How can i define a phantom in a typical nuclear medicine acquisition matrix size having a spot?

How can i define a phantom in a typical nuclear medicine acquisition matrix size having a spot?

Answer 1

[Image Analyst]

What do you mean by define? You mean make a virtual phantom? Well you can just create an image

grayImage = zeros(rows, columns);

Then set some (row, column) location to a value

grayImage(row, column) = someValue;

[Akshit]

yes , thanks . so , how can i add a defect(hot spot) to it?

[Image Analyst]

If you want a circle, see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

or else see my attached demo.