111–120 of 133 posts
Earlier quoted context omitted.
Not to the level of clarity and detail presented here, which is not possible from a basic acoustics physics premise. The “technical blog” is marketing fluff.
that's why I said: "what's new is to use it broadly for imaging"
Even low-dose ultrasound (what they use on pregnant woman) results in ultrastructural changes in brains [0], specifically at the nodes of Ranvier (the gaps between myelin along axons). See also [1] for a review. [0] Ellisman MH, Palmer DE, André MP (1987), "Diagnostic levels of ultrasound may disrupt myelination," Experimental Neurology 98:78–92 https://pubmed.ncbi.nlm.nih.gov/3308504/ [1] Quarato, C.M.I., Lacedonia,…
I thought the whole "we can guess what you're thinking from an MRI" thing was BS, along the lines: take a small set of photos, image people's brains as they are looking at these pictures, to map to some low-dimensional vector of "brain activity". Then show them some of these (in sample!) pictures, measure the vector of activity and predict back what they were looking at. Happy to be corrected. But if that's right the…
1. Yes, that is generally what those studies did. 2. Th studies are not BS, the popular press description of those studies is BS.
I have no biology background, but one ML PoV in-depth description I read of these sounded indistinguishable from BS.
Earlier quoted context omitted.
"MRIs are actually widely available in most cities at reasonable cost" - I live in one of those first-world countries, and our citizens regularly wait many months if not over a year to get a single MRI scan. Yes, it's not just an issue of the MRI but the entire medical system, but the point still stands. Were there machines that were one or more orders of magnitude cheaper and simpler to run - I think we would see a…
Your country has decided to ration MRIs. Here in Australia, it is a one to two day wait for a MRI. Costs 240 AUD, (160 USD ) for a 1.5 Tesla MRI and AUD 400 for a 3 Tesla MRI just up the road. And if I mark the request Urgent, I can send a patient 5 minutes up the road and have it done within the hour. Are you in the UK ? I know that the UK health system has effectively collapsed, due to that country's poverty and ch…
Earlier quoted context omitted.
Your country has decided to ration MRIs. Here in Australia, it is a one to two day wait for a MRI. Costs 240 AUD, (160 USD ) for a 1.5 Tesla MRI and AUD 400 for a 3 Tesla MRI just up the road. And if I mark the request Urgent, I can send a patient 5 minutes up the road and have it done within the hour. Are you in the UK ? I know that the UK health system has effectively collapsed, due to that country's poverty and ch…
As an Australian I've had specialists say improved resolution is leading to over diagnosis and over presentation risks. An argument in the margins and one which loses its force as we learn to interpret finer grained imaging better, do you see this as a valid critique? (The case I last heard of was a future blockage/calcification risk in the carotid which the specialist said was way way too young to act on and would n…
It's a valid point to raise, and a point critical of "boutique" medicine practices specialising in insecurities of the rich.
In a nutshell our flesh is rarely homogenous, more often tarnished by odd blemishes and gnarly growths that often amount to naught.
Experienced work a day doctors appreciate seeing odd lumps earlier but refrain from taking any action until some threshold is crossed "for fear of doing greater harm" - the knives that cut things out, the concoctions that burn things away often come with side effects.
Contrasting that, the Lamborghini doctors actively self promoting their genius on 60 Minutes and other Australian paid journaltising media - they're up for any excuse to charge for an "essential procedure" (pinky promise no failures).
A whole world of reasoning behind evolutionary solutions to explore.
Even low-dose ultrasound (what they use on pregnant woman) results in ultrastructural changes in brains [0], specifically at the nodes of Ranvier (the gaps between myelin along axons). See also [1] for a review. [0] Ellisman MH, Palmer DE, André MP (1987), "Diagnostic levels of ultrasound may disrupt myelination," Experimental Neurology 98:78–92 https://pubmed.ncbi.nlm.nih.gov/3308504/ [1] Quarato, C.M.I., Lacedonia,…
All sound is vibration, so everything is affected by sound at some point as the vibrations propagate through and physically move around materials. Humans can hear because the audible frequency range moves receptors in human inner ears, and as you can imagine this isn't local to the ear, the whole brain will be affected (but biology has accounted for this). If you knock on wood that sound is audible in many frequencie…
is this your conclusion? are there any studies you can link? thanks.