Does seem like advertising “rack and pinion” steering on a car…

The term is "physics based model" it has somewhat specific meaning in context of mathemtical/physics modelling. It has nothing to do with all physics required to make MRI work. A model doesnt have to be based on physics to be usefull. You can often get some recognizable image by dumb stronger signal=> brighter pixel logic without fully modelling how why it changes. As long as change in material correlates with change in signal (doesn't even have to happen uniformly) you can get some picture and leave the interpretation to human. A simpler example would be temperature control. You can have simple hysteresis based approch of temperature under threshold turn on heater, above threshold turn off. Or you can have physics based model of what the heating power is, what's the heat capacity of chamber, what's the heat capacity of object, how the temperature diffuses within object, what's the thermal resistance of interfaces between heater, target and temperature sensor. Many everyday systems systems are controlled by generic PID controllers without physically modelling how exactly the process reacts to input, PID can be be considered a mathematical control model with sufficient parameterization to approximate various physical systems. You could also make an AI based model and create a signal processing function that way. For many drones PID coefficients are tuned by hand, it was quite a surprise when one of controller manufacurers had made a physics based model to calculate suitable defaults based on drone mass, momment of inertia and maximum thrust.

Technically the tittle isn't lying. Researchers created new physics based model which is more detailed and makes less simplifications compared to old physics based model. The qualification also clarifies that potentially sharper image won't be achieved by new device model or a picture of 3d model printed on marketing materials.

thanks

Getting one on Monday, have a slight cold and took liposomal vitamin c just hours ago!

Thanks for making me aware!

I thought I read that in general it’s just better to decline contrast because it doesn’t actually add value to the scan.

not only vitamin c but fruits containing oxalic acid if I read that right. But I'm far more interested in when such contrast agents are warranted, because I'm not aware that in Europe that contrast agent would be used that much for MRI

I have one planned soon. Of course the prescribing doctor didn't mention any of this, but I guess the research is still too fresh. Thanks for raising awareness.

*If your scan involves contrast agent, which many do not

My late grandfather had a severe reaction to contrast agent while getting an MRI and coded while in the machine. (They resuscitated him)

Many variants seem to be banned in Europe [1]

[1] https://mblynchfirm.com/pharmaceutical-litigation/gadolinium...

I think the source code is here? https://github.com/pinheirothiagoj/NMR_Molecular_Eigenmodes_...

Weird that I couldn't find the paper on arXiv: in my field I just google the title prefixed with "arXiv" and it pops up.

Some earlier articles by the same authors are there though (e.g. https://arxiv.org/abs/2310.06106), does the journal of chemical physics prohibit arXiv posting or is the norm just different in that field?

Indeed. Martin's a great name in the field -- the thing that has actually made most clinical proton MRI substantially better over the last twenty years has been parallel imaging (acquiring the magnetic resonance signal from different spatially separated devices known as RF coils) and associated reconstruction techniques such as compressed sensing.

Given the fact that macrocyclic gadolinium complexes accumulate in the brain and the linear ones dechelate I think very few companies are pursuing new agents. I've done some work with different ions (like Dy, which has Curie paramagnetism) but a lot of focus in the field is trying to find alternatives to gad and reduce its use. There are plenty of great ways of getting more info out of a machine that spans quantum mechanics to medicine, from the established but now actually useful and routine (like advanced diffusion models) to the sort of utterly mad techniques I work on... [0]

[0] https://www.science.org/doi/10.1126/sciadv.adz4334

> discreet calculation

why do they have to be discreet about doing some math? who is going to be bothered by it?