Gaussian noise on dicom images

I have added Gaussian noise on a DICOM image using the following commands..

B=dicomread('image.dcm'); 
C=imnoise(B,'guassian'); 
imshow(C); 

But it entirely corrupts the image...when I am doing the same for a .jpg file it does not corrupt the whole image...please help me to solve this problem.... Thank you

Answer 1

[KALYAN ACHARJYA]

Try

imshow(C,'DisplayRange',[]);

[Luka Luko]

thank you for your reply, i have already use it but still the same problem with my watermarked medical image of type double..

Answer 2

[Image Analyst]

Try changing the input parameters for imnoise() so that it adds less noise.

Attach your image if you need more help.

[Luka Luko]

I had already try with a very small value of noise, but still the same problem.. Attached is the image, i'm working with..