We have compiled a large and new dataset of COVID-19 CT scans of patients. You can use it at the following link:https://www.researchgate.net/publication/341804692_A_Fully_Automated_Deep_Learning-based_Network_For_Detecting_COVID-from_a_New_And_Large_Lung_CT_Scan_Dataset/stats
Here is an open dataset of 100 segmented axial CT slices from ~60 Italian patients: http://medicalsegmentation.com/covid19 You can find an updated list of Coronavirus (Covid-19) dataset in the following link: https://www.researchgate.net/post/updated_list_Last_updated_July_10th_2020_of_Coronavirus_Covid-19_dataset_and_other_Research_Resources