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Understanding Ultrasound Display Modes
Nov 7, 2024
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Unit 11: Modes in Ultrasound
Introduction to Modes
Ultrasound display modes interpret and display ultrasound information.
Three display modes
discussed:
Amplitude Mode (A Mode)
Brightness Mode (B Mode)
Motion Mode (M Mode)
Understanding each mode requires knowledge of axis variables.
Section 11.1: A Mode (Amplitude Mode)
Purpose
: Displays strength of returning echo.
Appearance
: Spike-like graph.
Tall spikes
: Strong reflectors.
Short spikes
: Weak reflectors.
Flatline
: No reflectors.
Uses
: Primarily in ophthalmology to map eye structures.
Graph Interpretation
:
X-axis
: Time of flight/depth.
Y-axis
: Amplitude.
Analogy
: Resembles a city skyline.
Section 11.2: B Mode (Brightness Mode)
Purpose
: Produces grayscale diagnostic images.
Image Composition
:
Made of scan lines, represented by pixels.
Original B-mode: Pixels on (white) or off (black).
Current systems: Variety of grays.
Graph Interpretation
:
X-axis
: Depth from transducer.
Z-axis
: Brightness, mapped from amplitude using an oscilloscope.
Note
: Depth and brightness intrinsic to understanding.
Section 11.3: M Mode (Motion Mode)
Purpose
: Graphs motion of anatomy over time; useful in cardiac, fetal, and emergency evaluations.
Graph Composition
:
One scan line, mapping motion quickly.
PRF
(Pulse Repetition Frequency) determines sampling rate.
Graph Interpretation
:
Y-axis
: Depth.
X-axis
: Time.
Horizontal Lines
: No motion.
Squiggly Lines
: Presence of motion.
Applications
:
Cardiac: Evaluates ventricle size and movement.
OBGYN: Measures fetal heart rate.
Summary
Recognize mode by image and axis representation:
A Mode
: Amplitude (Y-axis), Depth (X-axis).
B Mode
: Depth (X-axis), Brightness (Z-axis).
M Mode
: Depth (Y-axis), Time (X-axis).
Complete activities and review questions in the workbook for self-assessment.
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