imgdv - tpcclib 0.7.8 © 2022 by Turku PET Centre
Calculates the distribution volume (Vt, DV) or distribution volume ratio (DVR)
from dynamic PET image in ECAT, NIfTI-1, or Analyze 7.5 format,
applying the multiple time graphical analysis (MTGA) approach for reversible
tracer uptake (Logan plot) (1, 2, 3).
Simple non-iterative perpendicular line fitting algorithm (4) is applied
in determination of the slope of the Logan plot.
Usage: imgdv [Options] input image starttime resultimage
Input can be either a TAC file containing arterial plasma PTAC or reference
region TTAC. Data must be in the same concentration units as the data in
image, and times in min; however, if units are specified inside the input
and image file, the program can automatically convert units.
Start time of the linear fit must be given in minutes; set to zero to
let the program automatically determine the start time (not recommended).
-k2=<k2 of reference region>
With reference region input it may be necessary to specify also the
population average for reference region k2 (2).
Pixels with AUC less than (threshold/100 x input) are set to zero.
Default is 0 %.
Upper limit for Vt or DVR values; by default max is set pixel-wise
to 10 times the AUC ratio.
Lower limit for Vt or DVR values; 0 by default.
Remove parametric pixel values that are over 4x higher than
their closest neighbours.
-end=<Fit end time (min)>
By default line is fitted to the end of data. Use this option to enter
the fit end time.
Y axis intercepts times -1 are written as an image in specified file.
Numbers of selected plot data points are written as an image.
Display usage information on standard output and exit.
Display version and compile information on standard output and exit.
-d[n], --debug[=n], --verbose[=n]
Set the level (n) of debugging messages and listings.
Suppress displaying normal results on standard output.
Suppress displaying anything except errors.
imgdv ua3818ap.kbq ua3818dy1.v 20 ua3818dv.v
The unit of pixel values in the parametric Vt image is
(mL plasma)/(mL tissue). Data in DVR image are unitless.
In theory, DVR equals BPnd+1, and therefore a binding potential image can
be computed from DVR image by subtraction of unity, e.g. using program
imgcalc. However, this may lead to a large number of pixels with negative
values that may hamper the further statistical or visual analysis.
1. Logan J, Fowler JS, Volkow ND, Wolf AP, Dewey SL, Schlyer DJ,
MacGregor RR, Hitzemann R, Bendriem B, Gatley SJ, Christman DR.
Graphical analysis of reversible radioligand binding from time-activity
measurements applied to [N-11C-methyl]-(-)-cocaine PET studies in human
subjects. J Cereb Blood Flow Metab 1990; 10: 740-747.
2. Logan J, Fowler JS, Volkow ND, Wang GJ, Ding YS, Alexoff DL.
Distribution volume ratios without blood sampling from graphical
analysis of PET data. J Cereb Blood Flow Metab. 1996; 16: 834-840.
3. Logan J. Graphical analysis of PET data applied to reversible and
irreversible tracers. Nucl Med Biol 2000; 27:661-670.
4. Varga J & Szabo Z. Modified regression model for the Logan plot.
J Cereb Blood Flow Metab 2002; 22:240-244.
See also: imgbfbp, imglhdv, img2tif, logan, imgki, imgcalc
Keywords: image, MTGA, Logan plot, modelling, Vt, DVR, distribution volume