Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patients
<p>Abstract</p> <p>Background</p> <p>The application of advanced 3T MRI imaging techniques to study recovery after subarachnoid hemorrhage (SAH) is complicated by the presence of image artifacts produced by implanted aneurysm clips. To characterize the effect of these a...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2011-10-01
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| Series: | BMC Medical Imaging |
| Subjects: | |
| Online Access: | http://www.biomedcentral.com/1471-2342/11/19 |
| _version_ | 1818493246282661888 |
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| author | Kim Dong H Suzuki Shuichi Rohlffs Fiona Khursheed Faraz Ellmore Timothy M |
| author_facet | Kim Dong H Suzuki Shuichi Rohlffs Fiona Khursheed Faraz Ellmore Timothy M |
| author_sort | Kim Dong H |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>The application of advanced 3T MRI imaging techniques to study recovery after subarachnoid hemorrhage (SAH) is complicated by the presence of image artifacts produced by implanted aneurysm clips. To characterize the effect of these artifacts on image quality, we sought to: 1) quantify extent of image artifact in SAH patients with implanted aneurysm clips across a range of MR sequences typically used in studies of volumetry, blood oxygen level dependent signal change (BOLD-fMRI), and diffusion-weighted imaging (DW-MRI) and 2) to explore the ability to reconstruct white matter pathways in these patients.</p> <p>Methods</p> <p>T1- and T2-weighted structural, BOLD-fMRI, and DW-MRI scans were acquired at 3T in two patients with titanium alloy clips in ACOM and left ACA respectively. Intensity-based planimetric contouring was performed on aligned image volumes to define each artifact. Artifact volumes were quantified by artifact/clip length and artifact/brain volume ratios and analyzed by two-way (scan-by-rater) ANOVAs. Tractography pathways were reconstructed from DW-MRI at varying distances from the artifacts using deterministic methods.</p> <p>Results</p> <p>Artifact volume varied by MR sequence for length (p = 0.007) and volume (p < 0.001) ratios: it was smallest for structural images, larger for DW-MRI acquisitions, and largest on fMRI images. Inter-rater reliability was high (r = 0.9626, p < 0.0001), and reconstruction of white matter connectivity characteristics increased with distance from the artifact border. In both patients, reconstructed white matter pathways of the uncinate fasciculus and inferior fronto-occipital fasciculus were clearly visible within 2 mm of the artifact border.</p> <p>Conclusions</p> <p>Advanced 3T MR can successfully image brain tissue around implanted titanium aneurysm clips at different spatial ranges depending on sequence type. White matter pathways near clip artifacts can be reconstructed and visualized. These findings provide a reference for designing functional and structural neuroimaging studies of recovery in aSAH patients after clip placement.</p> |
| first_indexed | 2024-12-10T17:52:18Z |
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| id | doaj.art-8728c4d3b3a947049b18548cf61c52c4 |
| institution | Directory Open Access Journal |
| issn | 1471-2342 |
| language | English |
| last_indexed | 2024-12-10T17:52:18Z |
| publishDate | 2011-10-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Medical Imaging |
| spelling | doaj.art-8728c4d3b3a947049b18548cf61c52c42022-12-22T01:39:02ZengBMCBMC Medical Imaging1471-23422011-10-011111910.1186/1471-2342-11-19Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patientsKim Dong HSuzuki ShuichiRohlffs FionaKhursheed FarazEllmore Timothy M<p>Abstract</p> <p>Background</p> <p>The application of advanced 3T MRI imaging techniques to study recovery after subarachnoid hemorrhage (SAH) is complicated by the presence of image artifacts produced by implanted aneurysm clips. To characterize the effect of these artifacts on image quality, we sought to: 1) quantify extent of image artifact in SAH patients with implanted aneurysm clips across a range of MR sequences typically used in studies of volumetry, blood oxygen level dependent signal change (BOLD-fMRI), and diffusion-weighted imaging (DW-MRI) and 2) to explore the ability to reconstruct white matter pathways in these patients.</p> <p>Methods</p> <p>T1- and T2-weighted structural, BOLD-fMRI, and DW-MRI scans were acquired at 3T in two patients with titanium alloy clips in ACOM and left ACA respectively. Intensity-based planimetric contouring was performed on aligned image volumes to define each artifact. Artifact volumes were quantified by artifact/clip length and artifact/brain volume ratios and analyzed by two-way (scan-by-rater) ANOVAs. Tractography pathways were reconstructed from DW-MRI at varying distances from the artifacts using deterministic methods.</p> <p>Results</p> <p>Artifact volume varied by MR sequence for length (p = 0.007) and volume (p < 0.001) ratios: it was smallest for structural images, larger for DW-MRI acquisitions, and largest on fMRI images. Inter-rater reliability was high (r = 0.9626, p < 0.0001), and reconstruction of white matter connectivity characteristics increased with distance from the artifact border. In both patients, reconstructed white matter pathways of the uncinate fasciculus and inferior fronto-occipital fasciculus were clearly visible within 2 mm of the artifact border.</p> <p>Conclusions</p> <p>Advanced 3T MR can successfully image brain tissue around implanted titanium aneurysm clips at different spatial ranges depending on sequence type. White matter pathways near clip artifacts can be reconstructed and visualized. These findings provide a reference for designing functional and structural neuroimaging studies of recovery in aSAH patients after clip placement.</p>http://www.biomedcentral.com/1471-2342/11/19artifactBOLD-fMRIdiffusion-weighted imaginginferior fronto-occipital fasciculusintracranial aneurysm clipmagnetic resonance imagingsubarachnoid hemorrhagetitanium alloyuncinate fasciculus |
| spellingShingle | Kim Dong H Suzuki Shuichi Rohlffs Fiona Khursheed Faraz Ellmore Timothy M Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patients BMC Medical Imaging artifact BOLD-fMRI diffusion-weighted imaging inferior fronto-occipital fasciculus intracranial aneurysm clip magnetic resonance imaging subarachnoid hemorrhage titanium alloy uncinate fasciculus |
| title | Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patients |
| title_full | Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patients |
| title_fullStr | Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patients |
| title_full_unstemmed | Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patients |
| title_short | Artifact quantification and tractography from 3T MRI after placement of aneurysm clips in subarachnoid hemorrhage patients |
| title_sort | artifact quantification and tractography from 3t mri after placement of aneurysm clips in subarachnoid hemorrhage patients |
| topic | artifact BOLD-fMRI diffusion-weighted imaging inferior fronto-occipital fasciculus intracranial aneurysm clip magnetic resonance imaging subarachnoid hemorrhage titanium alloy uncinate fasciculus |
| url | http://www.biomedcentral.com/1471-2342/11/19 |
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