Presentation during qiba copd lung density reference and consistency standards work group call
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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

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

Philip F. Judy

June 8, 2011


COPDGene Reference Standard Model 2 Consistency Standards Work Group Call


Spectral effects Consistency Standards Work Group Call

200 mAs – B31f – 5mm – Varied tube potential


Observations
Observations Consistency Standards Work Group Call

  • 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


Variation of CT numbers of foams in the Gammex Boxes Consistency Standards Work Group Call


120kv 200mAs B31f 0.75mm Consistency Standards Work Group Call


120kv 200mAs B31f 0.75mm Consistency Standards Work Group Call


Observations gammex stack
Observations: Consistency Standards Work Group CallGammex 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


Scanned each box is same location Consistency Standards Work Group Call


Observations comparison scan of stack with scan of single phantom
Observations: Consistency Standards Work Group CallComparison 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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