Ultrasound Physics Chapter 5 | 2025/2026 Q&A | Intensity, Bioeffects, SPTA, Duty Factor | ARDMS, DMS Programs

This document presents a focused and expertly graded A+ study guide for Chapter 5 of “Understanding Ultrasound Physics”, tailored for the 2025/2026 SPI certification cycle. It contains verified questions and answers specifically centered around ultrasound beam intensities and bioeffects, one of the most frequently tested and high-yield topics on the SPI exam. All answers are aligned with current didactic standards and exam expectations. Key topics covered include: Definitions and calculations of intensity (W/cm²) Differences between SPTP, SPPA, SPTA, SATA Concepts of spatial, temporal, peak, average, and pulsed intensity Beam Uniformity Coefficient (SP/SA factor) Duty factor and continuous wave vs. pulsed wave implications Ranking of intensity measurements Relevance of SPTA to tissue heating and bioeffects The Q&A format reinforces core concepts with clarity and precision. This resource is ideal for mastering the language and logic of ultrasound physics, helping students strengthen both memory recall and clinical understanding. Recommended for: Diagnostic Medical Sonography (DMS) students ARDMS SPI exam candidates Ultrasound physics review courses Medical imaging, radiologic technology, and cardiovascular technology students Relevant to programs offered by South College, Washburn University, Oregon Tech, ECPI University, and all CAAHEP-accredited sonography programs. Keywords: ultrasound physics, SPI exam 2025, chapter 5 ultrasound, SPTA intensity, spatial peak, temporal average, pulse average, duty factor, intensity bioeffects, ultrasound safety, beam uniformity, ARDMS physics, sound wave intensity, pulsed vs continuous wave, sonography review, tissue heating