mgsresearch.com
mgsresearch.com
d.b.a. 3D Dosimetry
  • QAbyMail™ Service: High-Definition 3D End-to-End QA for Patient Safety in Radiation Therapy and Radiosurgery
    ​​

    Email: support@mgsresearch.com 



    CrystalBalls™:  


    Polymer gel dosimeters:

    Sealed inside glass spheres
    Standard human head size
    Radiochromic
    Self-developing

    Muscle-equivalent


    Time-efficient workflow:

    Instant setup

    Standard size

    No cables

    No electronics

    Easy packaging


    Readout:

    Laser CT scanning 

    at 3D Dosimetry Lab



    CrystalBall
    The CrystalBall™ mounted in a QA stand and ready for simulator CT
    CrystalBall
    The CrystalBall™ set up for Proton Therapy QA
    CrystalBall
    CrystalBall™ mounted in an SRS head frame









                 

                                                                                                
    Applications:
    Commissioning
    Annual E2E
    Machine QA
    Patient QA


    Modalities:  
    SRS
    SBRT
    CyberKnife
    GammaKnife
    IMRT
    VMAT
    RapidArc
    Halcyon 
    MR-Linac
    Proton Therapy
    Heavy Ion Therapy


    Unique for:
    Multiple brain metastases



    Specifications:
     
    1. Resolution: 

    (0.5mm)^3 voxel


    2. Dosimetric accuracy
    (at 95% confidence): 
    0.5% relative 
    2% absolute 

    3. Sphere diameter (OD):

    166 mm standard
    230 mm max

    4.  Wall thickness: 2-3 mm

    5. Active diameter: 
    Sphere's OD less 20 mm



    QAbyMail ™ Service Description: 

    1. Customers return exposed CrystalBalls and DICOM files to 3D Dosimetry Lab for laser CT scanning and QA analysis. 

    2. High-definition 3D QA reports are returned by email. 

    3. Reports may be customized but normally include:

    a. Volume histograms & passing rates of 3D gamma; 

    b. Volume histograms and voxel statistics for: 

    i. Dose Difference

    ii. Distance-to-Agreement

    c. Detected shifts of dose cloud's center of mass

    d. Overlays of planned vs measured:

     i. 3D and 2D isodoses

    ii. Profiles

    iii. Dose-Volume histograms

    e. Interactive 3D maps of:
     
    i. Dose Difference

    ii. Distance-to-Agreement

    iii. 3D gamma                                                                                                                                                                                                                             

      

    EXAMPLE  RESULTS
    Overlay of 3D isodose surfaces (here shown at 70% isodose level)
    QAbyMail
    Coronal frontal view of overlaid 3D isodose surfaces (VMAT of six brain metastases, PTV#4)
    QAbyMail
    Overlay of 2D (sagittal left) isodose lines (VMAT of six brain metastases, PTV#4)
    QAbyMail
    Overlay of I-S profiles (VMAT of six brain metastases, PTV#4)
    3D gamma
    3D gamma histogram for PTV#4 (VMAT of six brain metastases)
    3D DTA histogram for PTV#4 (VMAT of six brain metastases)
    3D Dose Difference histogram for PTV#4 (VMAT of six brain metastases)
    QAbyMail
    CrystalBall™ 3D QA report summary for one PTV in a six brain-metastases VMAT
    Proton Therapy QA
    Proton PBS IMPT. (a) 3D isodose surfaces at 50% dose level. Red - plan, blue - measurement; (b) Coronal isodoses. Solid - plan, dotted - measurement. (c) I-S profile overlay. Red - plan, blue - measurement, yellow - dose difference, magenta - DTA, cyan - 3D gamma.

The CrystalBall™ End-to-End QA detects and measures any and all clinically significant cumulative errors that may originate anywhere during radiation therapy or radiosurgery treatment planning and delivery processerrors that may be located anywhere within the treated volume.