Application of Spatially Fractionated Radiation (GRID) to Helical Tomotherapy using a Novel TOMOGRID Template.

Spatially fractionated radiation therapy (GRID) with megavoltage x-ray beam is typically used to treat large and bulky malignant tumors. Currently most of the GRID treatment is performed by using the linear accelerator with either the multileaf collimator or with the commercially available block. A novel method to perform GRID treatments using Helical Tomotherapy (HT) was developed at the Radiation Oncology Department, College of Medicine, the University of Arkansas for Medical Sciences. In this study, we performed a dosimetric comparison of two techniques of GRID therapy: one on linear accelerator with a commercially available GRID block (LINAC-GRID) as planned on the Pinnacle planning station (P-TPS); and helical tomotherapy-based GRID (HT-GRID) technique using a novel virtual TOMOGRID template planned on Tomotherapy treatment planning station (HT-TPS). Three dosimetric parameters: gross target volume (GTV) dose distribution, GTV target dose inhomogeneity, and doses to regions of interest were compared. The comparison results show that HT-GRID dose distributions are comparable to those of LINAC-GRID for GTV coverage. Doses to the majority of organs-at-risk (OAR) are lower in HT-GRID as compared to LINAC-GRID. The maximum dose to the normal tissue is reduced by 120% for HT-GRID as compared to the LINACGRID. This study indicate that HT-GRID can be used to deliver spatially fractionated dose distributions while allowing 3-D optimization of dose to achieve superior sparing of OARs and confinement of high dose to target.

Zhang X ，Penagaricano J ，Yan Y ，Sharma S ，Griffin RJ ，Hardee M ，Han EY ，Ratanatharathom V ... -  《-》

Spatially fractionated radiotherapy (GRID) using helical tomotherapy.

Zhang X ，Penagaricano J ，Yan Y ，Liang X ，Morrill S ，Griffin RJ ，Corry P ，Ratanatharathorn V ... -  《Journal of Applied Clinical Medical Physics》

Treatment plan comparison between helical tomotherapy and MLC-based IMRT using radiobiological measures.

Mavroidis P ，Ferreira BC ，Shi C ，Lind BK ，Papanikolaou N ... -  《PHYSICS IN MEDICINE AND BIOLOGY》

Intensity-modulated radiation therapy (IMRT) dosimetry of the head and neck: a comparison of treatment plans using linear accelerator-based IMRT and helical tomotherapy.

Sheng K ，Molloy JA ，Read PW 《INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS》

Helical tomotherapy for head and neck squamous cell carcinoma: dosimetric comparison with linear accelerator-based step-and-shoot IMRT.

Murthy V ，Master Z ，Gupta T ，Ghosh-Laskar S ，Budrukkar A ，Phurailatpam R ，Agarwal J ... -  《-》