5 ms·
There can be one effect during diffusion-weighted scanning, which is muscle twitching due to induced depolarization when the gradients are ramped hard. I've had
by ihnorton 11y ago
There can be one effect during diffusion-weighted scanning, which is muscle twitching due to induced depolarization when the gradients are ramped hard. I've had that happen a few times and it was a fairly weird sensation, but not discomforting enough for me to stop the scan. No long-term issues that I'm aware of though.
- ska 11y agoThis is called peripheral nerve stimulation (PNS), and isn't specific to EPI (e.g diffusion scans). This That's fair though, I really should have been more specific: You can certainly harm a human being with the piece of machinery known as an MR scanner. Much more so than just PNS, you are dumping energy into the body via RF, so there is a specific absorption rate (SAR) limit applied to avoid going into ranges that will damage tissue. What I was refering to was limited only to the effect of exposure to fixed magnetic fields in an MR, and gradients and RF coils as they are constrained for clinical use.
- russpoldrack 11y agoI had peripheral nerve stimulation nearly every time I did the diffusion weighted scans, but for me too it wasn't bad enough to stop the scan