Has anyone passed SPI using only free or cheap materials?
You can find plenty of free PDFs and YouTube lectures covering SPI, and that's genuinely enough to prepare for and pass the exam.
Short Answer
You can find plenty of free PDFs and YouTube lectures covering SPI, and that's genuinely enough to prepare for and pass the exam. That's because ultrasound physics is built on a fixed, already-established set of concepts — like grammar rules — so the material you need to study is the same no matter which source you use. Paying for a resource doesn't get you different or better content for SPI the way it might for Breast or Abdomen, where the material is broader and more detailed, and paid resources can genuinely be higher quality.
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Next step
Check your basics, then find your weak areas
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