medical ultrasound equipment performance …performance testing of medical ultrasound equipment...
TRANSCRIPT
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Performance Testing Of Medical Ultrasound Equipment
James A. ZagzebskiDepts. of Medical Physics, Radiology,
and Human Oncology
University of Wisconsin, Madison, WI
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Should we do routine performance testing in ultrasound?
Some say “It is not beneficial.”
Others believe there is not sufficient manpower, especially in physics and bme.
Phantoms are perceived to be expensive and inadequate.
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Routine performance testing …
No established performance standards.Geometry, no problem; image quality is!
Lack of correlation between performance parameters and clinical performance.
Imaging is simple; specifying performance is complex.
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ContentsReview characteristics of equipment
Discuss factors related to physicists measurements of imaging performance
Recommend basic QA
Discuss role of medical physicists
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Real-time imaging
JAZ tongue30 frames/s
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Signal Processing
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Harmonic Processing
Acousticfield
Afterprocessing
Tran
sduc
er
Tissue
Tran
sduc
er
Tissue
Frequency
Frequency
f1
f2
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Gallbladder Polyp
Fundamental Harmonic
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Amplify
CodedTransmit
Tx
Amplify
Transmit
Tx
Decode
Coded Excitation
Standard
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GE 548cStandard Transmit
GE 548cCoded Excitation
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GE Logiq 700Horizontal spacing: 2 mm, 1 mm, 0.5 mm, 0.25 mmVertical Spacing: 2 mm, 1 mm, 0.5 mm, 0.25 mm
4 MHz12 MHz
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Multiple Transmit Focal Zones
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DF.R.L x λ=
F = focal distanceD = aperture (transducer) sizeλ = wavelength
(smaller for higher frequencies)
F = focal distanceD = aperture (transducer) sizeλ = wavelength
(smaller for higher frequencies)
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Point targets in tm material
GE C548transducer
4 MHz 7 MHZ
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ConventionalTransducer
4 mm targets
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Important Performance Features
Geometric accuracy(Not at levels considered previously when static scanners were used)
Resolution
Uniformity
Penetration and sensitivity
Low contrast detection
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Common US phantoms
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Gel Phantom Material Properties
FairWater-likeB/A
GoodLiver likeScatter
Good0.5 to 0.7 dB/cm-MHz
Attenuation
Very Good1,540 m/sSOS
Good103 kg/m3Density
Degree of ControlValueProperty
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Water-based Gel PhantomsGel materials cannot be machined.
Even little bubbles cause big problems.
Care is needed to avoid desiccation.
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Alternative Materials
Polyurethane rubberstable
SOS = 1455 m/s(Too low)
Attenuation changes too rapidly with freq.
QA tests only?(Goodsitt et al, 1998, Med Physics)
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Vertical Distance Accuracy Horizontal Distance Accuracy
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Prostate Implantphantom
Dots indicate templates forinsertion points.
Targets should align with template.
(Courtesy of CIRS)
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Extended Fields
3-D
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3-D “Egg-Phantom”
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5 4 3 2 1 ½mm
21½¼(mm)
Axial Resolution Targets
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Cautions Regarding Axial Resolution
Discrete target separationScanner performance may fall between target spacing
Window material causes reverberationsOccasionally see double images of a target
Only limited use of quantitationAxial response length (computer or manually)
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Reverberations from Scanning Surface
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Lateral Resolution
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2 3 4
Tubes (vessels)
2mm
4mm
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2mm
4mm
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“Standard Phantom”Attempt (ACR)
P CarsonE BooteT JohnsonA SiebertJ ZagzebskiE Madsen
RMI 408A
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Spherical Mass
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Low Contrast Detection
-1.5 dB -3 dB
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Routine QA ProgramEquipment inspection
Penetration into a phantom
Gray scale photography (workstation monitor)
Image uniformity
Distance measurements (where needed) RMI 403
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InspectionTransducers free of cracks, delaminations
Cables in good shape
Transducers cleaned after each use
Viewing monitors clean
Air filters
Wheels, locks
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Maximum Depth of Visualization
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Photography (gray bar)
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2 3 4
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Photography (SMPTE)
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Image Uniformity (dead elements)
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Role of The Medical Physicist
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Be knowledgeable in functionality of ultrasound equipment.
Be aware of issues related to acoustic output levels.
Help establish QA programs.
Work beyond routine QA measurements.
Role of The Medical Physicist
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Mechanical and Thermal Indices(MI and TI)
1992 (US) Acoustic Output Display Std
Removed application specific intensity limits
Contrast agents (MI)
Research mode (NIH)