Magnetnoresonančni simulator za potrebe načrtovanja obsevanja Magnetic resonance simulator for the radiotherapy planning

Abstract

Uporaba magnetnoresonančnega (MR) slikanja v radioterapiji (RT) predstavlja številne uporabne prednosti v procesu izdelave obsevalnega načrta. Pri MR slikanju se predvsem izkorišča boljša kontrastnost in prostorska ločljivost mehkih tkiv v primerjavi s slikanjem z računalniško tomografijo (CT). V prispevku je opisan postopek MR slikanja v procesu RT in predstavljene so razlike med diagnostičnim in radioterapevtskim MR aparatom ter opisane kontraindikacije samih MR preiskav. Namen MR slikanja je pridobitev in zlitje s serijo CT slik, natančno določenega anatomsklega področja v specifičnem radioterapevtskim položaju s pomočjo ustreznih fiksacijskih pripomočkov in tuljav, ki se uporabljajo v procesu RT. Tako zlitje MR in CT slik omogoča natančnejšo vrisovanje tumorja in/ali drugih tarčnih struktur ter sosednjih rizičnih organov.

Abstract (Eng)

The use of magnetic resonance imaging (MRI) in process of radiotherapy (RT) planning and treatment is expanding. MRI is very increasingly being used in RT process, cause represent superior soft-tissue contrast compared with computer tomography (CT). Purpose of review is mainly introduce the features of MRI process in RT process and describe differences between diagnostic and therapeutic MR machine. Main goal of MRI examination it is scanning the patient in dedicated special RT position with unique RF coils which is used for imaging in RT process. Most common process is to perform both MRI and CT examination in the treatment position and finally fuse both datasets imaging. These MR images are primarily used to outline the tumour volumes (TV) and organs at risk (OAR).