is filled with 34 low z 34 gases such as helium or is simply evacuated of any gas if practical if it is required that the thickness of the object traversed by x rays is minimized to improve detection of small features and minimize scattering as is the current practice in mammography an optional light weight support can be used another role of the support is to define the projective geometry of the exposure this support can be made of materials which present little interference to or scattering of x rays such as a structure of acrylic foam covered with two thin skins made of carbon fibers many other structures having similar characteristics can be used as support fig3 illustrates the zoom magnification effect wherein the point x ray source 3 passes through the object 1 in two locations a and b the object located in position b is essentially unmagnified while the object located at position a is substantially magnified when it falls on the detector 6 fig4 with reference to fig3 above shows one experimental example of another variant of the projective method but utilizing the same principle of the resolution enhancement by projective geometry with the source detector distance kept constant and the object being.