Simultaneously integrated boost to multiple brain metastases during whole brain radiation therapy-hippocampal avoidance

Alonso N. Gutiérrez, Wolfgang A. Tomé, Amol Ghia, Sayana Thomas, George Cannon, Deepak Khuntia, John S. Kuo, Minesh Mehta

Resultado de la investigación: Chapter

1 Cita (Scopus)


Purpose: To evaluate the feasibility of delivering a radiosurgery-quality integrated boost to visible brain metastases combined with hippocampal sparing whole brain radiotherapy using helical tomotherapy. Materials and Methods: Ten patients were planned on helical tomotherapy using MR-CT fusion-defined target and normal structure contours. Individually contoured hippocampi were used as conformal avoidance structures and limited to a mean-NTD2 of 6 Gy, where NTD2 denotes the normalized total dose delivered in 2 Gy fractions assuming an α/β-ratio of 2 Gy. A whole brain dose of 32.25 Gy and simultaneous boost doses to brain metastases of either 63.0 Gy (> 2.0 cm) or 70.8 Gy (< 2.0 cm) to be delivered in 15 fractions were prescribed. Plans were generated for a 2.5- and 1.0-cm field width (FW). To assess plan quality, the prescription isodose to target volume (PITV) ratio, target coverage, conformation number, and homogeneity index were computed. Results: Comparing treatment plans using a 1.0-cm FW to those using a 2.5-cm FW, the mean PITV ratio improved from 1.75 ± 0.61 to 1.48 ± 0.37, the whole brain homogeneity improved by 32% (p < 0.0004), and the mean dose in 2.0-Gy fraction equivalents received by the hippocampi varied from 5.8 ± 1.9 to 5.9 ± 1.3 Gy2. Conclusions: Delivery of radiosurgery-quality dose distributions to multiple brain metastases using helical tomotherapy is possible even when combined with whole brain radiation therapy and conformal avoidance of the hippocampi.

Idioma originalEnglish (US)
Título de la publicación alojadaRadiosurgery
Subtítulo de la publicación alojada8th International Stereotactic Radiosurgery Society Meeting, San Francisco, June 2007
Número de páginas11
EstadoPublished - mar 19 2010

Serie de la publicación

ISSN (versión impresa)1024-2651
ISSN (versión digital)1662-3940

ASJC Scopus subject areas

  • Surgery
  • Radiology Nuclear Medicine and imaging


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