Surgeons already diagnosed many fractures by deformity, pain, abnormal movement, and palpation. They searched for bullets or needles by examining a wound and, when justified, probing or operating. Those methods could be painful, uncertain, and dangerous near vessels, nerves, or joints. The Liverpool clinicians stopped their search because of important structures in the wrist; the radiograph then supplied a location from outside the body (Carter and Hill; Howell).
The new image was a two-dimensional projection, not a transparent window. A discharge tube had to be driven by high-voltage electrical apparatus; the patient or specimen was positioned between the tube and a fluorescent screen or photographic plate; and the plate then had to be developed. Tube vacuum, distance, exposure, body thickness, plate sensitivity, and processing all changed the result. Early practitioners used additional views or external wires as landmarks because one shadow did not automatically reveal depth (Rowland).
Period writers called the process the “new photography,” skiagraphy (shadow-writing), or Röntgen photography. These terms record a moment before radiography and radiology became settled professional labels. Bone and metal were comparatively conspicuous; many soft-tissue distinctions were weak, inconsistent, or beyond the power of early apparatus. Images had to be compared with symptoms, examination, anatomy, and sometimes the findings of an operation (Archives of Clinical Skiagraphy).