Podcast
Questions and Answers
During a triphasic liver CT scan, which phase primarily highlights the arteries after intravenous contrast injection?
During a triphasic liver CT scan, which phase primarily highlights the arteries after intravenous contrast injection?
- Equilibrium Phase
- Delayed Phase
- Portal Venous Phase
- Arterial Phase (correct)
In a triphasic liver CT scan, the portal venous phase is characterized by contrast enhancement primarily in which type of blood vessel?
In a triphasic liver CT scan, the portal venous phase is characterized by contrast enhancement primarily in which type of blood vessel?
- Veins (correct)
- Sinusoids
- Arteries
- Capillaries
What is the typical time frame for the delayed phase in a triphasic liver CT scan after the intravenous contrast injection?
What is the typical time frame for the delayed phase in a triphasic liver CT scan after the intravenous contrast injection?
- 30 to 40 seconds
- 5 to 10 seconds
- 60 to 70 seconds
- 3 to 5 minutes (correct)
A mass appears white during the arterial phase and black during the delayed phase of a triphasic liver CT scan. This pattern is most indicative of which condition?
A mass appears white during the arterial phase and black during the delayed phase of a triphasic liver CT scan. This pattern is most indicative of which condition?
Which of the following best describes the role of a triphasic liver CT scan?
Which of the following best describes the role of a triphasic liver CT scan?
A hepatic hemangioma typically presents with which contrast enhancement pattern on a triphasic liver CT scan?
A hepatic hemangioma typically presents with which contrast enhancement pattern on a triphasic liver CT scan?
If a liver lesion shows rapid contrast uptake in the arterial phase but then 'washes out' and appears dark in the delayed phase, what is the most likely interpretation?
If a liver lesion shows rapid contrast uptake in the arterial phase but then 'washes out' and appears dark in the delayed phase, what is the most likely interpretation?
What is the primary reason for performing multiple phases during a liver CT scan with contrast?
What is the primary reason for performing multiple phases during a liver CT scan with contrast?
Which phase of the triphasic liver CT scan is most crucial for identifying hypervascular tumors?
Which phase of the triphasic liver CT scan is most crucial for identifying hypervascular tumors?
In the context of triphasic liver CT scanning, what does the term 'washout' refer to?
In the context of triphasic liver CT scanning, what does the term 'washout' refer to?
Flashcards
Triphasic Liver CT Scan
Triphasic Liver CT Scan
Liver CT scan that uses intravenous contrast in three phases to enhance visualization and characterization of liver lesions.
Phase 1 (Arterial Phase)
Phase 1 (Arterial Phase)
First phase of triphasic liver CT, occurring 30-40 seconds post-contrast, highlighting arteries.
Phase 2 (Portal Venous Phase)
Phase 2 (Portal Venous Phase)
Second phase of triphasic liver CT, occurring 60-70 seconds post-contrast, highlighting veins.
Phase 3 (Delayed/Equilibrium Phase)
Phase 3 (Delayed/Equilibrium Phase)
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Purpose of Triphasic Scan
Purpose of Triphasic Scan
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Benign Lesion Appearance
Benign Lesion Appearance
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Malignant Lesion Appearance
Malignant Lesion Appearance
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Study Notes
- Triphasic liver CT scans involve scanning the liver using intravenous contrast in three distinct phases.
Phase 1 (Arterial)
- This phase occurs approximately 30 to 40 seconds after the intravenous contrast injection, when the contrast is primarily in the arteries.
Phase 2 (Portal Venous)
- The portal venous phase takes place 60 to 70 seconds after contrast injection, with the contrast now present in the veins.
Phase 3 (Delayed/Equilibrium)
- This final phase is 3 to 5 minutes post-contrast injection.
- Triphasic scans are useful in distinguishing between benign and malignant liver masses based on their contrast enhancement patterns.
- Benign masses typically appear black in phase 1 and white in phase 3, with hemangiomas as an example.
- Malignant masses show a contrasting pattern, appearing white in phase 1 and black in phase 3, such as hepatocellular carcinoma (HCC).
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