scholarly journals Three-Tesla Magnetic Resonance Imaging of Patients With Deep Brain Stimulators: Results From a Phantom Study and a Pilot Study in Patients

Neurosurgery ◽  
2020 ◽  
Author(s):  
Benjamin Davidson ◽  
Fred Tam ◽  
Benson Yang ◽  
Ying Meng ◽  
Clement Hamani ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Mri ◽  
Phantom Study ◽  
Voltage Amplitude ◽  
Resonance Imaging ◽  
Safety Testing ◽  
3T Mri ◽  
Activated State ◽  
Deep Brain

Abstract BACKGROUND Deep brain stimulation (DBS) is a standard of care treatment for multiple neurologic disorders. Although 3-tesla (3T) magnetic resonance imaging (MRI) has become the gold-standard modality for structural and functional imaging, most centers refrain from 3T imaging in patients with DBS devices in place because of safety concerns. 3T MRI could be used not only for structural imaging, but also for functional MRI to study the effects of DBS on neurocircuitry and optimize programming. OBJECTIVE To use an anthropomorphic phantom design to perform temperature and voltage safety testing on an activated DBS device during 3T imaging. METHODS An anthropomorphic 3D-printed human phantom was constructed and used to perform temperature and voltage testing on a DBS device during 3T MRI. Based on the phantom assessment, a cohort study was conducted in which 6 human patients underwent MRI with their DBS device in an activated (ON) state. RESULTS During the phantom study, temperature rises were under 2°C during all sequences, with the DBS in both the deactivated and activated states. Radiofrequency pulses from the MRI appeared to modulate the electrical discharge from the DBS, resulting in slight fluctuations of voltage amplitude. Six human subjects underwent MRI with their DBS in an activated state without any serious adverse events. One patient experienced stimulation-related side effects during T1-MPRAGE scanning with the DBS in an ON state because of radiofrequency-induced modulation of voltage amplitude. CONCLUSION Following careful phantom-based safety testing, 3T structural and functional MRI can be safely performed in subjects with activated deep brain stimulators.

scholarly journals Safety aspects of the PiCCO thermodilution-cardiac output catheter during magnetic resonance imaging at 3 Tesla

2021 ◽  
Author(s):  
Marieke Voet ◽  
Christiaan G. Overduin ◽  
Ernst L. Stille ◽  
Jurgen J. Fütterer ◽  
Joris Lemson
Keyword(s):  
Magnetic Resonance Imaging ◽  
Cardiac Output ◽  
Magnetic Resonance ◽  
Critically Ill ◽  
Cardiac Output Monitoring ◽  
Measured Temperature ◽  
Resonance Imaging ◽  
Worst Case ◽  
Thermodilution Cardiac Output ◽  
3T Mri

AbstractThermodilution cardiac output monitoring, using a thermistor-tipped intravascular catheter, is used in critically ill patients to guide hemodynamic therapy. Often, these patients also need magnetic resonance imaging (MRI) for diagnostic or prognostic reasons. As thermodilution catheters contain metal, they are considered MRI-unsafe and advised to be removed prior to investigation. However, removal and replacement of the catheter carries risks of bleeding, perforation and infection. This research is an in vitro safety assessment of the PiCCO™ thermodilution catheter during 3 T Magnetic Resonance Imaging (3T-MRI).  In a 3T-MRI environment, three different PiCCO™ catheter sizes were investigated in an agarose-gel, tissue mimicking phantom. Two temperature probes measured radiofrequency-induced heating; one at the catheter tip and one at a reference point. Magnetically induced catheter dislocation was assessed by visual observation as well as by analysis of the tomographic images. For all tested catheters, the highest measured temperature increase was 0.2 °C at the center of the bore and 0.3 °C under “worst-case” setting for the tested MRI pulse sequences. No magnetically induced catheter displacements were observed. Under the tested circumstances, no heating or dislocation of the PiCCO™ catheter was observed in a tissue mimicking phantom during 3T-MRI. Leaving the catheter in the critically ill patient during MRI investigation might pose a lower risk of complications than catheter removal and replacement.

Successful Deep Brain Stimulation Surgery With Intraoperative Magnetic Resonance Imaging on a Difficult Neuroacanthocytosis Case

Neurosurgery ◽  
2013 ◽  
Vol 73 (1) ◽  
pp. E184-E188 ◽  
Author(s):  
Thien Thien Lim ◽  
Hubert H. Fernandez ◽  
Scott Cooper ◽  
Kathryn Mary K. Wilson ◽  
Andre G. Machado
Keyword(s):  
Magnetic Resonance Imaging ◽  
Deep Brain Stimulation ◽  
Magnetic Resonance ◽  
General Anesthesia ◽  
Brain Stimulation ◽  
Resonance Imaging ◽  
Imaging Guidance ◽  
Intraoperative Magnetic Resonance Imaging ◽  
Magnetic Resonance Imaging Guidance ◽  
Deep Brain

Abstract BACKGROUND AND IMPORTANCE: Chorea acanthocytosis is a progressive hereditary neurodegenerative disorder characterized by hyperkinetic movements, seizures, and acanthocytosis in the absence of any lipid abnormality. Medical treatment is typically limited and disappointing. CLINICAL PRESENTATION: We report on a 32-year-old patient with chorea acanthocytosis with a failed attempt at awake deep brain stimulation (DBS) surgery due to intraoperative seizures and postoperative intracranial hematoma. He then underwent a second DBS operation, but under general anesthesia and with intraoperative magnetic resonance imaging guidance. Marked improvement in his dystonia, chorea, and overall quality of life was noted 2 and 8 months postoperatively. CONCLUSION: DBS surgery of the bilateral globus pallidus pars interna may be useful in controlling the hyperkinetic movements in neuroacanthocytosis. Because of the high propensity for seizures in this disorder, DBS performed under general anesthesia, with intraoperative magnetic resonance imaging guidance, may allow successful implantation while maintaining accurate target localization.

ISOLATION OF THE BRAIN‐RELATED FACTOR OF THE ERROR BETWEEN INTENDED AND ACHIEVED POSITION OF DEEP BRAIN STIMULATION ELECTRODES IMPLANTED INTO THE SUBTHALAMIC NUCLEUS FOR THE TREATMENT OF PARKINSON'S DISEASE

2009 ◽  
Vol 64 (suppl_5) ◽  
pp. ons374-ons384 ◽  
Author(s):  
Slawomir Daniluk ◽  
Keith G. Davies ◽  
Peter Novak ◽  
Thai Vu ◽  
Jules M. Nazzaro ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Deep Brain Stimulation ◽  
Magnetic Resonance ◽  
Subthalamic Nucleus ◽  
Brain Stimulation ◽  
Related Factor ◽  
Technical Error ◽  
Resonance Imaging ◽  
Computed Tomographic ◽  
Deep Brain

Abstract OBJECTIVE Although a few studies have quantified errors in the implantation of deep brain stimulation electrodes into the subthalamic nucleus (STN), a significant trend in error direction has not been reported. We have previously found that an error in axial plane, which is of most concern because it cannot be compensated for during deep brain stimulation programming, had a posteromedial trend. We hypothesized that this trend results from a predominance of a directionally oriented error factor of brain origin. Accordingly, elimination of nonbrain (technical) error factors could augment this trend. Thus, implantation accuracy could be improved by anterolateral compensation during target planning. METHODS Surgical technique was revised to minimize technical error factors. During 22 implantations, targets were selected on axial magnetic resonance imaging scans up to 1.5 mm anterolateral from the STN center. Using fusion of postoperative computed tomographic and preoperative magnetic resonance imaging scans, implantation errors in the axial plane were obtained and compared with distances from the lead to the STN to evaluate the benefit of anterolateral compensation. RESULTS Twenty errors and the mean error had a posteromedial direction. The average distances from the lead to the target and to the STN were 1.7 mm (range, 0.8–3.1 mm) and 1.1 mm (range, 0.1–1.9 mm), respectively. The difference between the 2 distances was significant (paired t test, P < 0.0001). The lower parts of the lead were consistently bent in the posteromedial direction on postoperative scout computed tomographic scans, suggesting that a brain-related factor is responsible for the reported error. CONCLUSION Elimination of the technical factors of error during STN deep brain stimulation implantation can result in a consistent posteromedial error. Implantation accuracy may be improved by compensation for this error in advance.

scholarly journals Implanted deep brain stimulator and 1.0-Tesla magnetic resonance imaging

2006 ◽  
Vol 24 (6) ◽  
pp. 1409-1412 ◽  
Author(s):  
Norbert Kovacs ◽  
Ferenc Nagy ◽  
Ferenc Kover ◽  
Adam Feldmann ◽  
Carlos Llumiguano ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Resonance Imaging ◽  
Deep Brain Stimulator ◽  
Deep Brain

Transient splenial lesion of corpus callosum: A window to many diagnoses

2021 ◽  
Vol 12 (3) ◽  
pp. 114-120
Author(s):  
Fathima Hana Maqsood ◽  
Adarsh Kibballi Madhukeshwar ◽  
Abdul Rasheed Valiyapalathingal ◽  
Vinayaka U.S ◽  
Devadas Acharya ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Corpus Callosum ◽  
Frequent Occurrence ◽  
Resonance Imaging ◽  
Time Intervals ◽  
3T Mri ◽  
Splenial Lesion ◽  
Clinical Conditions

Transient splenial lesions (TSL) are not of frequent occurrence and are usually observed with other diseases. The mechanism of TSL development still unclear despite of various theories put forward. These are secondary lesions and their diagnosis is of importance to associate them with clinical conditions. Magnetic resonance imaging is the modality of diagnosing TSL and 3T MRI was used in this study. The study includes 10 cases of TSL with varied disease etiologies like migraine, trauma, infection, demyelination etc. All the cases had follow-up imaging which showed resolution of the lesions after varied time intervals. An attempt to correlate the various theories with each type of disease is done in this study.

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