This is just the help documentation from the slice_overlay routine, described in the DisplaySlices page. The same help results from typing help slice_overlay at the matlab prompt.
Function to display + manage slice display
Slice display works on a global structure SO
with fields
- img - array of images to display
- img structs contain fields
type - one of {'truecolour' 'split', 'contour'};
truecolour - displays transparent (see prop) image
overlaid with any previous
split - in defined area, replaces image present (SPM
type activation display)
contour - contour map of image overlaid. See help
for contours function in matlab
vol - vol struct info (see spm_vol)
can also be vol containing image as 3d matrix
set with slice_overlay('AddBlobs'...) call
cmap - colormap for this image
nancol - color for NaN. If scalar, this is an index into
the image cmap. If 1x3 vector, it's a colour
prop - proportion of intensity for this cmap/img
func - function to apply to image before scaling to cmap
(and therefore before min/max thresholding. E.g. a func of
'i1(i1==0)=NaN' would convert zeros to NaNs
range - 2x1 vector of values for image to distribute colormap across
the first row of the colormap applies to the first
value in 'range', and the last value to the second
value in 'range'
outofrange - behavior for image values to the left and
right of image limits in 'range'. Left means
colormap values < 1, i.e for image values <
range(1), if (range(1)<range(2)), and image values >
range(1) where (range(1)>range(2)). If missing,
display min (for Left) and max (for Right) value from colormap.
Otherwise should be a 2 element cell array, where
the first element is the colour value for image values
left of 'range', and the second is for image values
right of 'range'. Scalar values for
colour index the colormap, 3x1 vectors are colour
values. An empty array attracts default settings
appropriate to the mode - i.e. transparent colour (where
SO.type is truecolour), or split colour. Empty cells
default to 0. 0 specifies that voxels with this
colour do not influence the image (split =
background, true = black)
hold - resampling order for image (see spm_sample_vol) -
default 1
background - value when resampling outside image - default
NaN
linespec - string, applies only to contour map,
e.g. 'w-' for white continuous lines
contours - vector, applies to contour map only, defines
values in image for which to show contours
(see help contours)
linewidth - scalar, width in points of contour lines
- transform - either - 4x4 transformation to apply to image slice position,
relative to mm given by slicedef, before display
or - text string, one of axial, coronal, sagittal
These orientations assume the image is currently
(after its mat file has been applied) axially
oriented
- slicedef - 2x3 array specifying dimensions for slice images in mm
where rows are x,and y of slice image, and cols are neg max dim,
slice separation and pos max dim
- slices - vector of slice positions in mm in z (of transformed image)
- figure - figure handle for slice display figure
- refreshf - flag - if set or empty, refresh axis info for figure
else assume this is OK
- clf - flag, non zero -> clear figure before display. Redundant
if refreshf == 0
- area struct with fields
position - bottom left, x size y size 1x4 vector of
area in which to display slices
units - one of
inches,centimeters,normalized,points,{pixels}
halign - one of left,{center},right
valign - one of top,{middle},bottom
- xslices - no of slices to display across figure (defaults to an optimum)
- cbar - if empty, missing, no colourbar. If an array of integers, then
indexes img array, and makes colourbar for each cmap for
that img. Cbars specified in order of appearance L->R
- labels - struct can be absent (-> default numerical labels)
empty (SO.labels = []) (no labels) or contain fields
colour - colour for label text
size - font size in units normalized to slice axes
format - if = cell array of strings =
labels for each slice in Z. If is string, specifies
sprintf format string for labelling in distance of the
origin (Xmm=0, Ymm=0) of each slice from plane containing
the AC, in mm, in the space of the transformed image
- callback - callback string for button down on image panels. E.g.
setting SO.callback to 'slice_overlay(''getpos'')' prints to
the matlab window the equivalent position in mm of the
position of a mouse click on one of the image slices
- printstr - string for printing slice overlay figure window, e.g.
'print -dpsc -painters -noui' (the default)
- printfile - name of file to print output to; default 'slices.ps'
FORMAT slice_overlay
Checks, fills SO struct (slice_overlay('checkso')), and
displays slice overlay (slice_overlay('display'))
FORMAT slice_overlay('checkso')
Checks SO structure and sets defaults
FORMAT [cmap warnstr] = slice_overlay('getcmap',cmapname)
Gets colormap named in cmapname string
FORMAT [mx mn] = slice_overlay('volmaxmin', vol)
Returns maximum and minimum finite values from vol struct 'vol'
FORMAT slice_overlay('addspm',SPM,VOL,dispf)
Adds SPM blobs as new img to SO struct, split effect, 'hot' colormap,
Structures SPM and VOL are generated by calls to SPM results
if not passed, they are fetched from the workspace
If dispf is not passed, or nonzero, displays resulting SO figure also
FORMAT slice_overlay('addblobs', imgno, XYZ, vals, mat)
adds SPM blobs to img no 'imgno', as specified in
XYZ - 3xN voxel coordinates of N blob values
vals - N blob intensity values
mat - 4x4 matrix specifying voxels -> mm
FORMAT vol = slice_overlay('blobs2vol', XYZ, vals, mat)
returns (pseudo) vol struct for 3d blob volume specified
in matrices as above
FORMAT slice_overlay('addmatrix', imgno, mat3d, mat)
adds 3d matrix image vol to img imgno. Optionally
mat - 4x4 matrix specifying voxels -> mm
FORMAT vol = slice_overlay('matrix2vol', mat3d, mat)
returns (pseudo) vol struct for 3d matrix
input matrices as above
FORMAT mmpos = slice_overlay('getpos')
returns equivalent position in mm of last click on current axes (gca)
if the axes contain an image slice (empty otherwise)
FORMAT vals = slice_overlay('pointvals', XYZmm, holdlist)
returns IxN matrix with values of each image 1..I, at each
point 1..N specified in 3xN mm coordinate matrix XYZmm
If specified, 'holdlist' contains I values giving hold
values for resampling for each image (see spm_sample_vol)
FORMAT slice_overlay('display')
Displays slice overlay from SO struct
FORMAT slice_overlay('print', filename, printstr)
Prints slice overlay figure, usually to file. If filename is not
passed/empty gets filename from SO.printfile. If printstr is not
passed/empty gets printstr from SO.printstr
V 0.9 8/9/00 Added contour maps (many thanks to Petr Janata for this
idea), expanded colormap reader
This program is copyright, or rather copyleft, under the terms of
the GNU public licence; see licence.man or http://www.gnu.org/copyleft
Still beta - take care. Please report problems to Matthew Brett