Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Oral and maxillofacial radiologyApplication of magnetic resonance T2 mapping in the temporomandibular joints
Section snippets
Material and Methods
Ethical approval for this prospective study was obtained from the ethical board of the West China College of Stomatology, Sichuan University, Chengdu, China. We declare that we have read the Helsinki Declaration and followed the guidelines in this investigation. Participation in the study was voluntary, and signed informed consent was obtained for all participants.
Results
Mean T2 values for the whole disk were 40.21 ± 2.95, and for the superior, inner, and inferior layers and anterior, middle, and posterior bands, the values were 39.42 ± 3.73, 37.28 ± 3.54, and 40.11 ± 3.29 and 36.96 ± 3.43, 41.04 ± 5.51, and 36.01 ± 3.72, respectively (shown in Table II). Significant differences were demonstrated among the 3 layers and among the 3 bands (P < .05) (shown in Table III). Post hoc tests found significantly higher T2 values in the superior and inferior layers
Discussion
Preliminary determinations of T2 values for the bands and layers of normal TMJ disks were calculated. The T2 characters of both top-down spatial variation and anterior-posterior spatial variation were documented.
The spatial variation of T2 values in healthy articular cartilage12, 13, 14 has been demonstrated to be related to different orientations of collagen fibers in different histologic layers of the cartilage or the magic-angle effect.5
In articular cartilage with different histologic
References (20)
- et al.
Quantitative in situ correlation between microscopic MRI and polarized light microscopy studies of articular cartilage
Osteoarthritis Cartilage
(2001) - et al.
Magnetic resonance imaging of the temporomandibular joint
Radiologia
(2008) - et al.
Research diagnostic criteria for temporomandibular disorders (RDC/TMD): development of image analysis criteria and examiner reliability for image analysis
Oral Surg Oral Med Oral Pathol Oral Radiol Endod
(2009) - et al.
Magic angle effect in magnetic resonance imaging of the Achilles tendon and enthesis
Magn Reson Imaging
(2009) - et al.
Cartilage MRI T2 relaxation time mapping: overview and applications
Semin Musculoskelet Radiol
(2004) Magic-angle effect in magnetic resonance imaging of articular cartilage: a review
Invest Radiol
(2000)- et al.
Evaluation of water content by spatially resolved transverse relaxation times of human articular cartilage
Magn Reson Imaging
(2000) - et al.
Quantitative MR microscopy of enzymatically degraded articular cartilage
Magn Reson Med
(2000) - et al.
Degenerative disorders of the temporomandibular joint: etiology, diagnosis, and treatment
J Dent Res
(2008) - et al.
Evidence-based evaluation of three imaging methods for the temporomandibular disc
Dentomaxillofac Radiol
(1996)
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The present study was supported by the Science and Technology Department of Sichuan Province, Project No. 2010FZ0087.