Detection of chronic lung allograft dysfunction using ventilation-weighted Fourier decomposition MRI.

Area of Science:

• Medical Imaging
• Pulmonary Medicine
• Transplantation Science

Background:

• Chronic lung allograft dysfunction (CLAD) is a major complication following lung transplantation, leading to significant morbidity and mortality.
• Current diagnostic methods rely on spirometry, which can be challenging in advanced CLAD stages.

Purpose of the Study:

• To evaluate the efficacy of Fourier decomposition magnetic resonance imaging (FD-MRI) in detecting and assessing CLAD in patients post-bilateral lung transplantation (DLTx).

Main Methods:

• FD-MRI was performed on 62 DLTx recipients using a 1.5-T MR scanner.
• Regional fractional ventilation (RFV) was quantified, and parameters like volume defect percentage (VDP), median lung RFV, and quartile coefficient of dispersion (QCD) were calculated.
• Radiologists were blinded to clinical status during image analysis.

Main Results:

• FD-MRI parameters, particularly VDP1, were significantly higher in patients with CLAD (P < .001).
• Increased VDP1 (>2%) correlated with reduced graft survival, independent of dysfunction severity (P = .005).
• VDP2 effectively distinguished between the presence and absence of CLAD (AUC = 0.71; P = .03), and QCD increased with disease progression (P < .001).

Conclusions:

• FD-MRI-derived parameters offer a quantitative approach for diagnosing and assessing CLAD after DLTx.
• This imaging technique shows potential for early detection and monitoring of CLAD, potentially improving patient outcomes.