ESTRO 2024 - Abstract Book

S3893

Physics - Image acquisition and processing

ESTRO 2024

Figure 2: Contoured MIP images (with both ITVGT and ITVMIP), T1w and T2w for sinusoidal (upper four rows) and cos6(x) (lower four rows) models.

Conclusion:

In comparison to 4DCT, 3D T1-weighted and T2-weighted MR images can generate a volume similar to ITV for moving target delineation under the simulated breathing patterns, but yet to be further validated in vivo. However, a proper margin might be necessary to ensure enough coverage.

Keywords: Target delineation, 4DCT, MRI

References:

[1] Keall PJ, Mageras GS, Balter JM, Emery RS, Forster KM, Jiang SB, Kapatoes JM, Low DA, Murphy MJ, Murray BR, Ramsey CR, Van Herk MB, Vedam SS, Wong JW, Yorke E. The management of respiratory motion in radiation oncology report of AAPM Task Group 76. Med Phys. 2006;33(10):3874-900.

[2] Vedam SS, Keall PJ, Kini VR, et al. Acquiring a four-dimensional computed tomography dataset using an external respiratory signal. Phys Med Biol 2003;48:45– 62

[3] Keall PJ, Starkschall G, Shukla H, et al. Acquiring 4D thoracic CT scans using a multislice helical method. Phys Med Biol 2004;49:2053–2067

[4] Cai J, Chang Z, Wang Z, et al. Four ‐ dimensional magnetic resonanceimaging (4D ‐ MRI) using image ‐ based respiratory surrogate: a feasibil-ity study.Med Phys. 2011;38:6384–6394.

[5] Zhang J, Srivastava S, Wang C, Beckham T, Johnson C, Dutta P, Shepherd A, Mechalakos J, Hunt M, Wu A, Rimner A, Li G. Clinical evaluation of 4D MRI in the delineation of gross and internal tumor volumes in comparison with 4DCT. J Appl Clin Med Phys. 2019 Sep;20(9):51-60.

[6] Wong OL, Law MWK, Poon DMC, et al. A pilot study of respiratory motion characterization in the abdomen using a fast volumetric 4D-MRI for MR-guided radiotherapy. Prec Radiat Oncol.2022;6:100–109.

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Digital Poster

Respiratory gated planning of non-small cell lung cancer with new data-driven gated (DDG) PET/CT

Dershan Luo 1 , Tinsu Pan 2

1 MD Anderson Cancer Center, Radiation Physics, Houston, USA. 2 MD Anderson Cancer Center, Imaging Physics, Houston, USA