Cargando…

Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images

PURPOSE: To compare short tau inversion recovery (STIR) images with slice encoding for metal artifact correction (SEMAC)-corrected magnetic resonance imaging (MRI) of spectral presaturation with inversion recovery (SPIR) or inversion recovery (IR) at 3T in patients with metallic spinal instrumentati...

Descripción completa

Detalles Bibliográficos
Autores principales: LEE, Young Han, HAHN, Seok, KIM, Eunju, SUH, Jin-Suck
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Japanese Society for Magnetic Resonance in Medicine 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5608111/
https://www.ncbi.nlm.nih.gov/pubmed/26902679
http://dx.doi.org/10.2463/mrms.mp.2015-0055
_version_ 1783265385158541312
author LEE, Young Han
HAHN, Seok
KIM, Eunju
SUH, Jin-Suck
author_facet LEE, Young Han
HAHN, Seok
KIM, Eunju
SUH, Jin-Suck
author_sort LEE, Young Han
collection PubMed
description PURPOSE: To compare short tau inversion recovery (STIR) images with slice encoding for metal artifact correction (SEMAC)-corrected magnetic resonance imaging (MRI) of spectral presaturation with inversion recovery (SPIR) or inversion recovery (IR) at 3T in patients with metallic spinal instrumentation. METHODS: Following institutional review board’s approval, 71 vertebrae with interbody fixation in 26 patients who underwent transpedicular spondylodesis with spinal metallic prostheses were analyzed with SEMAC spinal MRI. All the fixated vertebrae were examined with STIR, and 41 vertebrae of 15 patients were scanned with SEMAC-SPIR T(2)-weighted MRI. The remaining 30 vertebrae of 11 patients were scanned with SEMAC-IR T(2)-weighted MRI. Two musculoskeletal radiologists compared the image sets and qualitatively analyzed the images with a five-point scale that included artifact reduction around the metallic implant and visualization of the rod and pedicle. Quantitative assessments were performed by calculating the signal intensity ratio of the fixated vertebra and non-metallic vertebra and by calculating the signal-to-noise ratios (SNRs) of the vertebrae. A paired t-test was used for the statistical analyses. RESULTS: The SEMAC-IR MRI had a significant decrease in the metallic artifact area (P < 0.05), while the SEMAC-SPIR MRI yielded significantly increased artifact areas (P < 0.05). However, the signal intensity ratios (i.e., metal-induced signal pile-up) were not significantly different (P > 0.05) between the STIR and SEMAC MRI. The SNR of the SEMAC MRI was significantly lower than the SNR of the STIR (P < 0.05). The metal artifact reduction scores were significantly higher in the SEMAC-SPIR MRI (P < 0.05). CONCLUSION: Despite the relatively larger artifact size and lower SNRs, the SEMAC-SPIR MRI was superior to the other types of fat-suppressed MRI of SEMAC-IR or T(2)-weighted STIR MRI. However, the drawbacks of high signal pile-up, large artifact size, and relatively low SNRs require further investigation to determine the best method for fat-suppressed MRI of metallic implants.
format Online
Article
Text
id pubmed-5608111
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher Japanese Society for Magnetic Resonance in Medicine
record_format MEDLINE/PubMed
spelling pubmed-56081112017-10-23 Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images LEE, Young Han HAHN, Seok KIM, Eunju SUH, Jin-Suck Magn Reson Med Sci Major Paper PURPOSE: To compare short tau inversion recovery (STIR) images with slice encoding for metal artifact correction (SEMAC)-corrected magnetic resonance imaging (MRI) of spectral presaturation with inversion recovery (SPIR) or inversion recovery (IR) at 3T in patients with metallic spinal instrumentation. METHODS: Following institutional review board’s approval, 71 vertebrae with interbody fixation in 26 patients who underwent transpedicular spondylodesis with spinal metallic prostheses were analyzed with SEMAC spinal MRI. All the fixated vertebrae were examined with STIR, and 41 vertebrae of 15 patients were scanned with SEMAC-SPIR T(2)-weighted MRI. The remaining 30 vertebrae of 11 patients were scanned with SEMAC-IR T(2)-weighted MRI. Two musculoskeletal radiologists compared the image sets and qualitatively analyzed the images with a five-point scale that included artifact reduction around the metallic implant and visualization of the rod and pedicle. Quantitative assessments were performed by calculating the signal intensity ratio of the fixated vertebra and non-metallic vertebra and by calculating the signal-to-noise ratios (SNRs) of the vertebrae. A paired t-test was used for the statistical analyses. RESULTS: The SEMAC-IR MRI had a significant decrease in the metallic artifact area (P < 0.05), while the SEMAC-SPIR MRI yielded significantly increased artifact areas (P < 0.05). However, the signal intensity ratios (i.e., metal-induced signal pile-up) were not significantly different (P > 0.05) between the STIR and SEMAC MRI. The SNR of the SEMAC MRI was significantly lower than the SNR of the STIR (P < 0.05). The metal artifact reduction scores were significantly higher in the SEMAC-SPIR MRI (P < 0.05). CONCLUSION: Despite the relatively larger artifact size and lower SNRs, the SEMAC-SPIR MRI was superior to the other types of fat-suppressed MRI of SEMAC-IR or T(2)-weighted STIR MRI. However, the drawbacks of high signal pile-up, large artifact size, and relatively low SNRs require further investigation to determine the best method for fat-suppressed MRI of metallic implants. Japanese Society for Magnetic Resonance in Medicine 2016-02-20 /pmc/articles/PMC5608111/ /pubmed/26902679 http://dx.doi.org/10.2463/mrms.mp.2015-0055 Text en © 2016 Japanese Society for Magnetic Resonance in Medicine http://creativecommons.org/licenses/by/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives International License.
spellingShingle Major Paper
LEE, Young Han
HAHN, Seok
KIM, Eunju
SUH, Jin-Suck
Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images
title Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images
title_full Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images
title_fullStr Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images
title_full_unstemmed Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images
title_short Fat-suppressed MR Imaging of the Spine for Metal Artifact Reduction at 3T: Comparison of STIR and Slice Encoding for Metal Artifact Correction Fat-suppressed T(2)-weighted Images
title_sort fat-suppressed mr imaging of the spine for metal artifact reduction at 3t: comparison of stir and slice encoding for metal artifact correction fat-suppressed t(2)-weighted images
topic Major Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5608111/
https://www.ncbi.nlm.nih.gov/pubmed/26902679
http://dx.doi.org/10.2463/mrms.mp.2015-0055
work_keys_str_mv AT leeyounghan fatsuppressedmrimagingofthespineformetalartifactreductionat3tcomparisonofstirandsliceencodingformetalartifactcorrectionfatsuppressedt2weightedimages
AT hahnseok fatsuppressedmrimagingofthespineformetalartifactreductionat3tcomparisonofstirandsliceencodingformetalartifactcorrectionfatsuppressedt2weightedimages
AT kimeunju fatsuppressedmrimagingofthespineformetalartifactreductionat3tcomparisonofstirandsliceencodingformetalartifactcorrectionfatsuppressedt2weightedimages
AT suhjinsuck fatsuppressedmrimagingofthespineformetalartifactreductionat3tcomparisonofstirandsliceencodingformetalartifactcorrectionfatsuppressedt2weightedimages