Physics and Knobology
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1 Physics and Knobology Cameron Jones, MD 02/01/2012 SOUND: Series of pressure waves traveling through a medium What is ULTRASOUND Physics Words WAVELENGTH: Distance traveled in one cycle FREQUENCY: number of cycles per sec (Hertz) Diagnostic US: MHz
2 Fancy Words Pulsed Wave Output PIEZOELECTRIC EFFECT: crystals vibrate at a given frequency when an alternating current is applied PULSE-ECHO MODE: signal generation <1% of pulse cycle How it works ATTENUATION: Reduction of intensity and amplitude Absorption: Most common, creates heat Reflection: Echo
3 ATTENUATION: Reduction of intensity and amplitude ALARA As low as reasonably achievable Scattering: non-homogeneous surface Refraction: Different densities No confirmed biological effects on patients or operators have been reported Intensities typical of diagnostic ultrasound Ultrasound Modes Motion Mode B-mode Brightness Mode: Different shades of gray Displays returning echo s along one line of B-mode over time
4 Color Doppler The doppler shift Power Doppler Direction and velocity are color-coded and projected on the B-mode image Does NOT examine flow velocity or direction of flow Pulsed Wave Doppler Transducers (aka: Probes) Increasing frequency improves resolution at the expense of penetration 5-10 MHz Displays spectrum of returned doppler frequencies 2-4 MHz MHz 5-10 MHz
5 Transducer basics Transducer basics Convex Array : Sector Scanning - Resolution becomes poorer at greater depths Phased Array : Flat Head, crystals fire at variable time Transducer basics Transducer Indicator Probe Dot Linear Array
6 Resolution: Ability to delineate between 2 different objects Resolution Axial Resolution: The ability to separate objects linear to the ultrasound beam Lateral Resolution: Ability to separate 2 structures side by side Temporal Resolution: - Frames per second - Higher the frame rate, the less jerky the image Resolution Hyperechoic More echogenic than surrounding tissue Object has lots of echo s, appears brighter Echogenicity
7 Echogenicity Echogenicity Hypoechoic Less echogenic than surrounding tissue Very few echo s, appears darker Anechoic / Echolucent Absence of returning echo s Area is black Probe Position and Image Orientation Image Orientation In relation to probe dot Transverse Longitudinal Coronal / Sagittal Longitudinal Transverse
8 Longitudinal Transverse Head Foot Right Left Depth Shallower Button Basics Coronal (Longitudinal) Deeper
9 Button Basics - Depth Button Basics - Depth Button Basics - Depth Button Basics Gain Strength of returning echoes Amplifier Gain is adjusted differently depending on the machine
10 Goldilocks and the 3 Bears Goldilocks and the 3 Bears Top overgained, Bottom undergained Bottom overgained, Top undergained Goldilocks and the 3 Bears Goldilocks and the 3 Bears Entire field overgained Entire field undergained
11 Goldilocks and the 3 Bears Gain What if I get lost? Make Gain Uniform AUTO GAIN I have messed around with the gain knobs, and now I can t see anything... AUTO GAIN Perfect gain top to bottom Attenuation Artifacts Attenuation Artifacts Shadowing Partial or total reflection of sound Weak or no transmission posterior Shadowing High attenuating tissue leaves an acoustic shadow
12 Attenuation Artifacts Attenuation Artifacts Posterior Enhancement Area behind echoweak or echo-free structure appears brighter Posterior Enhancement Echoes enhanced posteriorly behind low attenuating tissue Attenuation Artifacts Edge Artifact aka Side Lobe Sound waves are scattered when they encounter cystic wall or curved surface Attenuation Artifacts Edge Artifact Energy loss
13 Propagation Artifacts Reverberation Sound encounters 2 highly reflective layers Propagation Artifacts Reverberation Recurrent bright arcs at equidistant intervals Sound is bounced back and forth Probe detects a longer traveling time Propagation Artifacts Propagation Artifacts Comet Tail Narrowly spaced reverb very strong reflector Mirror Imaging Sound glances off highly reflective surface (diaphragm) Returning sound waves have longer travel time Misinterpretation of more liver Mirror Liver Diaphragm
14 Mirror Image Mirror Imaging Propagation Artifacts Liver Liver Liver Mirror Diaphragm Mirror Diaphragm Mirror Image Mirror Image Liver Mirror Diaphragm
15 Mirror Imaging Propagation Artifacts Mirror Imaging Liver Liver No Mirror Diaphragm Trouble-Shooting Trouble-Shooting Know your anatomy Define boundaries Choose the proper transducer Learn acoustic windows Go from wider view and zoom in Visualize the anatomy in two planes Maximize system controls - depth/gain/frequency
16 Image Acquisition Tips I am having a hard time finding, do you have any tips? Use more gel! Transducer movements Fan Angle Rotate Translocate / Try a new location (window) Only try one movement at a time Questions?
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