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Area of Science:

  • Nuclear medicine
  • Radiology
  • Pulmonary physiology

Background:

  • Single-photon emission computed tomography/computed tomography (SPECT/CT) enables precise lung lobe delineation.
  • Assessing individual lung lobe function is crucial for understanding overall pulmonary health.
  • The use of specific ventilation (Technegas) and perfusion (macro-aggregated albumin microspheres) agents allows for fixed deposition studies.

Purpose of the Study:

  • To establish normal ranges for the functional contribution of individual lung lobes to overall lung function.
  • To investigate the impact of patient posture (supine vs. erect) on lung lobe ventilation and perfusion.
  • To compare functional lobar contributions with anatomical volumes derived from CT scans.

Main Methods:

  • Utilized SPECT/CT for ventilation and perfusion lung imaging in a cohort of normal subjects.
  • Employed Technegas for ventilation and radiolabeled macro-aggregated albumin microspheres for perfusion.
  • Acquired scans in both supine and erect positions to assess postural effects on lung function.

Main Results:

  • Demonstrated accurate delineation of individual lung lobes using SPECT/CT.
  • Observed differences between anatomical lobar volumes and their functional contributions in different positions.
  • Reported normal ranges for lobar ventilation and perfusion in supine and erect postures.

Conclusions:

  • SPECT/CT provides a minimally invasive and readily available method for assessing lobar lung function.
  • Patient posture significantly influences the distribution of ventilation and perfusion within the lung lobes.
  • The findings support performing clinical lung function studies in the upright position, mirroring standard pulmonary function tests.