Infrared imaging

Eugen Kvasnak, PhD. Department of Medical Biophysics and Informatics

3rd Medical Faculty of Charles University

Herschel 1800 - thermal radiation of the sun

IR radiation - longer wavelength than light

- mostly heat effects

- invisible, not ionizing

near IR 0,8 – 25 μm - medical applications

far IR 25 μm – 1 mm – meteorology, astronomy

Transmission principle

• IR laser tomography

Emission principle

IR photographythermography liquid crystalsthermovision - b&w

- colour thermovision camera - digital

IR imaging technique

Technical thermography :

noktovision, meteorology

• Medical thermography – thermovision:

• Noninvasive detection of human body energy

• Recording of body surface distribution of temperatures

• no radiation

X thermometry – point temperature recording

Planck’s law Wien law

E = k.T4

Physical principles of thermovision

IR detector – semiconductor InSb - cooling by liquid N2 (-196o C)

Technical scheme of thermovision

Clinical aplication

Inflamatory proceses – joints, soft tissues

Phlebology – vein trombosis

Vascular cancer

Ischemy of the limbs

… Sudeck syndrom

Head zones

Thermoregulation

isothermal areas

37o 40o C

Thank you for your attention!