ESTRO 2024 - Abstract Book

S3957

Physics - Image acquisition and processing

ESTRO 2024

DL reconstructed MR images produce high quality images with short acquisition times in the radiotherapy position. Delineators rated the DL image quality substantially better for the prostate and seminal vesicles, with a corresponding reduction in delineation time for the seminal vesicles, although there was no change in inter-observer delineation variability. Automatic contours of reasonable quality were produced on both images, with no difference in rating or editing time. Using automatic contours was significantly faster, with a median time-saving of 10 minutes. In conclusion, DL reconstructed MR images provide superior image quality and a reduced acquisition time. This improves prostate and seminal vesicle visibility for manual delineation, although has no impact on automatic contours.

Keywords: Autosegmentation, image quality, prostate

References:

1.

Khoo V, Joon D. New developments in MRI for target volume delineation in radiotherapy. Br J Radiol.

2006;79(SP1):S2-15.

2. McJury M, O’Neill A, Lawson M, McGrath C, Grey A, Page W, et al. Assessing the image quality of pelvic MR images acquired with a flat couch for radiotherapy treatment planning. Br J Radiol. 2011;84(1004):750–5.

3. Wyatt JJ, Howell E, Lohezic M, McCallum HM, Maxwell RJ. Evaluating the image quality of combined positron emission tomography-magnetic resonance images acquired in the pelvic radiotherapy position. Phys Med Biol. 2021 Jan;66(3):035018. 4. Knoll F, Hammernik K, Zhang C, Moeller S, Pock T, Sodickson DK, et al. Deep-Learning Methods for Parallel Magnetic Resonance Imaging Reconstruction: A Survey of the Current Approaches, Trends, and Issues. IEEE Signal Process Mag. 2020 Jan;37(1):128–40.

2979

Digital Poster

The Impact of Distortion Correction Brainlab software in Vestibular Schwannomas Radiosurgery

Lucas Delbem Albino, João Gabriel Ribeiro, Karen Pieri Bueno, Ernesto Roesler, Matheus Fernando Santos, Luccas Moreira Alves

Real Hospital Português, Radiotherapy, Recife, Brazil

Purpose/Objective:

Although they are benign tumours, vestibular schwannomas pose a challenge in clinical practice due to their critical location close to the vestibulocochlear nerve. These tumours often present with neurological symptoms such as hearing loss, dizziness and imbalance, which have a significant impact on patients' quality of life. Effective treatment of vestibular schwannomas is essential, and one approach that has proven effective in recent years is radiosurgery[1].