X-ray principles
Read the topic background here, then explore the labeled visual and structured learning explanations on this page.
Read explanation on this page ↓ See diagram ↓X-ray — on-site reading
This reference extract addresses X-ray, a related subject. It does not cover every part of X-ray principles.. The article introduction is reproduced here, so you do not need to leave MedAtlas to read it. It may not match the latest official medical guidance.
An X-ray is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays. Roughly, X-rays have a wavelength ranging from 10 nanometers to 10 picometers, corresponding to frequencies in the range of 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and photon energies in the range of 100 eV to 100 keV, respectively.
X-rays were discovered in 1895 by the German scientist Wilhelm Conrad Röntgen, who named it X-radiation to signify an unknown type of radiation.
X-rays can penetrate many solid substances such as construction materials and living tissue, so X-ray radiography is widely used in medical diagnostics (e.g., checking for broken bones) and materials science (e.g., identification of some chemical elements and detecting weak points in construction materials). However X-rays are ionizing radiation and exposure can be hazardous to health, causing DNA damage, cancer and, at higher intensities, burns and radiation sickness. Their generation and use is strictly controlled by public health authorities.
How this connects to Radiology and Imaging
Imaging methods differ in what physical signal they record. Radiography and CT measure X-ray attenuation; ultrasound uses returning acoustic echoes, MRI detects magnetic resonance, and nuclear imaging tracks administered radiotracers. Modality choice, interpretation and safety depend on the clinical question.
Text credit: Wikipedia contributors, “X-ray”, original article · authors & revision history · CC BY-SA 4.0. Unmodified opening extract, accessed 24 September 2026. This Wikipedia-derived section is provided under CC BY-SA 4.0; the independent MedAtlas notes and design are separate works.
X-ray principles · visual study map
Scalable vector illustration. Labeled conceptual map, not a precise anatomical, histological or diagnostic image.The wording in this learning map is adapted from the attributed Wikipedia background section below (CC BY-SA 4.0).
What the underlying subject studies
Imaging translates physical interactions into anatomical or functional representations. Radiographs and CT use ionizing radiation, while ultrasound and MRI rely on different physical principles.
How mechanisms and evidence connect
Choice of modality, acquisition technique, contrast, anatomical plane and display settings determine what can be visualized. A single image can be misleading without adjacent views and clinical indication.
How to develop a sound explanation
For learning, identify the tissue or organ, expected normal appearance, imaging physics and limitations. Diagnostic reporting belongs to appropriately qualified professionals.
References and verification (optional)
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NMC official CBME Curriculum 2024 and current regulations index ↗