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Questions and Answers
What is the purpose of using microbubble agents in contrast-enhanced ultrasound of the liver?
What is the purpose of using microbubble agents in contrast-enhanced ultrasound of the liver?
What type of imaging modalities is contrast-enhanced ultrasound of the liver similar to?
What type of imaging modalities is contrast-enhanced ultrasound of the liver similar to?
What is the primary benefit of using contrast-enhanced ultrasound of the liver?
What is the primary benefit of using contrast-enhanced ultrasound of the liver?
What is the normal flow pattern throughout systole and diastole?
What is the normal flow pattern throughout systole and diastole?
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What should be measured in all cases of suspected liver disease or portal hypertension?
What should be measured in all cases of suspected liver disease or portal hypertension?
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What is the role of microbubble agents in contrast-enhanced ultrasound of the liver?
What is the role of microbubble agents in contrast-enhanced ultrasound of the liver?
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What is the desired outcome of contrast-enhanced ultrasound of the liver?
What is the desired outcome of contrast-enhanced ultrasound of the liver?
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What is the name of the structure that should be measured in certain medical conditions?
What is the name of the structure that should be measured in certain medical conditions?
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What is the name of the duct that is mentioned in the passage?
What is the name of the duct that is mentioned in the passage?
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What is the name of the organ that is mentioned in the passage?
What is the name of the organ that is mentioned in the passage?
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What is the contraindication for guided percutaneous procedures?
What is the contraindication for guided percutaneous procedures?
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How long should a patient fast before a guided percutaneous procedure?
How long should a patient fast before a guided percutaneous procedure?
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What is the purpose of fasting before a guided percutaneous procedure?
What is the purpose of fasting before a guided percutaneous procedure?
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What is the preferred timing for fasting before a guided percutaneous procedure?
What is the preferred timing for fasting before a guided percutaneous procedure?
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What is an important step in patient preparation for a guided percutaneous procedure?
What is an important step in patient preparation for a guided percutaneous procedure?
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What is the direction of the normal blood flow in the hepatic vein?
What is the direction of the normal blood flow in the hepatic vein?
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What is the characteristic of the hepatic vein walls compared to the hepatic artery?
What is the characteristic of the hepatic vein walls compared to the hepatic artery?
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What is the usual pattern of blood flow in the hepatic vein?
What is the usual pattern of blood flow in the hepatic vein?
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What is the characteristic appearance of the coeliac axis?
What is the characteristic appearance of the coeliac axis?
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What is the origin of the hepatic artery?
What is the origin of the hepatic artery?
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What is the most common reason for a nonvisualized gallbladder in the absence of a previous cholecystectomy?
What is the most common reason for a nonvisualized gallbladder in the absence of a previous cholecystectomy?
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What is a rare occurrence in relation to the gallbladder?
What is a rare occurrence in relation to the gallbladder?
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What is an unusual location for the gallbladder?
What is an unusual location for the gallbladder?
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What might be mistaken for a gas-filled bowel loop?
What might be mistaken for a gas-filled bowel loop?
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What is a possible location of the gallbladder?
What is a possible location of the gallbladder?
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Study Notes
Liver Lesions
- Contrast-enhanced ultrasound of the liver uses microbubble agents to enable contrast enhancement pattern of focal liver lesions, similar to contrast-enhanced CT or MRI.
- This allows for characterization of focal liver lesions.
- There is usually continuous flow, but the velocity may vary with respiration.
Portal Vein
- Normal hepatic portal vein flow is continuous, with velocity varying with respiration.
- The portal vein is imaged in the longitudinal plane through a subcostal or oblique approach.
Hepatic Artery
- The hepatic artery can be traced from the coeliac axis, characterized by the 'seagull' appearance of the origins of the common hepatic artery and splenic artery.
- There is normally forward flow throughout systole and diastole, with a sharp systolic peak.
Spleen
- Spleen size should be measured in all cases of suspected liver disease or portal hypertension.
Patient Preparation
- Patients should fast for at least 6 hours, preferably overnight.
- Absence of a previous cholecystectomy may lead to misdiagnosis of a gallbladder packed with stones as a gas-filled bowel loop.
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