Quality Assurance Flashcards
(48 cards)
What is the attenuation coefficient?
1/2 frequency x path length
Expensive and closely matches the clinical experience vs string/belt in a water bath that dont match the clinical experience but are more affordable
Flow vs String/belt Doppler phantoms
The ability to distinguish between 2 objects perpendicular to the beams path
Lateral resolution
Elevational resolution
Looks for areas of non-uniformity in a linear array
Image uniformity
The ability to distinguish 2 objects perpendicular to the beam’s path
Elevational resolution
SPL =
Wavelength x RD
1/2 SPL
Axial resolution
3 other uses for phantoms that are not QA
- Demonstration
- Training
- Research & development
A structure that contains one or more materials that simulate body tissues
Tissue equivalent phantom
Who are the 3 people responsible for QA?
- Physician
- Sonographer
- Service (biomedical and manufacturer)
Dead zone measurement, detailed resolution, distance accuracy, image uniformity, depth of penetration, cyst imaging capabilities
The things phantoms can test for
Dead Zone
PZT Curie temp
350 celsius
Image uniformity
A test for older static B scanners to ensure the positioning is accurate for the reconstructed image
Registration
Testing the system’s ability to detect weak echoes
Sensitivity tests
A form of radiotherapy where a sealed radiation source is placed inside or next to the area requiring treatment
Brachytherapy
A small transducer that produces a voltage proportional to the received acoustic pressure wave for the purposes of measuring output power or intensity
Hydrophone
AIUM 100 benefits
Quite inexpensive but have no grayscale and therefore no attenuation
Responsible for acceptance testing when a machine arrives on site to ensure patient and employee safety
Measuring pins at known distances with calipers and comparing the numbers
Distance accuracy
1540 m/s
Speed of sound in soft tissue
Another name for dead zone
Main bang artifact
