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ch.21 Quality Assurance & clinical Environment
Terms in this set (39)
The Routine periodic Evaluation of the US system to guarantee
optimal image quality
-Multiple evaluations of the systems components
-proper equipment operation
-detect gradual changes
-reduce number of repeat scans
-Test under known, defined conditions
-use phantom with measurable characteristics
-image in identical environment
a phantom is an _________ ________, measured rather than a personal opinion
Medical/legal: must for every laboratory(in theory)
it is the duty of a Sonographer to perform _______ _____________.
-perform Q&A routinely
-check cables daily
-electrical continuity check before every endocavitary exam
Devices Used in Q&A:
AIUM 100mm TEST Object- Water-filled Phantom-
***-water-filled tank with pins
**-speed,1540m/s,same as soft tissue
-attenuates far LESS than soft tisse,no gray scale
Tissue Equivalent Phantom -
-****Tank filled gel that mimics soft tissue with pins,mock cycts and masses
-speed 1540m/s, same as soft tissue***
-attenuates same as soft tissue,gray scale
-Used to assess the accuracy of Pulsed Wave, Continuous Wave & Color flow doppler systems
-Vibrating string and moving belt phantoms may be used to evaluate Doppler systems
Doppler phantoms are commercially available, contains
static stimulated vessels as well as dynamic stimulated vessels at a variety of angles
ability to detect low level echoes in the far field
The setting where all pins in the AIUM are displayed
a higher gain than minimum sensitivity.
All other performance measurements are made at this setting
Definition of sensitivity
When the adjustments make changes in display or echo brightness from scarcely visible to fully saturated, sensitivity is being assessed.
Using the series of SHALLOW pins AIUM test object, we find the dead Zone. It is the distance close to the transducer that cannot produce an accurate image on the display.
***an ___ ____ or gel pad eliminates the dead zone from interfering with imaging superficial structures
Range accuracy also called
vertical depth calibration
range accuracy (vertical depth calibration)
using pins in group 'c' the machines ability to display echoes in the proper depth.
If there is an error,it may be due to:
1. machine malfunction or
2. speed of sound in the phantom is not 1.54km/sec
The machines ability to place echoes in proper positions while imaging from different orientations
The machines ability to position echoes in the correct position along a distance perpendicular to the U/S beam.
depth at which the intensity is the highest and the beam is the narrowest
longitudinal resolution -
The smallest distance at which two pins are displayed as two separate echoes is recorded as the longitudinal res (front-to-back, parallel to the beam )
look to see whether the pins are perpendicular to the sound beam
compensation operation or uniformity
Tissue Equivalent Phantom
Scan from top
TGC off= echoes should be displayed with reduced amplitude with increased depth
TGC on= all of the echoes should have the same amplitude,regardless of depth.
Evaluation of diagnostic accuracy- GOLDEN STANDARD
A perfect technique , for example MRI or angiography, that we deem 100% accuarte to which our ultrasound results are compared.
assuming all patients are infectious
avoid direct contact with blood and bodily fluids
patient dignity -
Kindness, humanity and respect are CORE values of medicine
You can provide dignity by providing privacy and interactions which make patient feel _________ ,comfortable and in control.
patients impaired health and older age rendered them
vulnerable to a loss of dignity .
studies the interaction btwn the sonographer , patient and equipment to optimize the well being of the sonogrpaher.
more than ____of sonographers experience pain from musculoskeletal injury related to work.
approximately ___end their career as a result of such injury
professional organization: SDMS,-
Society of Diagnostic Medical Sonographers, professional society, assists in acquisition of data
Federal Agency: OSHA-
Occupational Saftey and Health Administration , regulatory agency
SDMS acquires & reviews -
Ergonomic Devices include-
wrist support braces, transducer design, control panel, and monitor articulation ,chairs,beds,and support cushions
Facility responsibilities -
Develop policies and procedures for ergonomics and sonographer health-standard operating procedures (SOP)
what are the Facility responsibilities?
-keep arm close to body
-***stay close to the patient
-position the systems monitor directly in front of you and at eye level.
-minimize twisting or bending over
-hold the probe using a whole hand grip, rather than just the fingers(pinch grip)
- keep the wrist in a NEUTRAL POSITION
-use proper foot support
****ARM angle less than 30 degrees
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