14 reverse Flashcards
Converts electrical to acoustic energy (transmission) Converts acoustic to electrical energy (reception)
Transducer
Communicates organizes and times the functions
Master Synchronizer
determines the amplitude, PRP, and PRF occurs during transmission creates and controls electrical signal sent to transducer
Pulser
determines the firing, delay patterns for phased array system
Beam Former
transform electrical signals from the transducer into a form suitable for display
Receiver
Monitor
Display
archives the ultrasound studies storage devices include: computer hard drives, CD, DVD, videotape, magneto-optical discs, paper printouts, photographs, and USB
Storage
effects entire image use during transmission can cause exposure/ bioeffects Adjustable
Transducer output
output gain, acoustic power, pulser power, energy output, transmitter output, power or gain
Transducer Synonyms
random and persistent disturbance that obscures or reduces a signal’s clarity
Noise
signal is much stronger than the noise and the image is a high quality
Signal to Noise when high
degrades image strength is closer to strength of the noise
Signal to Noise when low
comparison of the meaningful info (signal) to the amount of contamination (noise)
Signal to Noise
increase
increase output power, signal to noise ratio ______.
inversely
PRP and PRF are what related
Yes
Is PRP adjustable
shorter listening time shorter PRP higher PRF
Shallow Imaging listening time PRP PRF
longer listening time longer PRP lower PRF
Deep Imaging listening time PRP PRF
adjust electrical spikes voltage to reduce love artifacts
Apodization
- Amplification 2. Compensation 3. Compression 4. Demodulation 5. Reject
Order of Receiver Operations
adjustable all signals trated identically entire image gets brighter or darker
Amplification adjustable? singals processed Effects on image
adjustble signals treated differently based on reflector depth image will be uniformly bright from top to bottom
Compensation adjustable? singals processed Effects on image
adjustable signals treated differently depending on strength changes gray scale mapping
Compression adjustable? singals processed Effects on image
not adjustable prepares electrical signals to be suitable for display none
Demodulation adjustable? singals processed Effects on image
adjustable only weak signals affects; strong signals remain unchanged weal echoes appear or are eliminated from image
Reject adjustable? singals processed Effects on image
uses damping material to create short pulses, which provides better axial resolution use only high frequencies
Dynamic Frequency Tuning
As Low As Reasonably Achievable minimizes the patients ultrasound exposure
ALARA
changes brightness of entire image alters signal to noise ratio alters patient exposure bioeffect concerns decrease this first if image is too bright
Output Power vs Receiver Gain Output Power
changes brightness of entire image doesn’t affect signal to noise ratio doesn’t change patient exposure no bio effect concern increase this first if image is too dark
Output Power vs Receiver Gain Receiver Gain
