Which of the following enhances image quality in CT imaging?

Using a higher matrix size enhances image quality in CT imaging by increasing the resolution of the images obtained. The matrix size refers to the number of pixels in each dimension of the image; a larger matrix means more pixels are used to represent the data, leading to finer detail and improved clarity in the final images. This granularity allows for the visualization of smaller structures and enhances the overall diagnostic utility of the images.

In contrast, increasing scatter radiation, decreasing the kilovoltage peak (kVp), and decreased photon fluence would not improve image quality. Scatter radiation can introduce noise and reduce the clarity of the image, while lowering kVp typically decreases image contrast and may not provide adequate penetration, resulting in suboptimal images. Decreased photon fluence refers to a reduction in the number of x-ray photons reaching the detector, leading to a darker image with poorer signal-to-noise ratio. Therefore, focusing on a higher matrix size is a well-established method for improving image quality in CT imaging.