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DTI vibration artifact

DTI vibration artifact. FA map: No correction. FA map same subject, no artifact. DTI vibration artifact: No correction. Fstat of the tensor model. Tensor residuals associated with (1, 0, 0). DTI vibration artifact. FA map. Fstat map.

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DTI vibration artifact

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  1. DTI vibration artifact FA map: No correction FA map same subject, no artifact

  2. DTI vibration artifact: No correction Fstat of the tensor model Tensor residuals associated with (1, 0, 0)

  3. DTI vibration artifact FA map Fstat map Fitting the using all of the data, but including a noise term in the model (Rician noise)

  4. DTI vibration artifact FA map Fstat map Fitting the tensor by throwing out the data associated with the artifact (bxx>0.6) In this subject, this was 23 out of 64 directions

  5. DTI vibration artifact Ratio of actual data:predicted data within the artifact region In the manuscript, the authors used a = 0.61 and b=0.54 (shown in red)

  6. DTI vibration artifact FA map Fitting the using all of the data, but including a regressor in the model using the method described in the manuscript

  7. Comparisons against same subject scanned without the artifact: differences in FA Removing data No correction Rician noise FSL regressor Mean absolute value difference in FA in a mask of the artifact: NC: 0.236 > Noise: 0.181 > Regressor: 0.167 > Remove: 0.086

  8. Comparisons against same subject scanned without the artifact: difference in the direction of primary eigenvector Removing data No correction Rician noise FSL regressor Mean difference in angle of primary eigenvector (degrees) in a mask of the artifact NC: 57.6 > Noise: 57.4 > Regressor: 55.7 > Remove: 47.5

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