imgcorrl 0.2.4 © 2005,2007 by Turku PET Centre
Calculation of correlation between two (parametric) PET images in
ECAT 6.3 or ECAT 7 format.
Usage:
imgcorrl [Options] <Image #1> <Image #2> <Result file>
e.g.: imgcorrl ua2918dvr.img ua2918bp.img ua2918cor.res
Options:
-diff
Difference between pixel values (#2 - #1) is compared to the mean,
as suggested by Bland & Altman (1)
-resid=<filename>
Residuals (predicted_image2 - image2) are calculated for each pixel,
then forced in between -restr*SD and +restr*SD, and saved in
specified file in the same format as image1 (2)
-scaled
Residuals are scaled to 0-100
-pred=<filename>
predicted_image2 is saved in specified file
-restr=<limit>
Restriction limits for residuals can be changed with this option;
By default, restr=2.0
-L1=<lower limit>
Pixels whose values in image #1 are less than limit are excluded
from correlation
-L2=<lower limit>
Pixels whose values in image #2 are less than limit are excluded
from correlation
-lowthr=<lower threshold%>
Set lower cut-off threshold (percent of maximum)
-upthr=<upper threshold%>
Set upper cut-off threshold (percent of maximum)
-f1=<frame>
If image #1 contains more than one time frame, the frame used in
correlation can be specified with this option; 1 by default
-f2=<frame>
If image #2 contains more than one time frame, the frame used in
correlation can be specified with this option; 1 by default
-pf=<filename>
Pixel values are written in ASCII file as two columns for plotting
with other software. Warning: file may be too large for most programs
-h or --help
Print this message and exit
--version or --build
Print software build information and exit
--silent
Program works silently, printing only error and warning messages.
References:
1. Bland JM, Altman DG. Statistical methods for assessing agreement
between two methods of clinical measurement. Lancet 1986; i: 307-310.
2. Naum A, Oikonen V, Sundell J, Engblom E, Koistinen J, Ylitalo A,
Någren K, Airaksinen J, Iozzo P, Nuutila P, Knuuti J. Additional Visual
Analysis Tool (AVAT) in PET imaging. (manuscript).
See also:
ecat2flo,
imgpext,
rescoll,
imgshrink,
e7vplavg,
ecatcalc,
ecat2tif
Keywords: image, modelling, correlation, residual, linear regression
This program comes with ABSOLUTELY NO WARRANTY. This is free software, and
you are welcome to redistribute it under GNU General Public License.
