Sugawara Y, et al. – Researchers tried to find out the accuracy of an in–house program in lung stereotactic body radiation therapy (SBRT) cancer patients, and explored the prognostic factors associated with the accuracy of deformable image registrations (DIRs). The outcomes highlighted that the pleural attachment status might be an important predictor of deformable image registration accuracy for thoracic images, indicating that there is a potentially large dose distribution discrepancy concerning 4D treatment planning and adaptive radiotherapy.