99mTc-ENS ventilation scintigraphy: preliminary study in human volunteers

Area of Science:

• Nuclear Medicine
• Radiopharmacology
• Pulmonary Imaging

Background:

• Ventilation scintigraphy is crucial for assessing lung function.
• Current agents like technetium-99m diethylenetriamine pentaacetic acid (99mTc-DTPA) have limitations in visualizing certain lung regions, particularly in smokers.
• Exogenous natural surfactant (ENS) is being explored as a novel agent.

Purpose of the Study:

• To evaluate the efficacy of (99m)Tc-labeled exogenous natural surfactant ((99m)Tc-ENS) as a radiopharmaceutical for ventilation scintigraphy.
• To compare the imaging quality and diagnostic capabilities of (99m)Tc-ENS with (99m)Tc-DTPA.

Main Methods:

• Five healthy volunteers underwent nebulization of (99m)Tc-ENS (900-1110 MBq) for 3 minutes.
• Comparative ventilation scintigraphy was performed using (99m)Tc-DTPA in the same volunteers.
• Image quality and visualization of ventilated lung areas were assessed.

Main Results:

• Images obtained with (99m)Tc-ENS were of comparable quality to those acquired with (99m)Tc-DTPA.
• In smoking volunteers, (99m)Tc-DTPA imaging revealed poorly ventilated areas that appeared well-ventilated on (99m)Tc-ENS images.
• (99m)Tc-ENS demonstrated enhanced visualization of certain lung regions not apparent with (99m)Tc-DTPA.

Conclusions:

• (99m)Tc-ENS is a promising radiopharmaceutical for ventilation scintigraphy.
• It offers superior visualization of lung ventilation compared to (99m)Tc-DTPA, particularly in smokers.
• (99m)Tc-ENS facilitates the observation of lung areas missed by conventional agents.