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| Impact of Time Domain Window-adding for the Ramp Filter on Image Reconstruction |
| QIAO Zhi-wei |
| School of Electronics and Computer Science and Technology, North University of China, Taiyuan, Shanxi 030051, China |
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Abstract The time domain window-adding method for the unit impulse response of the ramp filter is proposed. the unit impulse response of the ramp filter should be symmetrical and its length should be odd number to ensure that it is strict zero-phase. There are many windows to truncate the unit impulse response, for example, rectangle window, triangle window, Hanning window, Hamming windows, Blackman window etc. The simulation experiment demonstrates that the rectangle window is the best and the triangle window is the worst, for the triangle window depresses the first side petal overly. The precision of the CT images reconstructed by the others windows is in-between. The rectangle window should be used when the unit impulse response of the ramp filter is been truncated.
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2014, Vol. 35 
