Gamma cameras are provided. The subject gamma cameras include an analysis region comprising a spatial area configured to receive a sample, a first detector head positioned to receive gamma radiation from the analysis region, the first detector head including a first scatterer and a first absorber parallel to the first scatterer, and a second detector head positioned on the opposite side of the analysis region relative to the first detector head, the second detector head including a second scatterer and a second absorber parallel to the second scatterer. Systems and methods for practicing the invention are also provided.