Automates and Organises Quality Assurance in Radiation Therapy and Medical Imaging
MOD PLAN
QUALIMAGIQ software module for an advanced and automatic control of the laser positioning system's alignment on the CT-scanner
With the QUALIMAGIQ platform, the MOD-PLAN module analyzes in just 2 mouse clicks and 10 seconds DICOM images issuing from the OTP-PLAN phantom from QUALIFORMED used in the following controls: advanced control of the alignment of external laser positioning system with the scanner, control of the CT-scanner’s respect of lengths and control of the flatness of the examination table.
Comprehensive quality control requires 3 scanner acquisitions using the OTP-PLAN phantom. The first with the phantom in contact with the examination table and sufficient field of vision to view the entire test object, followed by two additional acquisitions of the phantom aligned on the external lasers; first with a narrow field of vision centered around the central cube of the test object, followed by a wide angle view to capture the entire phantom.
The automated analysis consists in detecting in the scanner images:
- in the first and in the third and last scanner image: the 4 centering crosses contained in the 4 cubes of the OTP-PLAN phantom to compare their relative position in the images with the actual position in the test object. The flatness of the examination table, the CT-scanner’s respect of the distances in the native slices, and the alignment of the external lasers with the CT-scanner’s origin can then be derived from the comparisons,
- in the second zoomed image: the centering cross of the central cube of the OTP-PLAN phantom in order to derive the precise alignment of the origin of the external positioning lasers on the origin of the CT-scanner slices.
Specifications
Less than 10 minutes is all the time it takes to perform the entire control: installation of the test object, image acquisition and analysis, yielding 6 different PDF analysis reports and trend curve for each tested parameter.
This module optimally fulfills all requirements of the French AFSSAPS Decision dated 22/11/07 regulating Quality control (QC) of CT-scanners: points 8.6 and 8.8 of the annex, (Internal and External QC).
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