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Jakob Löndahl

Jakob Löndahl

Associate Professor / Senior Lecturer

Jakob Löndahl

Airspace Dimension Assessment with nanoparticles reflects lung density as quantified by MRI


  • H. Laura Aaltonen
  • Simon S. Kindvall
  • Jonas K. Jakobsson
  • Jakob Löndahl
  • Lars E. Olsson
  • Sandra Diaz
  • Sophia Zackrisson
  • Per Wollmer

Summary, in English

Background: Airspace Dimension Assessment with inhaled nanoparticles is a novel method to determine distal airway morphology. This is the first empirical study using Airspace Dimension Assessment with nanoparticles (AiDA) to estimate distal airspace radius. The technology is relatively simple and potentially accessible in clinical outpatient settings. Method: Nineteen never-smoking volunteers performed nanoparticle inhalation tests at multiple breath-hold times, and the difference in nanoparticle concentration of inhaled and exhaled gas was measured. An exponential decay curve was fitted to the concentration of recovered nanoparticles, and airspace dimensions were assessed from the half-life of the decay. Pulmonary tissue density was measured using magnetic resonance imaging (MRI). Results: The distal airspace radius measured by AiDA correlated with lung tissue density as measured by MRI (ρ = -0.584; p = 0.0086). The linear intercept of the logarithm of the exponential decay curve correlated with forced expiratory volume in one second (FEV1) (ρ = 0.549; p = 0.0149). Conclusion: The AiDA method shows potential to be developed into a tool to assess conditions involving changes in distal airways, eg, emphysema. The intercept may reflect airway properties; this finding should be further investigated.


  • Radiology Diagnostics, Malmö
  • Medical Radiation Physics, Malmö
  • Ergonomics and Aerosol Technology
  • Clinical Physiology, Malmö

Publishing year







International Journal of Nanomedicine



Document type

Journal article


Dove Medical Press Ltd.


  • Respiratory Medicine and Allergy
  • Radiology, Nuclear Medicine and Medical Imaging


  • Airspace dimension assessment with nanoparticles
  • Distal airspaces
  • Magnetic resonance densitometry
  • Nanoparticles
  • Respiratory diagnostics



Research group

  • Radiology Diagnostics, Malmö
  • Medical Radiation Physics, Malmö
  • Clinical Physiology, Malmö


  • ISSN: 1176-9114