Interactive Physics Companion™ · It's here

Physics can finally make sense.

You've read it over and over and it still won't stick. This isn't another textbook. It's something you actually work through, until it clicks.

$99

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Get the Companion

Instant access on your phone, tablet or laptop. 6 months, and every update along the way.

👋 Already a Premium or Pro student? You've already got this, at no extra cost, right where your lesson notes used to be. Just head to your course, no need to buy anything here.

Sound familiar?

This one's for you.

  • Physics is the class making you wonder if you're even cut out for the program.
  • You've read the same notes over and over and it still won't stay in your head.
  • You're retaking the SPI exam and can't afford to feel lost again.
  • Still diagrams and dense pages just never made it click for you.
  • You don't just want to scrape by. You want to actually understand it.

If any of that sounds like you, you're exactly who this was made for. Try a demo below.

The Interactive Physics Companion
Don't just read the physics. Work through it.
A few real pieces from the lessons. Tap through them, and watch the concept build itself instead of just reading about it.
From the lesson on mechanical transducers
One crystal, swinging to build the image
A mechanical probe has just one crystal. A motor physically swings it back and forth, and each position fires one scan line in a slightly different direction. Tap through and watch the fan build.
The crystal fires once
1 of 21 positions
One position, one direction, one scan line. The crystal is tilted all the way to one side.
Same lesson, testing your thinking
What if that one crystal fails?
Since a mechanical probe has only one crystal doing every job, there is no backup. Before you tap anything, take a guess first.
Guess first
If that one crystal fails, what happens to the image?
One crystal, doing everything
one crystal doing all of it
Every line in that fan came from the same element. It is carrying the whole image on its own.
🎯
EXAM TIP
If a question asks what happens when the PZT fails in a mechanical transducer, it is the whole image, not a band or a patch, because there is only one crystal.
From the lesson on attenuation
When sound meets something tiny
Rayleigh scattering happens when sound meets structures much smaller than the wavelength, like red blood cells. The sound scatters out almost equally in every direction. Tap to watch.
One pulse, heading for a red blood cell
🎯
EXAM TIP
Rayleigh scattering is proportional to frequency to the fourth power, so a small change in frequency makes an enormous change in scattering.
From the lesson on the receiver
Time gain compensation
Deeper echoes travel further, so they come back weaker and the bottom of the image would fade out. This is the control that corrects it, depth by depth. Watch the sliders work.
TGC SLIDERSTHE IMAGE a TGC slider the image at this depth  a TGC slider the image at this depth  a TGC slider the image at this depth  a TGC slider the image at this depth  a TGC slider the image at this depth  a TGC slider the image at this depth  a TGC slider the image at this depth  a TGC slider the image at this depth the imageshallowdeeppush the deeper sliders further and the bottom catches upeach depth gets its own amount, which is the whole point
The sliders run out and back on their own. Watch how much further the lower ones have to travel, and watch the bottom of the picture come up to meet the top.
Before you move on
Check yourself
You are scanning a structure deep in the abdomen and notice the bottom of the image looks darker than the shallow parts. Which control would you use to make the image uniform from top to bottom?
This is how every lesson works
Teach it properly, then hand it to you to work through. A full lesson goes deeper, with the explanations, the memory tricks, the exam tips, and a check yourself at the end.

See what just happened?

That's every lesson.

  • 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.

That took you two minutes. Now imagine 65 lessons of it.

What's inside

The whole thing, start to finish.

Every topic you're tested on, aligned with what the ARDMS SPI, CCI and ARRT actually cover, so nothing catches you off guard.

15modules
65lessons

01

The fundamentals

Foundations of sound, wave parameters, pulsed sound, and how sound interacts with tissue.

02

Transducers & beams

Transducers, sound beams, display modes, and resolution.

03

Imaging & instrumentation

Two-dimensional imaging, instrumentation, image processing, harmonics, and contrast agents.

04

Doppler & hemodynamics

Hemodynamics, spectral, color, and power Doppler, and optimization.

05

Artifacts

What they are, why they happen, and how to tell them apart from real findings.

06

Bioeffects & safety

Bioeffects, ALARA, quality assurance, and professional responsibility.

Swipe to see all six →

Included free · The SPI Exam Simulator

And you'll know if you're ready.

The worst part of exam day isn't the exam. It's walking in not knowing whether you've done enough. So a full mock exam comes with it, and you find out before it counts.

The score report, showing a scaled score and a percentage for every content area

What you get at the end. Where you stand, area by area, and what to do about it.

Sit the real thing

110 questions, two hours on the clock, weighted to the content outline ARDMS publishes right now.

A score you can read

Scaled the way the real report is, with a percentage for every content area, so you can see what's costing you.

Every option explained

Not just the right one. Every wrong answer tells you why it was tempting, which is what stops you picking it again.

We don't just tell you what you got wrong.

You get the explanation, and then you get pointed straight at the lesson that covers it, with the interactive figures that make it click. It is designed to show you where you're weak and then walk you to the thing that fixes it, while there's still time before the real day.

One day it just clicks.

You'll be sitting in a lecture, hear something about attenuation, and realize you already know it. Not that you read it once. That you know it. That's the whole reason this was built the way it was.

$99

One payment · No subscription

Get the Companion

Instant access on any device. 6 months, and every update along the way.

Made by one sonographer, not a big company. I sat these exams, I've spent the last few years teaching this material, and I built every lesson in here myself. If you get in and something isn't working the way it should, email support@techmeoutus.com and you will get sorted out.