Lesson 1Sound wave fundamentals: frequency, wavelength, propagation, acoustic impedanceIntroduces core sound wave properties relevant to ultrasound imaging, including frequency, wavelength, propagation speed, and acoustic impedance, and explains how these determine reflection, refraction, and transmission at interfaces.
Frequency, period, and clinical rangesWavelength and spatial resolution linksPropagation speed in different tissuesAcoustic impedance and reflectionRefraction and transmission at boundariesIntensity, power, and beam profilesLesson 2Basic troubleshooting: noise, probe contact problems, and cable/instrument checksProvides a structured approach to troubleshooting poor images, including recognizing noise, checking probe contact and gel, inspecting cables and connectors, and identifying when equipment service is required.
Identifying electronic and speckle noiseImproving probe contact and gel useChecking cables, connectors, and portsVerifying presets and default settingsSimple on-the-spot functional testsWhen to escalate to technical serviceLesson 3Doppler basics (overview): color vs spectral Doppler principles and limits for bedside useIntroduces Doppler physics for bedside use, comparing color and spectral Doppler, aliasing and angle dependence, and practical limits in emergency and critical care applications where rapid, focused assessments are needed.
Principles of the Doppler frequency shiftColor Doppler flow mapping and settingsSpectral Doppler waveforms and indicesAngle dependence and aliasing limitationsPractical bedside Doppler applicationsCommon Doppler pitfalls and artifactsLesson 4Transducer types and beam formation: linear, curvilinear, phased-array characteristicsDescribes linear, curvilinear, and phased-array transducers, how beam formation differs among them, and how footprint, frequency, and field of view guide probe selection for vascular, abdominal, cardiac, and lung imaging.
Linear probes and high-resolution imagingCurvilinear probes and abdominal viewsPhased-array probes and cardiac windowsBeam steering, focusing, and apodizationProbe frequency ranges and applicationsSelecting probes for point-of-care examsLesson 5Attenuation and depth: effects of frequency selection on depth and image qualityExplores how ultrasound energy is attenuated with depth, how frequency choice alters penetration and resolution, and how to balance image brightness, noise, and diagnostic detail when scanning superficial versus deep structures.
Mechanisms of attenuation in soft tissueFrequency versus penetration trade-offsFrequency effects on axial and lateral resolutionOptimizing settings for superficial targetsOptimizing settings for deep structuresRecognizing attenuation-related artifactsLesson 6Focusing, focal zones, and near/far field optimizationCovers how focusing and focal zones narrow the beam, improve lateral resolution, and differ in the near and far fields. Emphasizes selecting and positioning focal zones to optimize target structures at varying depths.
Near field, focal zone, and far field basicsElectronic versus fixed focusing methodsEffect of focus on lateral resolutionChoosing number and depth of focal zonesOptimizing focus for superficial targetsOptimizing focus for deep structuresLesson 7Common artifacts: reverberation, shadowing, enhancement, mirror image, comet-tail, A/B-lines, ring-downReviews key ultrasound artifacts, why they occur, and how to recognize and use or avoid them. Emphasizes reverberation, shadowing, enhancement, mirror image, comet-tail, A- and B-lines, and ring-down in point-of-care exams.
Reverberation and multiple reflection patternsAcoustic shadowing and clean versus dirty shadowsPosterior acoustic enhancement mechanismsMirror image and duplication artifactsComet-tail, ring-down, and short-path artifactsA-lines, B-lines, and lung artifact patternsLesson 8Resolution and penetration: axial, lateral, and elevational resolution trade-offsDetails axial, lateral, and elevational resolution, how each depends on pulse length and beam width, and how probe choice, depth, and focusing affect the trade-off between fine detail and adequate penetration in clinical imaging.
Axial resolution and spatial pulse lengthLateral resolution and beam widthElevational resolution and slice thicknessDepth, focusing, and resolution changesProbe selection for optimal resolutionBalancing resolution against penetrationLesson 9Time-gain compensation, overall gain, and dynamic range: purpose and practical adjustmentsExplains how time-gain compensation, overall gain, and dynamic range shape image brightness and contrast. Focuses on practical knobology to correct for depth-related attenuation and to avoid over- or under-gaining structures.
Overall gain and global brightness controlTime-gain compensation curve shapingDynamic range and image contrast controlRecognizing overgain and undergain patternsDepth-specific adjustments during scanningPreset use and manual fine-tuningLesson 10Safety and bioeffects: thermal and mechanical indices, ALARA principle, safe scanning timesOutlines ultrasound safety principles, including thermal and mechanical indices, ALARA, and safe exposure times. Emphasizes practical strategies to minimize risk while maintaining diagnostic image quality in vulnerable patients.
Thermal index meaning and limitationsMechanical index and cavitation riskALARA principle in daily practiceSafe scanning times by patient groupHigh-risk scenarios and mitigationRegulatory guidelines and labeling
