Automated QA

for helical tomotherapy


RIT is your only source for the tests specified for helical tomotherapy in the TG148 report. These automated QA tests include:

  • Y-jaw divergence/beam centering
  • Y-jaw/gantry rotation plane alignment
  • Gantry angle consistency
  • Treatment field centering
  • MLC alignment test
  • Couch translation/gantry rotation
  • Laser localization
  • Image quality tests (Cheese Phantom)
  • Built in trending and reporting with RITtrend



The Single Vendor Solution
That Performs or Trends EVERY TG-142 Test



RIT for TG-142 enables you to use your EPID for many machine tests with confidence and ease.  In addition, imaging QA phantoms are automatically scored with easy to use tracking and trending functions.



  • IGRT Daily QA
  • CBCT imaging for OBI and XVI
  • Planar kV Imaging
  • Planar MV (EPID) Imaging
  • Specialized MLC tests for Varian and Elekta machines
  • EPID based Stereotactic alignment (Winston-Lutz)
  • EPID based Radiation vs. Light Field tests
  • Beam profiles / Flatness / Symmetry
  • Starshots and more


3D Winston-Lutz

RIT’s new 3D EPID based Stereotactic alignment routine automatically processes a set of Winston-Lutz images to give a fast, accurate measurement of isocenter position. RIT’s version of this classic test allows you to use 3-10 images and provides an error estimate to determine the wobble around the isocenter. Results are easy to interpret and can be done with any field shape, size, and any ball bearing phantom. Links to possibly Sam’s presentation, or a quote from Sam, as well as screen caps. Watch the video...







Radiation vs. Light Field

This routine measures how well radiation and light field positions coincide for conformance with TG-142 recommendations. The routine can be used with a variety of phantoms including the RIT L-Rad phantom. The routine can make use of EPID images of the radiation field and can adapt to a variety of SIDs, asymmetric and custom field sizes. Besides radiation- light field coincidence the routine measures field symmetry and flatness, penumbra width, and field edge orthogonality in vertical and horizontal directions. Watch the video...


Star Shot

This classic routine measures the mechanical alignment of the gantry, the collimators, and the table. It automatically finds the starshot beam centers and edges to calculate misalignment using a variety of measures. EPID images of several spokes can be easily combined to analyze star patterns with the built-in Image Compositor tool.







Beam Measurements

RIT Software makes a variety of beam-related measurements easy, and supports the widest variety of image formats including EPID, film, and CR.


Functions include:

  • Beam orthogonal profiles including FWHM, penumbras, flatness and symmetry
  • Beam depth profiles including PDD for photons and Electron energy
  • Isodose measurements
  • Asymmetric beam alignment tests
  • Various histograms and 3D dose profiles
  • Import of water tank data for comparison



RIT Software contains fully automated test routines specifically designed to measure critical TomoTherapy machine parameters.


Parameters include:

  • Beam Planarity and Jaw Twist: This routine automatically measures the jaw offset and twist from beams projected from 0 and 180 degrees.
  • Overhead Laser Position Test: This test automatically measures the alignment of the transverse and sagittal laser lines with the beam along with suggested adjustments to the offset and angle of the transverse laser line.



Cyberknife Alignment Test: Automatically measure the alignment of the laser and the beam with this test.