The Role of Dynamic Magnetic Resonance Imaging in the Detection of Lesions of the Ulnocarpal Complex

1996 ◽  
Vol 21 (3) ◽  
pp. 311-314 ◽  
Author(s):  
M. Gabl ◽  
M. Lener ◽  
S. Pechlaner ◽  
W. Judmaier
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Dynamic Mri ◽  
Dynamic Magnetic Resonance Imaging ◽  
Resonance Imaging ◽  
Non Invasive ◽  
Dynamic Magnetic Resonance ◽  
Magnetic Resonance Imaging Mri ◽  
The Stability ◽  
A Prospective Study

A prospective study of 32 patients was carried out to investigate the significance of dynamic magnetic resonance imaging (MRI) in diagnosis of triangular fibrocartilage (TFC) lesions. Tears of the TFC can be diagnosed well by means of static MRI and arthroscopy. Dynamic MRI examination has an advantage in evaluating the stability of the TFC and ulnocarpal impingement. By means of dynamic MRI it was possible to make a preoperative diagnosis of an ulnocarpal impingement in five patients, a diagnosis which was confirmed through arthroscopy in all cases. In three further patients, dynamic MRI showed ulnocarpal impingement caused by instability of the ulnar attachment of the TFC. This kind of impingement could not be ascertained arthroscopically. Dynamic MRI extends the possibilities of evaluating obscure ulnar wrist pain. Its significance lies in the non-invasive examination of ulnocarpal impingement as well as the evaluation of TFC stability.

scholarly journals Velopharyngeal Structural and Functional Assessment of Speech in Young Children Using Dynamic Magnetic Resonance Imaging

2017 ◽  
Vol 54 (4) ◽  
pp. 408-422 ◽  
Author(s):  
Jamie L. Perry ◽  
David P. Kuehn ◽  
Bradley P. Sutton ◽  
Xiangming Fang
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Young Children ◽  
Muscle Contraction ◽  
Dynamic Mri ◽  
Dynamic Magnetic Resonance Imaging ◽  
Levator Muscle ◽  
Resonance Imaging ◽  
Dynamic Magnetic Resonance ◽  
Velopharyngeal Closure

Objective The purpose of this study was to demonstrate a novel method for examining the velopharyngeal mechanism using static and dynamic magnetic resonance imaging (MRI) at the sentence-level production in young children with normal anatomy. This study examined whether velopharyngeal events occurring in the midsagittal plane are correlated to muscle events occurring along the plane of velopharyngeal closure. Adenoid involvement in velopharyngeal function was also explored. Methods A high-resolution, T2-weighted turbo-spin-echo three-dimensional anatomical scan was used to acquire static velopharyngeal data and a fast-gradient echo fast low angle shot multishot spiral technique (15.8 frames per second) was used to acquire dynamic data on 11 children between 4 and 9 years old. Results Changes in velar knee height from rest to the bilabial /p/ production was strongly correlated with changes in the velar configuration ( r = 0.680, P = .021) and levator muscle contraction ( r = 0.703, P = .016). Velar configuration was highly correlated to levator muscle changes ( r = 0.685, P = .020). Mean alpha angle during bilabial /p/ production was 176°, which demonstrated that subjects achieve velopharyngeal closure at or just below the palatal plane. Subjects with a larger adenoid pad used significantly less ( r = –0.660, P = .027) levator muscle contraction compared with individuals with smaller adenoids. Conclusions This study demonstrates a potentially useful technique in dynamic MRI that does not rely on cyclic repetitions or sustained phonation. This study lends support to the clinical potential of dynamic MRI methods for cleft palate management.

scholarly journals Non-invasive diagnostics in fossils - Magnetic Resonance Imaging of pathological belemnites

2005 ◽  
Vol 2 (2) ◽  
pp. 133-140 ◽  
Author(s):  
D. Mietchen ◽  
H. Keupp ◽  
B. Manz ◽  
F. Volke
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Soft Tissue ◽  
Clinical Diagnostics ◽  
Resonance Imaging ◽  
Non Invasive ◽  
Physiological Processes ◽  
Magnetic Resonance Imaging Mri ◽  
Invasive Diagnostics

Abstract. For more than a decade, Magnetic Resonance Imaging (MRI) has been routinely employed in clinical diagnostics because it allows non-invasive studies of anatomical structures and physiological processes in vivo and to differentiate between healthy and pathological states, particularly of soft tissue. Here, we demonstrate that MRI can likewise be applied to fossilized biological samples and help in elucidating paleopathological and paleoecological questions: Five anomalous guards of Jurassic and Cretaceous belemnites are presented along with putative paleopathological diagnoses directly derived from 3D MR images with microscopic resolution. Syn vivo deformities of both the mineralized internal rostrum and the surrounding former soft tissue can be traced back in part to traumatic events of predator-prey-interactions, and partly to parasitism. Besides, evidence is presented that the frequently observed anomalous apical collar might be indicative of an inflammatory disease. These findings highlight the potential of Magnetic Resonance techniques for further paleontological applications.

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