By use of a simple apparatus, the oblique projection can be standardized and thus enhance complete roentgenographic examination of the chest. Ideally, similar apparatus could be applied to the fluoroscopic arm and screen, so that any desirable view in fluorescence could be duplicated in the roentgenogram. The proper and complete use of standard projections can provide valued information, and
... [Show full abstract] often make unnecessary the resort to complex and costly forms of examination.