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Spectral considerations for absorption‐edge fluoroscopy
Author(s) -
Kelcz F.,
Mistretta C. A.,
Riederer S. J.
Publication year - 1977
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594298
Subject(s) - fluoroscopy , logarithm , filter (signal processing) , absorption (acoustics) , signal (programming language) , optics , image processing , enhanced data rates for gsm evolution , imaging phantom , absorption edge , signal processing , materials science , physics , computer science , mathematics , image (mathematics) , artificial intelligence , computer vision , mathematical analysis , optoelectronics , telecommunications , band gap , nuclear physics , programming language , radar
In our previous reports on absorption‐edge fluoroscopy, it was not possible to relate fully the subtleties involved in the selection of spectral parameters. This paper is intended as an overview of this important aspect of the technique. It is shown that, by using the 1‐kVp, 2‐filter technique, it is possible to image certain elements (e.g., iodine and xenon) in the presence of tissue variations of ±2 cm about the thickness at which perfect tissue cancellation takes place. Use of logarithmic signal processing extends this range, but bone thickness variations may not be accommodated because only two x‐ray energies are involved in the imaging process. Use of a 3‐kVp, 3‐filter technique with logarithmic signal processing is shown to solve this general problem. Computer simulations show that 1‐mg/cm 2 iodine may be imaged in the presence of 10 cm or more tissue variations and 2000‐mg/cm 2 bone variations.