An imaging system is provided that includes a gantry, a plurality of image detectors, an x-ray source, an adjustable source collimator, and at least one processor. The image detectors are radially spaced around a circumference of the bore such that gaps exist between adjacent image detectors. The x-ray source transmits x-rays across the bore towards at least two of the image detectors. The adjustable source collimator is interposed between the x-ray source and a center of the bore, and is configured to block a portion of the x-rays produced by the x-ray source The at least one processor is configured to control the adjustable source collimator to dynamically adjust a range of x-rays that are blocked by the adjustable source collimator along the fan angle during transmission of x-rays from the x-ray source and acquisition of computed tomography (CT) information.