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Updated: Mar 2, 2026

Optimization of the Longa Middle Cerebral Artery Occlusion Method for Complete Reperfusion
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SU-E-T-562: Reducing the Arc Span for CSA VMAT Delivery.

P Myers1,2, S Stathakis1,2, A Gutierrez1,2

  • 1Cancer Therapy and Research Center at UT Health Science Center, San Antonio, TX.

Medical Physics
|May 19, 2017
PubMed
Summary
This summary is machine-generated.

Using multiple, shorter, sub-arc deliveries for cranio-spinal axis (CSA) irradiation significantly reduces normal tissue doses compared to full arc treatments. This approach ensures adequate target coverage while potentially improving patient outcomes in radiation therapy.

Keywords:
EyesKidneys

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Area of Science:

  • Radiation Oncology
  • Medical Physics

Background:

  • Cranio-spinal axis (CSA) irradiation is a complex radiotherapy technique.
  • Optimizing dose delivery while minimizing toxicity is crucial for CSA treatments.

Purpose of the Study:

  • To compare the dosimetric advantages and disadvantages of using multiple, shorter, sub-arc deliveries versus traditional full arc deliveries for CSA irradiation.

Main Methods:

  • Five CSA patients were replanned using both full arc and split sub-arc techniques.
  • Dose distributions were evaluated for planning target volume (PTV) coverage and normal structure sparing.
  • Conformity number, homogeneity index, maximum doses, and mean doses were assessed.

Main Results:

  • Sub-arc plans showed slightly lower PTV conformity but improved homogeneity compared to full arc plans.
  • Nearly all evaluated normal structures received lower maximum and mean doses with sub-arc deliveries.
  • Beam on times were comparable, with sub-arc plans having lower monitor units.

Conclusions:

  • Sub-arc treatment deliveries offer dosimetric benefits for CSA irradiation by reducing normal tissue toxicity.
  • This technique provides adequate PTV coverage and presents a favorable alternative to full arc deliveries.