Valais/Wallis AI Workshop

The 7th edition of the Valais/Wallis AI Workshop will take place on Nov. 15 2021 at the IDIAP research institute with a live youtube streaming (hybrid event).

Organized by IDIAP and HES-SO Valais, it will feature various presentations and discussions on “Energy in all its artificial states”, including a keynote presentation by Pr Guglielmina Mutani.

Full program and registration are now available online:

3 papers accepted at MICCAI workshops

We will be presenting our two papers on Head and Neck tumor segmentation and prognostic prediction, and one paper on colorectal cancer detection in whole slide images at MICCAI workshops Sept. 27th and Oct. 1st. Together with our paper at the main conference and the organization of the HECKTOR challenge, we are happy to have a total of five great contributions to MICCAI this year.

3D multi-modal (PET/CT) and multi-task architecture with a common down-sampling branch (green), an up-sampling segmentation branch (blue) and a radiomics branch (red).
Example of a manual annotation of primary tumor in blue and the UNet-generated automatic annotation in red on a fused PET/CT image.
Comparison between pixel-wise annotations made by a pathologist with attention maps of MuSTMIL (ours), Hashimoto et al. (2020) MSMIL and SSMIL. Cancer (red), lgd (yellow), hyperplastic poly (blue), normal tissue (orange).

Paper published in Journal of Personalized Medicine

Our review paper on harmonization methods in radiomics, in collaboration with the School for Oncology, Maastricht University, has been published in the Journal of Personalized Medicine.

The paper is now available online: “Making Radiomics More Reproducible across Scanner and Imaging Protocol Variations: A Review of Harmonization Methods“, Shruti Atul Mali et al.

Radiomics aims to extract quantitative features from medical images to improve decision support. In this work, we discuss various harmonization solutions to make the radiomic features more reproducible across various scanners and protocol settings. The different harmonization solutions are divided into two main categories: image domain (including image acquisition, post-processing of raw sensor-level image data, data augmentation, and style transfer) and feature domain (including statistical normalization, intensity harmonization, ComBat and deep learning harmonization).

Overview of harmonization methods at different stages of medical imaging.

Paper accepted in Frontiers in Computer Science

Our paper on “Multi_Scale_Tools: A Python Library to Exploit Multi-Scale Whole Slide Images” by Niccolò Marini et al. has been published in Frontiers in Computer Science, section Digital Public Health.

This paper describes our python library called Multi_Scale_Tools. It includes four components:

  • a pre-processing component with two methods to split the WSIs in patches from arbitrary magnification levels,
  • a CNN-based scale regressor to predict the magnification in a continuous range between 5-40x,
  • two multi-scale CNN architectures to make predictions at patch-level and
  • a multi-scale CNN architecture called HookNet to segment WSIs.

The code is available on GitHub:

An example of WSI format including multiple magnification levels.
An example of tissue represented at multiple magnification level (5x, 10x, 20x, 40x).
An example of the multicenter extraction method.
Overview of a multi-scale CNN architecture.

HECKTOR test data release

The emulation of the HECKTOR challenge at MICCAI2021 is on with many active participants! The test data has just been released and the submission website will be open from Sep. 01 to Sep. 10. We are very much looking forward to your participation !

More info here:

We are very grateful to the HECKTOR 2021 sponsors:

Task 1 (segmentation) is sponsored by Siemens Healthineers Switzerland with a prize of 500 €.
Task 2 (prediction of PFS) is sponsored by Aquilab with a prize of 500 €.
Task 3 (prediction of PFS using ground-truth delineation of tumors) is sponsored by Biomemtech with a prize of 500 €.

Paper accepted at MICCAI 2021

Our paper “Sharpening Local Interpretable Model-agnostic Explanations for Histopathology: Improved Understandability and Reliability” by Mara Graziani, Iam Palatnik De Sousa et. al will be presented at MICCAI 2021, Sept. 27 to Oct 1st, Strasbourg, France.

In this work, we improve the application of LIME to histopathology images by leveraging nuclei annotations. The obtained visualizations reveal the sharp, neat and high attention of the deep classifier to the neoplastic nuclei in the dataset, an observation in line with clinical decision making.
Compared to standard LIME, our explanations show improved understandability for domain-experts, report higher stability and pass the sanity checks of consistency to data or initialization changes and sensitivity to network parameters.

Paper accepted for presentation at MIDL 2021

Our work on “Common limitations of performance metrics in biomedical image analysis” has been accepted for publication in MIDL 2021. Conducted by a large international consortium including the BIAS initiative, the MICCAI Society’s challenge working group and the benchmarking working group of the MONAI framework, this initiative aims at generating best practice recommendations with respect to metrics in medical image analysis.

Full paper available on arxiv:

Paper accepted in IEEE Transaction on Image Processing

Check out our steerable detectors if you lost your (biological) patterns in noisy backgrounds 🙂

A single-shot template learning will allow finding all occurrences no matter their orientation are and with high recall and specificity ! 

And it is obviously all packaged in an open-source ImageJ plugin!

Plus open source code on GitHub:

Joint work with Julien Fageot, Virginie Uhlmann, Zsuzsanna Püspöki, Benjamin Beck and Michael Unser.

HECKTOR 2021 at MICCAI starting soon

The second edition of the HECKTOR challenge will take place at MICCAI 2021 tackling the Head & Neck tumor analysis in PET-CT images. Visit the challenge page for full description:

In addition to last year’s challenge, we will include more data for the segmentation task as well as a new task for the automatic prediction of patient outcome.

Evaluate your cutting edge algorithm on 300 cases with high-quality annotations from six centers.


  • Release date of the training cases: June 1 2021
  • Release date of the test cases: Aug. 1 2021
  • Submission date(s): opens Sept. 1 2021 closes Sept. 10 2021
  • Release date of the results: Sept. 15 2021
  • Associated workshop days: Sept. 27 2021 or Oct. 1 2021

Paper on scale invariance in deep learning accepted in MAKE journal

Our work “On the Scale Invariance in State of the Art CNNs Trained on ImageNet”, by Mara Graziani, Thomas Lompech, Henning Müller, Adrien Depeursinge and Vincent Andrearczyk. was published with open access rights in a special issue of the Machine Learning and Knowledge Extraction (MAKE) journal:

By using our tool Regression Concept Vectors (pip install rcvtool), we modeled information about scale within intermediate CNN layers. Scale covariance peaks at deep layers and invariance is learned only in the final layers.
Based on this, we designed a pruning strategy that preserves scale-covariant features. This gives better transfer learning results for medical tasks where scale is discriminative, for example, to distinguish the magnification level of microscope images of tissue biopses.

HECKTOR 2021 challenge accepted at MICCAI

The second edition of the HECKTOR challenge was accepted at MICCAI 2021. This challenge is designed for researchers in medical imaging to compare their algorithms for automatic segmentation of tumor in Head and Neck Cancer. In addition to last year’s challenge, we will include more data for the segmentation task as well as a new task for the automatic prediction of patient outcome.


  • Release date of the training cases: June 1 2021
  • Release date of the test cases: Aug. 1 2021
  • Submission date(s): opens Sept. 1 2021 closes Sept. 10 2021
  • Release date of the results: Sept. 15 2021
  • Associated workshop days: Sept. 27 2021 or Oct. 1 2021

More information will come soon !

Start of EU project BIGPICTURE

This week took place the kickoff meeting of BIGPICTURE, an EU project gathering about 50 partners including hospitals, research centers and pharmaceutical companies with the aim to create the largest database of histopathology images for computer assisted cancer diagnostic and treatment planning.

Manfredo Atzori, senior researcher and Henning Müller, professor at the Institute of Information Systems, HES-SO

Journal paper accepted in Developmental Cognitive Neuroscience

Our paper on “The development of attentional control mechanisms in multisensory environments” has been accepted for publication in Developmental Cognitive Neuroscience, Elsevier.

This work led by Nora Turoman, Pawel J. Matusz and their colleagues focused on using advanced multivariate EEG analyses to understand how children develop their attentional control in real-world like settings and when different processes that underlie this attention control reach the adult-like state.

Workshop on Interpretable AI for Digital Pathology at AMLD 2021

Deep learning models may hide inherent risks: codification of biases, weak accountability and little transparency of the decision-making. 

Our workshop at AMLD2021 (Building Interpretable AI for Digital Pathology) offers an all-round discussion on building interpretable AI for digital pathology.

Join us to hear about visualization methods, concept attribution and interpretable graph-networks.