B Friedrich1,2, M Wostrack3, F Ringel3, Y-M Ryang3, A Förschler4, S Waldt5, C Zimmer4, M Nittka6, C Preibisch4. 1. Department of Neuroradiology, Klinikum rechts der Isar, Ismaningerstr. 22, 81675, Munich, Germany. benjamin.friedrich@tum.de. 2. Department of diagnostic and interventional Radiology, University Hospital Leipzig, Leipzig, Germany. benjamin.friedrich@tum.de. 3. Department of Neurosurgery, Klinikum rechts der Isar, Munich, Germany. 4. Department of Neuroradiology, Klinikum rechts der Isar, Ismaningerstr. 22, 81675, Munich, Germany. 5. Department of Radiology, Klinikum rechts der Isar, Munich, Germany. 6. Siemens Healthcare, Erlangen, Germany.
Abstract
PURPOSE: The MR image quality after intracranial aneurysm clipping is often impaired because of artifacts induced by metal implants. The purpose of the present study was to evaluate the benefit of a new WARP sequence with slice-encoding metal artifact correction (SEMAC) and view-angle tilting (VAT) MR imaging as novel artifact reduction techniques. MATERIALS AND METHODS: A new WARP TSE (a work-in-progress software package provided by Siemens Healthcare) sequence was implemented for cranial applications based on a turbo spin echo (TSE) sequence. T1- and T2-weighted images with standard and WARP TSE sequences were acquired from 6 patients with 11 clipping sites, and the images were compared based on artifact size and general image quality. RESULTS: T2- and T1-weighted WARP TSE sequences resulted in a highly significant reduction of metal artifacts compared with standard sequences (T2w- WARP TSE: 89.8 ± 1.4 %; T1w- WARP TSE: 84.9 ± 2.9 %; p < 0.001) without a substantial loss of image quality. CONCLUSION: The use of a new WARP TSE sequence after aneurysm clipping is highly beneficial for increasing the diagnostic MR image quality due to a striking reduction of metal artifacts.
PURPOSE: The MR image quality after intracranial aneurysm clipping is often impaired because of artifacts induced by metal implants. The purpose of the present study was to evaluate the benefit of a new WARP sequence with slice-encoding metal artifact correction (SEMAC) and view-angle tilting (VAT) MR imaging as novel artifact reduction techniques. MATERIALS AND METHODS: A new WARP TSE (a work-in-progress software package provided by Siemens Healthcare) sequence was implemented for cranial applications based on a turbo spin echo (TSE) sequence. T1- and T2-weighted images with standard and WARP TSE sequences were acquired from 6 patients with 11 clipping sites, and the images were compared based on artifact size and general image quality. RESULTS: T2- and T1-weighted WARP TSE sequences resulted in a highly significant reduction of metal artifacts compared with standard sequences (T2w- WARP TSE: 89.8 ± 1.4 %; T1w- WARP TSE: 84.9 ± 2.9 %; p < 0.001) without a substantial loss of image quality. CONCLUSION: The use of a new WARP TSE sequence after aneurysm clipping is highly beneficial for increasing the diagnostic MR image quality due to a striking reduction of metal artifacts.
Authors: Charles B L M Majoie; Marieke E Sprengers; Willem Jan J van Rooij; Cristina Lavini; Menno Sluzewski; Jeroen C van Rijn; Gerard J den Heeten Journal: AJNR Am J Neuroradiol Date: 2005 Jun-Jul Impact factor: 3.825
Authors: Christina A Chen; Weitian Chen; Stuart B Goodman; Brian A Hargreaves; Kevin M Koch; Wenmaio Lu; Anja C Brau; Christine E Draper; Scott L Delp; Garry E Gold Journal: J Magn Reson Imaging Date: 2011-05 Impact factor: 4.813