2021/10/19 by Mazen Moussallem, Pauline Harb, Moussallem, Mazen +6
Medicine · Physics and Astronomy · #Advanced Radiotherapy Techniques #FOS: Physical sciences #Medical Imaging Techniques and Applications #Medical Physics (physics.med-ph) #Radiation Dose and Imaging
paper · pdf · doi:10.48550/arxiv.2110.10089
openalex publication_date 2021/10/19 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
A new strategy for radiation therapy dosimetry planning (RTDP) used to reduce\ndose estimation errors due to respiratory motion in breast treatment was\nillustrated and evaluated in this study. On CT data set acquired for breast\ntreatment, six different RTDP tangential techniques were performed: (i)\nthree-dimensional conformal radiotherapy (3DCRT) with physical wedge, (ii)\n3DCRT with virtual wedge, (iii) motion management technique (MMT) with physical\nwedge, (iv) MMT with virtual wedge, (v) 3DCRT with field-in-field, and (vi)\nintensity-modulated radiation therapy (IMRT) with direct aperture optimization.\nThese anti-motion techniques were considered to generate continuous dose\ndegradation to avoid drastic changes in the delivered doses that involve the\nedge regions of the beams. A comparison was made between the delivered and\nsimulated doses, with and without the presence of motions simulations. This\nstudy demonstrates that techniques without motion management can be affected by\nmotions that can lead to a difference equal to 19 % between the delivered and\nthe planned doses in a point located near to the beams collimators edges, and\nto a difference up to 3 % on multi-leaf collimators (MLCs) edges (gamma pass\nrates were 87.9 % for 3%/3mm). These differences were reduced to 11 % and to\nless than 3 % (gamma pass rates were 100 % for 3%/3mm) when MMT were used. As a\nconclusion, in tangential techniques motion can affect dose estimations on the\nMLCs and beams collimators edges. The proposed MMT reduce this effect to\nestimate the delivered dose accurately.\n