Qingshan Chen, MS, Sabine Bensamoun, PhD, Jeffrey R

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Identification and Quantification of Myofascial Taut Bands With Magnetic Resonance Elastography Qingshan Chen, MS, Sabine Bensamoun, PhD, Jeffrey R. Basford, MD, PhD, Jeffrey M. Thompson, MD, Kai-Nan An, PhD Archives of Physical Medicine and Rehabilitation Volume 88, Issue 12, Pages 1658-1661 (December 2007) DOI: 10.1016/j.apmr.2007.07.020 Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 1 Experimental setup of MRE on subjects. (I) Pressure chamber connected to a remote loudspeaker. (II) Acrylic bar vibrator. (III) Positioning jig. (IV) Radiologic marker. Archives of Physical Medicine and Rehabilitation 2007 88, 1658-1661DOI: (10.1016/j.apmr.2007.07.020) Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions

Fig 2 Wave propagation patterns. (A) MRE phase image of a homogeneous bovine gel phantom. The vibratory source located at the left border produces a planar waveform. (B) MRE phase image of the bovine gel taut band phantom. Note the chevron-like pattern of the waves as they travel away from the source located at the left border. (C, D) Finite element simulation of the homogeneous and taut band phantom models. Note the reoccurrence of the chevron-shaped waveform in the taut band simulation. (E) MRE phase image of upper trapezius of the control subject superimposed to an MR image of the same region. Note the uniform, planar nature of the waves produced by the vibratory source located on the spine of the scapula—(I) spine of scapula; (II) planar wave fronts in upper trapezius; and (III) cervical spine. (F) MRE phase image of upper trapezius of the patient with myofascial pain superimposed to an MR image of the same region. The line appearing in the figure’s center indicates the physician’s localization of the taut band. Although more difficult to distinguish than in the phantoms, the V-shaped wave fronts are again apparent. λt indicates the wavelength in the chevron-shaped wave fronts region, and λs indicates the wavelength in the surrounding muscle—(I) spine of scapula; (II) chevron-shaped wave fronts observed in the region of taut band palpated by the physician; and (III) cervical spine. Archives of Physical Medicine and Rehabilitation 2007 88, 1658-1661DOI: (10.1016/j.apmr.2007.07.020) Copyright © 2007 American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation Terms and Conditions