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Proceedings Paper

Establishing a method to measure bone structure using spectral CT
Author(s): M. Ramyar; C. Leary; A. Raja; A. P. H. Butler; T. B. F. Woodfield; N. G. Anderson; Tracy E. Kirkbride
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Paper Abstract

Combining bone structure and density measurement in 3D is required to assess site-specific fracture risk. Spectral molecular imaging can measure bone structure in relation to bone density by measuring macro and microstructure of bone in 3D. This study aimed to optimize spectral CT methodology to measure bone structure in excised bone samples. MARS CT with CdTe Medipix3RX detector was used in multiple energy bins to calibrate bone structure measurements. To calibrate thickness measurement, eight different thicknesses of Aluminium (Al) sheets were scanned one in air and the other around a falcon tube and then analysed. To test if trabecular thickness measurements differed depending on scan plane, a bone sample from sheep proximal tibia was scanned in two orthogonal directions. To assess the effect of air on thickness measurement, two parts of the same human femoral head were scanned in two conditions (in the air and in PBS). The results showed that the MARS scanner (with 90μm voxel size) is able to accurately measure the Al (in air) thicknesses over 200μm but it underestimates the thicknesses below 200μm because of partial volume effect in Al-air interface. The Al thickness measured in the highest energy bin is overestimated at Al-falcon tube interface. Bone scanning in two orthogonal directions gives the same trabecular thickness and air in the bone structure reduced measurement accuracy. We have established a bone structure assessment protocol on MARS scanner. The next step is to combine this with bone densitometry to assess bone strength.

Paper Details

Date Published: 9 March 2017
PDF: 9 pages
Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 101323I (9 March 2017); doi: 10.1117/12.2255616
Show Author Affiliations
M. Ramyar, Univ. of Otago, Christchurch (New Zealand)
C. Leary, Oregon Health & Science Univ. (United States)
A. Raja, Univ. of Otago, Christchurch (New Zealand)
A. P. H. Butler, Univ. of Otago, Christchurch (New Zealand)
MARS Bioimaging Ltd. (New Zealand)
CERN (Switzerland) and Univ. of Canterbury (New Zealand)
T. B. F. Woodfield, Univ. of Otago, Christchurch (New Zealand)
N. G. Anderson, Univ. of Otago, Christchurch (New Zealand)
Tracy E. Kirkbride, Ara Institute of Canterbury (New Zealand)

Published in SPIE Proceedings Vol. 10132:
Medical Imaging 2017: Physics of Medical Imaging
Thomas G. Flohr; Joseph Y. Lo; Taly Gilat Schmidt, Editor(s)

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