Micro-imaging of articular cartilage: T2, proton density, and the magic angle effect

1998 ◽  
Vol 5 (11) ◽  
pp. 790-798 ◽  
Author(s):  
Douglas W. Goodwin ◽  
Youssef Zaim Wadghiri ◽  
Jeffrey F. Dunn
Keyword(s):  
Articular Cartilage ◽  
Proton Density ◽  
Magic Angle ◽  
Angle Effect ◽  
Magic Angle Effect

scholarly journals Magic angle effect plays a major role in both T1rho and T2 relaxation in articular cartilage

2017 ◽  
Vol 25 (12) ◽  
pp. 2022-2030 ◽  
Author(s):  
H. Shao ◽  
C. Pauli ◽  
S. Li ◽  
Y. Ma ◽  
A.S. Tadros ◽  
...  
Keyword(s):  
Articular Cartilage ◽  
Magic Angle ◽  
T2 Relaxation ◽  
Angle Effect ◽  
Magic Angle Effect

Use of Fat-Suppressed T2-Weighted MRI Images to Reduce the Magic Angle Effect in Peroneal Tendons

2018 ◽  
Vol 12 (6) ◽  
pp. 513-517 ◽  
Author(s):  
Edmund Ieong ◽  
Michael Rafferty ◽  
Monica Khanna ◽  
Miny Walker ◽  
Peter Rosenfeld
Keyword(s):  
Case Series ◽  
Proton Density ◽  
Magic Angle ◽  
Peroneal Tendon ◽  
Peroneal Tendons ◽  
Mri Scans ◽  
Angle Effect ◽  
Magnetic Resonance Imaging Mri ◽  
Weighted Sequences ◽  
Magic Angle Effect

Introduction. Peroneal tendon disorders pose a diagnostic conundrum to the clinician. Magnetic resonance imaging (MRI) is widely used to assess tendon pathology. A recognized artifact of MRI, the magic angle effect (MAE), can lead to spurious results and inappropriate management. The aim of this study is to assess whether T2 fat-suppressed sequences (T2FSs) reduce the frequency of MAE compared with proton density fat-suppressed (PDFS) images. Methods. MRI scans of 18 patients were prospectively assessed for MAE. The peroneal tendons were assessed at 5 defined levels on PDFS and T2FS images. The frequency of MAE in the peroneal tendons were compared between the 2 scan sequences. Results. In the peroneus brevis tendon, 17/72 levels, on PDFS scans, showed MAE compared with 2/72 levels on the T2FS scans, demonstrating a reduction in the MAE by 85% (P = .0003). In the peroneus longus tendon 14/72 levels, on PDFS scans, demonstrated MAE compared with 4/72 on T2FSs, demonstrating a reduction of 71% (P = .02). Conclusion. The inclusion of T2-weighted sequences is useful in MRI scanning for peroneal tendons to mitigate the MAE artifact, avoid potential misdiagnosis, and guide subsequent management of peroneal tendon disorders. Levels of Evidence: Level IV: Case series

Orientation-dependent changes in MR signal intensity of articular cartilage: a manifestation of the "magic angle" effect

1998 ◽  
Vol 27 (6) ◽  
pp. 306-310 ◽  
Author(s):  
F. K. Wacker ◽  
Xenia Bolze ◽  
Dieter Felsenberg ◽  
Karl-Jürgen Wolf
Keyword(s):  
Articular Cartilage ◽  
Signal Intensity ◽  
Magic Angle ◽  
Angle Effect ◽  
Magic Angle Effect

scholarly journals The magic angle effect: A source of artifact, determinant of image contrast, and technique for imaging

2007 ◽  
Vol 25 (2) ◽  
pp. 290-300 ◽  
Author(s):  
Mark Bydder ◽  
Andres Rahal ◽  
Gary D. Fullerton ◽  
Graeme M. Bydder
Keyword(s):  
Image Contrast ◽  
Magic Angle ◽  
Angle Effect ◽  
Magic Angle Effect

Satellite transition rotational resonance of homonuclear quadrupolar spins: magic-angle effect on spin-echo decay and inversion recovery

2003 ◽  
Vol 376 (1-2) ◽  
pp. 75-82 ◽  
Author(s):  
Hyung-Tae Kwak ◽  
Parthasarathy Srinivasan ◽  
John Quine ◽  
Dominique Massiot ◽  
Zhehong Gan
Keyword(s):  
Spin Echo ◽  
Inversion Recovery ◽  
Magic Angle ◽  
Rotational Resonance ◽  
Angle Effect ◽  
Magic Angle Effect ◽  
And Inversion ◽  
Satellite Transition
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