MULTI-MODALITY IMAGE REGISTRATION FOR SUBDURAL ELECTRODE LOCALIZATION

2014 ◽  
Vol 26 (05) ◽  
pp. 1450051
Author(s):  
Shuo Dong ◽  
Yuan Liu ◽  
Lixin Cai ◽  
Mei Bai ◽  
Hanmin Yan
Keyword(s):  
Image Registration ◽  
Intractable Epilepsy ◽  
Rigid Registration ◽  
Multimodal Image Registration ◽  
Subdural Electrodes ◽  
Subdural Electrode ◽  
Information Metric ◽  
Electrode Localization ◽  
Image Pairs

Surgical treatment has been proved to be an effective way to control seizures for some kinds of intractable epilepsy. The electrocorticogram (ECoG) recorded from subdural electrodes has become an important technique for defining epileptogenic zones before surgery in clinical practice. The exact location of subdural electrodes has to be determined to establish the connection between electrodes and epileptogenic zones. Artifacts caused by the electrodes can severely affect the quality of CT imaging and sequentially image registration. In this paper, we discussed the performance of mean squares and the Mattes mutual information metric methods in multimodal image registration for subdural electrode localization. Since the skull can be regarded as a rigid body, rigid registration is sufficient for the purpose of subdural electrode localization. The vital parameter for the rigid registration is rotation. The translation result depends on the result of rotation. Both the methods performed well in the determination of the rotation center. Rotation angles of different image pairs of the same volume pair fluctuated a lot. Based on the image acquisition process, we assume that the images within the same volume pair should have the same transformation parameters for registration. Results show that the mean rotation angles of images within one dataset are approximate to the manual results that are considered to be the actual result for registration despite their fluctuation range.

Fibrin sealant to prevent subdural electrode migration during intracranial electroencephalographic monitoring in a patient with a large arachnoid cyst

2014 ◽  
Vol 14 (1) ◽  
pp. 115-119 ◽  
Author(s):  
Alastair T. Hoyt ◽  
Peter S. LaViolette ◽  
Sean M. Lew
Keyword(s):  
Arachnoid Cyst ◽  
Fibrin Sealant ◽  
Intractable Epilepsy ◽  
Cortical Surface ◽  
Technical Challenge ◽  
Stable Position ◽  
Subdural Electrodes ◽  
Subdural Electrode ◽  
Intracranial Electrode

Ensuring a stable position of intracranial electrode grids with good proximity to the cortical surface can be a technical challenge in patients with complex anomalous cerebral anatomy. This report illustrates the use of fibrin sealant to secure subdural electrodes to concave cortical surfaces during intracranial electroencephalographic monitoring for localization-related medically intractable epilepsy in a patient with a large arachnoid cyst.

scholarly journals Use of an intraventricular strip electrode for mesial temporal monitoring in children with medically intractable epilepsy

2017 ◽  
Vol 19 (4) ◽  
pp. 495-501
Author(s):  
Hyunmi Kim ◽  
Ahyuda Oh ◽  
Larry Olson ◽  
Joshua J. Chern
Keyword(s):  
Intractable Epilepsy ◽  
Median Number ◽  
Seizure Onset ◽  
Strip Electrode ◽  
Subdural Electrodes ◽  
Seizure Onset Zone ◽  
Subdural Electrode ◽  
Temporal Structures ◽  
Seizure Onset Zones

OBJECTIVE The objective of this study was to evaluate mesial temporal electroencephalographic (EEG) monitoring, using an intraventricular strip electrode (IVSE) along the ventricular surface of the hippocampus, in children with medically intractable epilepsy. METHODS The authors reviewed 10 consecutive cases in which subdural electrode placements and mesial temporal monitoring were recommended. The median age of the patients was 12.7 years (range 4.5–19.3 years). Both grids and IVSE were placed in all patients. The 4-contact IVSE was used in 5 cases, and the 6-contact IVSE in the other 5 cases. The median number of contacts, including IVSE contacts, was 122 (range 66–181). A total of 182 seizures were analyzed. RESULTS The IVSE localized seizure-onset zones in 8 patients. The seizure-onset zone was identified exclusively by IVSE in 3 patients and was simultaneous in IVSE and subdural electrodes in 5 patients. Among the 5 patients with simultaneous onset on both IVSE and subdural electrodes, 4 had basal temporal onset and one had orbitofrontal and lateral midtemporal onset. In the remaining 2 patients, the absence of IVSE seizure onset permitted sparing of mesial temporal structures. An Engel Class Ia outcome was achieved in 9 of 10 cases. No complication was associated with IVSE placement. CONCLUSIONS Intracranial monitoring using IVSE offers an alternative in terms of quality of EEG recording. IVSE was useful in children who already required open craniotomy for intracranial monitoring over an extensive network of hyper-excitability.

scholarly journals Quality Assurance of Image Registration Using Combinatorial Rigid Registration Optimization (CORRO)

2021 ◽  
Vol 5 (3) ◽  
pp. 01-09
Author(s):  
Afua A. Yorke ◽  
Gary C. McDonald ◽  
David Solis ◽  
Thomas Guerrero
Keyword(s):  
Standard Deviation ◽  
Image Registration ◽  
Joint Entropy ◽  
Image Pair ◽  
Data Set ◽  
Rigid Registration ◽  
Cbct Image ◽  
The Mean ◽  
Image Pairs ◽  
K 12

Purpose: Expert selected landmark points on clinical image pairs to provide a basis for rigid registration validation. Using combinatorial rigid registration optimization (CORRO) provide a statistically characterized reference data set for image registration of the pelvis by estimating optimal registration. Materials ad Methods: Landmarks for each CT/CBCT image pair for 58 cases were identified. From the landmark pairs, combination subsets of k-number of landmark pairs were generated without repeat, forming k-set for k=4, 8, and 12. A rigid registration between the image pairs was computed for each k-combination set (2,000-8,000,000). The mean and standard deviation of the registration were used as final registration for each image pair. Joint entropy was used to validate the output results. Results: An average of 154 (range: 91-212) landmark pairs were selected for each CT/CBCT image pair. The mean standard deviation of the registration output decreased as the k-size increased for all cases. In general, the joint entropy evaluated was found to be lower than results from commercially available software. Of all 58 cases 58.3% of the k=4, 15% of k=8 and 18.3% of k=12 resulted in the better registration using CORRO as compared to 8.3% from a commercial registration software. The minimum joint entropy was determined for one case and found to exist at the estimated registration mean in agreement with the CORRO algorithm. Conclusion: The results demonstrate that CORRO works even in the extreme case of the pelvic anatomy where the CBCT suffers from reduced quality due to increased noise levels. The estimated optimal registration using CORRO was found to be better than commercially available software for all k-sets tested. Additionally, the k-set of 4 resulted in overall best outcomes when compared to k=8 and 12, which is anticipated because k=8 and 12 are more likely to have combinations that affected the accuracy of the registration.

scholarly journals Incorporating Metric Flows and Sparse Jacobian Transformations in ITK

2006 ◽  
Author(s):  
Mathieu De craene ◽  
Aloys Du bois d'aische ◽  
Benoit Macq ◽  
Simon Warfield
Keyword(s):  
Image Registration ◽  
Mutual Information ◽  
Computation Time ◽  
Deformable Registration ◽  
Deformation Field ◽  
Transformation Model ◽  
Rigid Registration ◽  
Information Metric ◽  
Demons Algorithm

Various metrics have been proposed in the literature for performing intrinsic automatic image to image registration. Among these measures, mutual information is a very popular one because of its robustness and accuracy for a wide variety of applications. In this paper, we propose a filter for performing non-rigid registration by estimating a dense deformation field derived from the mutual information metric. This filter takes place in the ITK PDE deformable registration design like the Demons algorithm of Thirion. We also show how the concept of metric flow is conceptually linked to the concept of metric derivative for a prior transformation model by the transformation jacobian. We also suggest a sparse implementation of the GetJacobian() method for reducing the computation time of a metric derivative for local transformations models.

scholarly journals The interactive electrode localization utility: software for automatic sorting and labeling of intracranial subdural electrodes

2016 ◽  
Vol 12 (10) ◽  
pp. 1829-1837 ◽  
Author(s):  
Roan A. LaPlante ◽  
Wei Tang ◽  
Noam Peled ◽  
Deborah I. Vallejo ◽  
Mia Borzello ◽  
...  
Keyword(s):  
Subdural Electrodes ◽  
Automatic Sorting ◽  
Electrode Localization

Noninvasive Determination of Ligament Strain with Deformable Image Registration

2007 ◽  
Vol 35 (7) ◽  
pp. 1175-1187 ◽  
Author(s):  
Nikhil S. Phatak ◽  
Qunli Sun ◽  
Seong-Eun Kim ◽  
Dennis L. Parker ◽  
R. Kent Sanders ◽  
...  
Keyword(s):  
Image Registration ◽  
Deformable Image Registration ◽  
Ligament Strain

United equilibrium optimizer for solving multimodal image registration

2021 ◽  
pp. 107552
Author(s):  
Peng Gui ◽  
Fazhi He ◽  
Bingo Wing-Kuen Ling ◽  
Dengyi Zhang
Keyword(s):  
Image Registration ◽  
Multimodal Image Registration

Interhemispheric Subdural Electrodes: Technique, Utility, and Safety

2013 ◽  
Vol 73 (2) ◽  
pp. ons253-ons260 ◽  
Author(s):  
Tarek Abuelem ◽  
David Elliot Friedman ◽  
Satish Agadi ◽  
Angus A. Wilfong ◽  
Daniel Yoshor
Keyword(s):  
Patient Monitoring ◽  
Intractable Epilepsy ◽  
Mass Effect ◽  
Neurological Deficits ◽  
Epileptic Focus ◽  
Epileptogenic Zone ◽  
Invasive Monitoring ◽  
Cortical Function ◽  
Subdural Electrodes ◽  
Dorsolateral Cortex

Abstract BACKGROUND: Invasive monitoring using subdural electrodes is often valuable for characterizing the anatomic source of seizures in intractable epilepsy. Covering the interhemispheric surface with subdural electrodes represents a particular challenge, with a potentially higher risk of complications than covering the dorsolateral cortex. OBJECTIVE: To better understand the safety and utility of interhemispheric subdural electrodes (IHSE). METHODS: We retrospectively reviewed the charts of 24 patients who underwent implantation of IHSE by a single neurosurgeon from 2003 to 2010. Generous midline exposure, meticulous preservation of veins, and sharp microdissection were used to facilitate safe interhemispheric grid placement under direct visualization. RESULTS: The number of IHSE contacts implanted ranged from 10 to 106 (mean = 39.8) per patient. Monitoring lasted for 5.5 days on average (range, 2-24 days), with an adequate sample of seizures captured in all patients before explantation, and with a low complication rate similar to that reported for grid implantation of the dorsolateral cortex. One patient (of 24) experienced symptomatic mass effect. No other complications clearly related to grid implantation and monitoring, such as clinically evident neurological deficits, infection, hematoma, or infarction, were noted. Among patients implanted with IHSE, monitoring led to a paramedian cortical resection in 67%, a resection in a region not covered by IHSE in 17%, and explantation without resection in 17%. CONCLUSION: When clinical factors suggest the possibility of an epileptic focus at or near the midline, invasive monitoring of the paramedian cortex with interhemispheric grids can be safely used to define the epileptogenic zone and map local cortical function.

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