DICOM @ OFFIS

hello, i have found out the answer as well, in fact the large surface of black area made a very big difference in compression ratio. mammo image with bigger breast area give me a lower compression ratio, and vice versa. thanks if you all are trying hard to look out the answer for me. :) cheers, sam 8)

hello, i have found out what the problem is. i didn't try this dcmodify version cos in fact using +ey +do are correct, because i tried to measure the max value of 4 images. the first 2 images were an original and a compressed image with both 12Bit-stored, the results are about 2158 and 2144, where b...

hello,

sorry to ask you this, what is dcmodify, and where to get dcmodify, i didn't find this on my downloaded DCMTK version.

cheers,
sam

hello,

yes, i did try using +Ww to set my own VOI window, i got the result of 4098/2048 (center/width) for all images, although i have given a different values of center/width that i wanted to have. Thanks

cheers,
sam

hello, first of all, i would like to thank you very much for answering all the questions. yes, you are right, using +df may let me remain my Bit-stored in 12, but in this case, it changes my Window center and width as i mentioned before Window Center 1555\2048 (same as the original) Window Width 944...

hello, ya, but i compressed few mammo-images using +do, and it ends up giving me a Bit-stored with 11 that i am not able to open in on the workstation at all. i don't know where the problem is. is it because the 11 is not a common used Bit, so it is not possible to open on the workstation? regards, ...

Hi, i have checked on the dcm2pnm with options -im and -o and after that +M and -M, there are no change on the "bits per sample", this is the result columns x rows : 3328 x 4084 bits per sample : 12 color model : monochrome 2 pixel aspect ratio: 1:00 number of frames : 1 VOI windows in fil...

Hello, i have another question regarding to JPEG2000 compression. i have compressed mammography images (26MB), where the images have a large area of black surface. The problem is, all the images that i have compressed couldn't be lees than compression ratio 50, it stops compression before 50. Or to ...

Hello,

i don't know, but i will try the dcm2pnm, option -im and -0 and -M and +M. Thanks.

Regards,
Samantha

hallo, i have compressed few 12 Bitstored radiography images with lossy compression, i want to remain the Bitstored as 12, so i began with the parameters: -ey +df 12 -r 0.02 the results i got from the 30 to 40 images from 100 endded up with: Bitstored: 12 Window Center: 3110.76\4097.00049 Window Wid...