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Comparison of MR images for age determination; T1 weighted images (T1WI) versus T2* weighted images (T2*WI)

Author(s):
Yoshikazu ShimadaYoshikazu Shimada1,*, Daisuke ShimaoDaisuke Shimao2, Jiro KobayashiJiro Kobayashi1, Chikako NakahoriChikako Nakahori1, Mariko ShimadaMariko Shimada3, Hiroo FujimotoHiroo Fujimoto3, Tatsuya MisawaTatsuya Misawa1, Haruyasu KatoHaruyasu Kato4, Michiko DohiMichiko Dohi5
1JFA Medical Center, Fukushima, Japan
2Department of Radiological Sciences, Ibaraki Prefectural University of Health Sciences, Ibaraki, Japan
3JFA Academy FUKUSHIMA, Fukushima, Japan
4Department of Sport and Wellness, Rikkyo University, Saitama, Japan
5Department of Sports Medicine, Japan Institute of Sports Sciences, Tokyo, Japan


Asian Journal of Sports Medicine:Vol. 3, issue 1; 47-52
Published online:Feb 29, 2012
Article type:Research Article
Received:May 19, 2011
Accepted:Dec 15, 2011
How to Cite:Yoshikazu ShimadaDaisuke ShimaoJiro KobayashiChikako NakahoriMariko ShimadaHiroo FujimotoTatsuya MisawaHaruyasu KatoMichiko Dohiet al.Comparison of MR images for age determination; T1 weighted images (T1WI) versus T2* weighted images (T2*WI).Asian J Sports Med.3(1):34727.https://doi.org/10.5812/asjsm.34727.

Abstract

Purpose:

T1WI (T1 weighted image) was acquired in order to grade bone fusion following the studies by FIFA (Federation Internationale de Football Associations). Research using images other than T1WI has not been reported. The aim of this study is to evaluate the grade of epiphyseal fusion by T2* weighted images (T2*WI) and to investigate new findings on T2*WI as compared with T1WI.

Methods:

A total of 87 subjects, all junior football players between the ages of 12 and 17 years old, were examined. T1 and T2* WI were obtained using a 1.2T Open type MR system. The T1WI and T2*WI were rated twice randomly by four radiologists using the FIFA grading system.

Results:

The intra-rater reliability for grading was higher in T1WI (The Intraclass Correlation Coefficient (ICC)=0.9490.985) than in T2*WI (ICC=0.9170.943). The inter-rater reliability for grading was also higher in T1WI (ICC=0.923) than in T2*WI (ICC=0.867).

Conclusions:

This research showed that T1WI is a better sequence than T2*WI to evaluate bone fusion following FIFA protocol. It was speculated that the reason for this is that T1WI has higher tissue contrast resolution and enables clearer images of the epiphyseal fusion than T2*WI and the grading system by T1WI was not suitable for T2*WI.

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