Reliable recognition of malignant white blood cells is a key step in the
diagnosis of haematologic malignancies such as acute myeloid leukaemia.
Microscopic morphological examination of blood cells is usually
performed by trained human examiners, making the process tedious,
time-consuming and hard to standardize. Here, we compile an annotated
image dataset of over 18,000 white blood cells, use it to train a
convolutional neural network for leukocyte classification and evaluate
the network’s performance by comparing to inter- and intra-expert
variability. The network classifies the most important cell types with
high accuracy. It also allows us to decide two clinically relevant
questions with human-level performance: (1) if a given cell has blast
character and (2) if it belongs to the cell types normally present in
non-pathological blood smears. Our approach holds the potential to be
used as a classification aid for examining much larger numbers of cells
in a smear than can usually be done by a human expert. This will allow
clinicians to recognize malignant cell populations with lower prevalence
at an earlier stage of the disease.