Phantom Laboratory Catphan 503 Manual de usuario
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T h e P h a n t o m L a b o r a t o r y
C a t p h a n ® 503 M a n u a l
Copyright © 2017
WARRANTY
THE PHANTOM LABORATORY INCORPORATED (“Seller”) warrants that this product
shall remain in good working order and free of all material defects for a period of one
(1) year following the date of purchase. If, prior to the expiration of the one (1) year
warranty period, the product becomes defective, Buyer shall return the product to the
Seller at:
By Truck By Mail
The Phantom Laboratory, Incorporated The Phantom Laboratory, Incorporated
2727 State Route 29 PO Box 511
Greenwich, NY12834 Salem, NY 12865-0511
Seller shall, at Seller’s sole option, repair or replace the defective product. The Warranty
does not cover damage to the product resulting from accident or misuse.
IF THE PRODUCT IS NOT IN GOOD WORKING ORDER AS WARRANTED, THE
SOLE AND EXCLUSIVE REMEDY SHALL BE REPAIR OR REPLACEMENT,
AT SELLER’S OPTION. IN NO EVENT SHALL SELLER BE LIABLE FOR ANY
DAMAGES IN EXCESS OF THE PURCHASE PRICE OF THE PRODUCT. THIS
LIMITATION APPLIES TO DAMAGES OF ANY KIND, INCLUDING, BUT NOT
LIMITED TO, DIRECT OR INDIRECT DAMAGES, LOST PROFITS, OR OTHER
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER FOR
BREACH OF CONTRACT, TORT OR OTHERWISE, OR WHETHER ARISING OUT
OF THE USE OF OR INABILITY TO USE THE PRODUCT. ALL OTHER EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTY OF MERCHANT ABILITY AND FITNESS FOR PARTICULAR PURPOSE,
ARE HEREBY DISCLAIMED.
WARNING
This product has an FH3-4 mm/min ame rating and is considered to be ammable. It is
advised not to expose this product to open ame or high temperature (over 125° Celsius
or 250° Fahrenheit) heating elements.
CTP503
1/12/17
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T h e P h a n t o m L a b o r a t o r y
Catphan® Manual
Contents
Warranty 1
Introduction 4
Initial phantom positioning 5
Illustration of Catphan® 503 model 6
Phantom position verication 7
Incremental phantom module positioning 8
Drawings in the manual 8
CTP404 module 9
Patient alignment system check 10
Scan slice geometry (slice width) 11
Scan incrementation 12
Circular symmetry 13
Spatial linearity of pixel size verication 13
Spherical acrylic contrast targets 13
CT or Hounseld Numbers by David Goodenough, Ph.D. 14
Sensitometry (CT number linearity) 15
CTP528 High resolution module with 21 line pair per cm gauge and point source 17
Bead point source for point spread function and MTF 17
Use of automated scanner MTF programs 18
Bead point source (slice sensitivity prole) 19
21 Line pair per centimeter high resolution gauge 20
CTP486 Image uniformity module 21
Installation and removal of test modules 23
Optional phantom annuli 24
Dose Phantoms 25
Sample quality assurance program 26
Automated computer analysis program 27
Bibliography 28
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4
Introduction
The Catphan® 503 phantom conguration has been selected by Elekta. This manual
is intended to supplement the Elekta Procedures and Manuals by offering additional
details regarding the use of the Catphan® phantom. The Phantom Laboratory and
physicist, David J. Goodenough, Ph.D., are continually developing and researching new
tests and modications for the Catphan® phantoms. The test objects that make up the
current Catphan® models embody more than a quarter century of scientic evaluation
and eld experience. This manual outlines the applications of each module contained in
the Catphan® 503 phantom.
We do not make specic recommendations on the content of your quality assurance
program, because each medical imaging facility has its own unique set of requirements.
A sample program is provided to give you ideas for possible program content. We suggest
a review of local governing regulations, manufacturers’ specications and the needs of
your radiologists and physicists before developing your CT quality assurance program.
If you would like a pdf version of this manual they can be downloaded from the
Catphan® page of our website. www.phantomlab.com
If you have any additional questions please contact The Phantom Laboratory at:
Phone: 800-525-1190 or 518-692-1190
Fax: 518-692-3329
email: [email protected]
Additional product information is available at: www.phantomlab.com
5
Initial phantom positioning
The Catphan® phantom is positioned in the CT scanner by mounting it on the case.
Place the phantom case on the gantry end of the patient table with the box hinges away
from the gantry. It is best to place the box directly on the table and not on the table pads.
Open the box, rotating the lid back 180°. If you are using an annulus, additional weight
will need to be placed in the box to counterweigh the phantom. The patient straps can be
used for additional stability.
Remove the phantom from the box and hang the Catphan® from the gantry end of the
box. Make sure the box is stable with the weight of the phantom and is adequately
counterweighed to prevent tipping.
Use the level and adjust the black thumb screws to level the Catphan®. Once the
phantom is level, slide the phantom along the end of the box to align the section center
dots on the top of the phantom with the x axis alignment light. Raise or lower the
patient table so the laterial height dot on the side of the phantom aligns with the y axis
alignment light.
Use the z axis table drive to position the phantom for scanning.
Depending on the type of scanner being tested and the selected protocols there are
different ways to align the phantom along the z axis.
Cone beam CT: the most common approach is to center the scanner between the second
and third alignment dots and do a single scan that will provide slices of all test modules.
However because of beam divergence there will be variations between images taken of
a module that is in the center of the beam verses images taken on the edge of the beam.
6
Because of beam divergence a physicist may develop specic alignment protocols.
Single slice axial CT: the phantom can be centered on the CTP404 module and then
after verifying the alignment, the table can be indexed to the center of the other modules.
Spiral CT: the scanner can be aligned with the rst module and then the phantom can
be scanned in one sequence.
Review the scans of the CTP404 module to check the image for proper alignment as
illustrated in the Phantom position verication section.
Illustration of Catphan® 503 model
Note: The brass mount nuts hold the mount to the phantom housing. Only the black
adjusting thumb screws should be used to level the phantom.
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Phantom position verication
By evaluating a scan image of the CTP404 module the phantom’s position and alignment
can be veried. The section contains 4 wire ramps which rise at 23° angles from the base
to the top of the module. The schematic sketches below indicate how the ramp images
change if the scan center is above or below the z axis center of the test module. The use of
the scanner’s grid image function may assist in evaluation of phantom position.
If misalignment is indicated by the scan image, the phantom should be repositioned to
obtain proper alignment and then rescanned. If the images of the repositioned phantom
duplicate the original misalignment indications, the scanner’s alignment lights may
require adjustment (contact your local service engineer).
Once correct alignment has been established, you can proceed with the tests.
8
Incremental phantom module positioning
The Catphan® 503 phantom is designed so all test sections can be located by precisely
indexing the table from the center of module CTP404 to the center of the other test
modules. The indexing distances from the center of the CTP404 module are listed below.
Catphan® 503 test module locations:
Module Distance from the center of CTP404
CTP528, 21 line pair high resolution 30mm
CTP486, Solid image uniformity module 110mm
Drawings in the manual
The drawings in this manual show a schematic view of the modules as they would be
seen in a typical head rst CT scan where the right side of the phantom is shown on the
left side of the image.
Most of the schematic drawings show the 15cm diameter module without the 20cm
diameter housing. Please note that the modules are pressed into the housing and
sometimes there is a small air gap that creates a black crescent line between the test
module and the housing. This is shown on the above illustration running from the 10:00
to 12:30 positions. Since this is a radial air gap it will not affect the internal image
measurements if the phantom is centered in the scan eld.
9
CTP404 Module with slice width, sensitometry and pixel size
10
Patient alignment system check
The laser, optical, and mechanical patient alignment system can be checked for accuracy.
Align the white dots on the phantom housing with the alignment lights as discussed
in Initial phantom positioning. The scanned image should show good alignment as
discussed in Phantom position verication.
For measuring the z axis alignment accuracy, measure from the center of the ramp image
to the part of the ramp which aligns with the center of the phantom and sensitometry
samples. Multiply the distance A by 0.42 to determine the z axis alignment light
accuracy. To evaluate x and y accuracy, measure from the center of the phantom to the
center of the scan eld by use of the grid function or knowledge of the central pixel
location.
The accuracy of the localizer, pilot or scout view can be checked. To check this function
perform a localization scan of the phantom. Align an axial scan at the crossing point of
the wire ramps. Scan this axial cut and check the misalignment as discussed above.
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