Podcast
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?
- To treat liver diseases
- To enable the assessment of the contrast enhancement pattern of focal liver lesions (correct)
- To diagnose liver cancer
- To visualize the liver anatomy
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?
- X-rays
- Mammography
- PET scans
- Contrast-enhanced CT or MRI (correct)
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?
- To characterize focal liver lesions (correct)
- To improve patient comfort
- To reduce examination time
- To reduce radiation exposure
What is the normal flow pattern throughout systole and diastole?
What is the normal flow pattern throughout systole and diastole?
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?
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?
What is the desired outcome of contrast-enhanced ultrasound of the liver?
What is the desired outcome of contrast-enhanced ultrasound of the liver?
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?
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?
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?
What is the contraindication for guided percutaneous procedures?
What is the contraindication for guided percutaneous procedures?
How long should a patient fast before a guided percutaneous procedure?
How long should a patient fast before a guided percutaneous procedure?
What is the purpose of fasting before a guided percutaneous procedure?
What is the purpose of fasting before a guided percutaneous procedure?
What is the preferred timing for fasting before a guided percutaneous procedure?
What is the preferred timing for fasting before a guided percutaneous procedure?
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?
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?
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?
What is the usual pattern of blood flow in the hepatic vein?
What is the usual pattern of blood flow in the hepatic vein?
What is the characteristic appearance of the coeliac axis?
What is the characteristic appearance of the coeliac axis?
What is the origin of the hepatic artery?
What is the origin of the hepatic artery?
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?
What is a rare occurrence in relation to the gallbladder?
What is a rare occurrence in relation to the gallbladder?
What is an unusual location for the gallbladder?
What is an unusual location for the gallbladder?
What might be mistaken for a gas-filled bowel loop?
What might be mistaken for a gas-filled bowel loop?
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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