Abstract
The dataset presented in this paper is related to the recent work “Accuracy of electromyometrial imaging of uterine contractions in clinical environment” [1]. The dataset including body-uterus geometry obtained from magnetic resonance imaging (MRI), uterine electrograms and isochrone maps reconstructed using Electromyometrial imaging (EMMI) under various levels of deformations and electrical noise contamination in a translational sheep model are reported. The dataset make it possible for detailed evaluation and further improvement of EMMI. In addition, the researchers working on other types of electrophysiology imaging techniques, such as electrocardiographic imaging (ECGI), and Electrogastrography imaging (EGGI) could also adopt our method [1] and employ the dataset to evaluate and improve their imaging techniques.
Keywords: Electromyometrial imaging, Electromyograms, Sheep model, Isochrone maps, Geometry, Electrical noise
Subject | Biomedical Engineering |
Specific subject area | Electrophysiology; Imaging technique |
Type of data | Figures |
How data were acquired | Body-uterus geometry was imaged by Magnetic resonance imaging (MRI) and segmented using Amira software (Version 6.2). Electrograms and isochrone maps under deformation or electrical noise were reconstructed by Electromyometrial imaging (EMMI). |
Data format | Raw computational Analyzed |
Parameters for data collection | Images of uterus and abdomen were acquired using human MRI scanner from an anesthetized sheep. The sheep uterine electrograms were recorded during a surgical procedure to expose the sheep uterus [2]. Laplacian deformation algorithm was employed to simulate and generate geometrical changes under ideal elastic deformation conditions. |
Description of data collection | MRI images of uterus and abdomen were acquired using a radial VIBE fast T1-weighted sequence from an anesthetized sheep. MRI images were segmented and rendered to uterus and body mesh. The sheep uterus was exposed surgically, and an elastic sock containing 64 or 128 sintered Ag–AgCl electrodes was slipped over the uterus to record the electrograms at a 2 kHz sampling rate using Biosemi system [2]. Gaussian and Perline noise were simulated with the SNR = 17.5 dB. Maximum body-uterus deformation ratios simulated for Type I kick, Type II kick, contraction were 0.3, 0.3, 0.14, respectively. The standard deviation of deformation distance of fetal/maternal movements is 0.67 cm. |
Data source location | Washington University in St. Louis School of Medicine, St. Louis, Missouri, United States |
Data accessibility | The data are available with the article. |
Related research article | H. Wang, W. Wu, M. Talcott, S. Lai, R.C. McKinstry, P.K. Woodard, G.A. Macones, A.L. Schwartz, P.S. Cuculich, A.G. Cahill, Y. Wang, Accuracy of electromyometrial imaging of uterine contractions in clinical environment, Computers in biology and medicine, 116 (2020) 103543. doi:10.1016/j.compbiomed.2019.103543. [1]. |
Value of the Data
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1. Data
The dataset shows the pregnant sheep body-uterus geometry (Fig. 1), different types of electrical noise (Fig. 2), different types of geometrical deformations (Fig. 3), EMMI-reconstructed electrograms (Fig. 4), and isochrone maps (Fig. 5) under various geometrical deformations and electrical noises. These data were employed to evaluate the accuracy of EMMI in real complicated clinical environments and maternal/fetal motions [1].
2. Experimental design, materials, and methods
The experiment used Katahdin sheep as a model for human pregnancy considering their similar abdomen size as humans and respond to steroids to induce labor [2,5]. The sheep with gestation age around 140–145 days were obtained from the local farm. 24–48 hours before the MRI, sheep was intramuscularly administered with 16 mg dexamethasone. 1–2 hours before the MRI, sheep was shaved free of hair at the level of pelvis. Up to 256 MRI markers were applied around the lower abdomen and back of the sheep. MRI images were acquired from a 3T Siemens Prisma with radial volume interpolated breath-hold examination fast T1-weighted sequence. The resolution of the image is 1 mm × 1 mm x 3 mm. The body-uterus geometry (Fig. 1) was segmented from MRI images using Amira software. After the MRI, the sheep was transferred to operating room, where the uterine surface electrograms were recorded from up to 128 Biosemi unipolar electrodes. The detailed experiment procedure was reported in the previous work [1,2].
Gaussian and Perline noise were simulated with the SNR = 17.5 dB (Fig. 2). Body-uterus deformations were simulated and the maximum deformation ratios of Type I kick, Type II kick, contraction were 0.3, 0.3, 0.14, respectively. The standard deviation of deformation distance of fetal/maternal movement is 0.67 cm (Fig. 3). Combined the simulated noise and geometrical deformations with the measured uterine surface electrograms, the contaminated uterine surface electrograms were calculated (Fig. 4). The activation times of EMG burst near 300-s were calculated and assembled to the isochrone maps (Fig. 5).
Funding source
This work was supported by the March of Dimes (March of Dimes Prematurity Research Center, PI Macones) and by grants from National Institute of Child Health and Human Development (RO1HD094381; PIs Wang/Cahill); the National Institute on Aging (RO1AG053548; PIs Benzinger/Wang); and the BrightFocus Foundation (A2017330S; PI Wang).
Contributor Information
Alison G. Cahill, Email: alison.cahill@austin.utexas.edu.
Yong Wang, Email: wangyong@wustl.edu.
Conflict of Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
References
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