Podcast
Questions and Answers
Which method is considered the preferred technique for RBC labeling in liver imaging due to its high efficiency?
Which method is considered the preferred technique for RBC labeling in liver imaging due to its high efficiency?
- Direct labeling with Tc99m
- In vitro labeling (correct)
- In vivo labeling
- Modified in vivo/in vitro labeling
What is the main imaging modality preferred for detecting small hemangiomas in liver imaging?
What is the main imaging modality preferred for detecting small hemangiomas in liver imaging?
- SPECT imaging (correct)
- Ultrasound
- CT scan
- MRI
What is the significance of the nearly 100% positive predictive value of 99Tc-labeled RBC imaging?
What is the significance of the nearly 100% positive predictive value of 99Tc-labeled RBC imaging?
- It allows for automatic diagnosis without imaging.
- It suggests that all liver tumors are benign.
- It indicates high reliability in detecting hemangiomas. (correct)
- It guarantees the absence of any liver tumors.
Which phase is NOT included in the imaging procedure of 99mTc-RBC for liver imaging?
Which phase is NOT included in the imaging procedure of 99mTc-RBC for liver imaging?
What is a key consideration before undergoing Tc99m-labeled RBC liver imaging?
What is a key consideration before undergoing Tc99m-labeled RBC liver imaging?
What type of tumors are cavernous hemangiomas classified as in the liver?
What type of tumors are cavernous hemangiomas classified as in the liver?
What is the typical administered dose of labeled RBCs for 99mTc-RBC liver imaging?
What is the typical administered dose of labeled RBCs for 99mTc-RBC liver imaging?
What imaging phase does NOT typically show increased uptake in the evaluation of liver hemangiomas?
What imaging phase does NOT typically show increased uptake in the evaluation of liver hemangiomas?
How long should patients ideally wait after undergoing abdominal CT with contrast before having Tc99m-labeled RBC liver imaging?
How long should patients ideally wait after undergoing abdominal CT with contrast before having Tc99m-labeled RBC liver imaging?
Which statement accurately reflects the diagnostic accuracy of 99Tc-labeled RBC imaging for detecting hemangiomas?
Which statement accurately reflects the diagnostic accuracy of 99Tc-labeled RBC imaging for detecting hemangiomas?
Which of the following statements regarding the preferred method of RBC labeling is true?
Which of the following statements regarding the preferred method of RBC labeling is true?
Which imaging modality is indicated as preferred for its sensitivity in detecting small hemangiomas?
Which imaging modality is indicated as preferred for its sensitivity in detecting small hemangiomas?
Flashcards
Liver Hemangioma
Liver Hemangioma
A common benign tumor of the liver. It's filled with blood vessels.
Tc99m-labeled RBC Imaging
Tc99m-labeled RBC Imaging
A diagnostic imaging test that uses radioactive red blood cells to visualize blood flow in the liver.
In Vitro RBC Labeling
In Vitro RBC Labeling
A method of labeling red blood cells with a radioactive tracer outside the body.
Diagnostic Accuracy of Tc99m-labeled RBC Imaging
Diagnostic Accuracy of Tc99m-labeled RBC Imaging
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Contrast Material Interference
Contrast Material Interference
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What type of tumor are cavernous hemangiomas?
What type of tumor are cavernous hemangiomas?
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What is Tc99m-labeled RBC imaging used for?
What is Tc99m-labeled RBC imaging used for?
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What does 'in vitro' RBC labeling mean?
What does 'in vitro' RBC labeling mean?
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Describe Tc99m-labeled RBC imaging procedure.
Describe Tc99m-labeled RBC imaging procedure.
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What is the diagnostic accuracy of Tc99m-labeled RBC imaging for liver hemangiomas?
What is the diagnostic accuracy of Tc99m-labeled RBC imaging for liver hemangiomas?
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Why is there a delay period after contrast material use before Tc99m-labeled RBC imaging?
Why is there a delay period after contrast material use before Tc99m-labeled RBC imaging?
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How are hemangiomas typically discovered?
How are hemangiomas typically discovered?
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Study Notes
Liver Hemangioma: Diagnosis and Imaging
- Cavernous hemangiomas are the most common benign liver tumors.
- Tc99m-labeled red blood cell (RBC) imaging differentiates benign from malignant liver cancers.
- RBC labeling methods include in vivo, in vitro, and modified in vivo/in vitro. In vitro labeling is preferred for its high efficiency.
- 99mTc-RBC liver imaging involves three phases: flow study, immediate blood pool images, and delayed imaging.
- 20-25 mCi (740-925 MBq) of labeled RBCs are administered.
- SPECT imaging is preferred for its sensitivity in detecting small hemangiomas.
- Flow studies show decreased or normal perfusion, while delayed images show increased uptake, indicating hemangioma.
- 99Tc-labeled RBC imaging has a high (nearly 100%) positive predictive value for detecting hemangiomas.
Technical Considerations and Patient Preparation
- No special patient preparation is needed before the procedure.
- Patients should wait several days after abdominal CT or radiographic procedures with contrast material before the 99mTc-labeled RBC liver imaging.
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Description
This quiz covers the diagnosis and imaging techniques for liver hemangiomas, specifically focusing on the use of Tc99m-labeled red blood cell imaging. It emphasizes the methodologies, phases of imaging, and the significance of SPECT imaging in detecting benign liver tumors. Learn about patient preparation and the effectiveness of various labeling methods.
