Conveners
Session 2 - Software and Quantification: attenuation correction – part 1
- Dimitris Visvikis (INSERM, France)
Ludovica Brusaferri
(Institute of Nuclear Medicine, UCL, London, UK)
21/05/2018, 11:00
Talk
Emission-based attenuation correction methods aim to derive the attenuation information directly from the emission data. Although promising results have been obtained with this approach, joint-reconstruction of activity and attenuation suffers from several limitations. Nearly all studies report cross-talk between the estimated activity and attenuation distributions if time-of-flight...
Gaspar Delso
(UniversitätsSpital Zürich)
21/05/2018, 11:20
Talk
The goal of the present study was to assess the longitudinal repeatability of a novel bone identification method, based on a convolutional deep network trained to convert LAVA-Flex and zero echo-time MRI data into pseudo-CT density maps. The consistency of the bone maps -with potential applications in attenuation correction of PET data and MR-based radiotherapy planning- was evaluated for a...
Andreas Renner
(Center for Medical Physics and Biomedical Engineering)
21/05/2018, 11:40
Talk
Attenuation correction (AC) is still a challenge in PET/MRI. Without photon transmission sources, methods for AC rely on the segmentation of MR images or the use of dedicated MR sequences. In general, these methods neglect the attenuation of cortical bone, thus, leading to a bias in quantification of tracer concentration in PET images. We have developed a head coil system with an integrated...
Matteo Cencini
(Università di Pisa)
21/05/2018, 12:00
1 - Instrumentation: detectors and electronics
Talk
The ancient Greeks believed that matter was made of a weighted combination of four elements: earth, water, air and fire. Using a similar simplified assumption, we formulated a multi-component MR fingerprinting framework, where every voxel was considered a weighted combination of four base tissues: bone, water, air and fat. We named our approach Aristotelian MR based attenuation correction...
Richard Laforest
(Washington University)
21/05/2018, 12:20
Talk
Attenuation Correction in simultaneous PET/MR was originally implement using a two-point DIXON which neglected the bones. More recent implementations of MR based attenuation strategy in PET/MR involve either a fast UTE or a bone atlas which allows for inclusion of bones. However, soft-tissues are still segmented to provide anatomical attenuation into five compartment identified as air, lungs,...
