Gammex 403 LE Manuel utilisateur
403 LE
Precision
Multi-Purpose
Phantoms
User’s Guide
2
Table of Contents
Introduction....................................................................................3
Caring for your 403 LE..................................................................4
Scanning the 403 LE.....................................................................5
A Guided Tour of the 403 LE........................................................6
Evaluating the Phantom..................................................................7
Target Specifications..................................................................11
Cystic Targets................................................................................11
Pin Targets....................................................................................11
Resolution Target Groups...................................................................11
Phantom Specifications.............................................................13
Physical Specifications.................................................................13
Tissue Mimicking Background Material........................................13
Low Scatter (Anechoic) Cysts.......................................................13
Harmonic Imaging.......................................................................14
Phantom Desiccation...................................................................15
Charts and Graphs.........................................................................15
Product Warranty.........................................................................16
Sales and Service........................................................................17
3
Introduction
The 403 LE phantom is designed to evaluate the image quality of high resolution
ultrasound systems. The phantom offers carefully placed targets to measure resolution,
depth of penetration, and electronic caliper distance accuracy. Axial resolution pin
spacing patterns are small, offering better axial resolution tests.
Target depths of the phantom extend to 16 cm. This provides a greater ability to test the
resolution capability of the scanner and transducer, as well as electronic caliper
measurement. Pin targets have been included to allow for testing high frequency
transducers that are designed to image the first few centimeters of tissue.
The phantom uses the latest technology in tissue mimicking gel which provides a very
smooth background texture. The composite film scanning surface has been developed
to allow more of the ultrasonic beam to be transmitted and received. The phantom is
fully compatible with the latest tissue harmonics equipment and technology.
Limitations of Use
The 403 LE is designed to be used to aid in the Quality Control testing and monitoring
of ultrasound instruments only. The 403 LE is not to be used to make diagnostic deci-
sions.
4
Caring for your 403 LE
Phantom comes ready to scan. Do not remove surface material.
Store the 403 LE with cover closed securely.
Always attach the scanning surface cover and store the phantom out of direct sunlight
when it is not in use. Store in the plastic bag that is provided or in an air and water-tight
container.
Store the 403 LE at 35º –105ºF (2º–40ºC).
Freezing temperatures will damage the phantom and high temperatures will accelerate
desiccation.
Weigh the 403 LE to monitor desiccation.
Weigh the phantom when you first receive it and then every 6 months after that. Record
the values on the data sheet.
Do not drop or damage the phantom.
Return the phantom for inspection and/or repair if it has been dropped or damaged.
Physical damage to the case will cause premature desiccation.
Gammex recommends annual servicing of your 403 LE to ensure proper operation.
Our qualified service technicians will check for desiccation and provide any needed
rejuvenation, scanning/certification to original specifications, and repairs.
5
Scanning the 403 LE
• Always place the phantom on a stable, level surface for scanning.
•The phantom comes ready to scan. Do not peel off surface material.
• Use water or a generous amount of coupling gel to ensure good transmission. Do
not use mineral oil, baby oil or lanolin-based gels as a coupling medium. Poor
transmission is a result of insufficient coupling.
•Do not press the transducer into the scanning surface. This damages the
scanning surface and will shorten the life of the phantom. For curved
transducers, use water or a thick layer of gel.
• Clean the scanning surface immediately after use. Use a soft cloth or paper towel
and soap and water, if needed.
Caution:
Do not press the tranducer
into the scanning surface.
6
A Guided Tour of the 403 LE
The Tissue Mimicking Phantom 403 LE measures the image quality of ultrasound
scanning systems. The tissue mimicking gel in the 403 LE is ultrasonically similar to
human tissue. The speed of sound, attenuation, and the nonlinearity parameter (B/A)
all correspond very well to measured values seen in human tissue. These qualities give
the phantom its smooth appearance and allow the use of normal scanner control
settings, which mimic a realistic scanning situation that one might come across
clinically. This makes the 403 LE phantom an invaluable tool for training.
Scanning is the best way to familiarize yourself with the features and functions of the
403 LE. A guided tour of the phantom is provided on the following pages.
7
Evaluating the Phantom
Remember
A 4.5MHz probe will provide a good overall view of the phantom for this demonstration.
1. Turn the handle out of the way and slide the cover off the phantom.
2. To couple with water, fill the dam with distilled water. For a better image quality,
use gel.
3. Rest the transducer on the scanning surface. Adjust the scanner to display the
full depth of the phantom.
You may notice that the tissue echoes near the bottom of the phantom fade into
noise. The depth at which usable echoes disappear is called the depth of
penetration. The depth markers on the phantom label will help you determine
the depths of targets.
•The phantom comes ready to scan. Do not peel off surface
material.
•Never press the transducer into the scanning surface.
• Always clean and dry the scanning surface after each use. Never
leave coupling gel or water on the scanning surface for more than a
few hours.
•Do not use mineral oil, baby oil or lanolin-based gels as a coupling
medium.
8
4. Move the transducer across the scanning surface while observing the locations of
the targets.
Notice how the smooth texture of the tissue mimicking gel emphasizes image
non-uniformities and artifacts, making them easier to detect. Scanning an area
without targets is a good way to test for image uniformity.
Decrease gain controls to highlight pin targets.
5. Scan the vertical pin targets and freeze the image. Use the electronic calipers to
measure the distance between two of the vertical pin targets. Repeat for two of
the horizontal pin targets. The vertical pins have 2 cm spacing while the
horizontal pins have 3 cm spacing.
Use the pin targets to determine vertical distance accuracy and horizontal
distance accuracy. Note that the highest dead zone pin you can see should be
the point of reference not the scanning surface.
6. Freeze an image of the vertical pin targets. Use the electronic calipers to
measure the horizontal width of the pin targets in the near, mid and far fields of
the image.
Notice how the pin targets are narrowest in the focal zone. The pin width
demonstrates the width of the ultrasound beam at that depth and approximates
the lateral resolution of the scanner.
Measure pin width
to get lateral
resolution.
Pin targets are
narrowest in the
focal zone.
9
7. Decrease the image depth and examine the axial resolution target group at 3 cm.
Notice how the images of the lower pin targets may begin to merge. The smallest
distance between two pins that can be clearly resolved with no vertical overlap is
called the scanner’s axial resolution.
Pin targets are resolved axially if an imaginary horizontal line can be drawn
between the targets without touching either target. The targets on the left are not
resolved. The targets on the right are resolved.
Examine the other axial resolution target groups and compare the resolution at
various depths. Axial resolution may decrease with depth.
Unresolved Resolved
10
8. Scan the nearest cystic target group. Each target should be round with a clean
black appearance and well defined edges. Bright specular echoes at the top and
bottom of the targets are normal.
Measure the dimensions of the 6 mm cystic target to check the image geometry.
Use calipers to measure from top to bottom and side to side. Repeat with the
other cystic target groups as part of the cyst imaging test.
9. Decrease image depth to the minimum and examine the dead zone target group.
The dead zone targets can also be used to measure lateral resolution in the
extreme near field of the transducer.
Note: The highest dead zone pin you can see should be the point of
reference for all measurements – not the scanning surface.
10. When you are done scanning the phantom, empty the water dam or completely
clean off the coupling gel with a soft cloth or paper towel. Replace the cover and
secure by lifting the handle to protect the phantom.
Table des matières
Autres manuels Gammex Équipement de test
Manuels Équipement de test populaires d'autres marques
SMART
SMART KANAAD SBT XTREME 3G Series Manuel utilisateur
Agilent Technologies
Agilent Technologies BERT Serial Manuel utilisateur
Agilent Technologies
Agilent Technologies N3280A Manuel utilisateur
Vernier
Vernier Go Direct Voltage Manuel utilisateur
Lifeloc
Lifeloc R.A.D.A.R. Manuel utilisateur
Fluke
Fluke T5-600 Instructions d'utilisation et d'installation
