ArticleFrontiers in oncology2025
Feasibility of optimal vertex size and spacing for lattice radiotherapy implementation using helical tomotherapy.
Article in Frontiers in oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers, 1 of them a synthesis that pooled it.
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Who cites it
5 citing papers in PubMed, 1 synthesis or guideline pooled it.
- Spatially fractionated radiation therapy for bulky tumors: a systematic review of clinical outcomes and dosimetric challenges.Radiation oncology (London, England) · 2026Pooled it
- Implementation of VMAT-based lattice spatially fractionated radiation therapy (SFRT) across linac platforms: Practical considerations for QA and motion management.Journal of applied clinical medical physics · 2026Article
- Spiral volumetric modulated arc therapy enhances peak-to-valley dose contrast for 3D-GRID radiotherapy compared to VMAT and tomotherapy.BMC cancer · 2026Article
- Technical evaluation of non-coplanar lattice radiotherapy: achieving directional VPDR uniformity with a 5-mm leaf width multi-leaf collimator.Frontiers in oncology · 2026Article
- Phantom-Based Dosimetric Comparison of Helical and Fixed-Beam TomoTherapy for Spatially Fractionated Radiotherapy Using GRID and Lattice Target Designs.Technology in cancer research & treatmentArticle
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12 authors.
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Abstract
Purpose: Lattice radiotherapy (LRT), a type of spatially fractionated radiotherapy (SFRT), delivers high dose at specific volumes of lattice structure within the tumor to create a low valley-to-peak dose ratio (VPDR). This study aims to evaluate the feasibility of implementing SFRT using helical tomotherapy and to investigate the effects of vertex size and spacing for attaining the VPDR. Methods: A three-dimensional lattice structure with 3×3×3 vertices was designed in a cheese phantom. Vertex sizes of 0.5 cm, 1.0 cm, and 2.0 cm were assessed, with spacing from 1.0 cm to 5.0 cm. The prescribed dose was set to 20 Gy to the vertices in a single fraction. VPDR was calculated from dose profiles along lines connecting three vertices in the anterior-posterior (AP), lateral (LAT), and superior-inferior (SI) directions. The minimum, maximum, and mean dose for each vertex, as well as conformity, homogeneity and monitor unit (MU) analysis were also performed. Results: VPDR decreased significantly with increasing vertex size and spacing. While the AP and LAT directions showed similar VPDR values, the SI direction consistently exhibited lower VPDR values across all configurations. Vertex sizes of 0.5 cm, 1.0 cm, and 2.0 cm required spacing of at least 3.0 cm, 2.0 cm, and 1.0 cm, respectively, to achieve VPDR values below 0.4. The conformity indices ranged from 1.0 to 4.02, and the homogeneity indices ranged from 1.20 to 1.57 across all configurations. Additionally, the MUs increased with both vertex size and spacing. Conclusions: This study quantitatively analyzed the impact of various vertex sizes and spacings on VPDR in lattice radiotherapy using helical tomotherapy. VPDR decreased with increasing vertex size and spacing, with consistently lower values in the SI direction. These findings provide crucial insights for optimizing LRT plans. The identified relationships between the parameters and VPDR offer a foundation for developing more effective LRT protocols in helical tomotherapy, potentially improving therapeutic outcomes.
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