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美國(guó)CIRS 062MQA超聲波測(cè)試模體既可以用于電子密度校準(zhǔn)，也可以用于輻射治療設(shè)備中集成的錐束CT系統(tǒng)的圖像質(zhì)量評(píng)估。
美國(guó)CIRS 062MQA超聲波測(cè)試模體產(chǎn)品簡(jiǎn)介：
The design intent of 062MQA 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.
美國(guó)CIRS 062MQA超聲波測(cè)試模體產(chǎn)品特點(diǎn)：
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 One Tool Solution for Electron Density Calibration & Image Quality
Assessment
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.
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.
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.
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 phantom 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.
NOTE: This product or an optional accessory of this product requires a CIRS
dosimetry cavity code before an order can be placed. Please refer to the
Dosimetry Cavity Codes document to identify the CIRS code for the probe you
intend to use with this product.
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