Podcast
Questions and Answers
What is the primary goal of portal venous phase imaging?
What is the primary goal of portal venous phase imaging?
- To detect hypovascular tumors when the liver is contrast-loaded via the portal vein. (correct)
- To visualize the arterial supply to the liver.
- To minimize contrast exposure while still imaging the liver.
- To assess the hepatic vein drainage without contrast enhancement.
If hepatic vein enhancement is not visible during the portal venous phase, what does this indicate?
If hepatic vein enhancement is not visible during the portal venous phase, what does this indicate?
- The scan was initiated too early, preceding hepatic vein enhancement. (correct)
- There is an obstruction in the hepatic veins.
- The scan timing is optimal for detecting hypervascular lesions.
- The scan was initiated too late, missing the peak portal venous enhancement.
Why is the late portal venous phase also referred to as the hepatic phase?
Why is the late portal venous phase also referred to as the hepatic phase?
- Because it coincides with the peak arterial enhancement of the liver.
- Because there is already enhancement of the hepatic veins. (correct)
- Because the portal vein is no longer visible.
- Because it is the optimal time to visualize the gallbladder.
In portal venous phase imaging, at approximately how many seconds should the scanning optimally begin?
In portal venous phase imaging, at approximately how many seconds should the scanning optimally begin?
If a lesion appears hypovascular on portal venous phase imaging, what does this suggest about its blood supply?
If a lesion appears hypovascular on portal venous phase imaging, what does this suggest about its blood supply?
How does the timing of the portal venous phase relate to the arterial phase of liver imaging?
How does the timing of the portal venous phase relate to the arterial phase of liver imaging?
In the context of hepatic imaging, what is the significance of contrast enhancement?
In the context of hepatic imaging, what is the significance of contrast enhancement?
Why is it important to understand the timing of contrast enhancement in different phases of liver imaging?
Why is it important to understand the timing of contrast enhancement in different phases of liver imaging?
During which phase does the enhancement of the portal vein start?
During which phase does the enhancement of the portal vein start?
What is the most important factor to consider regarding timing for optimal portal venous phase imaging?
What is the most important factor to consider regarding timing for optimal portal venous phase imaging?
Flashcards
Portal Venous Phase Imaging
Portal Venous Phase Imaging
Imaging the liver when it's filled with contrast via the portal vein to find hypovascular tumors.
Optimal Scan Time (Portal Venous)
Optimal Scan Time (Portal Venous)
Approximately 75 seconds after contrast injection, representing a later stage where the portal vein is enhanced.
Hepatic Phase
Hepatic Phase
A later phase where you should see enhancement of the hepatic veins, indicating sufficient contrast uptake by the liver.
Study Notes
- Portal venous phase imaging detects hypovascular tumors by imaging the liver when it's loaded with contrast via the portal vein.
- The optimal scanning time is around 75 seconds, representing a late portal venous phase.
- Portal vein enhancement begins at approximately 35 seconds during the late arterial phase.
- The late portal venous phase is also termed the hepatic phase.
- For the hepatic phase to be valid there must be enhancement of the hepatic veins.
- Lack of hepatic vein enhancement suggests scanning was initiated too early.
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