Spiral cine DENSE MRI demonstrated that the anterior abdominal aortic wall exhibits the greatest displacement (1.5 ± 0.7 mm), while the lateral wall experiences the largest circumferential strain.
Observational (n=17)
Does spiral cine DENSE MRI detect regional variation in abdominal aortic wall displacement and strain in healthy adults?
Spiral cine DENSE MRI demonstrates significant circumferential heterogeneity in the abdominal aortic wall, with the anterior wall showing greatest displacement and lateral walls showing largest circumferential strain.
BACKGROUND: Knowledge of tissue properties of the abdominal aorta can improve understanding of vascular disease and guide interventional approaches. Existing MRI methods to quantify aortic wall displacement and strain are unable to discern circumferential heterogeneity. PURPOSE: To assess regional variation in abdominal aortic wall displacement and strain as a function of circumferential position using spiral cine displacement encoding with stimulated echoes (DENSE). STUDY TYPE: Prospective. POPULATION: Cardiovascular disease-free men (n = 8) and women (n = 9) ages 30-42. SEQUENCES: Prospective electrocardiogram (ECG)-gated and navigator echo-gated spiral, cine 2D DENSE and retrospective ECG-gated phase contrast MR (PCMR) sequences at 3T. ASSESSMENT: In-plane displacement values of the aortic wall acquired with DENSE were used to determine radial and circumferential aortic wall motion. A quadrilateral-based 2D strain calculation method was implemented to determine strain from the displacement field. Peak displacement and its radial and circumferential contributions as well as peak circumferential strain were compared among eight circumferential wall segments. Distensibility was calculated using PCMR and compared with homogenized circumferential strain. STATISTICAL TESTS: To account for repeated measurements in volunteers, linear mixed models for mean sector values were created for displacement magnitude, circumferential displacement, radial displacement, and circumferential strain. Comparisons were made between sectors. Calculated distensibility and homogenized circumferential strain were compared using Bland-Altman analysis. Statistical significance was defined as P < 0.05. RESULTS: Displacement was highest in the anterior wall (1.5 ± 0.7 mm) and was primarily in the radial as compared with circumferential direction (1.04 ± 0.05 mm vs. 0.81 ± 0.42 mm). Circumferential strain was highest in the lateral walls (left 0.16 ± 0.05 and right 0.21 ± 0.12) with homogenized circumferential strain of 0.14 ± 0.05. DATA CONCLUSION: DENSE imaging in the abdominal aortic wall demonstrated that the anterior aortic wall exhibits the greatest displacement, while the lateral wall experiences the largest circumferential strain. LEVEL OF EVIDENCE: 3 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2019;49:731-743.
Iffrig et al. (Mon,) conducted a observational in Cardiovascular disease-free (n=17). Spiral cine displacement encoding with stimulated echoes (DENSE) MRI was evaluated on Regional variation in abdominal aortic wall displacement and strain as a function of circumferential position. Spiral cine DENSE MRI demonstrated that the anterior abdominal aortic wall exhibits the greatest displacement (1.5 ± 0.7 mm), while the lateral wall experiences the largest circumferential strain.
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