Improvement of detection in computed radiography by new single-exposure dual-energy subtraction.
It is reported that the use of the dual-energy subtraction method enhances the abnormal shadow detection capability. However, because the subtracted image is significantly inferior to the original in signal-to-noise ratio (SNR), the x-ray dosage normally used for chest x-rays has not yielded subtracted images with adequate SNRs. Under these circumstances, we focus on the fact that there is a correlation between the noise contents of bone-and soft-tissue-subtracted images although there is no correlation between the signal contents of these images. We propose an algorithm that improves SNRs of subtraction images by reducing the noise only.
Ito
W
W
Miyanodai Technology Development Center, Fuji Photo Film Company, Ltd, Kanagawa, Japan.
Shimura
K
K
Nakajima
N
N
Ishida
M
M
Kato
H
H
D000465:Algorithms; D006801:Humans; D008961:Models, Structural; D015900:Radiography, Dual-Energy Scanned Projection; D013902:Radiography, Thoracic / Q000379:methods*