Thanks for your time for me. My query is on the radiation therapy process for a cancer patient.
How radiation simulation and marking process is done prior to radiation therapy for a cancer patient?
Any kind of explanatory video /animation/ documents from the basic level is best for me to understand it as I have absolute zero knowledge about the whole process.
Regards,
Bhaskar
Thank you sir Sven C Beiersdorf,
Your answer was helpful in view of my query but could you please explain the background of how the laser position light source works according to the tumour position and movement?
Thanks.
Hello
the objective of lasers is to mark the position of the isocenter on the skin or on the contention of the patient who will be treated.
Practically, the CT scan is performed and then the physician delineate the target tumour on the TPS (treatment planning system). The isocenter is then put at the centroid of the delineated tumour, and the coordinates are exported to the laser system. Laser sources move automatically to the right position and the patient, who still is on the scanner couch, is tattooed at this precise location.
The aim is just to ensure that the patient will be placed at the same place under the LINAC than during virtual simulation.
This process has nothing to do with potential movement of the patient or of the tumour.
Such movements are managed using either dedicated imaging tools on the LINAC (2D or 3D) or respiratory management systems for tumours that naturally move (typically lungs, liver).
Thank you Nicolas sir for your help.
Could you please suggest some resources from where I can get ideas about respiratory management systems from the basic level.
Hi, the AAPM Task Group 76 report outlines how respiratory motion should be managed clinically. This may be useful for you.
Take a look at the IAEA website, http://www-naweb.iaea.org/nahu/DMRP/slides.html, there is a lot of information available about "Dosimetry and Medical Radiation Physics (DMRP)".
There is a chapter on treatment planning, http://www-naweb.iaea.org/nahu/DMRP/documents/slides/Chapter_07_Treatment_planning.pdf.
(And there are textbooks ...).
Do you have a specific project in mind?
Hello,
here are some devices specifically dedicated to respiratory monitoring:
Dyn'R
Vision RT
Varian RPM
Catalyst from C-rad
Anzai respiratory gating
You will find some interesting information on their respective websites.
goto google and type in:
radiotherapy simulation and select videso!
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