why dose the dcm2pnm work not fine?

[norman]

I use the dcm2pnm funtion to convert DICOM image to BMP image file,but I find the BMP image too bad,it like the gray sky.but the DICOM image was showed very in the efilm.
could any one tell me how can i do it?Mybe the dcm2pnm function need some especial parameter?

[Jörg Riesmeier]

You should specify an appropriate VOI window:

Code: Select all

VOI LUT transformation:
    -W    --no-windowing        no VOI windowing (default)
    +Wi   --use-window          [n]umber : integer
                                use the n-th VOI window from image file
    +Wl   --use-voi-lut         [n]umber : integer
                                use the n-th VOI look up table from image file
    +Wm   --min-max-window      compute VOI window using min-max algorithm
    +Wn   --min-max-window-n    compute VOI window using min-max algorithm,
                                ignoring extreme values
    +Wr   --roi-min-max-window  [l]eft [t]op [w]idth [h]eight : integer
                                compute ROI window using min-max algorithm,
                                region of interest is specified by l,t,w,h
    +Wh   --histogram-window    [n]umber : integer
                                compute VOI window using Histogram algorithm,
                                ignoring n percent
    +Ww   --set-window          [c]enter [w]idth : float
                                compute VOI window using center c and width w

If the image does not contain any useful VOI window you could try the min-max window (+Wm).

[norman]

You should specify an appropriate VOI window:

Code: Select all

VOI LUT transformation:
    -W    --no-windowing        no VOI windowing (default)
    +Wi   --use-window          [n]umber : integer
                                use the n-th VOI window from image file
    +Wl   --use-voi-lut         [n]umber : integer
                                use the n-th VOI look up table from image file
    +Wm   --min-max-window      compute VOI window using min-max algorithm
    +Wn   --min-max-window-n    compute VOI window using min-max algorithm,
                                ignoring extreme values
    +Wr   --roi-min-max-window  [l]eft [t]op [w]idth [h]eight : integer
                                compute ROI window using min-max algorithm,
                                region of interest is specified by l,t,w,h
    +Wh   --histogram-window    [n]umber : integer
                                compute VOI window using Histogram algorithm,
                                ignoring n percent
    +Ww   --set-window          [c]enter [w]idth : float
                                compute VOI window using center c and width w

If the image does not contain any useful VOI window you could try the min-max window (+Wm).

it worked very fine after using +Wm parameter,Than your Very much!