3D Scanning Comes Full Circle

  • AutoSetup
  • No Tank Shifts
  • Better Data

Accurate, Reproducible Results

The 3D SCANNER is different by design. 3D SCANNER has been developed from the ground up to provide accurate, reproducible beam data in an era of modern treatment modalities and busy clinical staff. Learn more.

Varian Halcyon™ System Support

The 3D SCANNER with SNC DosimetryTM v3.6 will support beam model verification of Varian Halcyon Systems.

See All Halcyon QA Solutions >

Free Technical Report:
Beam Validation of Varian Halcyon™ System

Request this free report to learn more about the water scanning approach and results Sun Nuclear achieves for Beam Validation of the Halcyon Treatment System with our 3D SCANNER.

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The 3D SCANNER Advantage

The geometrical design, setup process, and software have all been developed to improve not only the accuracy of measurement data, but also the water tank setup process, making it less subjective and more reproducible.


  • Reproducibly and automatically sets detector position at the water surface, levels and aligns tank
  • Total time: < 20 minutes

No Tank Shifts

  • Position tank once
  • 650 mm scan range without moving tank
  • Position detector in any relevant 3D location
  • Consistent detector orientation without repositioning detector

Better Data™

  • Optimal signal to noise ratio for smoother scans without processing
  • Eliminate user setup subjectivity with AutoSetup and no tank shifts
  • Consistent detector orientation for in-plane, cross-plane, and diagonal scans
  • Searchable database for effective data management and sharing
  • Raw data is always available even if processing applied
  • Every data process layer is saved and accessible
  • Export PDF reports

360º of Scanning:

Detector Freedom

3D SCANNER offers a diameter drive for consistent detector orientation for in-plane, cross-plane, diagonal, and all other angles throughout the entire 360º circumference. Rotation range of 330º eliminates the need for tank shifts.

The 3D SCANNER system supports off-axis scans with this geometry by combining rotation and diameter movements during the measurement.

Scanning Range
Ring Range
S4 3 Dscanner 360

360 degrees of scanning with consistent detector orientation results in better data and eliminates the need to change tank setup.


Less Subjective, Saves Time

S5  No Shift Tanks

No Tank Shifts

3D SCANNER water sensor measures water surface relative to the scanning mechanism at three points and automatically adjusts the water tank leveling using two electric motors.

S5  Autocenter

Auto Center

3D SCANNER measures a 10 x 15 cm beam to determine the center of the beam relative to the center of 3D SCANNER. Two electric motors then align the center of the 3D SCANNER with the beam center.

S5  Auto Angle Offset

Auto Angle Offset

3D SCANNER uses a series of beam measurements to automatically establish in-plane and cross-plane home positions. The ring drive electric motor's zero position is set to the found cross-plane direction.

Consistent Detector Orientation

Better Results


S6 3 Dscanner

Square Tank

S6  Square Tank

Extended Scanning Ranges:

No Tank Shifts

Square 3D water tanks cannot measure a full 40 x 40 cm field at 30 cm depth and 100 cm SSD unless the user shifts the water tank twice, taking two measurements of two “halves” of the beam at different tank locations. This technique is time intensive and can introduce errors that compromise data quality.

The cylindrical shape of the 3D SCANNER enables the most efficient scanning ranges compared to square water tanks. A 65 cm scan range is possible without a shift of the 3D SCANNER. This allows a 40 x 40 cm measurement at 30 cm depth and 100 cm SSD, without the inconvenience and potential errors involved in shifting the water tank.

A 65 cm scan range is achieved with the offset detector holder, whereby two scans are merged and no tank shift is needed.

Square Tank MAX: 55 cm = Tank shift

3D SCANNER MAX: 65 cm = No tank shift

S7 35 Percent Increase

35% increase in scan range inline/crossline

Integrated Electronics

The 3D SCANNER design streamlines the connection and packaging of a 3D water tank system with several features:

Single Cable

3D SCANNER utilizes the same power/data cable that is used for other Sun Nuclear instruments, saving the user from installing another cable in the bunker.


All 3D SCANNER accessories plug directly into the 3D SCANNER eliminating the need for external junction boxes.


The electronics housing attaches to the 3D SCANNER and contains the following:

  • Electrometer Unit – A dual channel electrometer collects all field and reference data for the 3D SCANNER. The electrometer is guarded against extra cameral volume and provides exceptional specifications for low noise scan data that requires minimal processing
  • Control Unit – 3D SCANNER control electronics for motors and other hardware
S8 3 Dscannerdiagram

Intuitive Software Saves Time

3D SCANNER operates using SNC Dosimetry™ scanning software. SNC Dosimetry is a modern software application designed to offer both familiar concepts from existing water tank conventions, as well as new tools that were not previously available with a 3D water tank system.

S9 Laptop Copy

1. Queues

Queues organize and execute groups of scans. Queue results and analysis are displayed instantly for saving to a project.

2. Database

All data is indexed in a searchable database. Scanned data can then be shared among users as needed.

3. Layers

Unprocessed data and processing history is preserved and can be recalled as needed.

4. Analysis

Selected scans provide on-screen analysis.

5. Projects

Measurements may be organized in multi-level projects for customizable organization. Examples of projects include: annual QA and commissioning.

6. Graphs

Scanned data is displayed graphically.

7. Processing Layers

Each processing function is treated as a unique layer of the scan data. The processing layers do not overwrite the original scan data, so users may revert to earlier unprocessed data at any time.


3D SCANNER accessories

NEW! Reference Detector™

  • Patented out-of-field reference detector for use in water tank scanning of photon energies
  • Eliminates scanning chamber interference in small SRS fields
  • Use with any field size
  • No need to move location for different field sizes

3D MiniLift™

  • Straddles the linac couch ring for stability
  • Easily stored, requires less space
  • Fits through standard size doorways
  • Breaks down easily for transport

3D Reservoir™

  • Time to fill 3D Scanner: < 7 minutes
  • Time to empty 3D Scanner: < 5 minutes
  • Capacity of 187 liters

Waterproof PROFILER™

  • 50.4 cm scan area with 127 SunPoint® Diode Detectors
  • Quick connect to 3D SCANNER, no tools required
  • Detector size 0.8 x 0.8 mm with 4 mm detector spacing

EDGE Detector™

  • Accurate penumbra characterization for all fields
  • Ideal for steep dose gradients and small fields
  • On Accuray® Recommended QA Equipment list
  • 842 times smaller in volume than micro ion chambers
  • 100 times more signal than micro ion chambers
  • No dose volume averaging
  • Accuracy for critical penumbra measurements
  • Works with all common water phantoms


  • Less than 5 minutes to install – no tools required
  • Works with 3D Reservoir for fast drainfill time
  • 20 cm TPR drain measurement: 2.5 minutes
  • 20 cm TPR fill measurement: 3.5 minutes
  • Supports Varian, Elekta, Siemens and CyberKnife® systems


  • Reference, Field, Scanning dosimetry 0f electron and photon beams
  • IMRT/VMAT Quality Assurance
  • Enhanced penumbra without loss of signal strength
  • Waterproof and fully guarded
  • Vented to provide air‑density correction and eliminate the need for radioactive stability check device
  • White chamber body gives a clear line of sight to the crosshairs and lasers during set up and set up verification


  • Reference class ionization chamber (IEC 60731)
    • Highest performance and stability level
    • Satisfies recommendations of dosimetry protocols (e.g. AAPM’s TG-51 and IAEA’s TRS-398)
  • Follows classic Farmer chamber design
    • Compatible with most existing slab phantoms and detector holders
  • Fully guarded, vented, and waterproof
    • Quick setup with no required wait time before measuring
  • White thimble
    • For improved setup and accuracy
    • Crosshairs and lasers easily discerned on thimble
  • Rotational orientation mark
  • Improved accuracy through consistent orientation that calibration laboratory uses


  • Reference, field, and scanning dosimetry of electron beams
  • TDD/TPS Commissioning and QA
  • Conforms to the design principles as stated by Dr. M. Roos
  • Meets AAPM TG‑51 and IAEA TRS‑398 requirements for low‑energy beams
  • Reference dosimeter can be used to cross calibrate field dosimeters
  • Meets highest standards of performance (IEC 60731)
  • Well‑guarded to reduce in‑scattering perturbation effects
  • Vented to provide air‑density correction and eliminate need for radioactive stability check device
  • White chamber body allows easy visualization of the setup relative to the crosshairs and lasers


Why is the 3D SCANNER cylindrical?

1. Consistent detector orientation. The scanning detector is always in the ideal orientation (narrowest dimension perpendicular to the field edge), for crossline, inline and diagonal profiles. This eliminates effects of inconsistent detector orientation such as variable dose volume averaging, and delivers the sharpest possible penumbra.

2. More stable water surface. In a cylindrical tank the scanning detector always travels parallel to the scan rail, whereas in square tanks the entire rail travels to acquire inline profiles, and both rails travel for diagonal profiles, creating more ripples in the water. A cylindrical tank’s curved walls also help to reduce and cancel ripples.

3. Fast fill and drain time. Faster fill and drain time are achieved due to a smaller tank volume ( ~20% less water), an important advantage for TPR measurements. Fill/drain time is 3.5/2.5 minutes respectively.

4. No tank shifts. The maximum scan range on any axis of 65 cm should require no tank shifts. A tank shift requires a change to the setup, compromising the stability of the original scanning setup.

5. Scanning volume. Due to the cylindrical shape, ring drive, and scan rail, nearly the entire volume of a cylindrical tank is useful for scanning.

My beam is shaped square, should my water tank also be shaped square?

No. The raw beam generated by the linear accelerator is actually not square in geometry, and is shaped by a round flattening filter, and trimmed by primary and secondary collimators. A cylindrical tank more closely matches the actual beam geometry than a square tank.

Can I bypass AutoSetup and setup manually?

Yes. There are two ways: 1) The user can individually command portions of AutoSetup. 2) The user can manually adjust any setup parameter (except hysteresis) via pendant or software.

AutoSetup aligns the 3D SCANNER to beam CAX automatically, however if the beam is slightly off or skewed will the automatic CAX setup be incorrect?

No. Not even if there is an asymmetric field or if symmetry is wrong. During the "Adjust the ring center's position to the central axis" step, the Linac collimator is rotated by 180 degrees in order to eliminate any asymmetries from the centering process.

What is the maximum scan field size of the 3D SCANNER?

Without tank shifts, the 3D SCANNER can scan up to 65 cm with the included offset detector holder, or 50 cm without the offset detector holder. The 3D SCANNER can scan a full 40 x 40 cm field, with 5 cm tails at 100 cm SSD and at a depth of 30 cm with the offset detector holder. For a diagonal scan of a 40 x 40 cm field at 30 cm depth, an 80 cm SSD is used.

Do I have to adjust the gain setting each time I start a new scan?

The 3D SCANNER electrometer has a very large dynamic range so the gain does not need to be reset between scans when using the same detector. This includes high dose rate FFF beams.

Do I have to purchase TPS export modules?

No. All available TPS export modules are included in the 3D SCANNER’s SNC Dosimetry software. This can be a significant cost savings.

How is 3D SCANNER different from other systems regarding processing?

Each scan that has had processing retains a list of the processing layers, along with a time stamp of when the scan processing layer was added. Due to the 3D SCANNER’s database, raw data is saved, and each scan can always be returned to a previous layer of processing, or returned to its raw state. One may also see processing changes already implemented by selecting individual prior layers without reverting the processed scan.

Can I make off axis scan measurements?

Yes. This is most often requested for Pinnacle3 and measuring intra-leaf leakage. 3D SCANNER combines the Ring and Diameter Drive movements simultaneously to acquire off axis scan measurements.

How can I share data between colleagues and PCs?

SNC Dosimetry software has a “Save” function that will create files as .xml, .txt, or TPS-compatible .asci format, which allows sharing of data as with any other system that does not have a database. One may also create a database backup and send that to a colleague. The colleague can then open it as a new database on their system. The software can support multiple databases.

Features and Specifications


Vertical (mm): 400.0
Diameter (mm): 650.0
Ring (degrees): 330.0
Motors: Encoded stepper/servo
Scanning modes: Continuous and step
Scanning Speed Range (mm/sec): Variable up to 16
Scanning Accuracy (mm): 0.1

Water Tank

Thickness Wall / Bottom (mm): 13 / 19
Height (mm): 673
Width (mm): 875
Diameter Inner (mm): 676
Water Capacity (L): 166
Weight Empty / Full (kg): 44 / 210


Tank Centering: Automatic
Leveling: Automatic
Surface Detection: Automatic
TPS Export: Included

TPR/TMR Measurement

Drain Rate (cm/min): ~ 13
TPR Measurement Fill/Drain (min): ~ 3.5/2.5


Warm up Time (min): < 1.0
Charge: 10pC to no upper limit
Current: 10pA - 7.5nA
Leakage (pA): < 0.001
Collection Interval (ms): 50
Voltage (V): Adjustable, -400 to +400
Non-linearity: ± 0.1%
Repeatability: +/- 0.25%
A/D Converter: 16 bit
Linac Pulse Count: Included with threshold detection

Computer Hardware/Software Requirements

CPU: 2.4GHz; 2 cores
Hard Drive Space: 3GB
Operating System: Windows XP and 7
USB Version: 2.0
Video Card Memory:64MB

3D MiniLift

Vertical Height Min. (mm): 570.0
Vertical Height Max (mm): 950.0
Vertical Stability (mm): 1.0
Configuration Dimensions L/W/H (mm) Measurement: 1230.0 x 1130.0 x 584.0
Storage: 940.0 x 630.0 x 584.0
Transport: 1520.0 x 720.0 x 584.0
Disassembled Dimensions L/W/H (mm) Automatic Leveling Platform: 612.0 x 612.0 x 128.0
Lift: 305.0 x 406.0 x 508.0
Frame: 940.0 x 592.0 x 305.0
Total weight (kg): 87.7 (Does not include leveling platform)
Individual Component Weight (kg): Frame assembly: 45.7
Actuator assembly: 38.2
Handle: 3.8
Leveling Platform: 23.0

3D Reservoir

Max Fill / Drain Speed (min): 7 / 5
Dimensions L/W/H (cm): 114.2 x 65.0 x 90.0
Weight (Full / Empty, kg): 228.0 / 39.0
Capacity (L): 187.0
Fill and Empty Rate (L/min): 22.0
Ground Clearance (mm): 130.0


FFF: Yes
Stereotactic: Yes
Applicable TPS Systems: Yes
3D SCANNER AutoSetup
3D SCANNER Detectors
3D SCANNER Off Axis Scanning
3D SCANNER Cylindrical Design