LUng voluMe reductIoN by DuAl ENergy CT Evaluation (LUMINANCE) Study

Inclusion Criteria: * Adult patients (≥ 18 years of age at the time of written informed consent) with emphysema who have been deemed appropriate candidates for bronchoscopic lung volume reduction Exclusion Criteria: * Patients unable to provide consent * Patients who are pregnant or nursing * Women of child-bearing age will undergo pregnancy tests based on University Hospital (UH) standard bronchoscopy pre-procedural testing * Patients unable to undergo a DECT chest (contraindications to a CT chest with intravenous contrast such as a reported or documented allergy to intravenous (IV) contrast or impaired renal function, defined as the following: * Glomerular filtration rate (GFR) \<90 ml/min/1.73 m2 at the time of initial evaluation if patient age is ≤ 59 years * GFR \<85 ml/min/1.73 m2 if patient age is 60-69 years * GFR \<75 ml/min/1.73 m2 if patient age is ≥70 years