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BMC Medical Imaging
Published in: BMC Medical Imaging 1/2020

Open Access 01-12-2020 | Research article

Pre-contrast T1 and cartilage thickness as confounding factors in dGEMRIC when evaluating human cartilage adaptation to physical activity

Authors: Carl Johan Tiderius, Zana K. Hawezi, Lars E. Olsson, Leif E. Dahlberg

Published in: BMC Medical Imaging | Issue 1/2020

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Abstract

Background

The dGEMRIC (delayed Gadolinium-Enhanced MRI of Cartilage) technique has been used in numerous studies for quantitative in vivo evaluation of the relative glycosaminoglycan (GAG) content in cartilage. The purpose of this study was to determine the influence of pre-contrast T1 and cartilage thickness when assessing knee joint cartilage quality with dGEMRIC.

Methods

Cartilage thickness and T1 relaxation time were measured in the central part of the femoral condyles before and two hours after intravenous Gd-DTPA2− administration in 17 healthy volunteers from a previous study divided into two groups: 9 sedentary volunteers and 8 exercising elite runners. Results were analyzed in superficial and a deep weight-bearing, as well as in non-weight-bearing regions of interest.

Results

In the medial compartment, the cartilage was thicker in the exercising group, in weight-bearing and non-weight-bearing segments. In most of the segments, the T1 pre-contrast value was longer in the exercising group compared to the sedentary group. Both groups had a longer pre-contrast T1 in the superficial cartilage than in the deep cartilage. In the superficial cartilage, the gadolinium concentration was independent of cartilage thickness. In contrast, there was a linear correlation between the gadolinium concentration and cartilage thickness in the deep cartilage region.

Conclusion

Cartilage pre-contrast T1 and thickness are sources of error in dGEMRIC that should be considered when analysing bulk values. Our results indicate that differences in cartilage structure due to exercise and weight-bearing may be less pronounced than previously demonstrated.
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Metadata
Title
Pre-contrast T1 and cartilage thickness as confounding factors in dGEMRIC when evaluating human cartilage adaptation to physical activity
Authors
Carl Johan Tiderius
Zana K. Hawezi
Lars E. Olsson
Leif E. Dahlberg
Publication date
01-12-2020
Publisher
BioMed Central
Published in
BMC Medical Imaging / Issue 1/2020
Electronic ISSN: 1471-2342
DOI
https://doi.org/10.1186/s12880-019-0399-0

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