Conclusionsĭiffusion data can be assessed by volume tractography, standard tractography and manual segmentation with high interrater reliability. Significant differences for the factor muscle in all examined diffusion parameters were shown in muscles using all methods (main effect p < 0.001). The highest interrater reliability was found for volume-based tractography (ICC ≥ 0.967). Interrater reliability for all methods was found to be excellent. Ability to assess intramuscular variance was compared using an ANOVA with muscle as a between-subjects factor. All three methods were performed by two independent raters to assess interrater reliability by ICC analysis and Bland-Altman plots. These metrics were evaluated in six thigh muscles using volume-based tractography, manual segmentation and standard tractography. Diffusion-weighted images were acquired to obtain DTI metrics. Materials and methodsģ0 volunteers underwent an MRI examination in a 3 T scanner using a 16-channel Torso XL coil. To evaluate diffusion metrics obtained using three different methods-volume-based tractography, manual segmentation-based analysis and tract-based analysis-with respect to their interrater reliability and their ability to detect intramuscular variance. Recently methods such as volume-based tractography have been applied to optimize muscle architecture estimation, but can also be used to assess DTI metrics. The commonly used methods to assess DTI metrics in muscles are manual segmentation and tract-based analysis. Ultrasound and DTI studies have shown intramuscular differences, and therefore separation of different muscles for analysis is essential. ).Muscle diffusion tensor imaging (mDTI) is a quantitative MRI technique that can provide information about muscular microstructure and integrity. Segmentation of skeletal muscle in thigh dixon MRI Based on texture analysis (Published online 2019. Intra-rater and inter-rater reliability of quantitative thigh muscle magnetic resonance imaging. Schroeder J, Tobler P, Stalder A-L, et al. Global T2 versus water T2 in NMR imaging of fatty infiltrated muscles: different methodology, different information and different implications. Quantitative Dixon MRI sequences to relate muscle atrophy and fatty degeneration with range of motion and muscle force in brachial plexus injury. ĭuijnisveld BJ, Henseler JF, Reijnierse M, et al. Quantitative muscle MRI: A powerful surrogate outcome measure in Duchenne muscular dystrophy. ©2021 Gaetano Conte Academy - Mediterranean Society of Myology, Naples, Italy.īonati U, Hafner P, Schädelin S, et al. Muscle MRI neuromuscular diseases qMRI reproducibility segmentation. The muscles that showed the least reproducibility were the semimembranosus and the short head of the biceps femoris.įollowing specific recommendations such as these ones derived from our single-center experience leads to an overall high reproducibility of manual muscle segmentation and is helpful in improving both intra-operator and inter-operator reproducibility in less experienced operators. Confidence interval (CI) analysis showed that the most experienced operator also had the least variability in drawing the ROIs, whereas OP2 showed both higher intra-operator reproducibility compared to OP3 and higher inter-operator agreement with OP1. The highest inter-operator agreement was observed between Operators 1 and 2 (0.814) and the lowest between OP2 and OP3 (0.702). OP1 showed the highest average intra-operator DSC values (0.885), whereas OP2 had higher average DSC (0.856) compared to OP3 (0.818). Intra- and inter-operator Dice similarity coefficient (DSC) was calculated. Muscle segmentation was performed by three operators: an expert operator (OP1) with 3 years of experience and two radiology residents (OP2 and 3) who were both given basic segmentation instructions, whereas only OP2 underwent additional supervised training from OP1. Nine healthy volunteers underwent a muscle MRI examination that included a TSE T2 sequence of the thighs. To assess the reproducibility of a manual muscle MRI segmentation method that follows a specific set of recommendations developed in our center.
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