Morphological And Functional Assessment Of The Uterus: "One-Stop Shop Imaging" Using A Compressed-Sensing Accelerated, Free-Breathing T1-Vibe Sequence

Background The combination of motion-insensitive, high-temporal, and spatial resolution imaging with evaluation of quantitative perfusion has the potential to increase the diagnostic capabilities of magnetic resonance imaging (MRI) in the female pelvis. Purpose To compare a free-breathing compressed-sensing VIBE (fbVIBE) with flexible temporal resolution (range = 4.6-13.8 s) with breath-hold VIBE (bhVIBE) and to evaluate the potential value of quantifying uterine perfusion. Material and Methods A total of 70 datasets from 60 patients (bhVIBE: n = 30; fbVIBE: n = 40) were evaluated by two radiologists. Only temporally resolved reconstruction (fbVIBE) was performed on 30 of the fbVIBE datasets. For a subset (n = 10) of the fbVIBE acquisitions, a time- and motion-resolved reconstruction (mrVIBE) was evaluated. Image quality (IQ), artifacts, diagnostic confidence (DC), and delineation of uterine structures (DoS) were graded on Likert scales (IQ/DC/DoS: 1 (non-diagnostic) to 5 (perfect); artifacts: 1 (no artifacts) to 5 (severe artifacts)). A Tofts model was applied for perfusion analysis. Ktrans was obtained in the myometrium (Mm), junctional zone (Jz), and cervix (Cx). Results The median IQ/DoS/DC scores of fbVIBE (4/5/5 kappa >0.7-0.9) and bhVIBE (4/4/4; kappa = 0.5-0.7;P > 0.05) were high, but Artifacts were graded low (fbVIBE/bhVIBE: 2/2; kappa = 0.6/0.5;P > 0.05). Artifacts were only slightly improved by the additional motion-resolved reconstruction (fbVIBE/mrVIBE: 2/1.5;P = 0.08); fbVIBE was preferred in most cases (7/10). Significant differences of Ktrans values were found between Cx, Jz, and Mm (0.12/0.21/0.19;P < 0.05). Conclusion The fbVIBE sequence allows functional and morphological assessment of the uterus at comparable IQ to bhVIBE.