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Diffusion tensor trace mapping in normal adult brain using single-shot epi technique: A methodological study of the aging brain
| Content Provider | Scilit |
|---|---|
| Author | Li, T. - Q. Chen, Z. G. Hindmarsh, T. |
| Copyright Year | 2001 |
| Description | Purpose: To quantify age-related changes of the average diffusion coefficient value in normal adult brain using orientation-independent diffusion tensor trace mapping and to address the methodological influences on diffusion quantification. Material and Methods: Fifty-four normal subjects (aged 20-79 years) were studied on a 1.5-T whole-body MR medical unit using a diffusion-weighted single-shot echo-planar imaging technique. Orientation-independent diffusion tensor trace maps were constructed for each subject using diffusion-weighted MR measurements in four different directions using a tetrahedral gradient combination pattern. The global average (including cerebral spinal fluid) and the tissue average of diffusion coefficients in adult brains were determined by analyzing the diffusion coefficient distribution histogram for the entire brain. Methodological influences on the measured diffusion coefficient were also investigated by comparing the results obtained using different experimental settings. Results: Both global and tissue averages of the diffusion coefficient are significantly correlated with age (p<0.03). The global average of the diffusion coefficient increases 3% per decade after the age of 40, whereas the increase in the tissue average of diffusion coefficient is about 1% per decade. Experimental settings for self-diffusion measurements, such as data acquisition methods and number of b-values, can slightly influence the statistical distribution histogram of the diffusion tensor trace and its average value. Conclusion: Increased average diffusion coefficient in adult brains with aging are consistent with findings regarding structural changes in the brain that have been associated with aging. The study also demonstrates that it is desirable to use the same experimental parameters for diffusion coefficient quantification when comparing between different subjects and groups of interest. |
| Related Links | http://acr.sagepub.com/content/42/5/447.full.pdf |
| Ending Page | 458 |
| Page Count | 12 |
| Starting Page | 447 |
| ISSN | 02841851 |
| e-ISSN | 16000455 |
| DOI | 10.1080/028418501127347160 |
| Journal | Acta Radiologica |
| Issue Number | 5 |
| Volume Number | 42 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2001-09-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Acta Radiologica Radiology, Nuclear Medicine and Imaging Tensor Trace Diffusion Tensor Normal Trace Mapping Epi Technique Aging Brain Methodological Study |
| Content Type | Text |
| Resource Type | Article |
| Subject | Radiology, Nuclear Medicine and Imaging Radiological and Ultrasound Technology |
