Radiation Protection in Radiotherapy

Centre de Lutte Contre le Cancer
–Nantes Atlantique– Radiation Protection in
Radiotherapy
Albert Lisbona
Medical Physics Department
CLCC Nantes Atlantique
44805 – Saint-Herblain
France
[email protected]

Centre de Lutte Contre le Cancer
–Nantes Atlantique– Radiation therapy
• The lecture is oriented to the patient
optimisation radiation therapy treatment :
– Intensity Modulated Radiation Therapy (IMRT)
• Head and Neck, prostate,
– Respiratory gated radiotherapy
– Image Guided Radiation Therapy (IGRT)
which is not a treatment technique but an
imaging technique used for patient setup

Centre de Lutte Contre le Cancer
–Nantes Atlantique– External Radiotherapy
Dose variations between 5
to 10% to the target
volume can lead to a
significant change in the
local tumor control and/or
in the toxicity
• Random errors
– Human factor
• Systematic errors
– Network, TPS, beam
calibration,...

Centre de Lutte Contre le Cancer
–Nantes Atlantique– IMRT medical Justification
• Medical justification :
– IMRT two objectives :
• Dose limitation to OAR to decrease toxicity,
• Dose escalation to target to increase local control
– Dose limitation to :
• Spinal cord,
• Parotids (to preserve salivary function)
• Rectal wall and bladder wall

Centre de Lutte Contre le Cancer
–Nantes Atlantique– IMRT
• IMRT : to modulate static or rotational xray
beams in order to get a better target
coverage AND a good healthy tissue
sparing
– Prostate cancer
• rectum, bladder,
– H&N cancer
• parotids, cord, oral cavity.