TY - GEN
T1 - Pixel averaging versus digitization using larger apertures
T2 - Medical Imaging VI: Instrumentation
AU - Shaw, Chris C.
AU - Herron, John M.
AU - Gur, David
N1 - Copyright:
Copyright 2004 Elsevier B.V., All rights reserved.
PY - 1992
Y1 - 1992
N2 - 2K (2048 × 2500) or 1K (1024 × 1250) digitized chest film images can be generated by either direct digitization or converting a 4K (4096 × 5000) digitized film image by pixel averaging. In this paper, these two methods are compared for their implication on the resolution properties of the resulting images. A film image of the lead bar resolution pattern was used as the source of all digital images. Signal profiles of the bar pattern were studied to compare the pixel averaging and direct digitization methods. Based on this comparison, it was found that pixel averaging, when used with proper filtering, can be used to simulate direct digitization using larger (210/420) apertures and result in similar square-wave response. Pixel averaging, however, can result in better square-wave response when 2 to 1 or 4 to 1 straight averaging is used or a sharper kernel is used in pre-filtering.
AB - 2K (2048 × 2500) or 1K (1024 × 1250) digitized chest film images can be generated by either direct digitization or converting a 4K (4096 × 5000) digitized film image by pixel averaging. In this paper, these two methods are compared for their implication on the resolution properties of the resulting images. A film image of the lead bar resolution pattern was used as the source of all digital images. Signal profiles of the bar pattern were studied to compare the pixel averaging and direct digitization methods. Based on this comparison, it was found that pixel averaging, when used with proper filtering, can be used to simulate direct digitization using larger (210/420) apertures and result in similar square-wave response. Pixel averaging, however, can result in better square-wave response when 2 to 1 or 4 to 1 straight averaging is used or a sharper kernel is used in pre-filtering.
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M3 - Conference contribution
AN - SCOPUS:0026453872
SN - 0819408034
T3 - Proceedings of SPIE - The International Society for Optical Engineering
SP - 128
EP - 133
BT - Proceedings of SPIE - The International Society for Optical Engineering
PB - Publ by Int Soc for Optical Engineering
Y2 - 23 February 1992 through 24 February 1992
ER -