Podcast
Questions and Answers
What is the primary diagnostic advantage of the portal venous phase in abdominal CT imaging?
What is the primary diagnostic advantage of the portal venous phase in abdominal CT imaging?
- Detection of small, low-density liver metastases (correct)
- Optimal visualization of arterial blood flow
- Improved contrast in pancreatic lesions
- Clear imaging of renal structures
During the portal venous phase, what is the typical slice collimation used for imaging the upper abdomen?
During the portal venous phase, what is the typical slice collimation used for imaging the upper abdomen?
- 2.5-5 mm (correct)
- 7-9 mm
- 10-12 mm
- 1-2 mm
The portal venous phase is typically initiated how long after the start of contrast administration?
The portal venous phase is typically initiated how long after the start of contrast administration?
- 65-70 seconds (correct)
- 30-40 seconds
- 15-20 seconds
- 90-100 seconds
In addition to detecting liver metastases, what other critical diagnostic information can the portal venous phase provide?
In addition to detecting liver metastases, what other critical diagnostic information can the portal venous phase provide?
Why is good enhancement of the liver parenchyma important during the portal venous phase?
Why is good enhancement of the liver parenchyma important during the portal venous phase?
How does the patient's body habitus influence the selection of slice collimation during the portal venous phase?
How does the patient's body habitus influence the selection of slice collimation during the portal venous phase?
Which anatomical region is the primary focus of imaging during the portal venous phase?
Which anatomical region is the primary focus of imaging during the portal venous phase?
What is likely to happen if the portal venous phase is initiated significantly earlier than the recommended 65-70 seconds?
What is likely to happen if the portal venous phase is initiated significantly earlier than the recommended 65-70 seconds?
A radiologist suspects a patient has a small, hypodense liver lesion. Which phase of contrast-enhanced CT would be most appropriate for detection?
A radiologist suspects a patient has a small, hypodense liver lesion. Which phase of contrast-enhanced CT would be most appropriate for detection?
What adjustment to imaging parameters might be necessary for an obese patient undergoing a portal venous phase CT scan, compared to a patient of average build?
What adjustment to imaging parameters might be necessary for an obese patient undergoing a portal venous phase CT scan, compared to a patient of average build?
Flashcards
Portal Venous Phase
Portal Venous Phase
Occurs about 65-70 seconds post-contrast, showing liver parenchyma well.
Phase Coverage
Phase Coverage
Using 2.5-5mm slices, it covers the upper abdomen post-contrast.
Phase Importance
Phase Importance
Detecting hypodense liver metastases and venous encasement by tumors
Study Notes
- A portal venous phase (hepatic parenchymal phase) is the third phase.
- Typically acquired 65-70 seconds after contrast administration starts.
- Uses 2.5-5 mm slice collimation, depending on the patient’s body habitus, covering the entire upper abdomen.
- Offers good enhancement of the liver parenchyma.
- Critical for detecting small hypodense liver metastases.
- Aids in diagnosing venous encasement by a tumor.
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