Static Dynamic MLC
RIT113 IMRT QA Software » Static Dynamic MLC

RIT113 gives you measurement solutions to the unique set of problems associated with Static and Dynamic MLC treatments such as leaf leakage, leaf position, leaf transmission, position accuracy, leaf synchronization, leaf speed, and beam-on delay. With its high spatial resolution, dose level resolution, ability to integrate dose at multiple points over time, automated analysis routines, and quick setup, RIT113 can make short work of performing this suite of QA tests that will give you confidence in your MLC treatments. These tests can be used during commissioning and on a routine basis because they are fast, accurate, and easy to use, and you will be meeting the recommendations in "Guidance document on delivery, treatment planning, and clinical implementation of IMRT: Report of the IMRT subcommittee of the AAPM radiation therapy committee" which specifies that IMRT QA protocol should include use of an MLC test pattern analysis that can be done at any gantry and collimator angle(s).

V5 now allows you to view multiple analyses simultaneously with the new user interface. See Customizing Your User Interface.

Bayouth MLC Analysis

Bayouth MLC Analysis

MSK Test Pattern (TG53)

MSK TestPattern (TG53)

MLC Transmission Analysis

MLC Transmission Analysis
 

MLC 50% Fluence Analysis (TG50)

MLC 50% Fluence Analysis (TG50)

Varian DMLC QA Test Patterns

Varian DMLC QA Test Patterns

This routine measures leaf position, field junctions, FWHM, and spatial difference histograms.

"MLC quality assurance techniques for IMRT applications", J.E. Bayouth, et, al, Med. Phys 30 (5) May 2003 pp. 743-750.

This simple Memorial Sloan Kettering test pattern is great for routine QA checks on your MLC to help comply with TG53’s recommendations for treatment planning and delivery. This one test pattern measures stability of leaf speed, effect of lateral disequilibrium on dose profiles between adjacent leaves, significance of acceleration and deceleration in leaf motion, effect of positional accuracy, and leaf shape effects. Performing these tests at different gantry angles ensures that mechanical performance is within tolerance throughout the entire delivery. Leaf errors as small as 0.2 mm are easily resolved.

Chui, Spiridon, Spirou, LoSasso, "Testing of dynamic multileaf collimation", Memorial Sloan-Kettering Cancer Center, Medical Physics 23, May 1996, pp 635-641.

This routine measures the MLC operation as defined in the AAPM TG50 recommendations. For each leaf, the Transmission is reported. The high resolution of the film scanner provides unparalleled accuracy in MLC performance analysis for each leaf in a fraction of the time it would take to perform a single measurement by hand.

This routine tests the MLC operation as defined in the AAPM TG50 recommendations. Position, Transmission, and FWHM are computed automatically for each leaf at each position.

RIT113 automatically analyzes the 9 Varian DMLC test patterns to determine proper MLC operation. Quantitative results as well as Pass/Fail results are reported. These tests evaluate positional accuracy of the leaves, kinetic properties (Including leaf speed stability), leaf acceleration, and fractional dose delivery. This method utilizes test patterns for step-and-shoot and sliding window techniques