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Development and evaluation of a comprehensive array of gray matter labels for the MIITRA atlas: Interoperability with complementary atlases
Mohammad Rakeen Niaz1, Abdur Raquib Ridwan1, Yingjuan Wu1, Shengwei Zhang2, David A. Bennett2, and Konstantinos Arfanakis1,2
1Biomedical Engineering, Illinois Institute of Technology, Chicago, IL, United States, 2Rush Alzheimer's Disease Center, Rush University Medical Center, Chicago, IL, United States

Synopsis

The Multichannel Illinois Institute of Technology & Rush university Aging (MIITRA) atlas constructed using high quality MRI data on a large (N=400), diverse, community cohort of non-demented older adults, contains high resolution (0.5mm isotropic) structural and diffusion tensor imaging templates. The purpose of this work was to build and evaluate a comprehensive array of gyral-based, cytoarchitecture-based, and functional connectivity-based gray matter labels in MIITRA space in order to enhance the functionality of the MIITRA atlas and its interoperability with complementary atlases.

INTRODUCTION

The Multichannel Illinois Institute of Technology & Rush university Aging (MIITRA)[1] atlas constructed using high quality MRI data on a large (N=400), diverse, community cohort of non-demented older adults, contains high resolution (0.5mm) structural and diffusion tensor imaging templates. The purpose of this work was to build and evaluate a comprehensive array of gyral-based, cytoarchitecture-based, and functional connectivity-based gray matter labels in MIITRA space in order to enhance the functionality of the MIITRA atlas and its interoperability with complementary atlases. [KA1]Reference Ridwan’s paper

METHODS

Data and preprocessing:
T1w images from the 400 older adults included in the construction of the MIITRA atlas (50% male; 64.9-98.9 years of age; 54% white, 43% black) were processed with Freesurfer’s[2] standard recon-all pipeline. The Freesurfer outputs for all images were manually edited. Parcellations from Yeo[3], Desikan-Killiany[4], HCP-MMP[5], Brainnetome[6], Brodmann[7], Destrieux[8], Campbell[9], Flechsig[10], Mindboggle[11], Kleist[12], Smith[13], and EconomoCT[14,15] atlases were projected onto the surface of each image and then converted to volumetric labels for each image. The T1w images were also nonlinearly registered using ANTs[16] SyN to the MNI152 6th gen[17], MNI Colin[18], and the MNI 2009b[19] templates, and volumetric labels from Harvard-Oxford[20], Julich[21], AAL3[22], Buckner[23], CoBrALab[24], CAREN[25], Striatum subdivision[26] and Hippocampus subdivisions[26] atlases were warped to the space of each image. The same approach was followed for a separate group of 100 older adults participating in the same studies of aging as the persons included in MIITRA (age-range 65-95, male-female ratio 40:60) to serve as reference labels in the evaluation process.
Construction of gray matter labels
The gray matter labels of the 400 individuals included in the development of the MIITRA atlas were transformed from raw space to exact physical locations in MIITRA space using the ANTs-derived forward transformations that were applied on individual T1w images to build the MIITRA T1w template[27]. The label of a 0.5mm isotropic voxel in MIITRA space was then calculated using majority voting among all the labels that were mapped to that voxel. This technique was applied to every set of labels mentioned above, generating a comprehensive array of complementary gray matter labels in MIITRA space (Fig.1).

Evaluation
T1w images from the 100 older adults of the evaluation group were nonlinearly normalized to the 0.5mm MIITRA T1w template and the inverse transformation was applied to the gray matter labels of the MIITRA atlas to transform them to each individual’s space. For each individual, the warped gray matter labels from the MIITRA atlas were compared to the corresponding reference labels. The comparison was conducted within an individual’s gray matter mask. First, the overlap between warped and reference labels was evaluated using the Dice coefficient, Jaccard coefficient, sensitivity, and specificity. Next, the geometry of the labels was compared using the average volume of each label. Then the label dissimilarity was assessed using the volume error.

RESULTS

Examples of the gray matter labels in MIITRA space are shown in Figure 1. The measures of overlap between the warped and reference labels for each set of labels were generally high, with an average Dice coefficient of 0.78±0.3, average Jaccard coefficient of 0.59±0.27 (Fig.2), sensitivity of 0.74±0.1, and specificity of 0.86±0.35 (Fig.3). The geometry of the warped labels showed a high correlation with the geometry of the reference labels both in terms of the average volume of each label (correlation coefficient = 0.997, p-value < 10-10) (Fig.4). The values of dissimilarity between the warped and reference labels were low, with an average volume error of 0.38±0.2.

DISCUSSION

A comprehensive array of complementary gray matter labels were constructed for the MIITRA atlas in this work. These labels include gyral-based, cytoarchitecture-based, and functional connectivity-based labels which will enhance the functionality of the MIITRA atlas. The new labels will also enhance the interoperability of MIITRA with the source atlases. In the evaluation, the gray matter labels in the MIITRA atlas showed high overlap, high geometric correlation, and low dissimilarity with the reference labels, demonstrating that there is a high agreement between the labels obtained from the MIITRA atlas and the reference labels from the source atlases.

CONCLUSION

This work developed a comprehensive array of complementary gray matter labels for the MIITRA atlas. These labels, in combination with the high-resolution templates of the atlas, may become particularly useful resources in neuroimaging studies of the aging brain.

Acknowledgements

This study was supported by:

National Institute on Aging (NIA) R01AG052200

National Institute on Aging (NIA) P30AG010161

National Institute on Aging (NIA) P30AG072975

National Institute on Aging (NIA) R01AG017917

National Institute on Aging (NIA) RF1AG022018

National Institute on Aging (NIA) R01AG056405

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Figures

Figure 1: Axial slices of the MIITRA T1w and DTI templates, gray matter labels in MIITRA atlas space

Box plots of the (A) Dice coefficient and (B) Jaccard coefficient for the overlap between the gray matter labels in MIITRA space warped to an individual’s space and the manually edited reference labels in that individual’s space.

Box plots of the (A) sensitivity and (B) specificity for the overlap between the gray matter labels from MIITRA space warped to an individual’s space and the manually edited reference labels in that individual’s space

Box plots of the (A) volume error for the overlap between the gray matter labels from MIITRA space warped to an individual’s space and the manually edited reference labels in that individual’s space.

Plots of the (A) average volume in mm3 of the gray matter labels warped from MIITRA space to an individual’s space and the manually edited reference labels in that individual’s space. The values have been log-transformed for better visualization

Proc. Intl. Soc. Mag. Reson. Med. 30 (2022)
4854
DOI: https://doi.org/10.58530/2022/4854