The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
George J Dohrmann - One of the best experts on this subject based on the ideXlab platform.
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a Frameless Stereotactic approach to neurosurgical planning based on retrospective patient image registration technical note
Journal of Neurosurgery, 1993Co-Authors: Kim K Tan, Robert Grzeszczuk, David N Levin, Charles A Pelizzari, George T Y Chen, Robert K Erickson, Douglas L Johnson, George J DohrmannAbstract:✓ A Frameless Stereotactic Device interfacing an electromagnetic three-dimensional (3-D) digitizer to a computer workstation is described. The patient-image coordinate transformation was found by retrospectively registering a digitizer-derived model of the patient's scalp with a magnetic resonance (MR) imaging-derived model of the same surface. This procedure was performed with routine imaging data, eliminating the need to obtain special-purpose MR images with fiducial markers in place. After patient-image fusion was achieved, a hand-held digitizing stylus was moved over the scalp and tracked in real time on cross-sectional and 3-D brain images on the computer screen. This Device was used for presurgical localization of lesions in 10 patients with meningeal and superficial brain tumors. The results suggest that the system is accurate enough (typical error range 3 to 8 mm) to enable the surgeon to reduce the craniotomy to one-half the size advisable with conventional qualitative presurgical planning.
Joachim-michael Gilsbach - One of the best experts on this subject based on the ideXlab platform.
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Frameless Stereotactically guided catheter placement and fibrinolytic therapy for spontaneous intracerebral hematomas technical aspects and initial clinical results
Minimally Invasive Neurosurgery, 2000Co-Authors: Veit Rohde, Ina Rohde, L. Mayfrank, Marcus H T Reinges, Joachim-michael GilsbachAbstract:OBJECTIVE: Frame-based Stereotactic puncture and catheter placement followed by fibrinolytic therapy and drainage is one treatment option in the management of spontaneous intracerebral hemorrhage (sICH). This minimally invasive procedure could even be simplified by Frameless stereotaxy. The authors present their experiences with Frameless Stereotactic image-guided catheter placement for lysis and drainage of sICH, with emphasis on technical aspects. METHOD: In 27 patients with sICH, an infrared-based Frameless Stereotactic Device was used for selecting trajectory and target point of hematoma drainage. A trajectory along the main axis of the hematoma was considered to be optimal for fibrinolytic therapy. An articulated arm served to maintain the predetermined trajectory during surgery and to guide catheter advancement. Clot lysis with recombinant tissue plasminogen activator (rt-PA) was initiated after radiological confirmation of correct catheter positioning. RESULTS: In all cases, selection of the optimal trajectory was not restricted by the Frameless Stereotactic Device. In 25 of the 27 patients, the catheter was placed accurately along the predetermined trajectory into the target point. In two patients, the catheter was positioned at the lateral margin of the hematoma, excluding fibrinolytic therapy in one case. In 24 of 27 patients, the mean hematoma volume could be reduced from initially 52 ml to 17 ml in an average of two days. Hematoma enlargement following rt-PA injection was observed in two patients. Further complications were culture negative pleocytosis of cerebrospinal fluid in two and meningitis in one patient. CONCLUSION: Hematoma puncture and catheter placement for fibrinolytic therapy could be achieved with high accuracy and safety using Frameless stereotaxy. This method allows unrestricted trajectory selection with catheter positioning along the main hematoma axis. Further studies are required to investigate if Frameless Stereotactic puncture and clot lysis could contribute to improve the outcome of patients with sICH.
Kim K Tan - One of the best experts on this subject based on the ideXlab platform.
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a Frameless Stereotactic approach to neurosurgical planning based on retrospective patient image registration technical note
Journal of Neurosurgery, 1993Co-Authors: Kim K Tan, Robert Grzeszczuk, David N Levin, Charles A Pelizzari, George T Y Chen, Robert K Erickson, Douglas L Johnson, George J DohrmannAbstract:✓ A Frameless Stereotactic Device interfacing an electromagnetic three-dimensional (3-D) digitizer to a computer workstation is described. The patient-image coordinate transformation was found by retrospectively registering a digitizer-derived model of the patient's scalp with a magnetic resonance (MR) imaging-derived model of the same surface. This procedure was performed with routine imaging data, eliminating the need to obtain special-purpose MR images with fiducial markers in place. After patient-image fusion was achieved, a hand-held digitizing stylus was moved over the scalp and tracked in real time on cross-sectional and 3-D brain images on the computer screen. This Device was used for presurgical localization of lesions in 10 patients with meningeal and superficial brain tumors. The results suggest that the system is accurate enough (typical error range 3 to 8 mm) to enable the surgeon to reduce the craniotomy to one-half the size advisable with conventional qualitative presurgical planning.
Veit Rohde - One of the best experts on this subject based on the ideXlab platform.
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Frameless Stereotactically guided catheter placement and fibrinolytic therapy for spontaneous intracerebral hematomas technical aspects and initial clinical results
Minimally Invasive Neurosurgery, 2000Co-Authors: Veit Rohde, Ina Rohde, L. Mayfrank, Marcus H T Reinges, Joachim-michael GilsbachAbstract:OBJECTIVE: Frame-based Stereotactic puncture and catheter placement followed by fibrinolytic therapy and drainage is one treatment option in the management of spontaneous intracerebral hemorrhage (sICH). This minimally invasive procedure could even be simplified by Frameless stereotaxy. The authors present their experiences with Frameless Stereotactic image-guided catheter placement for lysis and drainage of sICH, with emphasis on technical aspects. METHOD: In 27 patients with sICH, an infrared-based Frameless Stereotactic Device was used for selecting trajectory and target point of hematoma drainage. A trajectory along the main axis of the hematoma was considered to be optimal for fibrinolytic therapy. An articulated arm served to maintain the predetermined trajectory during surgery and to guide catheter advancement. Clot lysis with recombinant tissue plasminogen activator (rt-PA) was initiated after radiological confirmation of correct catheter positioning. RESULTS: In all cases, selection of the optimal trajectory was not restricted by the Frameless Stereotactic Device. In 25 of the 27 patients, the catheter was placed accurately along the predetermined trajectory into the target point. In two patients, the catheter was positioned at the lateral margin of the hematoma, excluding fibrinolytic therapy in one case. In 24 of 27 patients, the mean hematoma volume could be reduced from initially 52 ml to 17 ml in an average of two days. Hematoma enlargement following rt-PA injection was observed in two patients. Further complications were culture negative pleocytosis of cerebrospinal fluid in two and meningitis in one patient. CONCLUSION: Hematoma puncture and catheter placement for fibrinolytic therapy could be achieved with high accuracy and safety using Frameless stereotaxy. This method allows unrestricted trajectory selection with catheter positioning along the main hematoma axis. Further studies are required to investigate if Frameless Stereotactic puncture and clot lysis could contribute to improve the outcome of patients with sICH.
Douglas L Johnson - One of the best experts on this subject based on the ideXlab platform.
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a Frameless Stereotactic approach to neurosurgical planning based on retrospective patient image registration technical note
Journal of Neurosurgery, 1993Co-Authors: Kim K Tan, Robert Grzeszczuk, David N Levin, Charles A Pelizzari, George T Y Chen, Robert K Erickson, Douglas L Johnson, George J DohrmannAbstract:✓ A Frameless Stereotactic Device interfacing an electromagnetic three-dimensional (3-D) digitizer to a computer workstation is described. The patient-image coordinate transformation was found by retrospectively registering a digitizer-derived model of the patient's scalp with a magnetic resonance (MR) imaging-derived model of the same surface. This procedure was performed with routine imaging data, eliminating the need to obtain special-purpose MR images with fiducial markers in place. After patient-image fusion was achieved, a hand-held digitizing stylus was moved over the scalp and tracked in real time on cross-sectional and 3-D brain images on the computer screen. This Device was used for presurgical localization of lesions in 10 patients with meningeal and superficial brain tumors. The results suggest that the system is accurate enough (typical error range 3 to 8 mm) to enable the surgeon to reduce the craniotomy to one-half the size advisable with conventional qualitative presurgical planning.
