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Experimental study of the moisture distribution inside a pulp sheet using MRI. Part I: Principles of the MRI technique

Bernada, P; Stenström, Stig LU and Mansson, S (1998) In Journal of Pulp and Paper Science 24(12). p.373-379
Abstract
Due to its real advantages in terms of spatial resolution, the MRI technique has been chosen in order to study the internal moisture in 2.5 mm thick industrial pulp samples. A spin-echo sequence with very short echo-time (TE= 2 ms) has been designed to measure moisture content inside highly hygroscopic materials and was able to detect moisture even at very low moisture content (6%). In order to enhance the spin-lattice relaxation process, and thus reduce the total scanning time of an image, the pulp samples were wetted with solutions containing contrasting agents such as copper sulphate. The optimized value of the copper sulphate concentration was finally found to be around 0.5 gL(-1). A calibration curve was utilized to transform the... (More)
Due to its real advantages in terms of spatial resolution, the MRI technique has been chosen in order to study the internal moisture in 2.5 mm thick industrial pulp samples. A spin-echo sequence with very short echo-time (TE= 2 ms) has been designed to measure moisture content inside highly hygroscopic materials and was able to detect moisture even at very low moisture content (6%). In order to enhance the spin-lattice relaxation process, and thus reduce the total scanning time of an image, the pulp samples were wetted with solutions containing contrasting agents such as copper sulphate. The optimized value of the copper sulphate concentration was finally found to be around 0.5 gL(-1). A calibration curve was utilized to transform the signal intensity into moisture content values. A slight curvature probably due to shrinkage effects appears in the calibration curve. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
bibliographies, magnetic resonance, image analysis, moisture content, distribution, pulps, hand sheets, copper compounds
in
Journal of Pulp and Paper Science
volume
24
issue
12
pages
373 - 379
publisher
TAPPI
external identifiers
  • wos:000077877600001
  • scopus:0842275031
ISSN
0826-6220
language
English
LU publication?
yes
id
146baa8f-4eb7-4b80-8838-1c22ad773d7f (old id 3914007)
date added to LUP
2013-07-01 12:18:54
date last changed
2017-08-27 05:12:20
@article{146baa8f-4eb7-4b80-8838-1c22ad773d7f,
  abstract     = {Due to its real advantages in terms of spatial resolution, the MRI technique has been chosen in order to study the internal moisture in 2.5 mm thick industrial pulp samples. A spin-echo sequence with very short echo-time (TE= 2 ms) has been designed to measure moisture content inside highly hygroscopic materials and was able to detect moisture even at very low moisture content (6%). In order to enhance the spin-lattice relaxation process, and thus reduce the total scanning time of an image, the pulp samples were wetted with solutions containing contrasting agents such as copper sulphate. The optimized value of the copper sulphate concentration was finally found to be around 0.5 gL(-1). A calibration curve was utilized to transform the signal intensity into moisture content values. A slight curvature probably due to shrinkage effects appears in the calibration curve.},
  author       = {Bernada, P and Stenström, Stig and Mansson, S},
  issn         = {0826-6220},
  keyword      = {bibliographies,magnetic resonance,image analysis,moisture content,distribution,pulps,hand sheets,copper compounds},
  language     = {eng},
  number       = {12},
  pages        = {373--379},
  publisher    = {TAPPI},
  series       = {Journal of Pulp and Paper Science},
  title        = {Experimental study of the moisture distribution inside a pulp sheet using MRI. Part I: Principles of the MRI technique},
  volume       = {24},
  year         = {1998},
}