ESTRO 2023 - Abstract Book

S1549

Digital Posters

ESTRO 2023

cases, and lung- and muscle tissues in lung cases. The average dose discrepancy for bone structures of all cases is also seen in Figure 2 where Dm and Dw deviate by 1% and 5%, respectively. These results agree with those of the simple geometry.

Conclusion Acuros calculates Dm with high accuracy where the largest deviation from PRIMO is 1% for bone tissue. Furthermore, Dm is accurately converted to Dw by Acuros for all tissue types except for bone tissue where simple- and patient geometry show 7% and 5% discrepancy, respectively. Conversion to Dw for adipose was shown to deviate 3% in the simple geometry. Implementing Acuros in clinical practice is encouraged but caution is advised regarding Dw in adipose and bone tissue (e.g., abdominal superficial- and pelvic/spinal SBRT targets).

PO-1820 Feasibility of in vivo diffusion weighted imaging on a 0.35 T MRI-guided linear accelerator