Scientific discovery · reviewed

X-rays

1895

X-rays made internal structures visible by recording differences in tissue attenuation.

Discovered in 1895, X-rays were quickly used to image fractures and foreign objects. Their diagnostic value is substantial, but ionizing radiation also requires dose control and protection. Dense materials such as bone absorb more of the radiation than surrounding soft tissue, producing contrast on a detector. This made diagnosis possible without surgery, but the same ionizing energy can damage cells, so modern imaging balances useful information against radiation exposure.

Sources

Medical Imaging: From Roentgen to the Digital Revolution, and Beyond — Hedvig Hricak et al., 2018

Concept map · prerequisites lead toward this node; descendants continue outward.

Early radiograph showing the bones of an adult hand — Radiograph of a healthy adult hand, circa 1900. M0019298: X-ray of the hand of a healthy adult, c.1900. Wellcome Collection. Public Domain Mark.

Direct relationships

Vacuum tube→X-raysDischarge tubes provided the apparatus in which X-rays were observed · medium confidence
Wilhelm Röntgen→X-raysReported and characterized X-rays in 1895 · high confidence
X-rays→Early radiographyTurned penetrating radiation into diagnostic photographs · high confidence
X-rays→Computed tomographyProvided CT's measured transmission signal · high confidence