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Low-dose computed tomography (CT) reconstruction is a significant concern in CT imaging field. Currently, besides CT manufacturers adapted hardware techniques and optimized scan protocols to reduce the X-ray dose, algorithm-based low-dose CT reconstruction methods have been exploited extensively. However, for achieving high-quality algorithm-based low-dose CT reconstruction, there exist several challenges...
Helical computed tomography (HCT) offers several advantages on conventional step-and-shoot CT for imaging a relatively large object, especially in dynamic studies. However, it may increase the X-ray exposure significantly. This work aims to reduce the radiation by noise reduction on low-dose (or mA) sinogram of HCT. The noise reduction method is based on three observations on HCT: (1) the axial sampling...
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