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Postimaging brain distortion: magnitude, correlates, and impact on neuronavigation
N L Dorward1, O Alberti, B Velani
1Gough-Cooper Department of Neurological Surgery, Institute of Neurology, London, United Kingdom.
Journal of Neurosurgery
|April 3, 1998
Summary
Brain shifts during surgery are quantified, showing unique patterns for different tumor types. Preoperative imaging can predict these shifts, improving the reliability of neuronavigation systems.
Area of Science:
- Neurosurgery
- Medical Imaging
- Surgical Navigation
Background:
- Intraoperative brain shift is a significant challenge in cranial surgery.
- Accurate neuronavigation relies on precise registration between preoperative images and the actual surgical field.
Purpose of the Study:
- To quantify brain shifts during open cranial surgery.
- To identify correlations between brain shifts and preoperative image characteristics.
- To assess the impact of brain distortion on neuronavigation accuracy.
Main Methods:
- Prospective study of 48 open cranial surgeries.
- Measurement of cortical and deep tumor margin shifts using an image-guidance system.
- Analysis of preoperative imaging for edema, tumor volume, and midline shift.
Main Results:
- Mean cortical shift was 4.6 mm after dural opening and 6.7 mm at completion.
- Significant differences in shift patterns were observed among meningiomas, gliomas, nonglial lesions, and skull base tumors.
- Preoperative edema and lesion depth predicted initial cortical shift, while edema, volume, midline shift, and initial cortical shift predicted deeper shifts.
Conclusions:
- Intraoperative brain distortion is quantifiable and varies by tumor pathology.
- Preoperative imaging features can predict the extent of brain shift.
- Understanding these predictors can enhance the reliability of neuronavigation in neurosurgery.