A method for calibrating diffusion gradients in diffusion tensor imaging. Export

@article{citeulike:2138342, abstract = {OBJECTIVE: To calibrate and correct the gradient errors including gradient amplitude scaling errors, background/imaging gradients, and residual gradients in diffusion tensor imaging (DTI). METHODS: A calibration protocol using an isotropic phantom was proposed. Gradient errors were estimated by using linear regression analyses on quadratic functions of diffusion gradients along 3 orthogonal directions. A 6-element total effective scaling vector is generated from the calibration protocol to retrospectively correct gradient errors in DTI experiments. RESULTS: The accuracy of the calibration protocol was within 1\% or less in estimating gradient scaling errors. On both the brain study and the computer simulations, the retrospective correction minimized undesirable estimate biases of DTI measurements due to gradient errors. CONCLUSION: The protocol and retrospective correction are shown to be effective. The method may be used for prospective correction if actual diffusion-gradient waveforms are available. The methodology is expandable to general diffusion imaging schemes.}, address = {From the *Department of Radiology, {\dag}Waisman Laboratory for Brain Imaging and Behavior, and Departments of {\ddag}Psychiatry and {\S}Medical Physics, University of Wisconsin-Madison, Madison, WI.}, author = {Wu, Y. C. and Alexander, A. L.}, citeulike-article-id = {2138342}, citeulike-linkout-0 = {http://dx.doi.org/10.1097/rct.0b013e31805152fa}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/18043367}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=18043367}, doi = {10.1097/rct.0b013e31805152fa}, issn = {0363-8715}, journal = {Journal of computer assisted tomography}, keywords = {artefacts, calibration, dw-mri}, number = {6}, pages = {984--993}, posted-at = {2007-12-17 21:34:05}, priority = {4}, title = {A method for calibrating diffusion gradients in diffusion tensor imaging.}, url = {http://dx.doi.org/10.1097/rct.0b013e31805152fa}, volume = {31}, year = {2007} }

TY - JOUR ID - citeulike:2138342 L3 - citeulike-article-id:2138342 N2 - OBJECTIVE: To calibrate and correct the gradient errors including gradient amplitude scaling errors, background/imaging gradients, and residual gradients in diffusion tensor imaging (DTI). METHODS: A calibration protocol using an isotropic phantom was proposed. Gradient errors were estimated by using linear regression analyses on quadratic functions of diffusion gradients along 3 orthogonal directions. A 6-element total effective scaling vector is generated from the calibration protocol to retrospectively correct gradient errors in DTI experiments. RESULTS: The accuracy of the calibration protocol was within 1% or less in estimating gradient scaling errors. On both the brain study and the computer simulations, the retrospective correction minimized undesirable estimate biases of DTI measurements due to gradient errors. CONCLUSION: The protocol and retrospective correction are shown to be effective. The method may be used for prospective correction if actual diffusion-gradient waveforms are available. The methodology is expandable to general diffusion imaging schemes. IS - 6 JF - Journal of computer assisted tomography SN - 0363-8715 AD - From the *Department of Radiology, †Waisman Laboratory for Brain Imaging and Behavior, and Departments of ‡Psychiatry and §Medical Physics, University of Wisconsin-Madison, Madison, WI. EP - 993 TI - A method for calibrating diffusion gradients in diffusion tensor imaging. VL - 31 SP - 984 KW - artefacts KW - calibration KW - dw-mri AU - Wu, YC AU - Alexander, AL PY - 2007///c UR - http://dx.doi.org/10.1097/rct.0b013e31805152fa ER -