title: Computed tomography-based biomarker provides unique signature for diagnosis of COPD phenotypes and disease progression.
abstract: Chronic obstructive pulmonary disease (COPD) is increasingly being recognized as a highly heterogeneous disorder, composed of varying pathobiology. Accurate detection of COPD subtypes by image biomarkers is urgently needed to enable individualized treatment, thus improving patient outcome. We adapted the parametric response map (PRM), a voxel-wise image analysis technique, for assessing COPD phenotype. We analyzed whole-lung computed tomography (CT) scans acquired at inspiration and expiration of 194 individuals with COPD from the COPDGene study. PRM identified the extent of functional small airways disease (fSAD) and emphysema as well as provided CT-based evidence that supports the concept that fSAD precedes emphysema with increasing COPD severity. PRM is a versatile imaging biomarker capable of diagnosing disease extent and phenotype while providing detailed spatial information of disease distribution and location. PRM's ability to differentiate between specific COPD phenotypes will allow for more accurate diagnosis of individual patients, complementing standard clinical techniques.
authors.affiliation: Department of Radiology, University of Michigan, Ann Arbor, MI, USA.
authors.forename: Craig J
authors.initials: CJ
authors.lastname: Galbán
authors.forename: Meilan K
authors.initials: MK
authors.lastname: Han
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Boes
authors.forename: Komal A
authors.initials: KA
authors.lastname: Chughtai
authors.forename: Charles R
authors.initials: CR
authors.lastname: Meyer
authors.forename: Timothy D
authors.initials: TD
authors.lastname: Johnson
authors.forename: Stefanie
authors.initials: S
authors.lastname: Galbán
authors.forename: Alnawaz
authors.initials: A
authors.lastname: Rehemtulla
authors.forename: Ella A
authors.initials: EA
authors.lastname: Kazerooni
authors.forename: Fernando J
authors.initials: FJ
authors.lastname: Martinez
authors.forename: Brian D
authors.initials: BD
authors.lastname: Ross
mesh_terms: D015415:Biomarkers; D003937:Diagnosis, Differential; D018450:Disease Progression; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008168:Lung / Q000000981:diagnostic imaging / Q000503:physiopathology; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis / Q000473:pathology; D011656:Pulmonary Emphysema / Q000175:diagnosis / Q000503:physiopathology; D012907:Smoking / Q000009:adverse effects; D014055:Tomography, Emission-Computed; D014057:Tomography, X-Ray Computed
chemical_list: D015415:Biomarkers