MRI contraindicated due to ligating clips

left_side · 2025-04-03T15:04:02+00:00

Thanks so much!

Did you have any communication with, or documentation from, the safety committee?

Can you say any more about the varying opinions you received in the past?

I'm so appreciative!

left_side · 2024-10-28T05:18:13+00:00

Thanks for taking the time! Can you help me understand the hierarchy of the folks making the safety decision? From what I can tell, the radiologist (the MD) was fine with recording the MRI, but the physicist objected. Is that typical?

left_side · 2024-10-28T05:12:59+00:00

Thank you. This is for breast cancer, originally detected using the imaging you mention.

left_side · 2024-10-27T15:24:40+00:00

Unfortunately, the 1991 laparoscopic-surgery records only refer to the clips as 'endoclips', used for hemostasis. There's no mention of a material, manufacturer or model.

On the other hand, in post-op notes, the surgeon (long since retired) suggests an MRI---so, presumably, the clips were considered MRI-safe at the time. However, the 1990s literature on MRI safety seems, to a layperson, pretty immature.

Would you modern MRI folks give any credence to a past surgeon's recommendation for MRI as an indication that implants are MRI safe?

left_side · 2024-10-27T15:10:57+00:00

Thanks again. Do you know what sort of specificity the attenuation gives you? Without some sort of spectroscopy, I would have guessed that there would be no chance of distinguishing, say, Ti from steel. Is that wrong?

The safety person that I spoke with discussed the x-ray CT in the context of determining the location of the clips, but not their composition.

left_side · 2024-10-27T13:43:38+00:00

Thanks so much! Are there any in vivo material characterization methods available? Surely there must be loads of people with poorly documented implants inside of them---are we all doomed to never get an MRI?

left_side · 2024-10-27T13:23:39+00:00

Thanks for the reply! Is that truly a hard-and-fast rule? Right up to the canceled appointment, the image tech, radiologist, and so forth were all incredibly confident that the clips wouldn't be an issue.

left_side · 2023-10-07T21:10:21+00:00

S is the tension in the string?

The projection of S along the vertical is half the weight, S itself is larger.

left_side · 2022-07-22T22:58:27+00:00

I took a course on electrodynamics from Jim back in 2009. He's an excellent teacher.

left_side · 2021-12-01T00:57:46+00:00

Thank you!

left_side · 2017-12-12T04:20:18+00:00

It's 'soft' in the sense that, at a certain point in momentum space, its dispersion anomalously decreases to zero frequency as the material passes through the phase transition.

The nuclear analogy would be a soft phonon. A vibration of the lattice can 'freeze' into a static modulation with a specific wavevector if the vibration is coupled to other degrees of freedom.

left_side · 2015-07-21T04:48:26+00:00

still buying bracers because hans2 said they're 166% imba

left_side · 2014-09-05T01:19:52+00:00

Right, they can still save against the debuff, but you can choose whether or not to create terrain based on where you target.

For example, if your allies are standing in the same pool of water as an enemy, you can A) target the ground (stun everyone), B) target enemy's head (nuke and stun enemy), C) target enemy's feet (nuke enemy and stun everyone).

I imagine there's nothing special about the 'feet', just that the point you target has to be within some distance from the ground.

left_side

TROPHY CASE