Presentation during qiba copd lung density reference and consistency standards work group call
This presentation is the property of its rightful owner.
Sponsored Links
1 / 21

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


  • 72 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


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

COPDGene Reference Standard Model 2


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

Spectral effects

200 mAs – B31f – 5mm – Varied tube potential


Observations

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


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

Variation of CT numbers of foams in the Gammex Boxes


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

120kv 200mAs B31f 0.75mm


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

120kv 200mAs B31f 0.75mm


Observations gammex stack

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


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

Scanned each box is same location


Observations comparison scan of stack with scan of single phantom

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.


  • Login