[Mrtrix-discussion] FA and ADC values for a tract

[Helen Carlson]

Hello all,
I would like to determine the average FA and ADC values for a given track (in this case, the arcuate). So I followed previous directions posted here and have used the following commands on my arcuate which successfully creates a probability mask for FA and ADC:

tracks2prob -template fa.mif Arcuate.tck FA_mask.mif
tracks2prob -template adc.mif Arcuate.tck ADC_mask.mif

I then used mrstats to get the average, max, min etc of the tracks by using these commands:

mrstats fa.mif -mask FA_mask.mif
mrstats adc.mif -mask ADC_mask.mif

Which also seemed to work except that I was expecting my FA to range from 0.1 to 1.0 (approximately). Instead, the FA values have a min of 0 and a max of 1.13. In addition, my ADC values have a negative minimum (-0.0024). It seems these values are out of range and do not make sense but I do not know what I am doing wrong.

Thanks in advance for any help
Helen


Helen Carlson, Ph.D
Neuroimaging Research Associate
Calgary Pediatric Stroke Program & Neuropsychology
Alberta Children's Hospital

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