Quantitative assessment of biliary stent artifacts on MR images: Potential implications for target delineation in radiotherapy

Oliver J. Gurney-Champion, Thijs Bruins Slot, Eelco Lens, Astrid van der Horst, Remy Klaassen, Hanneke W. M. van Laarhoven, Geertjan van Tienhoven, Jeanin E. van Hooft, Aart J. Nederveen, Arjan Bel

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Purpose: Biliary stents may cause susceptibility artifacts, gradient-induced artifacts, and radio frequency (RF) induced artifacts on magnetic resonance images, which can hinder accurate target volume delineation in radiotherapy. In this study, the authors investigated and quantified the magnitude of these artifacts for stents of different materials. Methods: Eight biliary stents made of nitinol, platinum-cored nitinol, stainless steel, or polyethylene from seven vendors, with different lengths (57-98 mm) and diameters (3.0-11.7 mm), were placed in a phantom. To quantify the susceptibility artifacts sequence-independently, ΔB0-maps and T2∗-maps were acquired at 1.5 and 3 T. To study the effect of the gradient-induced artifacts at 3 T, signal decay in images obtained with maximum readout gradient-induced artifacts was compared to signal decay in reference scans. To quantify the RF induced artifacts at 3 T, B1-maps were acquired. Finally, ΔB0-maps and T2∗-maps were acquired at 3 T of two pancreatic cancer patients who had received platinum-cored nitinol biliary stents. Results: Outside the stent, susceptibility artifacts dominated the other artifacts. The stainless steel stent produced the largest susceptibility artifacts. The other stents caused decreased T2∗ up to 5.1 mm (1.5 T) and 8.5 mm (3 T) from the edge of the stent. For sequences with a higher bandwidth per voxel (1.5 T: BWvox > 275 Hz/voxel; 3 T: BWvox > 500 Hz/voxel), the B0-related susceptibility artifacts were negligible (<0.2 voxels). The polyethylene stent showed no artifacts. In vivo, the changes in B0 and T2∗ induced by the stent were larger than typical variations in B0 and T2∗ induced by anatomy when the stent was at an angle of 30° with the main magnetic field. Conclusions: Susceptibility artifacts were dominating over the other artifacts. The magnitudes of the susceptibility artifacts were determined sequence-independently. This method allows to include additional safety margins that ensure target irradiation.
Original languageEnglish
Pages (from-to)5603-5615
JournalMedical Physics
Volume43
Issue number10
DOIs
Publication statusPublished - 2016
Externally publishedYes

Cite this

Gurney-Champion, Oliver J. ; Bruins Slot, Thijs ; Lens, Eelco ; van der Horst, Astrid ; Klaassen, Remy ; van Laarhoven, Hanneke W. M. ; van Tienhoven, Geertjan ; van Hooft, Jeanin E. ; Nederveen, Aart J. ; Bel, Arjan. / Quantitative assessment of biliary stent artifacts on MR images: Potential implications for target delineation in radiotherapy. In: Medical Physics. 2016 ; Vol. 43, No. 10. pp. 5603-5615.
@article{00ed7c8621c74cd191c00e2b666d041c,
title = "Quantitative assessment of biliary stent artifacts on MR images: Potential implications for target delineation in radiotherapy",
abstract = "Purpose: Biliary stents may cause susceptibility artifacts, gradient-induced artifacts, and radio frequency (RF) induced artifacts on magnetic resonance images, which can hinder accurate target volume delineation in radiotherapy. In this study, the authors investigated and quantified the magnitude of these artifacts for stents of different materials. Methods: Eight biliary stents made of nitinol, platinum-cored nitinol, stainless steel, or polyethylene from seven vendors, with different lengths (57-98 mm) and diameters (3.0-11.7 mm), were placed in a phantom. To quantify the susceptibility artifacts sequence-independently, ΔB0-maps and T2∗-maps were acquired at 1.5 and 3 T. To study the effect of the gradient-induced artifacts at 3 T, signal decay in images obtained with maximum readout gradient-induced artifacts was compared to signal decay in reference scans. To quantify the RF induced artifacts at 3 T, B1-maps were acquired. Finally, ΔB0-maps and T2∗-maps were acquired at 3 T of two pancreatic cancer patients who had received platinum-cored nitinol biliary stents. Results: Outside the stent, susceptibility artifacts dominated the other artifacts. The stainless steel stent produced the largest susceptibility artifacts. The other stents caused decreased T2∗ up to 5.1 mm (1.5 T) and 8.5 mm (3 T) from the edge of the stent. For sequences with a higher bandwidth per voxel (1.5 T: BWvox > 275 Hz/voxel; 3 T: BWvox > 500 Hz/voxel), the B0-related susceptibility artifacts were negligible (<0.2 voxels). The polyethylene stent showed no artifacts. In vivo, the changes in B0 and T2∗ induced by the stent were larger than typical variations in B0 and T2∗ induced by anatomy when the stent was at an angle of 30° with the main magnetic field. Conclusions: Susceptibility artifacts were dominating over the other artifacts. The magnitudes of the susceptibility artifacts were determined sequence-independently. This method allows to include additional safety margins that ensure target irradiation.",
author = "Gurney-Champion, {Oliver J.} and {Bruins Slot}, Thijs and Eelco Lens and {van der Horst}, Astrid and Remy Klaassen and {van Laarhoven}, {Hanneke W. M.} and {van Tienhoven}, Geertjan and {van Hooft}, {Jeanin E.} and Nederveen, {Aart J.} and Arjan Bel",
year = "2016",
doi = "10.1118/1.4962476",
language = "English",
volume = "43",
pages = "5603--5615",
journal = "Medical Physics",
issn = "0094-2405",
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Gurney-Champion, OJ, Bruins Slot, T, Lens, E, van der Horst, A, Klaassen, R, van Laarhoven, HWM, van Tienhoven, G, van Hooft, JE, Nederveen, AJ & Bel, A 2016, 'Quantitative assessment of biliary stent artifacts on MR images: Potential implications for target delineation in radiotherapy' Medical Physics, vol. 43, no. 10, pp. 5603-5615. https://doi.org/10.1118/1.4962476

Quantitative assessment of biliary stent artifacts on MR images: Potential implications for target delineation in radiotherapy. / Gurney-Champion, Oliver J.; Bruins Slot, Thijs; Lens, Eelco; van der Horst, Astrid; Klaassen, Remy; van Laarhoven, Hanneke W. M.; van Tienhoven, Geertjan; van Hooft, Jeanin E.; Nederveen, Aart J.; Bel, Arjan.

In: Medical Physics, Vol. 43, No. 10, 2016, p. 5603-5615.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Quantitative assessment of biliary stent artifacts on MR images: Potential implications for target delineation in radiotherapy

AU - Gurney-Champion, Oliver J.

AU - Bruins Slot, Thijs

AU - Lens, Eelco

AU - van der Horst, Astrid

AU - Klaassen, Remy

AU - van Laarhoven, Hanneke W. M.

AU - van Tienhoven, Geertjan

AU - van Hooft, Jeanin E.

AU - Nederveen, Aart J.

AU - Bel, Arjan

PY - 2016

Y1 - 2016

N2 - Purpose: Biliary stents may cause susceptibility artifacts, gradient-induced artifacts, and radio frequency (RF) induced artifacts on magnetic resonance images, which can hinder accurate target volume delineation in radiotherapy. In this study, the authors investigated and quantified the magnitude of these artifacts for stents of different materials. Methods: Eight biliary stents made of nitinol, platinum-cored nitinol, stainless steel, or polyethylene from seven vendors, with different lengths (57-98 mm) and diameters (3.0-11.7 mm), were placed in a phantom. To quantify the susceptibility artifacts sequence-independently, ΔB0-maps and T2∗-maps were acquired at 1.5 and 3 T. To study the effect of the gradient-induced artifacts at 3 T, signal decay in images obtained with maximum readout gradient-induced artifacts was compared to signal decay in reference scans. To quantify the RF induced artifacts at 3 T, B1-maps were acquired. Finally, ΔB0-maps and T2∗-maps were acquired at 3 T of two pancreatic cancer patients who had received platinum-cored nitinol biliary stents. Results: Outside the stent, susceptibility artifacts dominated the other artifacts. The stainless steel stent produced the largest susceptibility artifacts. The other stents caused decreased T2∗ up to 5.1 mm (1.5 T) and 8.5 mm (3 T) from the edge of the stent. For sequences with a higher bandwidth per voxel (1.5 T: BWvox > 275 Hz/voxel; 3 T: BWvox > 500 Hz/voxel), the B0-related susceptibility artifacts were negligible (<0.2 voxels). The polyethylene stent showed no artifacts. In vivo, the changes in B0 and T2∗ induced by the stent were larger than typical variations in B0 and T2∗ induced by anatomy when the stent was at an angle of 30° with the main magnetic field. Conclusions: Susceptibility artifacts were dominating over the other artifacts. The magnitudes of the susceptibility artifacts were determined sequence-independently. This method allows to include additional safety margins that ensure target irradiation.

AB - Purpose: Biliary stents may cause susceptibility artifacts, gradient-induced artifacts, and radio frequency (RF) induced artifacts on magnetic resonance images, which can hinder accurate target volume delineation in radiotherapy. In this study, the authors investigated and quantified the magnitude of these artifacts for stents of different materials. Methods: Eight biliary stents made of nitinol, platinum-cored nitinol, stainless steel, or polyethylene from seven vendors, with different lengths (57-98 mm) and diameters (3.0-11.7 mm), were placed in a phantom. To quantify the susceptibility artifacts sequence-independently, ΔB0-maps and T2∗-maps were acquired at 1.5 and 3 T. To study the effect of the gradient-induced artifacts at 3 T, signal decay in images obtained with maximum readout gradient-induced artifacts was compared to signal decay in reference scans. To quantify the RF induced artifacts at 3 T, B1-maps were acquired. Finally, ΔB0-maps and T2∗-maps were acquired at 3 T of two pancreatic cancer patients who had received platinum-cored nitinol biliary stents. Results: Outside the stent, susceptibility artifacts dominated the other artifacts. The stainless steel stent produced the largest susceptibility artifacts. The other stents caused decreased T2∗ up to 5.1 mm (1.5 T) and 8.5 mm (3 T) from the edge of the stent. For sequences with a higher bandwidth per voxel (1.5 T: BWvox > 275 Hz/voxel; 3 T: BWvox > 500 Hz/voxel), the B0-related susceptibility artifacts were negligible (<0.2 voxels). The polyethylene stent showed no artifacts. In vivo, the changes in B0 and T2∗ induced by the stent were larger than typical variations in B0 and T2∗ induced by anatomy when the stent was at an angle of 30° with the main magnetic field. Conclusions: Susceptibility artifacts were dominating over the other artifacts. The magnitudes of the susceptibility artifacts were determined sequence-independently. This method allows to include additional safety margins that ensure target irradiation.

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