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http://dx.doi.org/10.13104/jksmrm.2013.17.2.110

Quantitative Assessment and Ligament Traceability of Volume Isotropic Turbo Spin Echo Acquisition (VISTA) Ankle Magnetic Resonance Imaging: Fat Suppression versus without Fat Suppression  

Cho, Kyung Eun (Department of Radiology, Gangnam Severance Hospital, Yonsei University)
Yoon, Choon-Sik (Department of Radiology, Gangnam Severance Hospital, Yonsei University)
Song, Ho-Taek (Department of Radiology, Severance Hospital, Yonsei University College of Medicine)
Lee, Young Han (Department of Radiology, Severance Hospital, Yonsei University College of Medicine)
Lim, Daekeon (Department of Radiology, Severance Hospital, Yonsei University College of Medicine)
Suh, Jin-Suck (Department of Radiology, Severance Hospital, Yonsei University College of Medicine)
Kim, Sungjun (Department of Radiology, Gangnam Severance Hospital, Yonsei University)
Publication Information
Investigative Magnetic Resonance Imaging / v.17, no.2, 2013 , pp. 110-122 More about this Journal
Abstract
Purpose : To compare the image quality and ligament traceability in ankle images obtained using Volume Isotropic Turbo Spin Echo Acquisition (VISTA) MRI with and without fat suppression. Materials and Methods: The signal-to-noise ratios (SNRs) in images from a phantom and from the ankle of a volunteer were compared. Ten ankles from 10 non-symptomatic volunteers were imaged for comparisons of contrast ratio (CR) and ligament traceability. All examinations were performed using VISTA sequences with and without fat suppression on a 3T MRI scanner. The SNRs were obtained from images with subjects and without subjects (noise-only). Contrast ratios from images of the 10 ankles were acquired between fluid and tendon (F-T), F-cartilage (C), F-ligament (L), fat (f)-T, f-C and f-L. Two musculoskeletal radiologists independently scored the traceability of 7 ligaments, in sagittal, axial and coronal images respectively, based on a 4-point scale (1 as not traceable through 4 as clearly traceable). The Wilcoxon signed-rank test was used to compare the CR. Fisher's exact test and Pearson's chi-squared test were used to compare the ligament traceability. Results: The SNRs did not differ significantly between the two sequences except in bone marrow. VISTA SPAIR showed the higher CR only in F-T (p = 0.04), whereas VISTA showed higher CR in f-T (p = 0.005), f-C (p = 0.005) and f-L (p = 0.005). The calcaneofibular ligament traceability with VISTA was superior to that obtained with VISTA SPAIR (p < 0.05) in all planes. Conclusion: VISTA showed significant superiority to VISTA SPAIR in tracing CFL due to the superior CR between fat and ligament.
Keywords
Magnetic resonance imaging (MRI); Ankle; 3D isotropic imaging; Fat suppression; Ligaments;
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