30 June 1993 Scatter removal using modified air gap method: spectral composition technique
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A new scatter rejection technique using the modified air gap method is presented. Two x-ray cassettes are used per exposure. One cassette (front cassette) was placed immediately behind the object. The other (back cassette) was positioned 60 cm behind the object. The front radiograph has good spatial resolution but includes a relatively large amount of scatter. The back radiograph has poor high frequency resolution but little scatter due to the air gap. The spectral composition technique extracts high frequency information from the front radiograph and combines it with the low frequency information of the back radiograph to produce an improved composite synthesized image. No artifacts due to the spectral composition technique were observed. In the lung and heart regions, the modified air gap method resulted in comparable or superior scatter rejection performance as compared to the conventional grid technique.
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Hisashi Yonekawa, Hisashi Yonekawa, Keh-Shih Chuang, Keh-Shih Chuang, Ricky K. Taira, Ricky K. Taira, H. K. Huang, H. K. Huang, } "Scatter removal using modified air gap method: spectral composition technique", Proc. SPIE 1897, Medical Imaging 1993: Image Capture, Formatting, and Display, (30 June 1993); doi: 10.1117/12.146965; https://doi.org/10.1117/12.146965

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