High resolution cortical bone thickness measurement from clinical CT data.

Abstract:

:The distribution of cortical bone in the proximal femur is believed to be a critical component in determining fracture resistance. Current CT technology is limited in its ability to measure cortical thickness, especially in the sub-millimetre range which lies within the point spread function of today's clinical scanners. In this paper, we present a novel technique that is capable of producing unbiased thickness estimates down to 0.3mm. The technique relies on a mathematical model of the anatomy and the imaging system, which is fitted to the data at a large number of sites around the proximal femur, producing around 17,000 independent thickness estimates per specimen. In a series of experiments on 16 cadaveric femurs, estimation errors were measured as -0.01+/-0.58mm (mean+/-1std.dev.) for cortical thicknesses in the range 0.3-4mm. This compares with 0.25+/-0.69mm for simple thresholding and 0.90+/-0.92mm for a variant of the 50% relative threshold method. In the clinically relevant sub-millimetre range, thresholding increasingly fails to detect the cortex at all, whereas the new technique continues to perform well. The many cortical thickness estimates can be displayed as a colour map painted onto the femoral surface. Computation of the surfaces and colour maps is largely automatic, requiring around 15min on a modest laptop computer.

journal_name

Med Image Anal

journal_title

Medical image analysis

authors

Treece GM,Gee AH,Mayhew PM,Poole KE

doi

10.1016/j.media.2010.01.003

subject

Has Abstract

pub_date

2010-06-01 00:00:00

pages

276-90

issue

3

eissn

1361-8415

issn

1361-8423

pii

S1361-8415(10)00012-5

journal_volume

14

pub_type

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