Abstract
Purpose
It has long been thought that the acoustic radiation (AR) white matter fibre tract from the medial geniculate body of the thalamus to the Heschl’s gyrus cannot be reconstructed via single-fibre analysis of clinical diffusion tensor imaging (DTI) scans. A recently developed single-fibre probabilistic method suggests otherwise. The method uses dynamic programming (DP) to compute the most probable paths between two regions of interest. This study aims to observe the ability of single-fibre probabilistic analysis via DP to visualise the AR in clinical DTI scans from legacy pilot cohorts of subjects with normal hearing (NH) and profound hearing loss (HL).
Methods
Single-fibre probabilistic analysis via DP was applied to reconstruct 3D models of the AR in the two cohorts. DTI and T1 data at 1.5 T for subjects with NH (n = 11) and HL (n = 5), as well as 3 T for NH (n = 1) and HL (n = 1), were used.
Results
The topographical features of AR previously observed in post-mortem and multi-fibre analyses can be visualised in DTI scans of 16 subjects and 2 atlases with a success rate of 100%. Relative to MNI coordinates, there was no significant difference in the varifold distances between the topography of the tracts in the 1.5 T cohort.
Conclusion
The AR can be visualised in clinical 1.5 T and 3 T DTI scans using single-fibre probabilistic analysis via DP, hence, the potential for DP to visualise the AR in medical and pre-surgical applications in pathologies such as vestibular schwannoma, multiple sclerosis, thalamic tumours and stroke as well as hearing loss.
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Abbreviations
- AR:
-
Acoustic radiation
- DP:
-
Dynamic programming
- FA:
-
Fractional anisotropy
- HL:
-
Hearing loss
- HG:
-
Heschl’s gyrus
- LSL:
-
Listening and spoken Language
- MGB:
-
Medial geniculate body
- NH:
-
Normal hearing
- PTA:
-
Average pure tone audiogram
- ROI:
-
Region of interest
- WM:
-
White matter
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Acknowledgements
The 1.5 T and 3 T scans for the HL subjects were acquired with assistance of Dr. Boatman and Dr. Rapp respectively. Technical support from Drs. Ceritoglu and Mori is also appreciated.
Funding
The 1.5 T scans for the HL subjects were acquired via a grant from the National Organization for Hearing Research. Scans and atlases for the NH subjects were acquired via NIH/NIBIB Grant P41 EB015909. The work for processing and analysis was supported in part by the same NIH grant.
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JTR and AVF conceived the idea and design of the study and supervised data collection and interpretation. SBD, KSK, LY and ML carried out the study and data collection, analysis and interpretation. SBD and JTR drafted the manuscript. All authors participated in study design and data interpretation, and provided critical manuscript revisions, read and approved the final manuscript.
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The retrospective imaging studies involving human subjects were previously approved by institutional review boards for Johns Hopkins Medical Institutions and Kennedy Krieger Institute.
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APPENDIX
APPENDIX
It is instructive to assess the axonal and myelination abnormalities of the AR and volumes of the HG in people with HL. Thus, from the binary segmentations of the left and right HG, volumes were calculated, and from the generated left and right AR, fractional anisotropy (FA) values were calculated at each voxel from the eigenvalues [8]. For the 1.5 T cohort only, the FA values were in the NH, and HL groups were compared using the Wilcoxon-Rank Sum test with 95% confidence interval due to the small sample size and reported with asymptomatic p values with continuity correction. FA values of the AR and HG volumes from subjects with NH (n = 10) and HL (n = 5) are shown in Fig. 4. In the NH group, the FA for the left AR is larger than in the right (0.43 and 0.41, respectively; p value 0.054). The HG volume of the right HG is significantly larger in the HL group compared with the NH group (1122 mm3 and 909 mm3 respectively; p value 0.019).
The lower FA values are similar to those reported with similar age and hearing loss [62,62,64]. Lower but not significantly different FA values were also noted in children and adults prior to cochlear implantation [65, 66]. Similarly, lower FA bilaterally for patients with acoustic neuromas [67] has been reported and may be associated with degenerative changes seen in older adults [68]. Also, low values were obtained from tracts originating in the inferior colliculus and terminating in the auditory cortex [15], and therefore, comparisons cannot be made, but these lower FA values need to be reconciled with the larger HG volumes observed bilaterally [69,69,71] which may be a consequence of the altered synaptic pruning in the developing auditory cortex [72]. Finally, an unpublished study [73] also reported a reduction bilaterally in FA in subjects with congenital HL who used sign language. Therefore, the results highlight the importance of understanding the effects of LSL and sign language on WM properties of the AR.
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Dhir, S.B., Kutten, K.S., Li, M. et al. Visualising the topography of the acoustic radiation in clinical diffusion tensor imaging scans. Neuroradiology 62, 1157–1167 (2020). https://doi.org/10.1007/s00234-020-02436-6
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DOI: https://doi.org/10.1007/s00234-020-02436-6