礎的黑白影像，能清晰地觀察到頸動脈的結構、管壁的厚度，以及是否存在斑塊。 B-mode Ultrasound: This is the basic black-and-white imaging mode that provides a clear view of the carotid artery’s structure, wall thickness, and the presence of plaques.
- 杜卜勒超音波：這是專門用來評估血流的特殊技術。檢查時您聽到的「咻咻」聲，就是您頸動脈內血液流動的聲音，其音調的變化能幫助醫師判斷血流是否順暢。 Doppler Ultrasound: This is a specialized technique used to evaluate blood flow. The “swishing” sound you hear during the exam is the sound of blood flowing through your carotid arteries, and variations in its pitch help doctors determine if the blood flow is smooth.
四大關鍵評估指標： Four Key Assessment Indicators:
- 內中膜厚度 (IMT)：評估血管壁的健康狀況。IMT增厚是動脈硬化的極早期警訊。 Intima-Media Thickness (IMT): Assesses the health of the vessel wall. Thickened IMT is a very early warning sign of atherosclerosis.
- 斑塊分析：評估血管壁上是否有脂肪、膽固醇沉積形成的斑塊，以及斑塊是質地較軟、易脫落的「不穩定斑塊」，還是質地較硬的「穩定斑塊」。 Plaque analysis: Assesses whether there are plaques—deposits of fat and cholesterol—on the vessel wall. It also determines if the plaque is a soft, easily detached “unstable plaque,” or a harder, “stable plaque.”
- 血管狹窄程度：精確測量因斑塊累積導致血管內徑變窄的百分比，這是評估中風風險的最主要依據之一。 Degree of stenosis: Precisely measures the percentage of vessel narrowing due to plaque buildup, which is one of the main criteria for assessing stroke risk.
- 血流動力學：利用杜卜勒技術，觀察血液流經狹窄處時是否出現異常加速，藉此判斷狹窄的嚴重程度。 Hemodynamics: Using Doppler technology, it observes whether blood flow accelerates abnormally when passing through a narrow section, which helps determine the severity of the stenosis.
檢查前的準備：一份簡單的清單 Preparation Before the Exam: A Simple Checklist
頸動脈超音波的準備程序非常簡單，您的配合是獲得準確診斷結果的關鍵一環。 The preparation for a carotid ultrasound is very simple, and your cooperation is a key part of getting accurate diagnostic results.
- 衣著與飾品：建議穿著舒適、領口較低的衣服（避免高領或套頭衫）。**必須取下所有頸部飾品**，如項鍊或垂墜式耳環，以免干擾影像。 Clothing and accessories: Wear comfortable, loose-fitting clothes with a low neckline (avoid turtlenecks or sweaters). You **must remove all neck jewelry**, such as necklaces or large dangling earrings, to avoid interfering with the image.
- 飲食與藥物：檢查前**無需禁食或禁水**，可以正常飲食。常規藥物也應照常服用，除非您的醫師有特別指示。 Diet and medication: You **do not need to fast or restrict water** before the exam; you can eat and drink normally. Regular medications should also be taken as usual, unless your doctor has given specific instructions.
- 頸部清潔：檢查當天請勿在頸部塗抹化妝品或乳液，以免影響超音波傳導膠的效果。 Neck cleanliness: On the day of the exam, please do not apply any makeup or lotion to your neck, as it may affect the ultrasound gel’s efficacy.
- 行前準備：由於檢查過程可能需要30至60分鐘，建議在檢查前先上廁所。 Before the exam: Since the exam can take 30 to 60 minutes, it’s a good idea to use the restroom beforehand.
檢查流程與體驗 Examination Process and Experience
整個過程是無痛且非侵入性的。 The entire process is painless and non-invasive.
- 您會被引導平躺在檢查床上。 You will be guided to lie flat on the examination table.
- 技術人員會在您的頸部皮膚上塗抹一層溫暖、水性的透明凝膠。 A technician will apply a layer of warm, water-based, transparent gel to the skin of your neck.
- 技術人員會將探頭輕輕地壓在您的頸部皮膚上，並沿著頸動脈的走向緩慢移動，從不同角度獲取影像。 The technician will gently press the probe against your neck and slowly move it along the carotid artery to capture images from different angles.
- 為了檢查不同側的頸動脈，您會被引導將頭部輕輕轉向左側或右側。 To examine the carotid arteries on different sides, you will be guided to gently turn your head to the left or right.
檢查中最重要的配合事項 The Most Important Things to Do During the Exam
在整個掃描過程中，請務必**保持安靜、放鬆、請勿移動**。特別需要避免說話、咳嗽或過度吞嚥口水。這些微小的動作會牽動頸部肌肉，可能瞬間改變血流速度，從而導致測量數據失準，影響診斷的準確性。 Throughout the scanning process, it is crucial to **remain still, relaxed, and not move**. It is especially important to avoid talking, coughing, or swallowing excessively. These small movements can cause your neck muscles to tense up, which might instantly alter blood flow velocity and lead to inaccurate measurements, affecting the diagnostic accuracy.
檢查後的後續步驟 Next Steps After the Exam
檢查結束後，技術人員會協助將您頸上殘留的傳導膠擦拭乾淨。此檢查沒有恢復期，您可以立即恢復所有正常活動。 After the exam, the technician will help you wipe off any remaining gel from your neck. There is no recovery period for this exam, and you can immediately resume all normal activities.
檢查當下所擷取的影像與數據，會由放射科專科醫師進行專業的分析與解讀。之後，一份詳細的書面報告將會傳送給您原本的臨床醫師。請務必按照原醫師的預約時間回診，屆時醫師會親自解釋報告結果，並與您討論後續的健康管理計畫。 The images and data captured during the exam will be professionally analyzed and interpreted by a specialist in radiology. A detailed written report will then be sent to your referring physician. Be sure to follow up with your original doctor at your scheduled appointment time, where they will personally explain the report results and discuss your subsequent health management plan with you.
最後再次提醒，本篇文章旨在提供健康知識。任何檢測結果的解讀與醫療決策，都必須由專業的醫療人員，結合您的完整病史和臨床狀況來進行綜合判斷。 As a final reminder, this article is intended to provide health knowledge. The interpretation of any test results and medical decisions must be made by a professional healthcare provider, who will make a comprehensive judgment based on your complete medical history and clinical condition.
