3 research outputs found
High space-bandwidth in quantitative phase imaging using partially spatially coherent optical coherence microscopy and deep neural network
Quantitative phase microscopy (QPM) is a label-free technique that enables to
monitor morphological changes at subcellular level. The performance of the QPM
system in terms of spatial sensitivity and resolution depends on the coherence
properties of the light source and the numerical aperture (NA) of objective
lenses. Here, we propose high space-bandwidth QPM using partially spatially
coherent optical coherence microscopy (PSC-OCM) assisted with deep neural
network. The PSC source synthesized to improve the spatial sensitivity of the
reconstructed phase map from the interferometric images. Further, compatible
generative adversarial network (GAN) is used and trained with paired
low-resolution (LR) and high-resolution (HR) datasets acquired from PSC-OCM
system. The training of the network is performed on two different types of
samples i.e. mostly homogenous human red blood cells (RBC) and on highly
heterogenous macrophages. The performance is evaluated by predicting the HR
images from the datasets captured with low NA lens and compared with the actual
HR phase images. An improvement of 9 times in space-bandwidth product is
demonstrated for both RBC and macrophages datasets. We believe that the
PSC-OCM+GAN approach would be applicable in single-shot label free tissue
imaging, disease classification and other high-resolution tomography
applications by utilizing the longitudinal spatial coherence properties of the
light source
Label-free non-invasive classification of rice seeds using optical coherence tomography assisted with deep neural network
Identification of the seed varieties is essential in the quality control and high yield crop growth. The existing methods of varietal identification rely primarily on visual examination and DNA fingerprinting. Although the pattern of DNA fingerprinting allows precise classification of seed varieties but fraught with challenges such as low rate of polymorphism amongst closely related species, destructive method of analysis and a huge cost involved in identification of robust markers such as simple sequence repeat (SSR) and single nucleotide polymorphisms. Here, we propose a fast, non-contact and non-invasive technique, deep learning assisted optical coherence tomography (OCT) for subsurface imaging in order to distinguish different seed varieties. The volumetric dataset of, (a) four rice varieties (PUSA Basmati 1, PUSA 1509, PUSA 44 and IR 64) and, (b) seven morphologically similar seeds of rice landrace Pokkali was acquired using OCT technique. A feedforward deep neural network is implemented for deep feature extraction and to classify the OCT images into their relevant classes. The proposed method provides the classification accuracy of 89.6% for the dataset of total 158,421 OCT images and 82.5% in classifying the dataset of total 56,301 OCT images collected from Pokkali seeds. The current technique can accurately classify seed varieties irrespective of the morphological similarities and can be adopted for the removal of varietal duplication and assessment of the purity of the seeds