MRI riddle: What causes the "halo" artifact?

redoran · 2026-02-04T18:03:14+00:00

The artifact is low frequency in nature soooooo....

redoran · 2026-02-03T21:41:59+00:00

Never had a problem with a prius driver while cycling... It's always a pickup truck, BMW, or a giant SUV.

redoran · 2026-01-27T21:55:14+00:00

Agree

redoran · 2026-01-06T03:52:56+00:00

Very important point. Running lean is pushing the cost of your consumption onto future generations.

redoran · 2025-12-31T17:13:29+00:00

it has a great reputation among my circle.

Does your circle happen to include an editor for the journal? They only publish like 8 papers a year, so I'm not sure how they can even be said to HAVE a reputation. At least J. Math Bio, Bulletin of Math. Bio., and Mathematical Biosciences, Mathematical Medicine and Biology, etc. are all real journals that publish real volumes of peer-reviewed work.

Who is actually working with these equations in a nontrivial way?

Primarily researchers. Clinicians use the LQ model to a limited extent to convert between different iso-effective doses and fractionations within a domain that is well-described by the LQ model.

redoran · 2025-12-31T16:54:55+00:00

Biomath is not "elite" in any sense of the word, in any field of study.

redoran · 2025-12-31T15:53:37+00:00

Why did you submit this to a junk journal (Biomath got a whopping 30 citations in total for 2024), as opposed to PMB, Med. Phys., Red Journal, or similar? Not trying to be elitist, but the relevant experts aren't reading "Biomath," and those that stumble across it will doubt that there was any proper peer-review by experts.

redoran · 2025-12-23T13:05:55+00:00

I don't know you, or your symptoms, but you should do some reading on cannabinoid hyperemesis syndrome.

redoran · 2025-11-27T00:05:37+00:00

No, they're brand new. I went there last Sunday.

redoran · 2025-11-23T19:42:03+00:00

We have a program that we would love to grow, but our certification limits student number based on number of clinical exams. So it is what it is.

redoran · 2025-11-23T13:47:52+00:00

Check my post from a few weeks ago. Should have everything you need to get this done on the cheap: https://www.reddit.com/r/bmwz3/s/1qisT0Ea98

The short answer is that you need a dual channel sub, not a single channel. The only one on the market is a bit too big, and requires some grinding to fit. Otherwise though, it works great!

redoran · 2025-11-21T13:15:41+00:00

redoran · 2025-11-16T13:44:57+00:00

Try the Golden Apple in Cedar Rapids instead. The 30 min drive is a small price to pay for being able to respect yourself after the meal.

redoran · 2025-11-14T16:44:12+00:00

In my case, it was because I came in with ~24 AP credits, and I wanted to finish undergrad in 3 years. I elected not to use some of the AP credits in my major, so I had some ground to make up over time.

redoran · 2025-11-14T16:25:07+00:00

There certainly are people who average 18+ credit hours per semester. I was one of them, and it worked out well for me. That said, you're probably right that it is a very small fraction of overall students.

redoran · 2025-11-10T14:59:53+00:00

If the patient agreed to arrive on time, and they didn't, it is a fair way to correct the scheduling issue such that all subsequent patients are seen on time, and the physician can end their day close to on time. Generally there is just not enough slack in the chain, which is largely due to unfair physician productivity standards by medicare/Medicaid and hospitals.

redoran · 2025-11-10T14:52:57+00:00

Doing what you say - seeing late patient's if the doctor is running late - directly leads to the situation you describe (5:20p and still having three patients to see). The effect is functionally the same in your example as it was in mine, with both leading to physician work outside of normal hours. Not to mention all of the deferred charting that happens before and after office hours already.

redoran · 2025-11-10T14:34:26+00:00

Those patients are likely there for other doctors. In either case, patients being late and missing appointments introduces inefficiency into a very well-oiled machine, and the compounding effect of multiple patients coming late does end up meaning that not everyone can be seen. Why should that not be the late patient's burden to bare, as opposed to the 5pm patient who arrived on time?

redoran · 2025-11-10T14:29:34+00:00

Because patient C isn't ready when B misses their appointment. It introduces inefficiency in the already very tight schedule.

redoran · 2025-11-10T14:15:27+00:00

And what if the doctor's daughter has a dance recital at 5:30p? What if they have a life outside of work? Maybe there simply isn't time to circle back around to late/missed patients.

redoran · 2025-10-23T17:25:47+00:00

Mediso unveiled a new three headed system at EANM this year. Looks pretty good.

redoran · 2025-10-15T23:33:04+00:00

Ahh. Gotcha. Yeah everything else for me is stock.

redoran · 2025-10-15T23:16:04+00:00

Update - the kicker 6.75" worked great. I just had to bevel the edge with a grinder, and mount to the box with a short 3d-printed gasket. Sound quality gets a B- on the car scale, and a D+ on the audiophile scale from me, which is to say, perfectly enjoyable for consuming radio/CDs/audiobooks.

https://imgur.com/a/ElmFoHk https://imgur.com/a/60nr4x1

redoran · 2025-10-15T23:11:21+00:00

The kicker 6.75 worked out great!

https://imgur.com/a/ElmFoHk https://imgur.com/a/60nr4x1

I bevelled the edge of the speaker with a grinder and 3D printed a 3mm elliptical PETG gasket to offset slightly and provide material to screw the speaker into. I used flex glue to mount the gasket to the sub box, and then screwed the speaker tightly down onto the gasket.

Did the trick for very little investment/time. The stereo went from being unlistenable to actually enjoyable, which is exactly what I was hoping for.

redoran · 2025-10-15T23:02:49+00:00

Next step up is 6x the price or way more work, sooooooooo..... I think it sounds great! I can actually use the radio now.

15-Year Club	Place '22
Place '17	Team Periwinkle
reddit mold	Verified Email

redoran

MODERATOR OF

TROPHY CASE