Computed tomography (CT) is an imaging modality that produces a 3-dimensional radiograph. A KUB is a plain frontal supine radiograph of the abdomen. Pulmonary infiltrates can be observed on a chest radiograph. Lung cancer often appears as a solitary pulmonary nodule on a chest radiograph. Osseous fragmentation with joint dislocation seen on radiograph ("acute Charcot"). This assessment may include a chest radiograph and tuberculin skin test. Pneumonia and congestive heart failure are very commonly diagnosed by chest radiograph. A displaced clavicle is easily seen on a radiograph. Usually no apical change is evident on the radiograph. A chest radiograph is frequently used in diagnosis. CT exposes the patient to significantly more ionizing radiation than a radiograph. It is important to superimpose the radiograph on a stable anatomical structures. Metastases often have a characteristic round appearance on chest radiograph. If a person is sufficiently sick to require hospitalization, a chest radiograph is recommended. The affected sinus is partially opacified on radiograph.