تحسين أداء المنظومات الليزرية الخاصة بتحديد مركز الورم السرطاني في التنظير و المعالجة

الملخص EN

The aim of this research is measuring the errors tolerance during identification the tumor centre of conventional laser beam centering technique, in different stages of radiotherapy and diagnosis, starting from CT scanner to TPS, treatment planning system , to simulator ending up in applying treatment on accelerator.

In each stages mentioned above, there are three laser beams come together to determine a virtual centre that matched actual tumor centre.

The coordinate principle must be verified with alignment of the tomography plane isocentre, and if the CT positioning laser is out of tolerance, no patients for radiotherapy treatment planning or simulator should be examined until the source of errors has been determined and corrected.

That means , in radiotherapy application, it is most commonly required that the CT scanner be equipped verifing laser beam.

this ensure that scanned patient geometry can be accurately reproduced on treatment machine.

Usually, marks are fixed on each patient `mask to adjust the position , appropriate of each patient, and retuning during the diagnosis and treatment process, whereas the laser beam is applied on the marks.

The researchers team notice the tuning method coordinates in locating defecting error rate , yet they suggest a new way to adjust and reduce the errors rate and increase the reliability of the treatment , based on replacing marks with special sensors, distributed in the control points.