Report of a Study on IMRT Planning Strategies for Ethmoid Sinus Cancer

Abstract

IMRT strategies for complex head and neck cases, such as ethmoid sinus cancer, can be strikingly different in various aspects, such as beam setup, total number of segments, PTV dose coverage and dose statistics for organs at risks.

Intensity-modulated proton therapy, volumetric-modulated arc therapy, and 3D conformal radiotherapy in anaplastic astrocytoma and glioblastoma

“…The HI represents the homogeneity of the target dose and should be as close to 0 as possible; optimal if D5 equals D95 (see below for definitions) [22]. The IC is an indicator of the target dose distribution, where higher values indicate a greater variability [23].…”

Simultaneous Integrated Boost (SIB) for Nasopharynx Cancer with Helical Tomotherapy

“…Intensity-modulated radiotherapy (IMRT) for NPC and other head-and-neck cancers has been demonstrated to be an effective method for improving the therapeutic ratio [4,5,13,15,19,25,31,32,37,38,40,42]; IMRT gives also the possibility to simultaneously deliver different doses to different volumes in a very efficient way: this approach, named simultaneous integrated boost (SIB), has also some potential for improving the local control through a moderate acceleration of the treatment [15,16,24,39].…”

Comparative study of dose distribution between carbon ion radiotherapy and photon radiotherapy for head and neck tumor

“…Similarly, the IC that refl ects the degree of target dose homogeneity was defi ned as (D 5 − D 95 )/D mean . 15 For all techniques, the normal tissue volumes covered by the 10%, 30%, 50%, 70%, 90%, and 95% isodose levels were calculated and compared. To determine the dose reductions to normal tissue using carbon ion beams, the 95% isodose volume of the carbon ion plan was related to the other isodose levels and treatment planning techniques, and the relative increase in irradiated normal tissue structures according to the different treatment planning techniques and dose levels was evaluated.…”