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Questions and Answers
What is the main purpose of lung scintigraphy?
What is the main purpose of lung scintigraphy?
Which imaging modality is considered the standard for evaluating pulmonary embolism?
Which imaging modality is considered the standard for evaluating pulmonary embolism?
What is the function of the pores of Kohn and the canals of Lambert in the lungs?
What is the function of the pores of Kohn and the canals of Lambert in the lungs?
In which part of the trachea do the mainstem bronchi divide into lobar bronchi?
In which part of the trachea do the mainstem bronchi divide into lobar bronchi?
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Why are lobes and segments crucial for interpreting pulmonary images?
Why are lobes and segments crucial for interpreting pulmonary images?
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What is the role of bronchial arteries in the lungs?
What is the role of bronchial arteries in the lungs?
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What is the main difference in ventilation between the upper and lower lungs in the upright position?
What is the main difference in ventilation between the upper and lower lungs in the upright position?
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Where is perfusion maximal in the lungs when in the upright position?
Where is perfusion maximal in the lungs when in the upright position?
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Which position results in more even ventilation and perfusion throughout the lungs?
Which position results in more even ventilation and perfusion throughout the lungs?
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What happens to the V/Q ratio from the base to the apex of the lung?
What happens to the V/Q ratio from the base to the apex of the lung?
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What percentage of capillaries are blocked by technetium-99m macroaggregated albumin (MAA)?
What percentage of capillaries are blocked by technetium-99m macroaggregated albumin (MAA)?
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What is recommended for injection to ensure good statistical distribution of MAA in adults for perfusion imaging?
What is recommended for injection to ensure good statistical distribution of MAA in adults for perfusion imaging?
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What is the biologic half-life of MAA in the lung?
What is the biologic half-life of MAA in the lung?
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Why is it important to inject technetium-99m MAA during quiet respiration with the patient supine?
Why is it important to inject technetium-99m MAA during quiet respiration with the patient supine?
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What is crucial for diagnosing pulmonary emboli?
What is crucial for diagnosing pulmonary emboli?
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Which imaging technique demonstrates higher sensitivity in distinguishing chronic thromboembolic pulmonary hypertension from other types?
Which imaging technique demonstrates higher sensitivity in distinguishing chronic thromboembolic pulmonary hypertension from other types?
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What do matched V/Q abnormalities suggest in the context of lung diseases?
What do matched V/Q abnormalities suggest in the context of lung diseases?
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Which lung condition may show distinct V/Q scan patterns with lower lung involvement?
Which lung condition may show distinct V/Q scan patterns with lower lung involvement?
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What do ventilation-perfusion (V/Q) scans help differentiate from pulmonary emboli based on bronchodilator response and clinical history?
What do ventilation-perfusion (V/Q) scans help differentiate from pulmonary emboli based on bronchodilator response and clinical history?
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What can cause nonsegmental perfusion defects in lung scanning?
What can cause nonsegmental perfusion defects in lung scanning?
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Which imaging technique is preferred for staging and response evaluation in lung cancer?
Which imaging technique is preferred for staging and response evaluation in lung cancer?
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What do V/Q scans assist in differentiating from other conditions like pulmonary emboli in lung imaging?
What do V/Q scans assist in differentiating from other conditions like pulmonary emboli in lung imaging?
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What can cause diffuse or scattered nonsegmental perfusion defects in lung scanning?
What can cause diffuse or scattered nonsegmental perfusion defects in lung scanning?
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What is a leading cause of death during pregnancy in the developed world?
What is a leading cause of death during pregnancy in the developed world?
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What is the most important use of a V/Q lung scan?
What is the most important use of a V/Q lung scan?
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In a ventilation scan, why can xenon be seen longer at the lung bases?
In a ventilation scan, why can xenon be seen longer at the lung bases?
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What is a characteristic of normal DTPA aerosol ventilation images?
What is a characteristic of normal DTPA aerosol ventilation images?
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Why is accurate diagnosis crucial before starting anticoagulation and thrombolytic therapies?
Why is accurate diagnosis crucial before starting anticoagulation and thrombolytic therapies?
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Which imaging technique categorizes the probability of pulmonary emboli based on specific interpretive criteria like PIOPED?
Which imaging technique categorizes the probability of pulmonary emboli based on specific interpretive criteria like PIOPED?
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Why are V/Q scans particularly recommended for follow-up in diagnosed cases?
Why are V/Q scans particularly recommended for follow-up in diagnosed cases?
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What is a challenge associated with CTPA as a diagnostic tool for pulmonary emboli?
What is a challenge associated with CTPA as a diagnostic tool for pulmonary emboli?
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Why do small pulmonary emboli present a diagnostic challenge?
Why do small pulmonary emboli present a diagnostic challenge?
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Why is poor-quality portable supine film a concern when interpreting lung scans?
Why is poor-quality portable supine film a concern when interpreting lung scans?
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What is a distinguishing feature between aerosol scans and perfusion scans?
What is a distinguishing feature between aerosol scans and perfusion scans?
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What is the mean diameter of the aerosols administered to the patient?
What is the mean diameter of the aerosols administered to the patient?
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In which type of patients is central deposition of larger particles common?
In which type of patients is central deposition of larger particles common?
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Why is Xenon-133 used for evaluating ventilation and perfusion?
Why is Xenon-133 used for evaluating ventilation and perfusion?
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What is required from the patient during a ventilation study using Xenon-133?
What is required from the patient during a ventilation study using Xenon-133?
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Which technique can be used along with SPECT for improved lung scan accuracy?
Which technique can be used along with SPECT for improved lung scan accuracy?
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What is the main limitation mentioned in using 99mTc-DTPA aerosols?
What is the main limitation mentioned in using 99mTc-DTPA aerosols?
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Why is it recommended to adjust the doses of 99mTc-MAA and 99mTc-DTPA aerosol when performing sequential imaging of ventilation and perfusion?
Why is it recommended to adjust the doses of 99mTc-MAA and 99mTc-DTPA aerosol when performing sequential imaging of ventilation and perfusion?
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