Organisation of the Body
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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show | Point Of Care Ultrasound
Used in emergency medicine to rule in/rule out
Used in procedural guidance, diagnostics e.g. cardiovascular, respiratory, obstetrical, gastrointestinal and vascular as well as in monitoring
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The reverse piezoelectric effect | show 🗑
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show | The resistance ultrasonic waves encounter as they pass through tissue
Depends on: density of the tissue, speed of sound wave
Large difference between air and body tissue to a liquid medium is used to reduce the difference and increase resolution
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Direct piezoelectric effect | show 🗑
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show | Proportional to frequency of the beam
Higher frequency does not penetrate as deep so is better for imaging superficial structures - good lateral and axial resolution
Lower frequency can penetrate deeper so are used for abdominal and pelvic scans
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Focal zone | show 🗑
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Axial resolution | show 🗑
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show | Differentiating between object perpendicular to the ultrasound beam
Focal zone
Decreases with depth due to scattering and divergence of the beam
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show | The ability to resolve objects within the height or thickness of the beam
Dependent on the number of PE crystals and their sensitivity
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Anechoic | show 🗑
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Hypoechoic | show 🗑
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show | Structures reflect similar number of soundwaves to surrounding structures
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Hyperechoic | show 🗑
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Homogenous | show 🗑
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Heterogenous | show 🗑
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What are colour dopplers used for | show 🗑
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Doppler shift principle | show 🗑
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show | Increase in frequency
Increase in blood flow velocity
Decrease in angle of insonation
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show | No doppler beam is perpendicular
It must be parallel to direction of flow
45-60 degrees is sufficient
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show | Higher frequency - 5-18 MHz
Depth - less than 5cm
Uses - vascular, MSK, thyroid and breast imaging
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Curvilinear probes | show 🗑
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Phased-array probes | show 🗑
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