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RTI RAD-DIGIX-4 User Manual

Radiography image quality control
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RAD-DIGIX-4
USER MANUAL
Radiography Image Quality Control

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Summary of Contents for RTI RAD-DIGIX-4

  • Page 1 RAD-DIGIX-4 USER MANUAL Radiography Image Quality Control...
  • Page 2 SAFETY There are no special safety requirements associated with the use of this phantom.

  • Page 3: Quick Start

    QUICK START SET-UP Position the RAD-DIGIX-4 phantom on the patient couch using the patient positioning system and centre markers on the phantom such that the test features are centred in the field of view and the light field matches one of the field sizes marked on the phantom.
  • Page 4 DESCRIPTION The RAD-DIGIX-4 has been designed to meet the quality assurance requirements of digital radiography systems, as set out in DIN 6868-13. The phantom enables the user to perform the following tests in a robust, repeatable fashion: Patient dose - requires additional dosemeter...

  • Page 5: Acceptance Testing

    ACCEPTANCE TESTING Baseline values should be determined when: · A new X-ray system is brought into use (acceptance testing) A new detector/CR reader is brought into use · · Any other factor which may affect image quality is altered The image obtained at acceptance testing should be retained and marked ‘Reference Image’...
  • Page 6 SET UP These tests should be performed using both manual and automatic exposure control, if both are used for patient scans. Tube potential should be set at 70kV, however if this value is unavailable, then 100kV should be selected. The mAs parameter should be set as per manufacturer recommendations (manual control only).
  • Page 7 DOSE Expose the dosemeter into the position marked ‘Dose - Detector Area’. Note: the dosemeter should be exposed in the same position/orientation each time the test is carried out. Record the reading and compare it with previous values for the same exposure settings. Constancy Test Tolerance AEC (70 kV) Al attenuator –...

  • Page 8: Optical Density

    OPTICAL DENSITY This test is only required where x-ray films are used in a clinical setting. Use a densitometer to measure the optical density in the region ‘D ’ on the test image. Compare this with previously recorded values using the same exposure settings. Constancy Test Tolerance Deviation from the baseline should be no greater than 0.30 Acceptance Test Tolerance...

  • Page 9: Spatial Resolution

    SPATIAL RESOLUTION Visually inspect and note those line pair groups where the bars and spaces are all visible (i.e. resolved), and determine the highest spatial frequency that can be resolved in this way. Constancy Test Tolerance The number of resolved groups should be no fewer than that observed on the baseline reference image.
  • Page 10 LIGHT FIELD TO X-RAY FIELD ALIGNMENT Visual inspection of the alignment markings on the test image. Measurements can be made simply using the 5mm markings along the phantom, and geometry can be assessed using the corner and central T-markers. Measurements should be approximately made from the centre of each edge of the image, to the corresponding marker.
  • Page 11 CENTRAL BEAM ALIGNMENT This test is purely visual, and the test is illustrated in the figure (below). The phantom has been designed such that if the circular detail appears to be just touching the annulus detail, then the unit just passes this constancy test as per IEC 61223-2-11: this implies angular deviation of 1.5 from normal.
  • Page 12 GEOMETRY / SCALE (ACCEPTANCE ONLY) Measure the distances between all 4 film markings (either on a film or on a monitor). Acceptance Test Tolerance The distances should not vary by more than 3% of the true value (taking care to account for the image scale).
  • Page 13 RECOMMENDED PERFORMANCE STANDARDS The following suggested remedial and suspension levels are recommended by DIN 6868-13...
  • Page 14 Test Record Sheet Phantom: RAD-DIGI-X-4 serial number ________________________________________________ Machine Details: Manufacturer_______________________________________________________________________ Model_____________________________________________________________________________ Serial Number______________________________________________________________________ Location___________________________________________________________________________ Image Quality Acceptance Constancy Parameter Test Tests Date Date Date Date Date Date Date Date Number of dynamic range steps resolved Number of low contrast details resolved Number of high contrast LP/mm...

  • Page 15: Maintenance

    MAINTENANCE Storage Always keep the phantom in its protective case when not in use to prevent accidental damage. Care Clean the components using a soft, dry, clean cloth, do not use solvents. Maintenance Observe the phantom for physical damage over time. Action is required only in the event that damage is observed.

  • Page 16: Troubleshooting

    TROUBLE SHOOTING PROBLEM CAUSE SOLUTION I can’t see the test features on Incorrect positioning of the Re-position the phantom as per my images phantom the set-up instructions Incorrect exposure settings Check the correct exposure settings, and patient equivalent filtration are present How do I know if my results are Results must be compared to the Consult the machine...
  • Page 17 SOFTWARE Automatic scoring software is not currently available from RTI.
  • Page 18 Man 095g 11/05/20...

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