The Effect of the Film-to-Focus Distance (FFD) Method on the Optical Density of the Organs and Anatomical Interest Parts in the Thoracic Cage. njap [Internet]. 2025 Sep. 14 [cited 2025 Dec. 21];1(1):40-7. Available from: https://njap.nipngr.org/index.php/njap/article/view/19