ESTRO 2024 - Abstract Book

S3841

Physics - Image acquisition and processing

ESTRO 2024

(cm 2 ,

Hand-drawn

CT

scanning-based

FACT (cm 2 , AMR)

Original Shape (cm 2 )

(cm 2 , AMR)

AMR)

Pear

19.80

22.94 (1.159)

19.60 (0.990)

19.98 (1.004)

Strawberry

24.10

23.24 (0.964)

22.63 (0.939)

24.02 (0.997)

Orange

28.27

26.37 (0.930)

26.98 (0.954)

28.29 (1.001)

Lemon

24.19

24.69 (1.023)

22.84 (0.944)

23.94 (0.990)

Mean ± SD

1.019±0.099

0.957±0.022

0.998±0.005

*AMR: Area Matching Ratio, CT: Computed Tomography, FACT: Flashing Automatic Contour Tracing, SD: Standard Deviation

Conclusion:

The FACT method, employing optical capture and dedicated software, offers a potential enhancement in custom cutout creation. A simulation test demonstrated it can provide increased accuracy, improved precision, and more efficient operations, with a goal to improve electron therapy outcomes ultimately. This approach reflects the evolving landscape of innovations in radiation therapy.

Keywords: Electron cutout, Magnification factor

References:

1. Chow, James CL, and Grigor N. Grigorov. "Electron radiotherapy: a study on dosimetric uncertainty using small cutouts." Physics in Medicine & Biology 52, no. 1 (2006): N1.

2. Kofman, L., and J. Chang. "Machine Learning can Improve the Accuracy and Efficiency of Output Factor Estimation for Electron Cutouts." International Journal of Radiation Oncology, Biology, Physics 102, no. 3 (2018): e280-e281.

3. Bassalow, Roustem, and Narinder P. Sidhu. "A 3D technique for simulation of irregular electron treatment fields using a digital camera." Medical Dosimetry 28, no. 3 (2003): 171-174.

4. Purdy, James A. "Electron beam simulation applicators." Medical physics 10, no. 6 (1983): 911-912.

5. Muller ‐ Runkel, R., J. Ovadia, F. Borger, H. Culbert, and B. Rohowsky. "A shaping device for irregular electron fields for the Therac ‐ 20 accelerator." Medical physics 12, no. 1 (1985): 90-92.

6. Plane, J. H., and C. Usher. "A rapid method of production of irregular-shaped fields for use with patients receiving electron radiotherapy." The British Journal of Radiology 63, no. 755 (1990): 882-883.