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Improved human brain tractographs using multi-shell q-ball diffusion magnetic resonance imaging compared with DTI | ||
| Journal of Advanced Medical Sciences and Applied Technologies | ||
| دوره 6، شماره 1، اسفند 2021، صفحه 14-23 اصل مقاله (778.07 K) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.30476/jamsat.2021.48382 | ||
| نویسندگان | ||
| Fatemeh Haghighi1؛ Marzieh Nezamzadeh* 2؛ Neda Mohammadi-Mobarakeh3 | ||
| 1Medical Physics Department, College of Medical Science, Tarbiat Modares University, 7 Jalal Al Ahmad Street, Tehran, Iran | ||
| 2Department of Radiology, Upstate Medical University, State University of New York, 750 E Adams st., Syracuse, NY 13210 | ||
| 3Medical Physics and Biomedical Engineering Department, Tehran University of Medical Sciences (TUMS), Tehran, Iran | ||
| چکیده | ||
| Introduction: Recently, it has been proven that assuming the Gaussian model in DTI method is inappropriate for propagation in a complex substrate such as human brain tissue. High Angular Resolution Diffusion Imaging (HARDI) (or so called q-ball imaging) is known as a model free method that allows to more accurately detect changes in diffusion with different orientations. In this study, after finding the best angle threshold at the Optic Radiation (OR) level, the length and number of reconstructed nerve fibers in this angle were measured using q-ball imaging and were compared with DTI. Materials and Method: Tractographs of q-ball images from the human brains of 10 healthy volunteers (30 to 50 years old) were studied using a 3-Tesla scanner. 64 directions of diffusion encoding in two b-values (1000 and 2000 s/mm2), were used for q-ball imaging and in routine b-value of 1000 s/mm2 for DTI. The tractographs were compared at the OR level with the tractography based on q-ball and DTI images. The results were analyzed using t-test. The angle threshold for tractography was selected at 45 degrees by comparing the tractographs in 13 angles. Conclusion: Consequently, the number and length of nerve fibers of OR, measured using the q-ball imaging, were significantly higher than those using the DTI. Finally, the better quality of the tractographs as well as the analyzed quantities, are indicators of larger signalto- noise ratio in q-ball imaging and indicate that q-ball imaging compared to DTI plays an important role in the development of brain nerve mapping. | ||
| کلیدواژه‌ها | ||
| MRI؛ Diffusion Tensor Imaging؛ Multi-shell Q-ball Imaging؛ Tractography | ||
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