ESTRO 2024 - Abstract Book

S3970

Physics - Image acquisition and processing

ESTRO 2024

Figure 2: Comparison of in-vivo brain images without VAT (top row) and with VAT (bottom row). First column: Images acquired with readout direction pointing in the posterior direction, Second column: Images acquired with readout direction pointing in the anterior direction, third column: Difference image between readout in posterior and anterior direction, fourth column: distortion map based on an acquired B0 map. VAT is known to induce additional blurring [4] which can be minimized by selecting a large readout bandwidth. A tailored approach which optimizes distortion correction and image resolution needs to be developed per application area.

Conclusion:

VAT is a simple and effective way to reduce in-plane distortion in MR-based RT planning and treatment with limited impact on scan time and image quality.

Keywords: Geometric distortion, MR-based RT

References: [1] Weygand et al, Spatial Precision in Magnetic Resonance Imaging - Guided Radiation Therapy: The Role of Geometric Distortion, Int J Radiation Oncol Biol Phys, Vol. 95, No. 4, 2016 [2] Cho et al. Total inhomogeneity correction including chemical shifts and susceptibility by view angle tilting, Med. Phys. 15(1), 1988 [3] Kolind et al. Quantitative Evaluation of Metal Artifact ReductionTechniques, JMRI 20:487–495 (2004) [4] Butts et al. Reduction of Blurring in View Angle Tilting MRI, MRM 53:418 – 424 (2005)

3224

Digital Poster

Initial Evaluation of a New SGRT System