Set the XData (and YData if required) properties of your image, either when first creating it as e.g.
image( hAxes, 1:360, 1:200, myImage )
or afterwards as e.g.
hIm = image( hAxes, myImage );
hIm.XData = 1:360;
etc.
will take you to the help index page from which you can go to the first link which gives more details.
Note: hAxes there is your axes handle. If you aren't using one then you should! Don't get into the habit of plotting things without giving an explicit axes!
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