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Due to the rapid increase in use of CT imaging and the recently-heightened awareness of radiation-induced cancer, improving the diagnostic quality of low dose CT has become increasingly important. One potential method is to increase the signal-to-noise ratio of low dose images through denoising. Non-local means is a promising approach; however, it has many potentially adjustable parameters and application-specific...
In this paper we show that the signal-to-noise ratio of helical cone-beam reconstructions based on Katsevish's formula can be significantly improved for 16- and 32-row scanners, using the observation that Katsevich's formula heavily relies on the concept of pi-lines. A pi-line is any segment of line that connects two source positions separated by less than one helix turn; pi-lines are such that each...
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