Podcast
Questions and Answers
In portal venous phase imaging, what is the primary consideration when detecting hypovascular metastases from colorectal cancer?
In portal venous phase imaging, what is the primary consideration when detecting hypovascular metastases from colorectal cancer?
- Achieving the highest possible arterial enhancement.
- Maximizing the total amount of contrast material in the portal vein. (correct)
- Ensuring the fastest contrast injection rate.
- Minimizing the total amount of contrast agent used.
What contrast injection rate is considered sufficient when performing portal venous phase imaging to detect hypovascular metastases, such as in cases of colorectal cancer?
What contrast injection rate is considered sufficient when performing portal venous phase imaging to detect hypovascular metastases, such as in cases of colorectal cancer?
- 1 ml/sec
- 3 ml/sec (correct)
- 7 ml/sec
- 5 ml/sec
If a radiologist is primarily interested in identifying hypovascular metastases during a CT scan for colorectal cancer, which imaging phase is most suitable?
If a radiologist is primarily interested in identifying hypovascular metastases during a CT scan for colorectal cancer, which imaging phase is most suitable?
- Arterial phase
- Non-contrast phase
- Portal venous phase (correct)
- Delayed phase
Which factor is least critical when optimizing a CT scan protocol focused solely on detecting liver metastases in the portal venous phase?
Which factor is least critical when optimizing a CT scan protocol focused solely on detecting liver metastases in the portal venous phase?
A patient with colorectal cancer undergoes a CT scan to assess for liver metastases. The imaging protocol prioritizes the portal venous phase. What adjustment to the standard contrast injection protocol would optimize the detection of hypovascular lesions?
A patient with colorectal cancer undergoes a CT scan to assess for liver metastases. The imaging protocol prioritizes the portal venous phase. What adjustment to the standard contrast injection protocol would optimize the detection of hypovascular lesions?
A physician suspects hypovascular liver metastases in a patient with a history of colorectal cancer. If the CT protocol is optimized for portal venous phase imaging, how would you expect the contrast enhancement of the liver parenchyma to appear relative to potential metastases?
A physician suspects hypovascular liver metastases in a patient with a history of colorectal cancer. If the CT protocol is optimized for portal venous phase imaging, how would you expect the contrast enhancement of the liver parenchyma to appear relative to potential metastases?
How does the significance of a fast contrast injection rate differ between arterial phase imaging and portal venous phase imaging when assessing for metastatic disease?
How does the significance of a fast contrast injection rate differ between arterial phase imaging and portal venous phase imaging when assessing for metastatic disease?
A CT technologist is preparing to scan a patient for possible colorectal cancer metastases in the liver, focusing on the portal venous phase. What instruction should the technologist provide to ensure optimal image quality?
A CT technologist is preparing to scan a patient for possible colorectal cancer metastases in the liver, focusing on the portal venous phase. What instruction should the technologist provide to ensure optimal image quality?
A radiology department is updating its CT protocols. For a colorectal cancer follow-up protocol assessing for liver metastases, what is the most appropriate recommendation regarding contrast injection if the primary goal is portal venous phase imaging?
A radiology department is updating its CT protocols. For a colorectal cancer follow-up protocol assessing for liver metastases, what is the most appropriate recommendation regarding contrast injection if the primary goal is portal venous phase imaging?
A patient with known colorectal cancer is undergoing a CT scan to evaluate for liver metastases. The radiologist reviews the images and notes a subtle, poorly enhancing lesion in the liver during the portal venous phase. What action would be most appropriate?
A patient with known colorectal cancer is undergoing a CT scan to evaluate for liver metastases. The radiologist reviews the images and notes a subtle, poorly enhancing lesion in the liver during the portal venous phase. What action would be most appropriate?
Flashcards
Portal Venous Phase
Portal Venous Phase
Imaging phase where the total amount of contrast is more important than the injection speed, often used to detect hypovascular metastases.
Contrast Injection in Portal Venous Phase
Contrast Injection in Portal Venous Phase
A slower contrast injection rate (e.g., 3ml/sec) is sufficient because the total amount of contrast is more critical for optimal imaging.
Hypovascular Metastases
Hypovascular Metastases
Hypovascular metastases are tumors with reduced blood supply compared to normal tissue. The portal venous phase is used to detect them.
Study Notes
- Portal Venous phase imaging is useful when looking for hypovascular metastases, such as in cases of colorectal cancer.
- Fast contrast injection is not needed when performing portal venous imaging for hypovascular metastases.
- A contrast injection rate of 3 ml/sec is sufficient for portal venous phase imaging when the goal is to identify hypovascular metastases.
- In the portal venous phase, the total amount of contrast is more important than the speed of injection.
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