An integrated head-holder/Coil for intraoperative MRI in open neurosurgery

Staubert, Andreas; Pastyr, O.; Echner, Gernod; Oppelt, A; Vetter, Theodor; Schlegel, Wolfgang; Bonsanto, Matteo M.; Tronnier, V.; Kunze, Stefan; Wirtz, Christian Rainer

doi:10.1002/(sici)1522-2586(200005)11:5<564::aid-jmri13>3.0.co;2-n

Cited by 16 publications

(4 citation statements)

References 4 publications

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“…The expected lower sensitivity characteristics of the head-holder coil compared to the diagnostic QD head coil in all the directions results from the single solenoid nature of the former. A decrease of the coil sensitivity of about 33 % 75 mm cranially from its center along the z-axis, which was found in the present study, corresponds to the data reported by Staubert et al [18] . The asymmetric sensitivity profi le in the y-axis seems attributable to the coil ' s ellipsoidal shape, but did not result in a reduction of quality of the intraoperative images.…”

Section: Discussionsupporting

confidence: 93%

Intraoperative Diffusion-Weighted Imaging for Visualization of the Pyramidal Tracts. Part I: Pre-Clinical Validation of the Scanning Protocol

Ozawa¹,

Muragakı²,

Nakamura³

et al. 2008

Minim Invasive Neurosurg

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Integration of intraoperative diffusion-weighted imaging (iDWI) into neuronavigation can be potentially useful for identification of the pyramidal tract during surgery for parenchymal brain lesions. The technique of iDWI using an intraoperative MR scanner of low magnetic field strength (0.3 Tesla) has been developed. For image acquisition, a specially designed solenoid radiofrequency receiver coil integrated with a modified Sugita head holder (head-holder coil) was used. While the sensitivity characteristics of the head-holder coil were found to be 29% lower compared to a diagnostic quadrature head coil, they were sufficient to obtain iDWI images of good quality. The relationship between the angle of the motion probe gradient (MPG) pulse to the vertical axis and pyramidal tract contrasting were examined in 4 healthy men with a mean age of 30+/-5.7 years. The contrast ratio reached a maximum when the MPG pulse was applied exactly in the anteroposterior direction. The difference of the contrast ratio between right and left sides was not statistically significant. Pyramidal tract visualization became worse and the contrast ratio was reduced when the MPG pulse was applied at different angles to the vertical axis; the reduction rate varied from 20.1 to 27.9% for each 15 degrees of rotation irrespective of its side. In conclusion, the developed scanning protocol for iDWI using an originally designed head-holder coil allowed effective visualization of the pyramidal tracts using an intraoperative MR scanner of low magnetic field strength.

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Section: Discussionsupporting

confidence: 93%

Intraoperative Diffusion-Weighted Imaging for Visualization of the Pyramidal Tracts. Part I: Pre-Clinical Validation of the Scanning Protocol

Ozawa¹,

Muragakı²,

Nakamura³

et al. 2008

Minim Invasive Neurosurg

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show abstract

“…Integration of the coil into the head-holder is a pertinent solution for imagers having a vertical main field. These devices have a separable upper part to enhance surgical exposure (66,76). In an earlier design, the coil had two separable parts, but it was not integrated into the head-holder (68,78).…”

Section: Rf Coils For Intraoperative Usementioning

confidence: 99%

Intraoperative magnetic resonance imaging in neurosurgery

2007

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Intraoperatively magnetic resonance (MR)-guided neurosurgical operations have been done since 1996, mostly for brain tumors. Several different concepts for intraoperative MRI procedures using low-, middle-, and high-field MR scanners have been reported from pioneering neurosurgical centers. In this article, we present the different solutions used in these centers from a practical point of view. More thoroughly, we present our own concept and experience of 160 craniotomies since 1999 in an operation theater equipped with a low-field (0.23T) scanner, which can be turned on and off during surgery.

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“…In the meantime, Staubert et al have solved these problems, developing a surface coil which is integrated in an MR-compatible head holder [41]. The external factors causing artifacts range from anesthesia devices to the overall electrical environment.…”

Section: Problems Of Intraoperative Mr Imagingmentioning

confidence: 99%

Low-field magnetic resonance imaging for intraoperative use in neurosurgery: a 5-year experience

et al. 2002

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The aim of this study was to evaluate the feasibility and point out the indications of intraoperative MR imaging in neurosurgical procedures. The MR imaging was performed using a 0.2-T scanner which was located in a radiofrequencyshielded operating theater. Three major setups for intraoperative imaging were possible: inside the scanner; at the 5-Gauss line; or in an adjacent operating theater. Additionally, in lesions adjacent to eloquent brain areas microscope-and pointer-based neuronavigation with integrated functional data was applied. Three hundred ten patients were investigated in the previous 5 years, among them gliomas (n=95), pituitary tumors (n=81), and 39 non-lesional cases in whom resective or disconnective epilepsy surgery was carried out. We did not observe any adverse effects due to intraoperative MR im-aging. Image quality was sufficient to evaluate the extent of the tumor resection in the majority of cases. The main indications for intraoperative MR imaging were the evaluation of the extent of a resection in glioma, ventricular tumor, pituitary tumor, and in epilepsy surgery. Intraoperative MR imaging offers the possibility of further tumor removal during the same surgical procedure in case of tumor remnants, increasing the rate of complete tumor removal. Furthermore, the effects of brain shift, which would lead to inaccurate neuronavigation, can be compensated for by an update of the neuronavigation system with intraoperative MR image data.

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An integrated head-holder/Coil for intraoperative MRI in open neurosurgery

Cited by 16 publications

References 4 publications

Intraoperative Diffusion-Weighted Imaging for Visualization of the Pyramidal Tracts. Part I: Pre-Clinical Validation of the Scanning Protocol

Intraoperative Diffusion-Weighted Imaging for Visualization of the Pyramidal Tracts. Part I: Pre-Clinical Validation of the Scanning Protocol

Intraoperative magnetic resonance imaging in neurosurgery

Low-field magnetic resonance imaging for intraoperative use in neurosurgery: a 5-year experience

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