The ArcCHECK is the world’s most selected independent 4D measurement array. Simply connect the single cable which supplies both power and data, and start to measure. No background measurements, no warm-up, no separate inclinometers, no additional hardware rotisseries. It’s that simple, and that powerful.
Patient Plan QA
Stringent, fully independent measurement QA of patient plan and delivery with SNC Patient software
Dose and DVH QA
Full 3D Dose reconstruction for target and OAR DVH QA with 3DVH® software
Dynamic machine QA testing routines are provided for a wide variety of tests with SNC Patient software
ArcCHECK embodies the spirit of independent Medical Physics measurement.
An Ideal Geometry
Phantoms are ideally shaped like a patient. The cylindrical design of ArcCHECK intentionally simulates patient geometry to better match reality.
ArcCHECK detectors are always facing the delivery beam regardless of gantry angle. The detector geometry relative to the BEV remains constant. Detection of very small gantry angle errors is possible. In contrast, when a 2D array is irradiated obliquely, the geometry collapses to 1D. Even when there is no detector shadowing effect, significant information is lost on a 2D array, and errors up to 10° are missed 75% of the time.
With ArcCHECK, gantry angle, leaf-end position, absolute dose, and time (4D) are measured and correlated to identify sources of error. Dose accuracy is improved and errors can be traced to the treatment planning system, the delivery system, or the imaging system.
An inherent limitation of 2D arrays is an inability to capture all of the dose information for rotational deliveries.
ArcCHECK displays BEV dose distribution throughout the entire arc delivery. More data is available to perform a more thorough QA analysis.
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 are also visible in the surrounding dose measurements, but in more detail.
ArcCHECK measures entry and exit dose for every angle. For each beam angle, ArcCHECK measures high dose regions at the entrance and low dose regions at the exit, detecting potential delivery and TPS modeling errors for both high and low dose levels. 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.
ArcCHECK calculates gantry angle independently using entrance and exit dose.
ArcCHECK contains a sophisticated yet easy to use leveling system that ensures a quick and accurate setup.
Two ArcCHECK measurements can be combined in SNC Patient software
for larger field sizes.
Merge feature provides 442 detectors within a 10x10 field.
With a single mouse click, SNC Patient Software compares measured ArcCHECK dose points to planned dose points. Compare normalized data or absolute dose data using Distance to Agreement (DTA), Gamma (γ), and Gradient Compensation.
Individual control points and user-defined arc sections can be analyzed for a full arc or sub arc. A 360° presentation of pass, low, and high dose summary for the defined control point range and sub arcs is presented.
Evaluate the difference between the planned and delivered MLC pattern, and identify leaves that may indicate required service. Additional machine QA tests are also included.
Sun Nuclear’s 3DVH software offers a unique quality assurance tool for patient specific IMRT QA. Testing was conducted for IMRT plans where we introduced known errors in both absolute dose and geometry of the delivered fields. These differences were accurately detected and reported by 3DVH and gave us a high degree of confidence in the system’s ability to detect treatment delivery errors. The system also revealed that where beams may “pass” in a 2D analysis, regions of failure and match were more clearly revealed in a 3D analysis.
3%/3mm criteria showing 99.2% passing rate, a good test of deliverability and machine performance.
Evaluating the same plan, 3DVH shows substantial target underdose, indicating that although the plan was properly delivered, the clinicial impact was below expectations
Simulate the dosimetric impact of target motion with proven accuracy.
Use ArcCHECK for a wide variety of machine QA tests in dynamic and rotational mode.
Commissioning Monte Carlo algorithm for robotic radiosurgery using cylindrical 3D-array with variable density inserts
Dechambre et al., Liege University Hospital, Belgium, European Journal of Med Physics, 33 (152-158) (2017)
A comparison of the gamma index analysis in various commercial IMRT/VMAT QA systems
M. Husseina et al., Radiotherapy and Oncology 109 (3), (2013)
A novel method for routine quality assurance of volumetric-modulated arc therapy,
Q. Wang et al., Med. Phys. 40 (10), (2013)
Optimizing the accuracy of a helical diode array dosimeter: A comprehensive calibration methodology coupled with a novel virtual inclinometer,
J. Kozelka et al., Med. Phys. 38 (9), (2011)
VMAT QA: Measurement-guided 4D dose reconstruction on a patient,
B. Nelms et al., Med. Phys. 39 (7), (2013)
Moving from gamma passing rates to patient DVH-based QA metrics in pretreatment dose QA,
H. Zhen et al., Med. Phys. 38 (10), (2011)
Using a Novel Dose QA Tool to Quantify the Impact of Systematic Errors Otherwise Undetected by Conventional QA Methods: Clinical Head and Neck Case Studies,
M. Chan et al., Technology in Cancer Research & Treatment 13 (1), (2014)
Evaluating IMRT and VMAT dose accuracy: Practical examples of failure to detect systematic errors when applying a commonly used metric and action levels,
B. Nelms et al., Med. Phys. 40 (11), (2013)
Sensitivity of volumetric modulated arc therapy patient specific QA results to multileaf collimator errors and correlation to dose volume histogram based metrics,
L. Coleman et al., Med. Phys. 40 (11), (2013)
|Detector Type:||SunPoint® Diode Detectors|
|Detector Spacing (cm):||1.0|
|Array Diameter (cm):||21.0|
|Array Length (cm):||21.0|
|Cavity Diameter (cm):||15.0|
|Inherent Buildup (g/cm2):||3.3|
|Inherent Backscatter (g/cm2):||3.3|
|Detector Physical Depth (cm):||2.9|
|Array Geometry:||Helical Grid (HeliGrid)1 cm offset|
|Phantom Material:||PMMA (Acrylic)|
|Active Detector Area (mm2):||0.64|
|Detector Sensitivity (nC/Gy):||32.0|
|Max Dose/Pulse (Gy):||0.003|
|Detector Volume (mm3):||0.019|
|Detector Stability:||0.5% / kGy at 6 MV|
|Dose Rate Dependence:||± 1%, 75 - 250 cm SSD|
|Update Frequency (ms):||50|
|Number of Connection Cables:||Single power/data cable|
|Dimensions (cm2):||27.0 x 43.0|
System Requirements (SNC Patient, EPIDose, 3DVH)
|Operating System:||Windows XP, Windows 7, Windows 8.1|
|CPU:||Recommended 2.4 GHz or better, multi‑core (2 or more cores)|
|RAM:||Recommended 4 GB or more|
|Hard Drive Space:||Recommended 5 GB or more|