A programmable smoke delivery device for PET imaging with cigarettes containing ¹¹C-nicotine

Area of Science:

• Neuroscience
• Pharmacology
• Medical Imaging

Background:

• Positron Emission Tomography (PET) imaging with ¹¹C-nicotine is crucial for understanding nicotine's role in tobacco dependence.
• Direct assessment of nicotine kinetics and neuropharmacology is vital for addiction research.
• Existing methods for smoke delivery in PET studies exhibit puff-to-puff variability, potentially confounding results.

Purpose of the Study:

• To develop a programmable smoke delivery device (SDD) for reproducible cigarette smoke delivery in PET experiments.
• To standardize puff delivery for accurate measurement of nicotine kinetics.
• To minimize confounding factors associated with inconsistent smoke inhalation.

Main Methods:

• A programmable syringe pump was utilized as a smoking machine to generate puffs from ¹¹C-nicotine-loaded cigarettes.
• The SDD delivered smoke for subjects to inhale during PET data acquisition.
• Brain nicotine time-activity curves and total body absorbed doses (TAD) were measured in participants.

Main Results:

• The SDD produced highly reproducible and adjustable puffs of cigarette smoke.
• Brain nicotine kinetics were nearly identical between subjects using the SDD and those inhaling directly from a cigarette.
• The difference in brain nicotine kinetics was negligible despite a slight increase in smoke aging time with the SDD.

Conclusions:

• The developed SDD effectively delivers ¹¹C-nicotine for PET imaging studies.
• The device minimizes puff variations, offering a more reliable method for assessing nicotine pharmacokinetics.
• This refined SDD is a valuable tool for future research on nicotine deposition and kinetics in tobacco smoke.