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Jim Rickner presents:
Verifying Image Quality, How To Use An Ultrasound Phantom
Sponsored by: Conquest Imaging
Wednesday, March 1, 2017, 2:00pm ET PRESENTER: JIM RICKNER, CONQUEST IMAGING
Jim Rickner, Training Director for Conquest Imaging has over 30 years of experience working on a variety of electronic equipment. He is a renowned instructor and sought out speaker in the ultrasound industry, having taught hundreds of biomedical engineers, BMETs, CBETs, and is well respected as a teacher who instructs from a field perspective. His experience includes repairing and operating flight simulators, specialty aircraft avionics, destructive material testing instruments and a variety of ultrasound systems. He has worked for Conquest Imaging over ten years and was the Senior Field Service Engineer
prior to becoming the Training Director. Jim has attended all courses offered at Conquest Imaging for GE, Philips, Siemens, and ATL and has repaired a variety of others.
WEBINAR AGENDA: During this presentation Jim will review poor image quality complaints from the field, describe and illustrate the purpose of the Ultrasound Phantom and discuss multiple test descriptions and procedures using the Phantom in evaluating image quality. Upon completion, the attendee will have an understanding of: 1. The importance the phantom plays in effective evaluation of an ultrasound system's image quality. 2. How to use the phantom to evaluate image quality. 3. The multiple tests that can be performed with the ultrasound phantom.
TechNation would like to thank our sponsor Conquest Imaging!
TechNation would like to thank our sponsor Conquest Imaging! Conquest Imaging is the largest supplier of ultrasound parts, probes/transducers, probe/transducer repair, training, service and free, 24/7 technical support. For more information, visit www.conquestimaging.com
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Slide 1 Verify Image Quality Using an Ultrasound Phantom
Presented by: Jim Rickner, Director of [email protected] Imagingwww.conquestimaging.com
© 2016 Conquest Imaging
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Slide 2
Welcome to “How to Verify Image Quality by Using a Phantom” training presented by Conquest Imaging. After completing this training you will:
Understand Principles of Image Quality
Understand the Relationship Between Frequency and Resolution
Be Familiar with Different Types of Resolution
Understand the Phantom and How it Measures Image Quality
Perform Different Tests to Confirm a Quality Image
Introduction and Welcome
© 2016 Conquest Imaging
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Slide 3
© 2016 Conquest Imaging
Image Quality
What is image quality???
• Image quality problems are amongst the most difficult to solve because of the subjectivity
• What is mushy, grainy, washed out?
• How has it changed over time?
• Has there been degradation over time?
• Customer Interview?
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Slide 4
© 2016 Conquest Imaging
Image Quality
The following parameters influence ultrasound image quality:
Detail/Spatial Resolution: The ability to distinguish small structures (axial and lateral resolution).
Image Uniformity: Comparable detail and contrast throughout the image.
Contrast resolution: The ability to differentiate different tissue types without introducing noise.
Temporal Resolution/Frame rate: The rate to acquire frames and display them.
Dynamic range: Largest and smallest signals acquired and displayed.
Spatial Discrimination: The ability to limit artifacts and reflections from other locations.
Bandwidth: The system ability to reproduce signals appropriately.
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Slide 5
© 2016 Conquest Imaging
Image Resolution
Axial Resolution:
Axial resolution is the minimum separation between two structures the ultrasound beam can distinguish parallel to the beam path.
Axial Resolution
The ability to separate structures parallel to the ultrasound beam
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Slide 6
© 2016 Conquest Imaging
Image Resolution
Would be seen as one structure
Would be seen as two structures
Would be seen as one structure
LateralResolution
Linear Array
Lateral Resolution: Lateral Resolution is the minimum separation from other tissue the ultrasoundbeam can distinguish in a plane perpendicular to the ultrasound beam.
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Slide 7
© 2016 Conquest Imaging
Image Resolution
Would be seen as two structures
Would be seen as one structure
Linear Array
Transverse Resolution
Transverse Resolution: Transverse Resolution is the ability to differentiate structures side by side within the ultrasound beam across the image plane.
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Slide 8
© 2016 Conquest Imaging
Comparable detail and contrast throughout the image
Image should look uniform from top to bottom and left to right.
Image Uniformity
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Slide 9
© 2016 Conquest Imaging
Image Resolution
Contrast Resolution:
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Slide 10
© 2016 Conquest Imaging
The rate to acquire frames and display them.
Frequency will affect.
Number of focal zones will affect
Temporal Resolution/Frame rate
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Slide 11
© 2016 Conquest Imaging
Largest and smallest signals acquired and displayed.
Dynamic range
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Slide 12
© 2016 Conquest Imaging
Phantom TestsThe following tests can help determine if the ultrasound is performing correctly:
Sensitivity/Penetration Testing: The ability to display weak echoes from small objects
Axial/Lateral Resolution: Minimum separation between to closely spaced objects
Contrast resolution: The ability to differentiate different tissue types without introducing noise.
Geometric Accuracy - Vertical: The ability to accurately measure objects using calipers vertically
Geometric Accuracy - Lateral: The ability to accurately measure objects using calipers horizontally
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Slide 13
© 2016 Conquest Imaging
Sensitivity/Penetration Testing
Sensitivity/Penetration Testing:
The ability to display weak echoes from small objects
Extremely important to correctly interpret/diagnose
Max depth is affected by output power, TGC, gain, frequency, focus
Record findings on hard copy
Findings should remain consistent over time
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Slide 14
© 2016 Conquest Imaging
Axial/Lateral Resolution
Axial/Lateral Resolution:
Resolution is the minimum separation between two closely spaced objects which can be
imaged separately
Axial is parallel to the beam
Lateral is perpendicular to beam
Poor resolution means the two objects will appear as one
Hard Copy printouts
Findings should be consistent over time
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Slide 15
© 2016 Conquest Imaging
Contrast Resolution/Displayed Dynamic Range
Contrast resolution
The ability to differentiate different tissue types without introducing noise
Uses the amplitude of the received echoes mapped to a gray scale
Darkest displayed gray equals the least dense material
Lightest display (White) equals the most dense material
Hard copy printouts
Look for degradation over time
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Slide 16
© 2016 Conquest Imaging
Geometric Accuracy
Geometric Accuracy – Vertical/Lateral
Accurate representation is vital for proper diagnosis
Use calipers to measure specific targets printed on the
phantom
Temperature of phantom can drastically change measurements
Vertical distance errors are far less likely to occur than
horizontal
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Slide 17
© 2016 Conquest Imaging
Thank you for attending the training!
Question and Answer
Presented by: Jim Rickner, Director of [email protected] Imagingwww.conquestimaging.com
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