 | CIRS CBCT Electron Density Phantom. |  |
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CORRELATE CT NUMBER AND TISSUE ELECTRON DENSITYFeatures 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 |
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| CIRS Extended Version - Cone Beam Electron Density Phantom. | |
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INCREASE HU VALUE CONFIDENCE FOR ADAPTIVE RT Features 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. |  |
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| CIRS CBCT Electron Density Phantom. | |
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Increase HU value for Adaptive RT Features The Cone beam (CBCT) Electron Density Phantom is an extended version of the CIRS Model 062A 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 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 accommodates any ion chamber for dose measurements and |
| validation of heterogeneity correction based on the corrected CT calibration curve. The Model 062A OBI Electron Density Phantom measures 33 cm W x 27 cm H x 25 cm L and therefore covers geometries for imager dimensions of up to 40 cm x 40 cm. It is made of Plastic Water®. The phantom contains the same set of tissue equivalent electron density inserts as the standard Model 062 and has additional interchangeable slabs allowing for repositioning of electron density section with an increment of 2.5 cm. Notes for Optional Accessories: * 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. † Click Here to download ION Chamber Cavity Codes for Dosimetric Phantoms. Please refer to 062 Data sheet for physical density, electron density, and relative electron density of inserts listed above. |
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| CIRS Standard Electron Density Phantom. | |
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Correlate CT Number and Tissue Electron Density Features 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 062 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 062 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 062 Electron Density Phantom. SPECIFICATIONS
Overall Dimensions: 33 cm x 5 cm x 27 cm (13" x 2" x 10.6")
Weight: 24 lbs. (8.9 kg) Materials: Water and Tissue Equivalent Epoxy Materials Notes for Optional Accessories Table
* 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.
† Refer to separate CIRS cavity and plug code list for available chamber cavities. |
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| CBCT Electron Density and Image Quality Phantom. | |
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Minimize Dose • Increase Image Quality • Enhance Outcomes Features 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 |
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| CBCT Electron Density and Image Quality Phantom. | |
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Minimize Dose • Increase Image Quality • Enhance Outcomes Features 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. |
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