Image generation apparatus

An image generation method for generating an image of an object, the image generation method comprising:

• providing measured projection values of the object by a measured projection values providing unit,
• reconstructing the image based on the provided measured projection values such that costs defined by a cost function are reduced by a reconstruction unit, wherein the cost function depends on differences between calculated projection values, which have been determined by simulating a forward projection through the image, and the provided measured projection values, and
• wherein the cost function depends a first difference of the differences weighted by a first weight and a second difference of the differences weighted by a second weight, and the second weight is smaller than the first weight.

A non-transitory computer readable medium storing instructions that when executed by a computer cause the computer to perform a method comprising:

• providing measured projection values of the object by a measured projection values providing unit,
• reconstructing the image based on the provided measured projection values such that costs defined by a cost function are reduced by a reconstruction unit, wherein the cost function depends on differences between calculated projection values, which have been determined by simulating a forward projection through the image, and the provided measured projection values, and
• wherein the cost function depends a first difference of the differences weighted by a first weight and a second difference of the differences weighted by a second weight, and the second weight is smaller than the first weight.