An efficient Volumetric Arc Therapy treatment planning approach for hippocampal-avoidance whole-brain radiation therapy (HA-WBRT)

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Abstract

An efficient and simple class solution is proposed for hippocampal-avoidance whole-brain radiation therapy (HA-WBRT) planning using the Volumetric Arc Therapy (VMAT) delivery technique following the NRG Oncology protocol NRG-CC001 treatment planning guidelines. The whole-brain planning target volume (PTV) was subdivided into subplanning volumes that lie in plane and out of plane with the hippocampal-avoidance volume. To further improve VMAT treatment plans, a partial-field dual-arc technique was developed. Both the arcs were allowed to overlap on the in-plane subtarget volume, and in addition, one arc covered the superior out-of-plane sub-PTV, while the other covered the inferior out-of-plane subtarget volume. For all plans (n = 20), the NRG-CC001 protocol dose-volume criteria were met. Mean values of volumes for the hippocampus and the hippocampal-avoidance volume were 4.1cm<sup>3</sup> ± 1.0cm<sup>3</sup> and 28.52cm<sup>3</sup> ± 3.22cm<sup>3</sup>, respectively. For the PTV, the average values of D<inf>2%</inf> and D<inf>98%</inf> were 36.1Gy ± 0.8Gy and 26.2Gy ± 0.6Gy, respectively. The hippocampus D<inf>100%</inf> mean value was 8.5Gy ± 0.2Gy and the maximum dose was 15.7Gy ± 0.3Gy. The corresponding plan quality indices were 0.30 ± 0.01 (homogeneity index), 0.94 ± 0.01 (target conformality), and 0.75 ± 0.02 (confirmation number). The median total monitor unit (MU) per fraction was 806MU (interquartile range [IQR]: 792 to 818MU) and the average beam total delivery time was 121.2 seconds (IQR: 120.6 to 121.35 seconds). All plans passed the gamma evaluation using the 5-mm, 4% criteria, with γ > 1 of not more than 9.1% data points for all fields. An efficient and simple planning class solution for HA-WBRT using VMAT has been developed that allows all protocol constraints of NRG-CC001 to be met.

Original languageEnglish (US)
Pages (from-to)205-209
Number of pages5
JournalMedical Dosimetry
Volume40
Issue number3
DOIs
StatePublished - Feb 3 2015

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Radiotherapy
Brain
Hippocampus
Therapeutics
Guidelines

Keywords

  • Hippocampal avoidance
  • RapidArc
  • Treatment planning class solution
  • Whole-brain radiation therapy

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

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title = "An efficient Volumetric Arc Therapy treatment planning approach for hippocampal-avoidance whole-brain radiation therapy (HA-WBRT)",
abstract = "An efficient and simple class solution is proposed for hippocampal-avoidance whole-brain radiation therapy (HA-WBRT) planning using the Volumetric Arc Therapy (VMAT) delivery technique following the NRG Oncology protocol NRG-CC001 treatment planning guidelines. The whole-brain planning target volume (PTV) was subdivided into subplanning volumes that lie in plane and out of plane with the hippocampal-avoidance volume. To further improve VMAT treatment plans, a partial-field dual-arc technique was developed. Both the arcs were allowed to overlap on the in-plane subtarget volume, and in addition, one arc covered the superior out-of-plane sub-PTV, while the other covered the inferior out-of-plane subtarget volume. For all plans (n = 20), the NRG-CC001 protocol dose-volume criteria were met. Mean values of volumes for the hippocampus and the hippocampal-avoidance volume were 4.1cm3 ± 1.0cm3 and 28.52cm3 ± 3.22cm3, respectively. For the PTV, the average values of D2{\%} and D98{\%} were 36.1Gy ± 0.8Gy and 26.2Gy ± 0.6Gy, respectively. The hippocampus D100{\%} mean value was 8.5Gy ± 0.2Gy and the maximum dose was 15.7Gy ± 0.3Gy. The corresponding plan quality indices were 0.30 ± 0.01 (homogeneity index), 0.94 ± 0.01 (target conformality), and 0.75 ± 0.02 (confirmation number). The median total monitor unit (MU) per fraction was 806MU (interquartile range [IQR]: 792 to 818MU) and the average beam total delivery time was 121.2 seconds (IQR: 120.6 to 121.35 seconds). All plans passed the gamma evaluation using the 5-mm, 4{\%} criteria, with γ > 1 of not more than 9.1{\%} data points for all fields. An efficient and simple planning class solution for HA-WBRT using VMAT has been developed that allows all protocol constraints of NRG-CC001 to be met.",
keywords = "Hippocampal avoidance, RapidArc, Treatment planning class solution, Whole-brain radiation therapy",
author = "Jin Shen and Edward Bender and Ravindra Yaparpalvi and Hsiang-Chi Kuo and Amar Basavatia and Linda Hong and Bodner, {William R.} and Garg, {Madhur K.} and Shalom Kalnicki and Tome, {Wolfgang A.}",
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T1 - An efficient Volumetric Arc Therapy treatment planning approach for hippocampal-avoidance whole-brain radiation therapy (HA-WBRT)

AU - Shen, Jin

AU - Bender, Edward

AU - Yaparpalvi, Ravindra

AU - Kuo, Hsiang-Chi

AU - Basavatia, Amar

AU - Hong, Linda

AU - Bodner, William R.

AU - Garg, Madhur K.

AU - Kalnicki, Shalom

AU - Tome, Wolfgang A.

PY - 2015/2/3

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N2 - An efficient and simple class solution is proposed for hippocampal-avoidance whole-brain radiation therapy (HA-WBRT) planning using the Volumetric Arc Therapy (VMAT) delivery technique following the NRG Oncology protocol NRG-CC001 treatment planning guidelines. The whole-brain planning target volume (PTV) was subdivided into subplanning volumes that lie in plane and out of plane with the hippocampal-avoidance volume. To further improve VMAT treatment plans, a partial-field dual-arc technique was developed. Both the arcs were allowed to overlap on the in-plane subtarget volume, and in addition, one arc covered the superior out-of-plane sub-PTV, while the other covered the inferior out-of-plane subtarget volume. For all plans (n = 20), the NRG-CC001 protocol dose-volume criteria were met. Mean values of volumes for the hippocampus and the hippocampal-avoidance volume were 4.1cm3 ± 1.0cm3 and 28.52cm3 ± 3.22cm3, respectively. For the PTV, the average values of D2% and D98% were 36.1Gy ± 0.8Gy and 26.2Gy ± 0.6Gy, respectively. The hippocampus D100% mean value was 8.5Gy ± 0.2Gy and the maximum dose was 15.7Gy ± 0.3Gy. The corresponding plan quality indices were 0.30 ± 0.01 (homogeneity index), 0.94 ± 0.01 (target conformality), and 0.75 ± 0.02 (confirmation number). The median total monitor unit (MU) per fraction was 806MU (interquartile range [IQR]: 792 to 818MU) and the average beam total delivery time was 121.2 seconds (IQR: 120.6 to 121.35 seconds). All plans passed the gamma evaluation using the 5-mm, 4% criteria, with γ > 1 of not more than 9.1% data points for all fields. An efficient and simple planning class solution for HA-WBRT using VMAT has been developed that allows all protocol constraints of NRG-CC001 to be met.

AB - An efficient and simple class solution is proposed for hippocampal-avoidance whole-brain radiation therapy (HA-WBRT) planning using the Volumetric Arc Therapy (VMAT) delivery technique following the NRG Oncology protocol NRG-CC001 treatment planning guidelines. The whole-brain planning target volume (PTV) was subdivided into subplanning volumes that lie in plane and out of plane with the hippocampal-avoidance volume. To further improve VMAT treatment plans, a partial-field dual-arc technique was developed. Both the arcs were allowed to overlap on the in-plane subtarget volume, and in addition, one arc covered the superior out-of-plane sub-PTV, while the other covered the inferior out-of-plane subtarget volume. For all plans (n = 20), the NRG-CC001 protocol dose-volume criteria were met. Mean values of volumes for the hippocampus and the hippocampal-avoidance volume were 4.1cm3 ± 1.0cm3 and 28.52cm3 ± 3.22cm3, respectively. For the PTV, the average values of D2% and D98% were 36.1Gy ± 0.8Gy and 26.2Gy ± 0.6Gy, respectively. The hippocampus D100% mean value was 8.5Gy ± 0.2Gy and the maximum dose was 15.7Gy ± 0.3Gy. The corresponding plan quality indices were 0.30 ± 0.01 (homogeneity index), 0.94 ± 0.01 (target conformality), and 0.75 ± 0.02 (confirmation number). The median total monitor unit (MU) per fraction was 806MU (interquartile range [IQR]: 792 to 818MU) and the average beam total delivery time was 121.2 seconds (IQR: 120.6 to 121.35 seconds). All plans passed the gamma evaluation using the 5-mm, 4% criteria, with γ > 1 of not more than 9.1% data points for all fields. An efficient and simple planning class solution for HA-WBRT using VMAT has been developed that allows all protocol constraints of NRG-CC001 to be met.

KW - Hippocampal avoidance

KW - RapidArc

KW - Treatment planning class solution

KW - Whole-brain radiation therapy

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