OBJECTIVE: : To compare signal- and contrast-to-noise-ratio (SNR, CNR), conspicuity values and subjective image quality characteristics of Silent MRI and conventional MRI in brain disorders at 3 T. METHODS: : 26 patients were prospectively examined with a 3 T MRI. Silent Scan was added to standardized MR protocol. Silenz T1 weighted (Tlw) and Silent T2 weighted (T2w) sequences were compared to standard Tlw and T2w. Analysis was performed quantitatively (SNR, CNR, conspicuity values) and by visual assessment on a 4-point scale with regard to lesion visibility, lesion delineation, grey-white differentiation and diagnostic usefulness. Data were analyzed using Wilcoxon signed-rank and Sign test. p ≤ 0.05 was considered significant. RESULTS: : Silenz Tlw vs Tlw provided decreased SNR, but increased CNR (SNRparenchyma, SNRlesion: p = 0.000, CNRlesion: p = 0.003). Silent T2w vs T2w showed better SNR and CNR values (SNRparenchyma, p = 0.014; SNRlesion, p = 0.005; CNRlesion, p = 0.005). Conspicuity values were not significantly different on Silenz Tlw vs Tlw and Silent T2w vs T2w. The visual assessment revealed Silenz Tlw to be significantly superior to Tlw in terms of grey- white differentiation (p = 0.000), lesion visibility (p = 0.003) and overall diagnostic usefulness (p = 0.001). In terms of Silent T2w vs T2w, there was a significant difference in grey-white differentiation in favour of Silent T2w (p = 0.016). CONCLUSION: : Silent Scan is suitable for 3 T with image quality characteristics comparable to conventional MRI. ADVANCES IN KNOWLEDGE:: Silent Scan has a diagnostic value comparable to conventional MRI, with the advantage of a quiet MR exam improving patient MR experience.
OBJECTIVE: : To compare signal- and contrast-to-noise-ratio (SNR, CNR), conspicuity values and subjective image quality characteristics of Silent MRI and conventional MRI in brain disorders at 3 T. METHODS: : 26 patients were prospectively examined with a 3 T MRI. Silent Scan was added to standardized MR protocol. Silenz T1 weighted (Tlw) and Silent T2 weighted (T2w) sequences were compared to standard Tlw and T2w. Analysis was performed quantitatively (SNR, CNR, conspicuity values) and by visual assessment on a 4-point scale with regard to lesion visibility, lesion delineation, grey-white differentiation and diagnostic usefulness. Data were analyzed using Wilcoxon signed-rank and Sign test. p ≤ 0.05 was considered significant. RESULTS: : Silenz Tlw vs Tlw provided decreased SNR, but increased CNR (SNRparenchyma, SNRlesion: p = 0.000, CNRlesion: p = 0.003). Silent T2w vs T2w showed better SNR and CNR values (SNRparenchyma, p = 0.014; SNRlesion, p = 0.005; CNRlesion, p = 0.005). Conspicuity values were not significantly different on Silenz Tlw vs Tlw and Silent T2w vs T2w. The visual assessment revealed Silenz Tlw to be significantly superior to Tlw in terms of grey- white differentiation (p = 0.000), lesion visibility (p = 0.003) and overall diagnostic usefulness (p = 0.001). In terms of Silent T2w vs T2w, there was a significant difference in grey-white differentiation in favour of Silent T2w (p = 0.016). CONCLUSION: : Silent Scan is suitable for 3 T with image quality characteristics comparable to conventional MRI. ADVANCES IN KNOWLEDGE:: Silent Scan has a diagnostic value comparable to conventional MRI, with the advantage of a quiet MR exam improving patient MR experience.
Authors: David B Stobo; Robert S Lindsay; John M Connell; Laurence Dunn; Kirsten P Forbes Journal: Clin Endocrinol (Oxf) Date: 2011-11 Impact factor: 3.478
Authors: Shawna N Jacob; Paula K Shear; Matthew Norris; Matthew Smith; Jeff Osterhage; Stephen M Strakowski; Michael Cerullo; David E Fleck; Jing-Huei Lee; James C Eliassen Journal: J Clin Exp Neuropsychol Date: 2015-06-10 Impact factor: 2.475