A hybrid 2D/4D-MRI methodology using simultaneous multislice imaging for radiotherapy guidance.

ABSTRACT:

Purpose

Respiratory motion management is important in abdominothoracic radiotherapy. Fast imaging of the tumor can facilitate multileaf collimator (MLC) tracking that allows for smaller treatment margins, while repeatedly imaging the full field-of-view is necessary for 4D dose accumulation. This study introduces a hybrid 2D/4D-MRI methodology that can be used for simultaneous MLC tracking and dose accumulation on a 1.5 T Unity MR-linac (Elekta AB, Stockholm, Sweden).

Methods

We developed a hybrid 2D/4D-MRI methodology that uses a simultaneous multislice (SMS) accelerated MRI sequence, which acquires two coronal slices simultaneously and repeatedly cycles through slice positions over the image volume. As a result, the fast 2D imaging can be used prospectively for MLC tracking

SUBMITTER: Keijnemans K 

PROVIDER: S-EPMC9545880 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature