1. A CT system comprising: a rotatable gantry having an opening to receive an object to be scanned; an x-ray source configured to project an x-ray beam toward the object; a detector array having a width in a slice-direction and configured to detect x-rays passing through the object; a first bowtie filter positioned between the x-ray source and the opening, the first bowtie filter comprising: a first x-ray filtration region positioned to attenuate x-rays that pass through an isochannel of the detector array; a second x-ray filtration region positioned to attenuate x-rays that pass through channels of the detector array that are offcenter in a channel direction from the isochannel; and an x-ray attenuation material positionable to attenuate the x-rays that pass through the channels of the detector array that are offcenter in the channel direction from the isochannel; a data acquisition system (DAS) connected to the detector array and configured to receive outputs from the detector array; and a computer programmed to: acquire projections of imaging data of the object from the DAS; and generate an image of the object using the imaging data.