T1 Mapping In Differentiating Healthy And Pathological Myocardium

Area of Science:

• Cardiovascular Imaging
• Medical Physics
• Diagnostic Cardiology

Background:

• Establishing standardized native T1 mapping is crucial for accurate cardiac assessment.
• Evaluating different measurement locations and techniques is necessary to optimize diagnostic performance.
• Comparing non-ischemic dilated cardiomyopathy (NIDCM) and hypertrophic cardiomyopathy (HCM) against controls aids in understanding disease-specific T1 alterations.

Purpose of the Study:

• To identify the optimal measurement location and technique for native T1 mapping.
• To establish a standardized approach for native T1 quantification.
• To evaluate the diagnostic performance of various T1 mapping measurement approaches in differentiating NIDCM and HCM from controls.

Main Methods:

• Retrospective review of 143 patients (61 NIDCM, 60 HCM, 22 controls) who underwent 1.5T cardiac magnetic resonance (CMR).
• Acquisition of native T1 mapping in basal, midventricular, and apical short-axis slices with regions of interest in the whole left ventricular myocardium (SAX) and interventricular septum.
• Investigation of diagnostic yield and optimal cut-off values for native T1 to differentiate myocardial conditions.

Main Results:

• Native T1 values were significantly higher in both NIDCM and HCM groups compared to controls (p<0.05).
• Basal SAX and basal septal measurements demonstrated the highest diagnostic accuracy.
• T1 values differentiated healthy from diseased myocardium with 86% accuracy for NIDCM and 73.4% for HCM, correlating with systolic function and remodeling.

Conclusions:

• A streamlined single-slice native T1 mapping acquisition with a septal measurement technique achieves diagnostic performance comparable to multi-slice protocols.
• This optimized approach reduces measurement heterogeneity, leading to a more time-efficient workflow and improved patient comfort.
• The standardized septal measurement technique enhances diagnostic accuracy for native T1 mapping in cardiomyopathies without compromising clinical utility.