segmentation size of an image

I would like to do an image segmentation in ultrasound images. I need to segment my images into six equal parts. How can i calculate the segmentation size?

this is my image, i need to segment this to six equal parts and also calculate segmentation size. anybody please help me out this poblem.

Answer 1

[Image Analyst]

Try this:

[rows, columns, numberOfColorChannels] = size(ultrasoundImage);
segRows = rows/6;
segColumns = columns/6;