Optimizing MR signal contrast of the temporomandibular joint disk
Journal of Magnetic Resonance Imaging, cilt.34, sa.6, ss.1458-1464, 2011 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 34 Sayı: 6
- Basım Tarihi: 2011
- Doi Numarası: 10.1002/jmri.22810
- Dergi Adı: Journal of Magnetic Resonance Imaging
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.1458-1464
- Anahtar Kelimeler: TMJ, UTE, contrast optimization
- Sağlık Bilimleri Üniversitesi Adresli: Hayır
Özet
Purpose: To use a tissue specific algorithm to numerically optimize UTE sequence parameters to maximize contrast within temporomandibular joint (TMJ) donor tissue. Materials and Methods: A TMJ specimen tissue block was sectioned in a true sagittal plane and imaged at 3 Tesla (T) using UTE pulse sequences with dual echo subtraction. The MR tissue properties (PD, T2, T 2*, and T1) were measured and subsequently used to calculate the optimum sequences parameters (repetition time [TR], echo time [TE], and θ). Results: It was found that the main contrast available in the TMJ could be obtained from T2 (or T2*) contrast. With the first echo time fixed at 8 μs and using TR = 200 ms, the optimum parameters were found to be: θ ≈ 60°, and TE2 ≈ 15 ms, when the second echo is acquired using a gradient echo and θ ≈ 120°, and TE2 ≈ 15 ms, when the second echo is acquired using a spin echo. Conclusion: Our results show that MR signal contrast can be optimized between tissues in a systematic manner. The MR contrast within the TMJ was successfully optimized with facile delineation between disc and soft tissues. Copyright © 2011 Wiley Periodicals, Inc.