SRS Patient QA, No Film

  • SRS patient specific QA and end-to-end testing
  • Film replacement for small field dosimetry

SRS Patient QA, No Film

Srsmc Diode Bubble 6

With improvements in targeting and localization, stereotactic treatments have become prevalent. To address these types of treatments, a detector array with absolute accuracy is paramount. The SRS MapCHECK® addresses this need, and replaces traditional measurement methods with a consistent workflow to maximize your time.

“The SRS MapCHECK is an effective tool for patient-specific and end-to-end stereotactic QA. It shows very good agreement with film dosimetry for field sizes ranging from 7.0 cm to 0.5 cm. It proves to be an effective, time-saving substitute for film and point dose measurements.”

Brett Miller, M.S., DABR

University of Tennessee Medical Center

SNC Patient™ Software

SNC Patient™ software allows rapid analysis of QA measurements against plan. Simply import the QA files from your treatment planning system (TPS) and SNC Patient software compares the dose distribution of the treatment plan file to the actual measured values.

Features & Benefits

  • 2D array for SRS applications
  • 1,013 SunPoint® 2 Diodes, providing high resolution
    • 2.47 mm (center-to-center) detector grid
    • 0.48 x 0.48 mm active area
  • Replaces film and standalone detector, expediting the workflow for time-sensitive patient QA
    • Provides absolute and relative dose in a single measurement
  • Works with static, rotational, coplanar and noncoplanar (including vertex1), CyberKnife®, FFF, cone and MLC fields
    • 6MV and 10MV
  • With the StereoPHAN, supports irradiation from any gantry angle
    • Angular dependence, field size and pulse rate are accounted for and corrected to ensure accurate dose measurements
  • Integration
    • Designed to insert into the StereoPHAN
    • Runs on SNC Patient™ software

1 10MV (flattened and FFF) non-coplanar fields are supported for couch angles up to +/-45 from nominal


  • Provides the data necessary to meet the requirements in AAPM TG-101 ( <1mm resolution and end-to-end testing annually for SBRT programs).
  • Detects and corrects for translational offset between compared datasets with precision of 0.1mm for SRS applications
  • Supports Gamma Analysis2 in absolute and relative dose mode with user-specified rates greater than 90% using 3% and 1 mm, global, as compared to True Dose3
  • Easy to setup, measure and analyze
  • High spatial resolution and high spatial sampling frequency
  • Ability to evaluate delivered dose with gantry and couch geometries as specified in the patient plan
  • Ability to rotate and allow measurements of different dose planes within the StereoPHAN
  • Optimization-based Calculation Shift algorithm supports co-registering measurements to planned dose with 6 degrees of freedom
  • Instantaneous analysis results / no film scanning

2 Ju, T., Simpson, T., Deasy, J. O., & Low, D. a. (2008). Geometric interpretation of the dose distribution comparison technique: Interpol ation-free calculation. Medical Physics, 35(3), 879

3 True Dose- determined from film measurements, calculations from commissioned treatment planning systems or other means acceptable in clinical practice

Streamline your Workflow

Srsmc Workflow Copy


Srsmc Stereophan Diagram B


Detector Type: SunPoint® 2 Diode Detectors
Detector Quantity: 1,013
Detector Spacing (mm): 2.47
Active Detector Area (mm x mm): 0.48 x 0.48
Array Size (mm): 77 x 77
Detector Sensitivity (nC/Gy): 15
Sampling Frequency (ms): 50
Dose Rate Dependence: +/- 1.5% over the range 100MU/min to 2400 MU/min
Inherent Buildup (g/cm2): 2.75
Inherent Backscatter (g/cm2): 2.75
Radiation Measured: Photons: 6MV, 10MV, 6FFF,10FFF
Number of Connection Cables: Single power/data cable
Dimensions (L/W/H): 320 x 105 x 45 (mm)
Weight (kg): 1.9

System Requirements (SNC Patient)

Operating System: Windows 7, Windows 8.1,Windows 10 Professional
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 mor e