Analyzing 3-tesla magnetic resonance imaging units for implementation in radiosurgery

Mack, Andreas; Wolff, Robert; Scheib, Stefan; Rieker, Marcus; Weltz, Dirk; Mack, G.; Kreiner, Hans-Jürg; Pilatus, Ulrich; Zanella, Friedhelm E.; Böttcher, H.D.; Seifert, Volker

doi:10.3171/jns.2005.102.s_supplement.0158

Cited by 31 publications

(34 citation statements)

References 32 publications

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“…While the latter can provide excellent differentiation between parenchymal tumor and normal brain tissue, its main disadvantage is geometric image distortions caused by nonhomogeneity of the static magnetic field, nonlinearity of the imaging gradients, or eddy currents around the stereotactic frame. Although these can be significantly reduced by the newest efficient magnet shim procedures combined with actively shielded gradient designs, object-induced distortions caused by susceptibility effects at tissue-air interfaces and chemical shift displacement of adipose tissue remain remarkable, especially at magnetic fields of higher strengths [3][4][5] . A study comparing the target position during localization of the subthalamic nucleus based on the data of 1.5-tesla MRI and its real position on the phantom inserted into the stereotactic frame revealed a maximum deviation of 3 mm [11] .…”

Section: Discussionmentioning

confidence: 99%

“…It is well known, however, that CT and MRI have significant inherent limitations, which can negatively influence the accuracy of target localization [3][4][5] . The former usually could not provide precise differentiation of borders of the parenchymal brain lesion, whereas the latter was frequently accompanied by geometric image distortions caused by nonhomogeneity of the static magnetic field, nonlinearity of the imaging gradients, susceptibility effects at tissue-air interfaces and chemical shift displacement, especially at magnetic fields of higher strengths, or eddy currents around the stereotactic frame.…”

Section: Introductionmentioning

confidence: 99%

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New Radiofrequency Coil Integrated with a Stereotactic Frame for Intraoperative MRI-Controlled Stereotactically Guided Brain Surgery

Taniguchi

Muragakı

Iseki

et al. 2006

Stereotact Funct Neurosurg

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Mislocalization errors caused by MR image distortions or brain shift are one of the main causes of complications after stereotactically guided neurosurgical procedures. A special device, which could ameliorate such effects and provide intraoperative acquisition of MR images of sufficient diagnostic accuracy, was developed. It is composed of a radiofrequency receiver coil integrated with a modified Komai stereotactic frame and a Sugita four-pin head holder. Clinical testing revealed that the use of the device during stereotactically guided procedures under the control of low magnetic field strength (0.3 T) intraoperative MRI ameliorates the effects of brain shift, and permits to obtain informative tissue samples and to perform aggressive removal of the lesion without any damage of the eloquent cerebral structures. The possibility of an easy shift from a stereotactically guided to a routine microneurosurgical procedure represents an additional benefit of the developed device.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Radiofrequency Coil Integrated with a Stereotactic Frame for Intraoperative MRI-Controlled Stereotactically Guided Brain Surgery

Taniguchi

Muragakı

Iseki

et al. 2006

Stereotact Funct Neurosurg

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“…Open and low field scanner has some advantages including greater T 1 image contrast, reduced vessel flow, ghost artifacts and the possibility of using patient immobilization devices limited by size in the conventional MRI scanners. Although it has higher system-related distortions which are possible to compensate for, patient-induced distortions are significantly less due to the lower field strength (Krempien RC et al 2003, Mack et al 2005.…”

Section: (B) Manipulation Of Mr Sequencesmentioning

confidence: 99%

“…MRI applications today go beyond TP to other RT processes due to some benefits over other modalities such as superior soft tissue definition, unlimited multi-planar volumetric imaging, physiological and biochemical information using magnetic resonance angiography (MRA) and magnetic resonance spectroscopy (MRS). The recent open and low magnetic field MR simulator (Krempien et al 2003Mack et al 2005 provides easier integration for planning. Ultra-small superparamagnetic iron oxide (USPIO) contrast agents can today be used to evaluate pathological lymph nodes treatment (Weissleder et al 1990).…”

Section: Introductionmentioning

confidence: 99%

Potentials of proton magnetic resonance techniques in Radiotherapy procedures: A review

Aweda¹,

Awojoyogbe²

2011

AJSIR

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The current trend in technological Radiotherapy (RT) developments demands highly precise tumour volume definition and treatment simulation for satisfactory quality management. To achieve this requires sophisticated diagnostic imaging. Magnetic Resonance Imaging (MRI) is systematically emerging to break the monopoly of Computerized Tomography (CT) in treatment planning (TP) procedures by introducing several imaging benefits over CT. Such benefits include improved soft tissue definition, unlimited multi-planar, volumetric imaging, physiological and biochemical information using MR angiography and spectroscopy. Intensity-modulated and adaptive RT techniques may greatly benefit from the functional MRI. New MRI techniques can characterize and quantify different tissue properties and tumour-related changes better than CT. Perfusion MR images represent micro-vascular density and permeability, MR spectroscopy depicts specific metabolites, diffusion-weighted imaging shows tissues at risk and tumour cells while dynamic 3-D acquisition and 4-D images show organ motions and the mobility. The review of these new features, the emerging technological developments of the anatomy of MR Imager and the new contrast materials with a view to using MRI alone for RT treatment planning and other RT procedures form the object of this paper. Literature, internet facilities, relevant documentary and private communications were the sources of the review.

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“…Newer functional imaging techniques (PET scan, fMRI, invasive electrophysiologic studies) have significantly enriched and strengthened our knowledge regarding the topographic anatomy and physiology of the cingulate cortex and its associations [72,73,76,[91][92][93][94] . Additionally, the development of higher-resolution imaging techniques (high-field MRI units, newer pulse sequences) may well increase not only the accuracy of anatomic target localization but also the postoperative visualization of the created lesions.…”

Section: Psychiatric Disordersmentioning

confidence: 99%

Historic Evolution of Open Cingulectomy and Stereotactic Cingulotomy in the Management of Medically Intractable Psychiatric Disorders, Pain and Drug Addiction

Brotis¹,

Kapsalaki

Paterakis³

et al. 2009

Stereotact Funct Neurosurg

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Stereotactic cingulotomy constitutes a psychosurgical procedure nowadays advocated in the treatment of medically intractable obsessive-compulsive disorder, chronic pain and drug addiction. From its theoretical conception to the first cingulectomies performed and modern stereotactic-guided cingulotomies, various target localization methods, different surgical techniques, and numerous lesioning devices have been utilized. In the current article, the authors performed a literature review related to cingular lesion placement in an effort to identify misconceptions of the past, recapitulate existing knowledge and recognize targets for further research. The initial animal and human electrophysiologic experimental data regarding the role of the cingulate cortex in various behavioral and cognitive functions were meticulously reviewed. The clinical indications, surgical technique and the clinical results and complications of open cingulectomies were examined. The anatomic target localization methodologies, surgical technique, and the outcome of the initial stereotactic cingulotomy procedures were reviewed, and the evolution of the imaging techniques, stereotactic devices, and lesioning strategies were followed. The modern advanced surgical techniques, clinical outcome and the procedure-associated complications were analyzed with particular emphasis on the emotional, behavioral, and cognitive procedure-induced changes. Large-scale prospective studies with strict inclusion and well-defined, objective outcome criteria are necessary for defining the role of stereotactic cingulotomy in the current psychosurgical armamentarium.

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Analyzing 3-tesla magnetic resonance imaging units for implementation in radiosurgery

Cited by 31 publications

References 32 publications

New Radiofrequency Coil Integrated with a Stereotactic Frame for Intraoperative MRI-Controlled Stereotactically Guided Brain Surgery

New Radiofrequency Coil Integrated with a Stereotactic Frame for Intraoperative MRI-Controlled Stereotactically Guided Brain Surgery

Potentials of proton magnetic resonance techniques in Radiotherapy procedures: A review

Historic Evolution of Open Cingulectomy and Stereotactic Cingulotomy in the Management of Medically Intractable Psychiatric Disorders, Pain and Drug Addiction

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