11 research outputs found
CheXpert: A Large Chest Radiograph Dataset with Uncertainty Labels and Expert Comparison
Large, labeled datasets have driven deep learning methods to achieve
expert-level performance on a variety of medical imaging tasks. We present
CheXpert, a large dataset that contains 224,316 chest radiographs of 65,240
patients. We design a labeler to automatically detect the presence of 14
observations in radiology reports, capturing uncertainties inherent in
radiograph interpretation. We investigate different approaches to using the
uncertainty labels for training convolutional neural networks that output the
probability of these observations given the available frontal and lateral
radiographs. On a validation set of 200 chest radiographic studies which were
manually annotated by 3 board-certified radiologists, we find that different
uncertainty approaches are useful for different pathologies. We then evaluate
our best model on a test set composed of 500 chest radiographic studies
annotated by a consensus of 5 board-certified radiologists, and compare the
performance of our model to that of 3 additional radiologists in the detection
of 5 selected pathologies. On Cardiomegaly, Edema, and Pleural Effusion, the
model ROC and PR curves lie above all 3 radiologist operating points. We
release the dataset to the public as a standard benchmark to evaluate
performance of chest radiograph interpretation models.
The dataset is freely available at
https://stanfordmlgroup.github.io/competitions/chexpert .Comment: Published in AAAI 201
Convolutional Neural Networks with Transfer Learning for Pneumonia Detection
"Pneumonia is a type of acute respiratory infection
caused by microbes, and viruses that affect the lungs. Pneumonia
is the leading cause of infant mortality in the world, accounting
for 81% of deaths in children under five years of age. There are
approximately 1.2 million cases of pneumonia in children under
five years of age and 180 000 died in 2016. Early detection of
pneumonia can help reduce mortality rates. Therefore, this paper
presents four convolutional neural network (CNN) models to
detect pneumonia from chest X-ray images. CNNs were trained
to classify X-ray images into two types: normal and pneumonia,
using several convolutional layers. The four models used in this
work are pre-trained: VGG16, VGG19, ResNet50, and
InceptionV3. The measures that were used for the evaluation of
the results are Accuracy, recall, and F1-Score. The models were
trained and validated with the dataset. The results showed that
the Inceptionv3 model achieved the best performance with 72.9%
accuracy, recall 93.7%, and F1-Score 82%. This indicates that
CNN models are suitable for detecting pneumonia with high
accuracy.