MOD EPID-MV

QUALIMAGIQ module for a complete and fully automatic QA of the high-energy portal imager used in planar mode

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Connected to the QUALIMAGIQ platform, it takes the EPID-MV+ module only 2 mouse clicks to analyse the DICOM images from performance controls of the high-energy (MV) portal imager in terms of mechanical movements, respect of geometries and field sizes and within the framework of the in-depth control of the quality of the images produced. 

BY FAR THE BEST SOLUTION FOR EPID-MV QA!

This module includes all analyses of the EPID-MV module concerning image quality tested in depth, and supplements them with the following mechanical and geometrical tests:

 

 

  • Pixel size: comparison of dimensions in mm and in pixels of a metal frame (OTP-ALIGN test object).

 

  • 2D mapping of geometrical distortions (OTP-DISTO test object, which is included in the OTP-EPID and OTP-EPID-L test objects.

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  • The mechanical play of the MV imager relative to gantry rotation: movement of the image of a metal ball consolidated with the collimator (OTP-BALL test object), or alternatively 4 metal balls consolidated with the collimator (OTP-CROSS or OTP-ABACUS test objects, the second also enabling precision testing of the variations in source-imager distance relative to gantry rotation).

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  • The mechanical play of the MV imager in relation to its vertical movement: shift of the image of a metal ball consolidated with the couch (OTP-BALL test object or alternatively OTP-ALIGN, the second also enabling measurement of the source-imager distance).

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  • The source-imager distance and the precision of the telemeter: detection of a metal frame (OTP-ALIGN test object).

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  • The field sizes measured on the images produced by the imager: search for an iso-blackening whose level can be parameterised by the user in an over-sampled image so it is no longer contingent upon the sensor’s resolution. 

 

 


 

Specifications

Less than 25 minutes is all the time you need to perform the entire control: installation of the test objects, image acquisition and analysis, editing of 6 different PDF analysis reports and a trend curve for each tested parameter.

 

This module enables you to totally fulfil all requirements of the French National Agency for the Safety of Medicines (ANSM) decision dated 28/02/23 regulating the procedures for quality control of external radiation therapy and radiosurgery devices: points 4B.1.1, 4B.1.2, 4B.1.3, 4B.1.4, 4B.1.5 and 4B.1.6 of the annex.

Associated test objects:

  • OTP-EPID (or OTP-EPID-L) from QUALIFORMED*,
  • EPID-PTW from PTW or LASVEGAS (whichever you prefer) for image quality tests, possibly completed by QUALIFORMED’s OTP-DISTO test object to compensate for the deficiencies of the EPID-PTW and LAS VEGAS test objects to measure geometric distortions with precision,
  • QUALIFORMED’s OTP-ALIGN for the geometric tests of the imager,
  • and last, OTP-BALL** (alternatively OTP-CROSS, OTP-ABACUS or OTP-ALIGN) all from QUALIFORMED for the mechanical tests of the imager.

 

(*): The OTP-EPID (or OTP-EPID-L) test object has been specially developed by QUALIFORMED as a universal phantom, which can be used equally well with « portal » kV imagers as with « portal » MV imagers.

(**): The OTP-PLATE object from QUALIFORMED for ELEKTA and SIEMENS customers, or the OTP-ABACUS from QUALIFORMED for VARIAN customers, are quite handy to conveniently set up the OTP-BALL or OTP-CROSS test objects at the collimator exit.

 

 

 

Resources

You need a user manual? please contact us.

FAQ

Why it is essential to buy this EPID-MV module?

To automate the linac quality control, we use a lot the portal imager like a QA device. So, it's very important to have a comprehensive and accurate QA of the EPID.

ARE the EPID-MV module and phantom from QUALIFORMED the best solution for the EPID QA?

Most the time the other phantoms uses contrast targets with different densities but, unfortunately, with also different diameters.
Due to that situation, detecting or not detecting a contrast target can be effective to the noise or the spatial resolution of the tested imager!
In the EPID phantom from QUALIFORMED, contrast targets are wide (14 mm diameter) and reflect really the contrast capability of the portal imager.
The EPID phantom from QUALIFORMED, is the only phantom using a modern method to estimate the imager spatial resolution: the MTF calculated with the Edge Spread Function. This method is also the only ISO method.
Last but not least, most of the time the other phantoms, designed more than 10 years ago, are adapted to old portal imager technologies and are obsolete with flat panel EPID.

DOES THE EPID PHANTOM NEED TO BE PERFECTLY ALIGNed FOR EACH QC?

No, the EPID phantom have to be aligned on the lasers, but if there are some misalignments of the phantom, rotation or translation, QUALIMAGIQ is able to compute them and automatically correct the position of the ROIs used to measure the different needed signals.

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