Implications of Extracranial Distortion in Ultra-High-Field Magnetic Resonance Imaging for Image-Guided Cranial Neurosurgery

Voormolen, Eduard; Diederen, Sander J.H.; Woerdeman, Peter A.; Sprenkel, Jan Willem Berkelbach van der; Noordmans, Herke Jan; Visser, Fredy; Viergever, Max A.; Luijten, Peter R.; Hoogduin, Hans; Robe, Pierre A.

doi:10.1016/j.wneu.2019.02.028

Cited by 7 publications

(10 citation statements)

References 15 publications

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“…MRI: MRI is capable of displaying lesions and tumors of the nerve canal and allows volume calculations (75,76). Recent developments of MRI use 7-T and higher (77)(78)(79). Almost anatomical images can be achieved with these devices (77).…”

Section: Quality Of Imaging Panoramic Viewmentioning

confidence: 99%

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Unilaterally Enlarged Mandibular Foramina and Canal Associated With Hyperplastic Lymphatic Tissue of Inferior Alveolar Nerve: Case Report and Short Literature Survey

2019

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Section: Quality Of Imaging Panoramic Viewmentioning

confidence: 99%

“…Almost anatomical images can be achieved with these devices (77). However, 7-T MRI is sensitive to disturbance (79). Fundamental superiority of the imaging quality of MRI at 7-T versus 3-T is not yet assured for the presentation of tumors and lesions of the cranial nerves.…”

Section: Quality Of Imaging Panoramic Viewmentioning

confidence: 99%

Unilaterally Enlarged Mandibular Foramina and Canal Associated With Hyperplastic Lymphatic Tissue of Inferior Alveolar Nerve: Case Report and Short Literature Survey

2019

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“…Boutet et al [12] demonstrated the safety of coils and pulse sequences of 3-T MRI of DBS patients. Voormolen et al [13] found no visible intracranial distortion in magnetization-prepared T1-weighted 7-T MRI cranial images but considerable extracranial shifts for image-guided cranial neurosurgery.…”

Section: Introductionmentioning

confidence: 99%

Comparison between 1.5- and 3-T Magnetic Resonance Acquisitions for Direct Targeting Stereotactic Procedures for Deep Brain Stimulation: A Phantom Study

Poulen¹,

Seng²,

Champfleur³

et al. 2020

Stereotact Funct Neurosurg

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Introduction: Deep brain stimulation (DBS) is a well-established treatment for movement disorders. High magnetic fields could have an impact on distortion. We evaluated 1.5and 3-T magnetic resonance imaging (MRI) sequences for accuracy, precision, and trueness of our MRI-guided direct targeting protocol. Methods: Effects of distortion on MR sequences (T1-and T2-weighted sequences) can be evaluated using a dedicated phantom (Elekta). Field strength capabilities were assessed on Siemens Avanto (1.5 T) and Skyra (3 T) scanners. We assessed the precision of our stereotactic MRIguided procedure. Results: We focused on the risk of error due to a high field strength. Error values on the localizer box were between 0.4 and 0.7 mm at 1.5 T and between 0.6 and 2 mm at 3 T. The most accurate 1.5-T sequence is the 3D FLASH T1-weighted sequence, which had an accuracy value of 0.6 mm. At 3 T, the accuracy value of the isotropic 3D FLASH T1-weighted sequence was 1.6 mm. Conclusion: Given the millimetric size of stereotactic targets and electrodes, lead implantation for neuromodulation therapy needs to be accurate. We demonstrate that 3-T imaging could not be used for stereotaxy in our MRI-guided direct targeting protocol because of a risk of error induced by distortion.

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“…21 These negatively affect image registration and targeting accuracy, potentially leading to suboptimal outcomes and injury. 20,22 Tools have been developed to address distortion, and scanners implement correction with mapping functions as a postprocessing step. 23 However, millimetric distortions exist, which increase with the distance from the magnet isocenter, a particular concern for extracranial image localizers.…”

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confidence: 99%

The development of ultra–high field MRI guidance technology for neuronavigation

Rusheen

Goyal

Owen

et al. 2022

Journal of Neurosurgery

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OBJECTIVE Magnetic resonance imaging at 7T offers improved image spatial and contrast resolution for visualization of small brain nuclei targeted in neuromodulation. However, greater image geometric distortion and a lack of compatible instrumentation preclude implementation. In this report, the authors detail the development of a stereotactic image localizer and accompanying imaging sequences designed to mitigate geometric distortion, enabling accurate image registration and surgical planning of basal ganglia nuclei. METHODS Magnetization-prepared rapid acquisition with gradient echo (MPRAGE), fast gray matter acquisition T1 inversion recovery (FGATIR), T2-weighted, and T2*-weighted sequences were optimized for 7T in 9 human subjects to visualize basal ganglia nuclei, minimize image distortion, and maximize target contrast-to-noise and signal-to-noise ratios. Extracranial spatial distortions were mapped to develop a skull-contoured image localizer embedded with spherical silicone fiducials for improved MR image registration and target guidance. Surgical plan accuracy testing was initially performed in a custom-developed MRI phantom (n = 5 phantom studies) and finally in a human trial. RESULTS MPRAGE and T2*-weighted sequences had the best measures among global measures of image quality (3.8/4, p < 0.0001; and 3.7/4, p = 0.0002, respectively). Among basal ganglia nuclei, FGATIR outperformed MPRAGE for globus pallidus externus (GPe) visualization (2.67/4 vs 1.78/4, p = 0.008), and FGATIR, T2-weighted imaging, and T2*-weighted imaging outperformed MPRAGE for substantia nigra visualization (1.44/4 vs 2.56/4, p = 0.04; vs 2.56/4, p = 0.04; vs 2.67/4, p = 0.003). Extracranial distortion was lower in the head’s midregion compared with the base and apex ( 1.17–1.33 mm; MPRAGE and FGATIR, p < 0.0001; T2-weighted imaging, p > 0.05; and T2*-weighted imaging, p = 0.013). Fiducial placement on the localizer in low distortion areas improved image registration (fiducial registration error, 0.79–1.19 mm; p < 0.0001) and targeting accuracy (target registration error, 0.60–1.09 mm; p = 0.04). Custom surgical software and the refined image localizer enabled successful surgical planning in a human trial (fiducial registration error = 1.0 mm). CONCLUSIONS A skull-contoured image localizer that accounts for image distortion is necessary to enable high-accuracy 7T imaging–guided targeting for surgical neuromodulation. These results may enable improved clinical efficacy for the treatment of neurological disease.

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Implications of Extracranial Distortion in Ultra-High-Field Magnetic Resonance Imaging for Image-Guided Cranial Neurosurgery

Cited by 7 publications

References 15 publications

Unilaterally Enlarged Mandibular Foramina and Canal Associated With Hyperplastic Lymphatic Tissue of Inferior Alveolar Nerve: Case Report and Short Literature Survey

Unilaterally Enlarged Mandibular Foramina and Canal Associated With Hyperplastic Lymphatic Tissue of Inferior Alveolar Nerve: Case Report and Short Literature Survey

Comparison between 1.5- and 3-T Magnetic Resonance Acquisitions for Direct Targeting Stereotactic Procedures for Deep Brain Stimulation: A Phantom Study

The development of ultra–high field MRI guidance technology for neuronavigation

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