Interactive Physics Companion™ · Coming soon

You’ve read it three times. It’s still not sticking.

You need something that lets you work through ultrasound physics, instead of reading it over and over and hoping for the best.

Want to know the second it’s live?

Re-reading feels like studying.

Re-reading your notesRe-reading your notesHow well you think you know itWhat you can actually recall
Working through itWorking through itHow well you think you know itWhat you can actually recall

Reading it again makes it feel familiar, and your brain files familiar under “I know this.” Then someone asks you a question and there’s nothing there.

So we built the opposite.

You see it → You take a guess → You find out why → It sticks

Every lesson makes you do something while it teaches you.

FIVE PIECES, FOUR LESSONS
A few excerpts from real lessons
Each piece below comes from a different lesson. You get the explanation first, then something to do with it. That is the pattern the whole Companion™ runs on, and it is why the physics ends up sticking.
From Lesson 12, why ultrasound uses pulsed sound
A pulsed wave transducer cannot talk and listen at once
Anatomic imaging needs two jobs done: send sound into the body, and catch the echoes coming back. In a pulsed wave transducer the same crystal does both, and it cannot do them at the same moment. While it is transmitting, it is deaf. So it sends a short burst, goes quiet, and listens. That pause is not wasted time, it is the whole reason an image exists. A continuous wave transducer gets around this with two separate crystals, one always transmitting and one always receiving, but with no pauses it cannot tell how deep anything is.
Watch one pulse cycle
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Send it out toward the structure, then bring it back as an echo. That round trip is one full pulse cycle.
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From Lesson 14, pulse repetition period and frequency
Depth decides how long the system waits
Sound has to travel all the way to the structure and all the way back before the next pulse can go out. It is a round trip, not a one way trip. So a deeper structure means the system sits and waits longer before it can transmit again. Almost every relationship in this part of the course falls out of that one sentence.
Change the depth
tissuetransducertransducer  structurestructureshort round trip
Echoes are home fast, so the wait is short
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From Lesson 14, checking yourself
Then you have to recall it
Reading an explanation and being able to use it are two different things, so lessons stop and make you decide. Getting it wrong is not punished here. It is the fastest way to find the exact spot where your thinking slipped.
Imaging depth and waiting time
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From Lesson 15, duty factor
The system barely talks at all
Out of one full cycle, the time the system spends actually transmitting is tiny. Nearly all of it is spent listening, and that is on purpose, because the echoes are what build the picture. The bars below are drawn to scale, which is the only way to really feel the difference.
Compare two cycles
the whole cycletime spent transmittingtransmitting 100% of the time
Never stops transmitting, so it never hears anything back
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From Lesson 13, pulse duration and spatial pulse length
And none of it moves on its own
Here is the part that turns physics from a pile of facts into something you can reason through. Change one setting and several others shift with it, every time, in a direction you can predict. You have not met these four terms yet. Tap anyway and watch them move together.
Follow the whole chain
PERIOD
Shorter
WAVELENGTH
Shorter
PULSE DURATION
Shorter
SPATIAL PULSE LENGTH
Shorter
One change in frequency ripples through all four. Nothing here needs separate memorizing.
That was four lessons in about five minutes
A full lesson goes deeper than this, with the explanations, the memory tricks, the exam tips and a check yourself at the end. Same rhythm the whole way through: teach it properly, then hand it to you.

See what just happened?

  • You guessed before anyone gave you the answer.
  • You found out why, right then and there.
  • You watched it change instead of reading about it.
  • You checked yourself before moving on.

Why it actually sticks.

Retrieval practice

Getting it out of your head is what makes it stick, not putting it in again. So every lesson makes you pull it back out before you move on.

EVERY CHECK-YOURSELF QUESTION

The generation effect

An answer you came up with beats one you were handed, and even a wrong guess helps. So you always call it before the answer shows up.

GUESS FIRST, REVEAL SECOND

Dual coding

Your brain files words and pictures in two separate places. Watching a diagram move while you read the explanation gives you both, so you have two ways back to it.

DIAGRAMS THAT MOVE

Cognitive load

Your brain can only hold a few new things at once, and a packed page overflows it. So each idea gets explained fully and shown before the next one starts.

ONE IDEA AT A TIME

Working through it beats reading it every time. This isn’t another textbook, study guide or PDF. It’s an actual learning experience designed to change the way ultrasound is taught.

Be first in.

The Companion™ is being built lesson by lesson, not rushed out. The list finds out first, and gets in first.