CT Perfusion in the Prognostication of Cerebral High Grade Glioma

The CT perfusion scan will be performed on a multi-detector CT scanner at the time of routine preoperative neuronavigation imaging. A non-contrast CT head scan will be acquired to localize the tumour. Four 5 mm thick slices will be selected at the level of the tumour. Multiple images will be acquired at each levels starting 5 sec after the injection of 50 cc of non-ionic iodinated contrast media at a rate of 4 cc/sec. The acquisition parameters will be 80 kVp and 100 mA. The images will be acquired every second for a total of 110 sec. The post- processing will be performed and parameters will be calculated using regions of interest in the areas of tumour showing the highest perfusion values. Another region of interest will be placed in the contralateral normal looking white matter.