Podcast
Questions and Answers
Why is understanding the dual blood supply of the liver crucial when performing a triphasic liver CT scan with IV contrast?
Why is understanding the dual blood supply of the liver crucial when performing a triphasic liver CT scan with IV contrast?
- It helps in identifying calcifications and cystic components within the liver.
- It helps differentiate normal parenchyma from tumors based on enhancement patterns in different phases. (correct)
- It ensures that the contrast agent is administered at the correct rate.
- It minimizes the risk of contrast-induced nephropathy.
During which phase of a triphasic liver CT scan do liver tumors typically enhance, and why?
During which phase of a triphasic liver CT scan do liver tumors typically enhance, and why?
- Portal venous phase, because they receive 100% of their blood supply from the portal vein.
- Non-contrast phase, because tumors are more easily visualized without contrast enhancement.
- Arterial phase, because they receive 100% of their blood supply from the hepatic artery. (correct)
- Delayed phase, because contrast accumulates in the tumor over time.
What percentage of blood supply does normal liver parenchyma receive from the portal vein?
What percentage of blood supply does normal liver parenchyma receive from the portal vein?
- 20%
- 50%
- 100%
- 80% (correct)
If a liver tumor shows enhancement in the arterial phase of a triphasic CT scan, what does this suggest about its blood supply?
If a liver tumor shows enhancement in the arterial phase of a triphasic CT scan, what does this suggest about its blood supply?
In a triphasic liver CT, what is the primary reason for performing a non-contrast phase?
In a triphasic liver CT, what is the primary reason for performing a non-contrast phase?
Which of the following explains why normal liver parenchyma enhances during the portal venous phase of a triphasic CT scan?
Which of the following explains why normal liver parenchyma enhances during the portal venous phase of a triphasic CT scan?
A triphasic liver CT scan reveals a lesion that enhances intensely in the arterial phase and washes out in the portal venous phase. What does this enhancement pattern suggest?
A triphasic liver CT scan reveals a lesion that enhances intensely in the arterial phase and washes out in the portal venous phase. What does this enhancement pattern suggest?
You are reviewing a triphasic liver CT scan and notice a lesion that remains consistently hypodense in all phases (non-contrast, arterial, and portal venous). Which of the following is the most likely nature of this lesion?
You are reviewing a triphasic liver CT scan and notice a lesion that remains consistently hypodense in all phases (non-contrast, arterial, and portal venous). Which of the following is the most likely nature of this lesion?
What is the primary advantage of using a triphasic CT scan over a single-phase CT scan for liver imaging?
What is the primary advantage of using a triphasic CT scan over a single-phase CT scan for liver imaging?
During a triphasic liver CT, what would be the expected enhancement pattern of a hepatic hemangioma?
During a triphasic liver CT, what would be the expected enhancement pattern of a hepatic hemangioma?
Flashcards
Triphasic Liver CT Scan
Triphasic Liver CT Scan
CT scan protocol involving multiple phases of contrast enhancement to visualize liver lesions at different vascular time points.
Tumor Components on NECT
Tumor Components on NECT
Some liver tumors may contain these, visible without contrast.
Dual Blood Supply to Liver
Dual Blood Supply to Liver
The liver receives blood from both the portal vein and the hepatic artery.
Portal Vein Supply to Liver
Portal Vein Supply to Liver
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Hepatic Artery Supply to Tumors
Hepatic Artery Supply to Tumors
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Arterial Phase Enhancement
Arterial Phase Enhancement
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Study Notes
- A minority of tumors have calcifications, cystic components, fat, or hemorrhaging, which can be detected on non-contrast CT (NECT) scans.
- Understanding the dual blood supply to the liver is crucial when administering IV contrast.
- Normal liver parenchyma receives 80% of its blood supply from the portal vein (PV) and 20% from the hepatic artery, so it enhances in the portal venous phase.
- Liver tumors receive 100% of their blood supply from the hepatic artery and enhance in the arterial phase.
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