Pacific Northwest X-Ray Inc.

       CIRS CBCT Electron Density Phantom.       


Computerized Imaging Reference Systems, Inc! CORRELATE CT NUMBER AND TISSUE ELECTRON DENSITY

Features
  • Evaluate CT scan data
  • Correct for inhomogeneities
  • Document relationship between CT number and tissue electron density
  • Simulate indicated tissue within the diagnostic energy range
  • Quick assessment of distance registration

  • Because CT scans are used to correct for tissue inhomogeneities in radiotherapy treatment planning, it is important to obtain a precise relationship between CT number (in Housfield units) and electron densities. The Model 062M Electron density phantom enables precise correlation of CT data to electron density of various tissues. The phantom is manufactured from CIRS Tissue Equivalent Materials.

    The Model 062M consists of nested disks made from Plastic Water®. This enables both head and abdomen configurations. Eight different tissue equivalent inserts can be positioned at 17 different locations within the scan field. Included is a syringe insert that can be filled with any fluid or solid material. Special marker inserts enable quick assessment of the CT scanner's distance measurement accuracy.

    Physicists performing treatment planning need accurate tools to evaluate CT scan data, correct for inhomogeneities and to document the relationship between CT number and tissue density. To improve the accuracy of your treatment planning,


    consider the CIRS Model 062M Electron Density Phantom.

    The 062M is just one of three configurations available as a part of the Cone Beam CT Electron Density & Image Quality Phantom System.

    Specifications

    Overall Dimensions:
    Electron Density Head Insert: ø 180 mm x 50 mm (ø x D)
    Electron Density Body without Head Insert: 330 mm x 270 mm x 50 mm (W x H x D)

    Weight:
    Electron Density Head Insert: ≈ 0.950 kg (2 lbs.)
    Electron Density Body without Head Insert: ≈ 2.1 kg (4.7 lbs.)

    Materials: Water and Tissue Equivalent Epoxy Resins
    Warranty: 48 months

    * These inserts contain a 10 mm diameter core of indicated bone reference surrounded by H2O background. Hydroxyapatite (unit mg/cc) in H2O background Plugs to accommodate chambers, TLD's and film available upon special request.


    Stock #
    Description
    Your Price
    062M
    Electron Density Phantom (Includes
    Body with Head Insert and 19 Plugs)
    $4,563.69
    062MA-35
    Upgrade Kit to convert 062M to 062MA - Includes 3 Bolus slabs; Annulus w/solid insert; 10cm Plug; Holder; and Carry Case; 062M-14-CV must be ordered separately.
    $4,416.00


    Stock #
    Description
    Physical Density
    g/cc
    Electron Density
    electrons/cc
    Red
    Relative to H20
    Your Price
    062MA-07
    * 800 mg/cc HA in Water Equivalent - Insert
    1.53
    4.862
    1.456
    $288.00
    062MA-12
    * Titanium Rod Core Insert
    4.51
    12.475
    3.735
    $434.46
    062MA-13
    Distance Marker Insert
    1.029
    3.333
    0.998
    $288.00
    062MA-16
    Water Equivalent Insert
    1.029
    3.333
    0.998
    $249.85
    062MA-17
    * 1000 mg/cc HA in Water Equivalent
    Core Insert
    1.66
    5.243
    1.570
    $288.00
    062MA-18
    *1250 mg/cc HA in Water Equivalent
    Core Insert
    1.82
    5.663
    1.695
    $288.00
    062MA-19
    * ICRU Cortical Bone Equivalent Core
    Insert
    1.93
    5.956
    1.780
    $288.00
    062MA-20
    * 1500 mg/cc HA in Water Equivalent
    Core Insert
    1.99
    6.134
    1.837
    $288.00
    062MA-21
    * 1750 mg/cc HA in Water Equivalent
    Core Insert
    2.15
    6.600
    1.976
    $288.00
    062A-26
    Solid Dense Bone (1000 mg/cc HA)
    Equivalent Electron Density Plug
    1.66
    5.243
    1.570
    $288.00
    062A-28
    Solid Dense Bone (1500 mg/cc HA)
    Equivalent Electron Density Plug
    1.99
    6.134
    1.837
    $288.00
    062A-29
    Solid Dense Bone (1750 mg/cc HA)
    Equivalent Electron Density Plug
    2.15
    6.600
    1.976
    $288.00


    Model 062M Includes

    QTY
    Part No.
    Description
    Physical Density,
    g/cc
    Electron Density,
    electrons/cc
    RED
    (Relative to H2O)
    1
    062MA-01
    Electron Density Head Insert
    1.029
    3.333
    0.998
    1
    062MA-02
    Electron Density Body without Head Insert
    1.029
    3.333
    0.998
    2
    062A-04
    Lung (inhale) Equivalent Electron Density Plug
    0.20
    0.634
    0.190
    2
    062A-05
    Lung (exhale) Equivalent Electron Density Plug
    0.50
    1.632
    0.489
    2
    062A-06
    Breast (50% Gland/50% Adipose) Equivalent
    Electron Density Plug
    0.99
    3.261
    0.976
    2
    062A-08
    Solid Trabecular Bone (200 mg/cc HA)
    Equivalent Electron Density Plug
    1.16
    3.730
    1.117
    2
    062A-09
    Liver Equivalent Electron Density Plug
    1.07
    3.516
    1.052
    2
    062A-10
    Muscle Equivalent Electron Density Plug
    1.06
    3.483
    1.043
    2
    062A-11
    Adipose Equivalent Electron Density Plug
    2
    062A-15
    Solid Dense Bone (800 mg/cc HA)
    Equivalent Electron Density Plug
    1.53
    4.862
    1.456
    1
    062A-27
    Solid Dense Bone (1250 mg/cc HA) Equivalent
    Electron Density Plug
    1.82
    5.663
    1.695
    1
    062MA-39
    Water Equivalent Material Surrounding Removable
    Ø 1" Vial for Real Water Electron Density Plug
    1.00
    3.340
    1.000
    1
    062M-30
    Set of 2 Feet for Model 062M
    1
    062M-40
    Soft Carry Case for Model 062M
    1
    User Guide




           CIRS Extended Version - Cone Beam Electron Density Phantom.       


    Computerized Imaging Reference Systems, Inc! INCREASE HU VALUE CONFIDENCE FOR ADAPTIVE RT

    Features
  • Can be used for multi-slice CT and Cone Beam CT
  • Can be configured for central axis and off-set measurements
  • Manufactured from durable epoxy
  • Tissue equivalent inserts can be positioned at 17 different locations
  • Special marker inserts enable quick assessment of distance registration
  • All materials accurately simulate indicated tissue within CT and Cone beam CT energy range

  • The Cone Beam (CBCT) Electron Density Phantom is an extended version of the CIRS Model 062M Electron Density Phantom and specifically designed for Cone Beam CT Imaging systems. Preliminary data shows that there may be differences between the HU readings for Diagnostic CT and Cone Beam CT. The geometry of the Cone Beam CT requires additional material and suggests that off central axis measurements should be taken.

    The phantom was designed in collaboration with Dr. Peter H. Cossmann, PhD to provide a reliable tool for CT number to electron density calibration in volumetric imaging. Reliable CT calibration curves help enable treatment plan adaptation


    directly from Cone Beam CT data. Additionally, the phantom can accommodate any ion chamber for dose measurements and validation of heterogeneity correction based on the corrected CT calibration curve.

    The Model 062MA CBCT Electron Density Phantom's size covers geometries for imagers with dimensions of up to 40 cm x 40 cm. It is made of Plastic Water® and contains the same set of tissue equivalent electron density inserts as the standard Model 062M. Additional interchangeable slabs allow for repositioning of the electron density section with an increment of 2.5 cm.

    The 062MA is just one of three configurations available as a part of the Cone Beam CT Electron Density & Image Quality Phantom System.

    Specifications

    Overall Dimensions: 330 mm x 270 mm x 50 mm (W x H x D)
    Weight: ≈ 18 kg (40 lbs.)
    Materials: Water and Tissue Equivalent Epoxy Resins

    † Refer to separate CIRS cavity and plug code list for available chamber cavities. If the ion chamber cavity is not specified by customer, phantom is supplied with Part No. 062MA-14-CV50-1 that accommodates a Farmer type ion chamber. TLDs and Film available upon special request.




    Stock #
    Description
    Your Price
    062MA
    CBCT Electron Density Phantom (Includes Body with
    Head Insert, 4 Solid Rods
    $8,464.00


    Model 062MA Includes

    QTY
    Part No.
    Description
    Physical Density,
    g/cc
    Electron Density,
    electrons/cc
    RED
    (Relative to H2O)
    1
    062MA-01
    Electron Density Head Insert
    1.029
    3.333
    0.998
    1
    062MA-02
    Electron Density Body without Head Insert
    1.029
    3.333
    0.998
    2
    062A-04
    Lung (Inhale) Equivalent Electron Density Plug
    0.20
    0.634
    0.190
    2
    062A-05
    Lung (Exhale) Equivalent Electron Density Plug
    0.50
    1.632
    0.489
    2
    062A-06
    Breast (50% Gland / 50% Adipose) Equivalent
    Electron Density Plug
    0.99
    3.261
    0.976
    2
    062A-08
    Solid Trabecular Bone (200 mg/cc HA) Equivalent
    Electron Density Plug
    1.16
    3.730
    1.117
    2
    062A-09
    Liver Equivalent Electron Density Plug
    1.07
    3.516
    1.052
    2
    062A-10
    Muscle Equivalent Electron Density Plug
    1.06
    3.483
    1.043
    2
    062A-11
    Adipose Equivalent Electron Density Plug
    0.96
    3.171
    0.949
    2
    062A-15
    Solid Dense Bone (800 mg/cc HA) Equivalent
    Electron Density Plug
    1.53
    4.862
    1.456
    1
    062A-27
    Solid Dense Bone (1250 mg/cc HA) Equivalent
    Electron Density Plug
    1.82
    5.663
    1.695
    1
    062MA-39
    Water Equivalent Material Surrounding Removable
    Ø 1" Vial for Real Water Electron Density Plug
    1.00
    3.340
    1.000
    1
    062M-30
    Set of 2 Feet for Model 062M
    1
    062M-40
    Soft Carry Case for Model 062M
    1
    062MA-24
    50 mm Thick Bolus Slab
    1.029
    3.333
    0.998
    2
    062MA-32
    100 mm L x Ø 30 mm Background Equivalent Plug
    1.029
    3.333
    0.998
    1
    062MA-33
    12.5 mm Thick Bolus Slab
    1.029
    3.333
    0.998
    1
    062MA-34
    37.5 mm Thick Bolus Slab
    1.029
    3.333
    0.998
    1
    062MA-36
    CBCT Image Quality Phantom -Annulus
    (100 mm Thick)
    1.029
    3.32
    0.998
    1
    062MA-37
    CBCT Image Quality Phantom - Annulus
    Solid insert (100mm Thick)
    1.029
    3.333
    0.998
    1
    062MA-14-CV†
    Water Equivalent Chamber Rod with Cavity for
    Ion Chamber
    1.029
    3.333
    0.998
    1
    062MA-30
    Holder/Support set for Model 062MA & 062MQA
    1
    062MA-40
    Soft Carry Case for Model 062MA
    1
    User Guide
    -
    48 Month Warranty




           CBCT Image Quality Phantom.       


    Computerized Imaging Reference Systems, Inc! Minimize Dose • Increase Image Quality • Enhance Outcomes

    Features
  • Test Spatial Resolution, Low Contrast Resolution, Uniformity, CT Number Linearity and Slice Thickness
  • Use image quality section in head or body set-up
  • Perform dose measurements using Ion chamber
  • Calibrate Electron Density in multi-slice CT and Cone Beam CT
  • Perform central axis and off-set measurements
  • Position tissue equivalent materials at 17 different locations
  • Quick assessment of distance registration
  • Simulates indicated tissues within CT and Cone Beam CT energy range

  • The design intent of this phantom is to provide a tool that can be used for both electron density calibration and image quality assessment of Cone Beam CT systems integrated in radiation therapy devices. The electron calibration function of the phantom enhances the outcome of the adaptive radiation therapy while the image quality features address the fine balance between optimizing image quality while minimizing radiation dose.

    The CBCT Electron Density & Image Quality phantom consists of several sections: a 100mm thick body slab, a 100 mm thick CBCT Image Quality Head phantom, a 50mm thick Electron Density Phantom, and a Bolus consisting of a 37.5mm thick uniform slab, a 12.5mm thick uniform slab and a 50mm thick uniform slab.

    The 100 mm thick body section has a central hole that receives the CBCT Image Quality Head Phantom. Each Bolus slab is drilled to accommodate an ion chamber insert and allow for ion chamber measurements regardless of the position of the Head Insert. The thicknesses of the sections were selected to allow for positioning of any of the layers containing the Image Quality features in the central axis of the beam. Also sections of different thickness decrease the increment with which the electron density section can be offset from the central axis.

    The phantom support along with laser alignment marks allow for easy and quick positioning of the phantom on the accelerator couch. The phantom is placed on the support rails with the help of machined grooves. Buffer plates are provided to decrease the artifacts from the support device and to allow the user to access the handles on the support plates. The leveling of the support and implicitly the phantom is done by adjusting leveling feet.

    CBCT Image Quality Head Phantom


    The Phantom is comprised of four layers: spatial resolution, CT number linearity/slice thickness, low contrast and uniformity. The positioning of the different layers of the CBCT Image Quality Head phantom at the central axis can be done with the phantom in the 100mm body section or with the phantom placed directly on the support device.

    1) Spatial Resolution Layer - The Spatial Resolution Layer is designed to evaluate the spatial resolution of IGRT systems. Line pair patterns from 1 lp/cm to 16 lp/cm are embedded in the background. In order to minimize artifacts, each line pair pattern is made from a material with 350HU greater than the background attenuation. The line pair patterns are 3D patterns 12mm in height along the longitudinal axis of the CBCT Image Quality Head Phantom. The spatial resolution targets are arranged in a circular pattern.

    2) CT Number Linearity and Slice Thickness Layer - The CT Number Linearity and Slice Thickness Layer is designed to determine Contrast-to-Noise Ratio, Hounsfield number accuracy and Slice Thickness Sensitivity. Six rods made of Air, Low Density Polyethylene (LDPE), Polystyrene, Acrylic, Delrin and Teflon® are used to measure the CNR and Hounsfield Number Accuracy. Three angled air channels arrange in an equilateral triangle can be used to assess Slice thickness sensitivity.

    3) Low Contrast Layer - The Low Contrast Layer is intended to assess the system's ability to detect small differences in contrast. It contains three sets of low contrast rods with linear attenuation differences of 0.5%, 1% and 2% relative to the background material. The diameters of the low contrast rods were chose to provide a 0.5 ratio between two adjacent rods by cross section and volume.

    Additional features are designed to evaluate the magnification on the orthogonal axes of the transversal image and as input for calculation of the Point Spread Function and subsequent calculation of Modulation Transfer Function.

    4) Uniformity Layer - The Uniformity Layer is designed to measure the system's ability to produce uniform images across the field of view of an object with highly homogeneous physical properties in all directions.

    Electron Density Phantom
    The Phantom consists of nested disks made from Plastic Water®. The nested disks allow simulation of both head and abdomen configurations. Eight different tissue equivalent inserts can be positioned at 17 different locations within the scan field. The geometry of the phantom also enables the user to take measurement offset from the central






    axis.

    SPECIFICATIONS

    Model 062QA includes:
    1 Carry Case
    1 User Guide
    - 48 Month Warranty
    1 Phantom support and alignment device
    1 CBCT Image Quality Phantom includes: Spatial Resolution, CT Number Linearity/Slice Thickness, Low Contrast and Uniformity layers and Body section
    1 Electron Density Phantom includes: Body with Head Insert
    3 Bolus Sections - 50 mm, 37.5 mm, 12.5 mm thick
    1 H2O Syringe Insert
    2 Distance Marker Insert
    1 Chamber Rod for CV501
    1 Background Insert
    Electron Density Inserts
    2 Lung (Inhale) Equivalent Insert
    2 Lung (Exhale) Equivalent Insert
    2 Breast (50% Gland / 50% Adipose) Equivalent Replacement Insert
    2 Dense Bone (800 mg/cc HA) Equivalent Core Insert
    2 Trabecular Bone (200 mg/cc HA) Equivalent Insert
    2 Liver Equivalent Insert
    2 Muscle Equivalent Insert
    2 Adipose Equivalent Insert
    1 H2O Equivalent Insert

    Overall Dimensions: 25 cm x 33 cm x 27 cm (9.8" x 13" x 10.6")
    Weight: 40 lbs. (18 kg)
    Materials: Water and Tissue Equivalent Epoxy Resin




    Stock #
    Description
    Your Price
    062QA-35
    CBCT Image Quality Phantom ONLY
    $8,443.08




           CBCT Electron Density and Image Quality Phantom.       


    Computerized Imaging Reference Systems, Inc! Minimize Dose • Increase Image Quality • Enhance Outcomes

    Features
  • Perform all CT Image QA tests for AAPM TG Report #1
  • Use ionization chambers for dose measurements
  • Perform dose measurements using Ion chamber
  • Calibrate Electron Density in multi-slice CT and Cone Beam CT
  • Perform central axis and off-set measurements
  • Position simulated tissue materials in CT & CBCT energy range at 17 different locations
  • Optimized for volumetric imaging
  • Quick positioning and customized loading configurations

  • The design intent of this phantom is to provide a tool that can be used for both electron density calibration and image quality assessment of Cone Beam CT systems integrated in radiation therapy devices. The electron calibration function of the phantom enhances the outcome of the adaptive radiation therapy while the image quality features address the fine balance between optimizing image quality while minimizing radiation dose.

    The 062MQA CBCT Electron Density & Image Quality Phantom consists of several sections: a 100mm thick body slab, a 100 mm thick CBCT Image Quality phantom, a 50mm thick Electron Density Phantom, and a Bolus consisting of a 37.5mm thick uniform slab, a 12.5mm thick uniform slab and a 50mm thick uniform slab.

    The 100 mm thick body section has a central hole that receives the CBCT Image Quality Phantom. Each Bolus slab is drilled to accommodate an ion chamber insert and allow for ion chamber measurements regardless of the position of the Image Quality Insert. The thicknesses of the sections were selected to allow for positioning of any of the layers containing the Image Quality features in the central axis of the beam. Also sections of different thickness decrease the


    increment with which the electron density section can be offset from the central axis.

    The phantom support along with laser alignment marks allow for easy and quick positioning of the phantom on the accelerator couch. The phantom is placed on the support rails with the help of machined grooves. Buffer plates are provided to decrease the artifacts from the support device and to allow the user to access the handles on the support plates. The leveling of the support and implicitly the phantom is done by adjusting leveling feet.

    THE ONE TOOL SOLUTION FOR ELECTRON DENSITY CALIBRATION & IMAGE QUALITY ASSESSMEMT

    CBCT Image Quality Phantom
    The Phantom is comprised of four layers: spatial resolution, CT number linearity/slice thickness, low contrast and uniformity. The positioning of the different layers of the CBCT Image Quality phantom at the central axis can be done with the phantom in the 100mm body section or with the phantom placed directly on the support device.

    Spatial Resolution Layer - The Spatial Resolution Layer is designed to evaluate the spatial resolution of IGRT systems. Line pair patterns from 1 lp/cm to 16 lp/cm are embedded in the background. In order to minimize artifacts, each line pair pattern is made from a material with 350HU greater than the background attenuation. The line pair patterns are 3D patterns 12mm in height along the longitudinal axis of the CBCT Image Quality Phantom. The spatial resolution targets are arranged in a circular pattern.

    Low Contrast Layer - The Low Contrast Layer is intended to assess the system's ability to detect small differences in contrast. It contains three sets of low contrast rods with linear attenuation differences of 0.5%, 1% and 2% relative to the background material. The diameters of the low contrast rods were chose to provide a 0.5 ratio between two adjacent rods by cross section and volume.

    Additional features are designed to evaluate the magnification on the orthogonal axes of the transversal image and as input for calculation of the Point Spread Function and subsequent calculation of Modulation Transfer Function.






    CT Number Linearity and Slice Thickness Layer - The CT Number Linearity and Slice Thickness Layer is designed to determine Contrast-to-Noise Ratio, Hounsfield number accuracy and Slice Thickness Sensitivity. Six rods made of Air, Low Density Polyethylene (LDPE), Polystyrene, Acrylic, Delrin and Teflon are used to measure the CNR and Hounsfield Number Accuracy. Three angled air channels arranged in an equilateral triangle can be used to assess Slice thickness sensitivity.

    Uniformity Layer - The Uniformity Layer is designed to measure the system's ability to produce uniform images across the field of view of an object with highly homogeneous physical properties in all directions.

    Electron Density Phantom
    The Phantom consists of nested disks made from Plastic Water®. The nested disks allow simulation of both head and abdomen configurations. Eight different tissue equivalent inserts can be positioned at 17 different locations within the scan field. The geometry of the phantom also enables the user to take measurement offset from the central axis.

    SPECIFICATIONS

    Overall Dimensions: Ø 180 mm x 100 mm (Ø x D)
    Weight: ≈ 2.5 kg (5.6 lbs.)
    Materials: Water and Tissue Equivalent Epoxy Resins, Engineered Plastics

    † Refer to separate CIRS cavity and plug code list for available chamber cavities. If the ion chamber cavity is not specified by customer, phantom is supplied with Part No. 062MA-14-CV50-1 that accommodates a Farmer type ion chamber. TLDs and Film available upon special request.












    Stock #
    Description
    Your Price
    062MQA
    CBCT Electron Density & Image Quality Phantom
    $16,024.62


    Model 062MQA Includes

    QTY
    Part No.
    Description
    Physical Density
    g/cc
    Electron Density
    electrons/cc
    Red
    (Relative to H2O)
    1
    062MA-01
    Electron Density Head Insert
    1.029
    3.333
    0.998
    1
    062MA-02
    Electron Density Body without Head Insert
    1.029
    3.333
    0.998
    2
    062A-04
    Lung (Inhale) Equivalent Electron Density Plug
    0.20
    0.634
    0.190
    2
    062A-05
    Lung (Exhale) Equivalent Electron Density Plug
    0.50
    1.632
    0.489
    2
    062A-06
    Breast (50% Gland / 50% Adipose) Equivalent
    Electron Density Plug
    0.99
    3.261
    0.976
    2
    062A-08
    Solid Trabecular Bone (200 mg/cc HA) Equivalent
    Electron Density Plug
    1.16
    3.730
    1.117
    2
    062A-09
    Liver Equivalent Electron Density Plug
    1.07
    3.516
    1.052
    2
    062A-10
    Muscle Equivalent Electron Density Plug
    1.06
    3.483
    1.043
    2
    062A-11
    Adipose Equivalent Electron Density Plug
    0.96
    3.171
    0.949
    2
    062A-15
    Solid Dense Bone (800 mg/cc HA) Equivalent
    Electron Density Plug
    1.53
    4.862
    1.456
    1
    062A-27
    Solid Dense Bone (1250 mg/cc HA) Equivalent
    Electron Density Plug
    1.82
    5.663
    1.695
    1
    062MA-39
    Water Equivalent Material Surrounding Removable
    Ø 1" Vial for Real Water Electron Density Plug
    1.00
    3.340
    1.000
    1
    062M-30
    Set of 2 Feet for Model 062M
    1
    062M-40
    Soft Carry Case for Model 062M
    1
    062MA-24
    50 mm Thick Bolus Slab
    1.029
    3.333
    0.998
    2
    062MA-32
    100 mm L x Ø 30 mm Background Equivalent Plug
    1.029
    3.333
    0.998
    1
    062MA-33
    12.5 mm Thick Bolus Slab
    1.029
    3.333
    0.998
    1
    062MA-34
    37.5 mm Thick Bolus Slab
    1.029
    3.333
    0.998
    1
    062MA-36
    CBCT Image Quality Phantom - Annulus
    (100 mm Thick)
    1.029
    3.32
    0.998
    1
    062MA-37
    CBCT Image Quality Phantom - Annulus
    Solid insert (100 mm Thick)
    1.029
    3.333
    0.998
    1
    062MA-14-CV†
    Water Equivalent Chamber Rod with Cavity for
    Ion Chamber
    1.029
    3.333
    0.998
    1
    062MA-30
    Holder/Support set for Model 062MA & 062MQA
    1
    062MA-40
    Soft Carry Case for Model 062MA
    1
    062QA-35
    CBCT Image Quality Phantom
    Background (Uniformity, Low Contrast/Magnification,
    CT Number/Slice Thickness layer)
    1.029
    3.32
    0.998
    Background (Spatial Resolution layer)
    1.12
    3.66
    1.100
    1
    062MQA-30
    Holder/Support set for 062MA/062QMA
    1
    062MQA-40
    Soft Carry Case for 062QA-35 CBCT Image Phantom
    and 062MQA-30 Holder
    1
    User Guide
    -
    48 Month Warranty







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