Automates and Organises Quality Assurance in Radiation Therapy and Medical Imaging
QUALIMAGIQ module for an advanced and fully automatic image QA of a linac's CBCT imager or of a CT-scanner
Connected to the QUALIMAGIQ platform, it takes the MOD-CTP module only 2 mouse clicks to analyse the numerous DICOM slices originating from the sections of the CATPHAN phantoms acquired for the advanced controls of the image quality of a CT-scanner or an IGRT installation used in 3D KV or CBCT mode
These automated analyses cover:
- Sensitometry with 8 or 4 different reference materials;
- The water signal;
- Signal uniformity and homogeneity;
- Spatial resolution with 2 methods FTM:
- the Droege and Morin method in a bar pattern comprising 21 or 15 spatial frequencies;
- the PSF method;
- Geometric distortions;
- Low level contrast resolution with intra and/or sub slice patterns;
- The effect of partial volume;
- Slice thickness for slices >= 0.25 mm;
- Sensitivity profiles;
- Pixel size;
- Alignment of the offset internal lasers (biopsy) or not.
Less than 10 minutes is all the time you need to perform the entire control: installation of the phantom, image acquisition and analysis, editing of 6 different PDF analysis reports and a trend curve for each tested parameter.
Associated test objects:
- Either CATPHAN 500, 503, 504, 600 or 604 from Phantom Laboratory.
IS IT ESSENTIAL TO ALIGN PERFECTLY THE CATPHAN PHANTOM IN THE CT-SCANNER BEFORE TO MAKE ACQUISITION?
No for 2 reasons:
1- QUALIMAGIQ detects automatically phantom edges and its orientation before to extract the signal in the different inserts. Therefore QUALIMAGIQ compensates an eventual transversal (Up/Dowm and Left/right) misalignment.
2- The longitudinal alignment of the phantom is also not essential because with one click in the QUALIMAGIQ welcome screen you can redefine the 0 slice location of the complete set of images.
In the CATPHAN phantom, there is two methods to measure the spatial resolution of the CT-scanner. Which is the best method and which method QUALIMAGIQ supports?
Yes CATPHAN offers you to test the spatial resolution with a bar pattern phantom containing 21 different frequencies. Initialy the method was a visual method but DROEGE & MORIN have proposed to quantify the MTF by measuring the standard deviation in each bar pattern. This method is only an approach of the MTF and she is not really accurate for low frequencies.
You have also the possibility to evaluate the MTF directly by calculating the the Fourier transform of the Point Spread Function simulated by a 0.25 mm diameter aluminium ball. This method is also not perfect because she is sensitive to the noise and the MTF estimated with this method is limited by Nyquist frequency.
Nevertheless QUALIMAGIQ supports the two methods.
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