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adcfit

Section: User Commands (1)
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NAME

adcfit - Fits the apparent diffusion coefficient to diffusion MRI measurements.

SYNOPSIS

adcfit <data file> <scheme file>

DESCRIPTION

Reads diffusion MRI data, acquired using the acquisition scheme detailed in the scheme file, from the data file. The data file stores the diffusion MRI data in voxel order with the measurements stored as big-endian four-byte floats and ordered as in the scheme file. See modelfit(1) and camino(1) for the format of the data file and scheme file. The program fits the apparent diffusion coefficient to the measurements in each voxel and outputs the results, in voxel order and as big-endian eight-byte doubles, to the standard output. The program outputs three values in each voxel: [exit code, ln(S(0)), ADC]. An exit code of zero indicates no problems. For a list of other exit codes, see modelfit(1). The value of S(0) is an estimate of the signal at q=0.

This program is a simple interface to the program modelfit. The modelfit program provides more options for fitting the diffusion coefficient or tensor.

If the first command line argument is a hyphen (i.e. "-") the program reads data from the standard input.

EXAMPLES

Fit the apparent diffusion coefficient to the data in SubjectA.Bfloat using linear regression to the log measurements:

adcfit SubjectA.Bfloat A.scheme > ADC_A.Bdouble

Equivalently:

cat SubjectA.Bfloat | adcfit - A.scheme > ADC_A.Bdouble

modelfit -inversion -1 -schemefile A.scheme < SubjectA.Bfloat > ADC_A.Bdouble

AUTHORS

Daniel Alexander <camino@cs.ucl.ac.uk>

BUGS

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Time: 02:07:11 GMT, December 04, 2017

Adcfit