Welcome to Classifications and Online Calculators in Radiology

This site was build along with the Atlas of Radiology Images to support your knowledge in radiology.

You will find here:

that are used in radiology and related fields with free access.


  • Some pages are accompanied by illustrations
  • All pages contain tags for easy navigation

The concept

The concept of this website is based on a previous site that was founded in 2008 and is still up and running. The website is composed as a book, where all sources are properly referenced, according to a good practice in scientific publications.

Didn't find a classification?


    Featured page

    Kerley lines - types

    Kerley lines are named after Peter J. Kerley, a British radiologist, who identified types of septal lines on chest radiographs in patients with congestive heart failure.

    Type Description
    Kerley A lines linear opacities usually 2 - 6 cm long radiating from the hila into the periphery, caused by distention of lymphatic channels between perivenous and peribronchovascular lymphatics
    Kerley B lines short (<2cm) thin horizontal lines extending perpendicularly from the lateral pleural surface in the lung bases, caused by thickening of interlobular septa
    Kerley C lines reticular opacities in the lung bases that represent Kerley B lines en face.


    1. Koga T, Fujimoto K. Kerley’s A, B, and C Lines. New England Journal of Medicine. 2009;360(15):1539–1539
    2. Hodgkinson DW, O’Driscoll BR, Driscoll PA, Nicholson DA. ABC of emergency radiology. Chest radiographs--I. BMJ. 1993 Nov 6;307(6913):1202–6
    3. Sekar T, Swan KG, Vietrogoski RA. A Beeline Through Sir Peter James Kerley’s Life. American Journal of Roentgenology. 2011 Apr;196(4):W375–W379.

    See the page
    Syndicate content