TY - GEN
T1 - Background estimation methods for quantitative x-ray fluorescence analysis of gold nanoparticles in biomedical applications
AU - Ren, Liqiang
AU - Wu, Di
AU - Li, Yuhua
AU - Chen, Wei R.
AU - Liu, Hong
PY - 2014
Y1 - 2014
N2 - Accurate background estimation to isolate the fluorescence signals is an important issue for quantitative X-ray fluorescence (XRF) analysis of gold nanoparticles (GNPs). Though a good estimation can be obtained experimentally through acquiring the background spectrum of water solution, it inevitably leads to unnecessary second exposure in reality. Thus, several numerical methods such as trapezoidal shape estimation, interpolation by polynomial fitting and SNIP (Statistics sensitive Nonlinear Iterative Peak-Clipping) algorithm are proposed to achieve this goal. This paper aims to evaluate the estimation results calculated by these numerical methods through comparing with that acquired using the experimental way, in term of mean squared error (MSE). Four GNP/water solutions with various concentrations from 0.0% to 1.0% by weight are prepared. Then, ten spectra are acquired for each solution for further analysis, under the identical condition of using pencil beam x-ray and single spectrometer. Finally, the experimental and numerical methods are performed on these spectra within the optimally determined energy window and their statistical characteristics are analyzed and compared. These numerical background estimation methods as well as the evaluation methods can be easily extended to analyze the fluorescence signals of other nanoparticle biomarkers such as gadolinium, platinum and Barium in multiple biomedical applications.
AB - Accurate background estimation to isolate the fluorescence signals is an important issue for quantitative X-ray fluorescence (XRF) analysis of gold nanoparticles (GNPs). Though a good estimation can be obtained experimentally through acquiring the background spectrum of water solution, it inevitably leads to unnecessary second exposure in reality. Thus, several numerical methods such as trapezoidal shape estimation, interpolation by polynomial fitting and SNIP (Statistics sensitive Nonlinear Iterative Peak-Clipping) algorithm are proposed to achieve this goal. This paper aims to evaluate the estimation results calculated by these numerical methods through comparing with that acquired using the experimental way, in term of mean squared error (MSE). Four GNP/water solutions with various concentrations from 0.0% to 1.0% by weight are prepared. Then, ten spectra are acquired for each solution for further analysis, under the identical condition of using pencil beam x-ray and single spectrometer. Finally, the experimental and numerical methods are performed on these spectra within the optimally determined energy window and their statistical characteristics are analyzed and compared. These numerical background estimation methods as well as the evaluation methods can be easily extended to analyze the fluorescence signals of other nanoparticle biomarkers such as gadolinium, platinum and Barium in multiple biomedical applications.
KW - Background estimation methods
KW - Gold nanoparticle (GNP)
KW - Statistical characteristics
KW - X-ray fluorescence (XRF)
UR - http://www.scopus.com/inward/record.url?scp=84901760656&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84901760656&partnerID=8YFLogxK
U2 - 10.1117/12.2040401
DO - 10.1117/12.2040401
M3 - Conference contribution
AN - SCOPUS:84901760656
SN - 9780819498571
T3 - Progress in Biomedical Optics and Imaging - Proceedings of SPIE
BT - Biophotonics and Immune Responses IX
PB - SPIE
T2 - Biophotonics and Immune Responses IX
Y2 - 3 February 2014 through 3 February 2014
ER -