1. A method for producing an image with a photoacoustic imaging system, comprising: scanning an object with a plurality of light beams produced by a source; detecting a plurality of acoustic signals produced by the light beams with a detector; and generating, with a processing unit, a reconstructed image from the plurality of acoustic signals by filtered backprojection (FBP), where the FBP utilizes a weighted ramp filter applied in Fourier space, where the weighted ramp filter varies over the Fourier space.