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Presentation during QIBA COPD Lung Density Reference and Consistency Standards Work Group Call

Presentation during QIBA COPD Lung Density Reference and Consistency Standards Work Group Call. Philip F. Judy June 8, 2011. COPDGene Reference Standard Model 2. Spectral effects 200 mAs – B31f – 5mm – Varied tube potential. Observations.

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Presentation during QIBA COPD Lung Density Reference and Consistency Standards Work Group Call

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  1. Presentation during QIBA COPD Lung Density Reference and Consistency Standards Work Group Call Philip F. Judy June 8, 2011

  2. COPDGene Reference Standard Model 2

  3. Spectral effects 200 mAs – B31f – 5mm – Varied tube potential

  4. Observations • CT numbers inside the phantom of foams identified by NIST are sensitive to spectral differences • CT number air inside the phantom is less sensitive to spectral differences than foams identified by NIST • CT number of acrylic inside phantom may useful characterizing the spectral effects on CT number inside the phantom

  5. Variation of CT numbers of foams in the Gammex Boxes

  6. 120kv 200mAs B31f 0.75mm

  7. 120kv 200mAs B31f 0.75mm

  8. Observations:Gammex Stack • Substantial variation CT number of densest foam (-684) from sample to sample. • Variation caused by mAs and reconstruction kernel less than 1 HU • Limitation: Variation could be associated with spatial variation • Unexplained effect at lowest foam density

  9. Scanned each box is same location

  10. Observations: Comparison scan of stack with scan of single phantom • Still is substantial variation CT number of densest foam (-684) from sample to sample. • Systematic effect observed. • Limitation: Effect could be associated with difference reconstruction field of view.

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