Skip to Main content Skip to Navigation
Preprints, Working Papers, ...

Sigmoid function based intensity transformation for parameter initialization in MRI-PET Registration Tool for Preclinical Studies

Abstract : Images from Positron Emission Tomography (PET) deliver functional data such as perfusion and metabolism. On the other hand, images from Magnetic Resonance Imaging (MRI) provide information describing anatomical structures. Fusing the complementary information from the two modalities is helpful in oncology. In this project, we implemented a complete tool allowing semi-automatic MRI-PET registration for small animal imaging in the preclinical studies. A two-stage hierarchical registration approach is proposed. First, a global affine registration is applied. For robust and fast registration, principal component analysis (PCA) is used to compute the initial parameters for the global affine registration. Since, only the low intensities in the PET volume reveal the anatomic information on the MRI scan, we proposed a non-uniform intensity transformation to the PET volume to enhance the contrast of the low intensity. This helps to improve the computation of the centroid and principal axis by increasing the contribution of the low intensities. Then, the globally registered image is given as input to the second stage which is a local deformable registration (B-spline registration). Mutual information is used as metric function for the optimization. A multi-resolution approach is used in both stages. The registration algorithm is supported by graphical user interface (GUI) and visualization methods so that the user can interact easily with the process. The performance of the registration algorithm is validated by two medical experts on seven different datasets on abdominal and brain areas including noisy and difficult image volumes.
Complete list of metadatas

Cited literature [32 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01818976
Contributor : Hiliwi Leake Kidane <>
Submitted on : Tuesday, June 19, 2018 - 5:48:09 PM
Last modification on : Monday, March 30, 2020 - 8:41:24 AM
Document(s) archivé(s) le : Tuesday, September 25, 2018 - 9:06:58 AM

File

1806.06469.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : hal-01818976, version 1
  • ARXIV : 1806.06469

Citation

Hiliwi Leake Kidane, Stéphanie Bricq, Alain Lalande. Sigmoid function based intensity transformation for parameter initialization in MRI-PET Registration Tool for Preclinical Studies. 2018. ⟨hal-01818976⟩

Share

Metrics

Record views

146

Files downloads

51