RTK/Meetings/OnImageQualityInStaticCBCT

Date

Friday, July 31, 2015

Venue

• Salle Marcel Dargent, 2ème étage, centre Léon Bérard, Lyon, France. The room has a videoconference equipment.
• Information on how to come to the Léon Bérard center is available here.
• Hotels: there are a few options around at a walking distance of the Léon Bérard center, any option along the metro line metro D is good.

Attending

• Simon Rit, CREATIS, Lyon, France
• Jean Michel Létang, CREATIS, Lyon, France
• Gloria Vilches Freixas, CREATIS, Lyon, France
• Philipp Steininger, radART / MedPhoton, Salzburg, Austria
• Sébastien Brousmiche, IBA, Louvain-La-Neuve, Belgium
• Jonathan Mason, Edinburgh, UK
• Geoff Hugo, VCU, USA
• Yu Liu, ETHZ, Switzerland
• Mathieu Dupont, CPPM, France
• Thibault Notargiacomo, Thales, France

Problems addressed

• Detector lag
• Scatter glare
• Patient scatter
• Beam hardening
• Statistical noise
• Geometric calibration

Agenda

• 9h00 - Welcome coffee, round table
• 9h30 - Presentation of cone-beam CT systems, review of characteristics (x-ray source, flat panel, geometry)
• 10h00 - Summary of artefact sources

• 10h45 - Break
• 11h00 - Detector effects (lag and glare)
• 11h45 - Beam hardening

• 12h30 - Lunch

• 13h30 - Scatter
• 14h45 - Quantum noise
• 15h30 - Break
• 16h00 - Discussion (summary and action points)

Existing RTK solutions

• Look up table for linearizing input projection values, see, e.g., this work
• Boellaard's scatter correction algorithm
• Empirical cupping correction
• Scatter glare removal
• Lag correction
• Windowing in the ramp filter
• Iterative reconstruction algorithms

State-of-the-art algorithms that are missing

• Savitzky–Golay filter

Solutions under development / Being investigated

• Monte Carlo scatter correction (Simon Rit)