how to get x,y,z coordinates of 3d dicom image.I have 3d dicom image from which i can get x and y coordinates but z coordinate i cant get it provides me slice no.how to get that z coordinate

how to get x,y,z coordinates of a point on 3d dicom image.I have 3d dicom image from which i can get x and y coordinates but z coordinate i cant get. it provides me slice no.how to get that z coordinate

Answer 1

[Image Analyst]

Multiply the slice number, which you say you know, by the slice separation, which should be in the dicom header.

Answer 2

[drummer]

info = dicominfo('yourImage.dcm');
slice_number = info.InstanceNumber; % Gives you the slice number
slice_thickness = info.SliceThickness; % Gives you the slice thickness

z = slice_number*slice_thickness; % number of steps you made times your voxel metric gives you the z coordinate.

It's pretty much what Image Analyst said. But you should take care on your reference.

Some cases, slice 1 is the last and slice n is the first. Check it before handling as aforementioned.

If n is the first:

z = last_slice_number*slice_thickness - slice_number*slice_thickness.

Sometimes it happens with multimodalities images.

Cheers