- 作者: 盧樹台; 周晟; 吳正文
- 作者服務機構: 中正理工學院電子工程科; 中正理工學院應用物理系
- 中文摘要: 傅氏光柵(Fourier Aperture)是利用可調式光柵的原理,有效的獲得放射性成像物體的空間頻率(spatial frequency)資料。量子雜訊(quantum noise)也不可避免的直接散佈在頻率空間中。本文主要在討論量子雜訊對傅氏光柵成像系統的影響,並比較它和FZP成像系統對量子雜訊的影響。由計算信號雜訊比(SNR)的結果中顯示它們的成像品質相當接近。
- 英文摘要: Fourier Aperture (FA) behaves as an adjustable grating, records unknown sources in the Fourierdomain where the quantum noise is introduced in this region originally. The noise properties of FA imagingsystem with DFT and SFBP reconstructed algorithms have been derived. The stationary Fresnel Zone Plate(FZP) is compared with FA on noise properties. These calculations on SNR show that the two imagingsystems are comparable within a factor of 4 if the point source is considered.
- 中文關鍵字: noise; coded aperture imagimg; Fourier
- 英文關鍵字: --