鑑別復發性星狀細胞瘤(recurrent astrocytoma)與放射治療後的腦部壞死(radiation necrosis of brain),最好的檢查是:
電腦斷層(computed tomography, CT)
磁振造影(magnetic resonance imaging, MRI)
正子電腦斷層(positron emission tomography, PET)
單光子電腦斷層(single-photon emission computed tomography, SPECT)