Title
Possibilities of energy-resolved X-ray radiography for the investigation of paintings Possibilities of energy-resolved X-ray radiography for the investigation of paintings
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Berlin ,
Subject
Chemistry
Source (journal)
Analytical and bioanalytical chemistry. - Berlin, 2002, currens
Volume/pages
402(2012) :4 , p. 1471-1480
ISSN
1618-2642
ISI
000299842000008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
X-ray radiographic images of paintings often show little or no contrast. In order to increase the contrast in radiographic images we measured the X-ray spectrum of a low power X-ray tube, after passing through the painting, with a high energy-resolution SDD detector. To obtain images, the detector is collimated with a 400 mu m diameter pinhole and the painting was moved through the beam in the x and y-direction using a dwell time of a few seconds per pixel. The data obtained consists of a data cube of, typically, 200 x 200 pixels and a 512-channel X-ray spectrum for each pixel, spanning the energy range from 0 to 40 keV. Having the absorbance spectrum available for each pixel, we are able, a posteriori, to produce images by edge subtraction for any given element. In this way high contrast, element-specific, images can be obtained. Because of the high energy-resolution a much simpler edge subtraction algorithm can be applied. We also used principal-component imaging to obtain, in a more automated way, images with high contrast. Some of these images can easily be attributed to specific elements. It turns out that preprocessing of the spectral data is crucial for the success of the multivariate image processing.
E-info
https://repository.uantwerpen.be/docman/iruaauth/750045/8b11228.pdf
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