ArcCHECK - PEO Radiation Technology · - 4D array worldwide market share leader DVH analysis...
Transcript of ArcCHECK - PEO Radiation Technology · - 4D array worldwide market share leader DVH analysis...
Benefits
The Ultimate 4D QA SolutionA 4D isotropical cylindrical detector array for arc delivery QA and Dosimetry
ArcCHECK®
4D Patient plan QA
- RapidArc, VMAT, Tomotherapy, and SmartArc
- Conventional IMRT and 3D Conformal
- 4D array worldwide market share leader
DVH analysis (3DVH® Option)
Machine QA
- Tests for MLC, flatness, symmetry, starshot
SunPoint® Diode Detectors
- Smallest detector (0.0000019cm)
- Highest sensitivity
- Proven stability
Consistent BEV for all gantry angles
Measure composite dose, and control point ranges
Measures every pulse with real-time updates (50ms)
Versatile cavity for detector inserts
Single power/data cable. Manages all power and
data in one connection
Integrated electronics. ArcCHECK is self-contained
with no electronics to setup separately; and unlike
2D arrays, a separate phantom is not needed
Lightweight (16kg). ArcCHECK is easily portable
for daily use without the need for a separate cart
Easy setup. Leveling LED’s provide real-time feedback on
device rotation and tilt for a precise and easy setup
Patented user calibration. Clinically proven wide field
calibration (WFC) takes only 30 minutes and does not
require disassembly of the ArcCHECK device
No pre-irradiation. No Pre-irradiation or warm-up
required for absolute dose measurements
Ease of Use
Your Most Valuable QA and Dosimetry Tools
RnRADON
FFF BeamsVMATRapidArc®
TomoTherapy®
Pinnacle3 SmartArc™Conventional IMRT
Compatible with:
U.S.Patent No. 8,044,359; 6,125,335
T +31 (0)24 648 86 88
Nederland België / Belgique
T +32 (0)3 309 32 09 [email protected]
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With ArcCHECK, see the entire picture
Below is what a 2D array and ArcCHECK will see for the same plan measurement. ArcCHECK highlights areas that would
not normally be seen with a 2D array. Measure and correlate gantry angle, leaf end position, absolute dose and time
(4D) to identify the source of the error. Error sources include a TPS, delivery system, imaging system, setup, and MLC.
2D Array Measured: With a 2D array, only a fraction of dose
information is available, this is inherent with all available 2D arrays
What you see with a 2D array What you see with ArcCHECK
0o 180o
ArcCHECK Measured: ArcCHECK displays BEV dose distribution
throughout the entire arc delivery. More data is available to perform
a more thorough QA analysis
2D
1D
3D
3D
3DVariable Coherent. ArcCHECK detectors and their angle of
incidence remain coherent to the delivery beam
regardless of angle. The BEV detector geometry does
not change based on angle. When a 2D array is irradiated
obliquely, the 2D array degrades to 1D. Even if there is no
detector shadowing effect, significant information is lost
on a 2D array.
Shape. Phantoms are ideally shaped like a patient. The
cylindrical design of ArcCHECK intentionally emulates patient
geometry to better match reality.
Lost data
Lost data
Chambers Ion chamber measurements lack high-resolution, resulting in a blurred measurement
Diodes Diodes are capable of accurate, reproducible high-resolution measurements. ArcCHECK usesSunPoint Diode Detectors
EPID/Film EPIDs and film have good density and resolution, however absolute dose, accuracy, uniformity and reproducibility need to be verified
SunPoint® Diode Detectors: The Right Choice for QA & Dosimetry
A cylindrical design is most appropriate for arc delivery applications
3ArcCHECK
Hardware
ArcCHECK Detector BEV (Beams Eye View)Beam Delivery
Leading Specifications
1386 SunPoint Diode Detectors
21.0cm array diameter and length
Patented user calibration
Only one cable connection
Lightweight -16.0kg
HeliGrid™
Helical detector geometry
Less detector overlap from a BEV perspective
Increased detector density
Cylindrical Advantage: Coherent QA
BEV is consistent regardless of angle
- Detectors remain coherent to beam vectors
Measure entrance and exit dose
Versatile central cavity
Cylindrical array is shaped like a patient
Central Cavity
Reduces weight
Tests TPS modeling
Accommodates inserts and detectors
21 x 211386 Detectors
10 x 10230 Detectors
ArcCHECK contains a sophisticated yet easy to use leveling
system that ensures setting up for measurement is quick
and easy. With built in rotation and tilt inclinometers, the
ArcCHECK can relay setup status to the user in real-time.
Leveling LED’s
Power/Data Cable
Hardware that is easy to setup and use
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Stringent measurement
ArcCHECK shown with the optional CavityPlug for measuring dose at isocenter.
Acrylic insert
Detector holder
MultiPlugTM
CavityPlugTM
ArcCHECK measures entry and exit dose for every angle.
Measuring completely around the isocenter in a uniform
manner for each angle is a more stringent measurement
than a simple composite dose at the isocenter. Errors visible
in the isocenter can also be visible in the surrounding dose
measurements, but in more detail.1 For those who would
like to measure the dose at isocenter or elsewhere within
the cavity, Sun Nuclear offers the versatile MultiPlug, and
CavityPlug with detector insert.
it PlTM
Entrance dose
Exit dose
Features MultiPlug CavityPlug
Hounsfield conversion testing
Precision fitted to ArcCHECK cavity
Inhomogeneity insert options
Muscle -Bone -Lung -
Adipose -Titanium -
Dose in cavity center
Dose in up to 25 unique locations
Film cassette insert
Bezel angle indicator for rotation within cavity
PMMA (acrylic) construction
Included precision milled detector holder
Included solid insert for completely solid cavityFeat
ure
Co
mp
aris
on
ArcCHECK shown with the optional MultiPlug for measuring dose at up to 25 locations.
5ArcCHECK
Virtual Inclinometer™
For any delivery, ArcCHECK will calculate
the gantry angle independently using a
unique Virtual Inclinometer. This enables
correlation of dose and time with angle (4D).
The Virtual Inclinometer is accurate to ±1°,
and avoids additional inclinometer cables
and mounting to the delivery system.
Control Point Analysis
Scrutinize arc plans via ArcCHECK’s Control
Point Analysis feature. Individual control
points and user defined arc sections can
be analyzed for a full arc or sub-arc.
A unique polar graph with movie playback
offers a 360° presentation of pass, low, and
high dose summary for the defined control
point range and sub-arcs.
Charted gantry angle as a function of time
Automatic gantry angle calculation display
Measured Planned
Control Point Analysis
Machine QA
Use ArcCHECK for a wide variety of machine
QA tests. Easily check reproducibility and
export data files for independent analysis.
In version 6.2, use built in tests for:
Gantry angle QA with ArcCHECK
Gantry Angle QA MLC QA
Starshot Flatness*
- Gantry rotation Symmetry*
- Collimator rotation
- Couch rotation
*Photons only
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The ArcCHECK interface is SNC Patient software; a powerful
and proven patient QA and analysis tool with over 2000
clinical installations.
The same analysis and workflow options from MapCHECK
are available in ArcCHECK
For larger fields, two ArcCHECK measurements may be
concatenated
All data files from ArcCHECK are an open format for easy
export, including raw data
ArcCHECK QA plans are in three dimensions. DICOM
RT Dose is imported and a 3D dose grid corresponding
to detector locations is extracted for comparison to
measured.
SNC Patient™ Software
With a single mouse click, SNC Patient Software compares measured dose points to planned dose points. Users can compare normalized data or absolute dose data using distance to agreement or Gamma. Three adjustable criteria guarantee maximum flexibility and are easily adjusted. Measured points that do not fit within the acceptance criteria are highlighted red for high dose and blue for low dose.
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1 Compare: Measure, then click compare to see the results against the planned file
2 TH: Isodose percentage line that defines the dose area to evaluate
3 % Diff: Percent acceptance criterion between Set 1 and Set 2 dose values
4 mm: Distance-to-agreement criterion
5 % Pass: Percentage of detector points that passed within the defined threshold with a pass/fail indication
6 Calc Shift: Determines a misalignment between measured & planned dose maps and automatically corrects if accepted by the user
measured
compare
profiles, histograms, more...
Angle of measurment indication
7ArcCHECK
DVH Analysis (3DVH)
3DVH is a patented (U.S.Patent No. 7,945,022) method that enables the
comparison of measured and planned DVH’s without the complications
of a secondary dose algorithm. The planned DVH is extracted from the
DICOM patient plan file, then compared to the ArcCHECK measured
DVH result.
planned
1 Measured ArcCHECK dose differences perturb
the original planned dose, allowing comparison of
original planned and as measured planned
2 DICOM RT structures are presented for DVH
analysis, giving a clinically significant analysis of
the impact of measured dose differences
3DVH Independent Publications1) “Per-beam, planar IMRT QA passing rates do not predict clinically relevant patient dose errors”
Med Phys. 2011 Oct;38(2):1037-10442) “ Moving from gamma passing rates to patient DVH-based QA metrics in pretreatment dose QA”
Med Phys. 2011 Oct;38(10):5477-893) “Evaluation of the accuracy of 3DVH software estimates of dose to virtual ion chamber and film in composite IMRT QA”
Med Phys. 2012 Jan;39(1):81-64) “VMAT QA: Measurement-guided 4D dose reconstruction
on a patient” Med. Phys. 2012 July; 39(7), 4228-4238
1386 SunPoint Diode Detectors
Helical Grid (HeliGrid) Geometry
21.0cm Array Length
1.0cm Detector Spacing
Central cavity
Features
21.0cm Array Diameter
All data used is best available at time of publication. Data is subject to change without notice. All Content ©2012, Sun Nuclear Corporation. All Rights Reserved. Elekta, VMAT and its logo are all trademarks of Elekta AB. TomoTherapy and its logo are all registered trademarks or service marks of TomoTherapy Inc. RapidArc and its logo are all trademarks of Varian Medical Systems, Inc.
sun
2.9cm Physical Detector Depth
SunPoint®
PRECISION QA
Detector type: SunPoint Diode Detectors
Detector quantity: 1386
Detector spacing (cm): 1.0
Array diameter (cm): 21.0
Array length (cm): 21.0
Cavity diameter (cm): 15.0
Inherent buildup (g/cm2): 3.2
Inherent backscatter (g/cm2): 3.2
Detector physical depth (cm): 2.9
Array geometry:Helical Grid (HeliGrid) 1cm offset
Phantom Material: PMMA (Acrylic)
Active detector area (mm2): 0.64
1222D06182012
1 “Novel dosimetric phantom for quality assurance of volumetric modulated arc therapy”, Daniel Létourneau, Julia Publicover, Jakub Kozelka, Douglas J. Moseley and David A. Jaffray, Medical Physics, Vol. 36, No. 5, May 2009
2 “Modeling the instantaneous dose rate dependence of radiation diode detectors”, J. Shi, W.E. Simon, T.C. Zhu, Med. Phys. 30 (9), 2509-2519 (2003).
3 “Performance evaluation of a diode array for enhanced dynamic wedge dosimetry”, T. C. Zhu et al, Med Phys 24, 1173-1180 (1997).
4 “Dose rate and SSD dependence of commercially available diode detectors”, AJ S. Saini and T. C. Zhu, Med. Phys., 31 (4), 914-924 (2004).
Testimonial - “We are using the ArcCHECK for about a year now for QA of our clinical IMRT plans. On the basis of our experiences we can conclude that the ArcCHECK is not only suitable for the QA of Elekta Linacs, but also for small stereotactic fields (up to 3x3 mm2) from a Novalis Linac (Brainlab).”
- Dr. Paul Rietveld, Ph.D. Radiotherapiecentrum The Netherlands
Detector volume (cm3): 0.000019
Detector stability: 0.5%/kGy at 6MV
Dose rate dependence: ± 1%, 75 - 250cm SSD
Update frequency (ms): 50
Radiation measured: Photons, Co-60 to 25 MV
Number of connection cables: Single power/data cable
Dimensions (cm2) / Weight (kg): 27.0 x 43.0 / 16.0
Operating system: Windows 2000, XP, Vista, 7 (32 or 64 bit)
Computer Requirements:
4GB RAM, 1 available USB 2.0 port, Dual-core processor (2.4GHz or higher), 5GB hard disk space, 32MB VRAM video card, 32-bit color depth, OpenGL hardware accelerated
Specifications
T +31 (0)24 648 86 88
Nederland België / Belgique
T +32 (0)3 309 32 09 [email protected]