Quantifying refractive index mismatch effects on cone beam optical CT scanner measurements

9th International Conference on 3D Radiation Dosimetry

Carpentier, E.E.^1 ; Alexander, K.M.^1 ; Schreiner, L.J.^1,2

Department of Physics, Queen's University, Kingston

ON

K7L 3N6, Canada^1

Department of Medical Physics, Cancer Centre of Southeastern Ontario, Kingston General Hospital, Kingston

ON

K7L 5P9, Canada^2

关键词: Attenuation coefficient;    Cone beam;    Converging lens;    Optical attenuation;    Optical CT;    Refractive index mismatch;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/847/1/012007/pdf
DOI  :  10.1088/1742-6596/847/1/012007

来源: IOP

【 摘 要 】

A series of experiments are conducted to evaluate the effects of refractive index (RI) mismatch in readout with a Vista cone beam optical CT scanner. The changing optical attenuation in cuvettes of different colours and RI are quantified using a spectrophotometer, which shows decreasing attenuation as RI increases. A small jar of a colourless solution inside a large jar of another colourless solution with different combinations of fluids of varying RI is imaged in the Vista scanner. Large RI solutions surrounding small RI solutions create a converging lens, while small RI solutions surrounding large RI solutions create a diverging lens. The same dual-jar system is used with solutions of varying RI and colour (attenuation) to assess the effect of RI on attenuation coefficient determination.