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Nityanand gopalika digital radiography performance study

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Presentation by Nityanand Gopalika on Digital Radiography Performance Study - paper presentaed at NDE 2003 conference.

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Nityanand gopalika digital radiography performance study

  1. 1. Digital Radiography-A Performance study for industrial applicationV.Manoharan, Gopalika Nityanand, and Debasish Mishra Industrial Imaging and Modeling Lab Imaging Technologies John F Welch Technology Center Bangalore
  2. 2. Benefits of Digital RadiographyProductivity1. Faster response2. Elimination of chemical processing3. Automated inspection4. Elimination of retakesCost• Elimination film and consumables• ROI in two to three yearsQuality• Image processing and analysis• Reduces operators fatigue• ConsistencyAdvanced Application• Volumetric CT for High Throughput Productivity and cost benefits
  3. 3. System configurations under studyDXR-500 Digital Radiography system Detector and data acquisition systems Model:DXR-500 Make: GE Inspection technologies Type: a-Si based Indirect conversion Scintillator:CsI Pixel pitch:100 microns No of pixels: 2304 X 1920 X-ray Source Model: KA 160 Make:Kevex Focal spot: 0.4,.25,.065,.01 mm Max kV: 160 mA: 1 CsI needles structure How it works? Advanced medical technologies for Industrial applications
  4. 4. Performance study-Radiation exposure response DXR-500 DR system 14000 12000 Signal(ADC) 10000 8000 6000 4000 2000 Min and Max exp ratio >12 0 0 5 10 15 20 25 30 35 Relative exposureComparative study Useful exposure range Industrial X-ray film Min and Max exp ratio 2Characteristics DXR-500 Digital Detector ( Medium speed) • Productivity: In the order of few mR to get 1.3 R to get Optical Speed signal level of 12000 density of 2 • High Speed (mR vs R) Useful minimum to Useful minimum to • Minimized ReworkDynamic range maximum exposure maximum exposure ratio 12 ratio 2 • High Latitude CoverageTypical Exposure ratio requirements • Advantages X-ray tube Subject • Less radiation fieldMaterial Lattitude potential contrast • Micro focus (Faster response Ti 3 to 20 mm 160 kV 12.7 enables high definition Steel 1 to 10 mm 160 kV 7.28 radiography) Detector characteristics suitable for industrial applications
  5. 5. Performance study-Noise response • Poisson distributed noise • Noise Quantum limited • Averaging of frames reduces noise Effect of no. of frames 1 frame 5 framesEffect of no. of X-ray photons 1 Mas 10 frames 5 Mas 25 frames Quantum limited Noise performance
  6. 6. Performance study-Spatial resolution • Observation: • System can be designed to match with film MTF. • Digital detector with mini/micro focal tube outperforms film radiography with large focal spots. • DQE of DXR-500 is comparatively good. (DQE is a better Image quality metric than MTF)System can be designed to meet IQ requirements
  7. 7. Performance study-IQI sensitivityMat. – Ti Mat. – Ti Mat. – SS Mat. – AlThick. – 25mm Thick. – 10mm Thick. – 10mm Thick. – 40 mmKvp – 120 Kvp – 120 Kvp – 140 Kvp – 120mAs – 1.0 mAs – 1.0 mAs – 1.0 mAs – 1.0FS – 0.4 mm FS – 0.4 mm FS – 0.4 mm FS – 0.4 mm 2-1T sensitivity over range of thickness
  8. 8. Performance study-Imaging 2-2T Sensitivity Porosity Lack of penetrationKvp – 125mAs – 1.0FS – 0.4 mmMat. – CSTech. - SWSI Kvp – 125 Mat. – CS mAs – 1.0 Tech. - DWDI FS – 0.4 mm Range of applications with 2-1T sensitivity
  9. 9. Performance study-Imaging Object – IC Kvp – 70 mAs – .5 FS – 10 microns Mag. – 50X Object – IC Object –ceramics Kvp – 70 Kvp – 70 mAs – .5 mAs – .5 FS – 10 microns FS – 10 microns Mag. – 50X Mag. – 50XEnable high definition radiography
  10. 10. Performance study-Conclusion• Faster response and wide dynamic range• Quantum limited noise performance• System can be designed to meet image quality requirements• 2-1T sensitivity over range of thickness• Range of applications with 2-1T sensitivity• Enables high definition radiography

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