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MR imaging of healthy knees in varying degrees of flexion using a stretchable coil array provides comparable image quality compared to a standard knee coil array


Nordmeyer-Massner, Jurek A; Pruessmann, Klaas P; Wyss R T, Michael; Manoliu, Andrei; Hodler, Jürg; Andreisek, Gustav; Mamisch-Saupe, Nadja (2016). MR imaging of healthy knees in varying degrees of flexion using a stretchable coil array provides comparable image quality compared to a standard knee coil array. European Journal of Radiology, 85(3):518-523.

Abstract

Objective: Stretchable coils allow knee imaging at varying degrees of flexion. Purpose was to compare a new-developed stretchable 8-channel to a standard 8-channel knee coil array by means of quantitative and qualitative image analysis.
Material and methods: IRB approved prospective study. Knee MR imaging in 10 healthy volunteers was performed at 3T using a standard 8-channel and a new-developed stretchable 8-channel coil array at 0°, 45°, and 60° of flexion and at 0° (standard coil). Image parameters were identical. Signal-to-noise ratio (SNR) was determined by combining the images with separately acquired noise data on a pixel-by-pixel basis using MATLAB routines (Natick, MA, USA). Images were qualitatively analysed by two independent radiologists who graded the visibility of several anatomic structures from 1 = not visible to 5 = excellent. ANOVA, Wilcoxon and kappa statistics were used.
Results: Mean SNR ± standarddeviation of bone was 54.7 ± 10.4 and of muscle 28.0 ± 4.4 using the stretchable coil array and 54.6 ± 8.2 and 33.4 ± 4.5, respectively, using the standard knee coil array. No statistically significant SNR differences were found between both arrays (bone, p = 0.960; muscle, p = 0.132). SNR was not degraded at higher degrees of flexion. The qualitative image analysis did not reveal statistically significant differences between the stretchable and standard coil array with regard to the visibility of anatomic structures (p = 0.026–1.000). Overall kappa was 0.714.
Conclusion: Stretchable 8-channel coil arrays provide similar SNR and visibility of anatomic structures compared to standard 8-channel knee coil arrays. MR imaging with high SNR will now be possible in flexed knees.

Abstract

Objective: Stretchable coils allow knee imaging at varying degrees of flexion. Purpose was to compare a new-developed stretchable 8-channel to a standard 8-channel knee coil array by means of quantitative and qualitative image analysis.
Material and methods: IRB approved prospective study. Knee MR imaging in 10 healthy volunteers was performed at 3T using a standard 8-channel and a new-developed stretchable 8-channel coil array at 0°, 45°, and 60° of flexion and at 0° (standard coil). Image parameters were identical. Signal-to-noise ratio (SNR) was determined by combining the images with separately acquired noise data on a pixel-by-pixel basis using MATLAB routines (Natick, MA, USA). Images were qualitatively analysed by two independent radiologists who graded the visibility of several anatomic structures from 1 = not visible to 5 = excellent. ANOVA, Wilcoxon and kappa statistics were used.
Results: Mean SNR ± standarddeviation of bone was 54.7 ± 10.4 and of muscle 28.0 ± 4.4 using the stretchable coil array and 54.6 ± 8.2 and 33.4 ± 4.5, respectively, using the standard knee coil array. No statistically significant SNR differences were found between both arrays (bone, p = 0.960; muscle, p = 0.132). SNR was not degraded at higher degrees of flexion. The qualitative image analysis did not reveal statistically significant differences between the stretchable and standard coil array with regard to the visibility of anatomic structures (p = 0.026–1.000). Overall kappa was 0.714.
Conclusion: Stretchable 8-channel coil arrays provide similar SNR and visibility of anatomic structures compared to standard 8-channel knee coil arrays. MR imaging with high SNR will now be possible in flexed knees.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > University Hospital Zurich > Clinic for Diagnostic and Interventional Radiology
04 Faculty of Medicine > Institute of Biomedical Engineering
Dewey Decimal Classification:170 Ethics
610 Medicine & health
Language:English
Date:2016
Deposited On:21 Jan 2016 13:47
Last Modified:05 Apr 2016 19:57
Publisher:Elsevier
ISSN:0720-048X
Publisher DOI:https://doi.org/10.1016/j.ejrad.2015.12.004

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