Fig. 1.

Detection of ischemia within the motor system in ioMRI.

The figure shows the diffusion-weighted imaging (DWI) and perfusion-weighted imaging (PWI) sequences as well as the location of the corticospinal tract (orange) as visualized by diffusion tensor imaging fiber tracking (DTI FT) fused with preoperative T1-weighted images with contrast enhancement (T1 ​+ ​CE) of all patients who showed a loss or decline of motor evoked potentials (MEP) during tumor resection. Green circles show that ischemia could be detected by the according sequence. Red circles indicate that ischemia could not be detected. The intervals between the loss or decline of MEPs and the completion of the image is shown for each sequence in minutes (EPI ​= ​echo-planar-imaging, ADC ​= ​apparent diffusion coefficient, TSE ​= ​turbo-spin-echo, PWI ​= ​perfusion-weighted imaging). (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)