CBCT review confirm reproducible DIBH with AlignRT InBore
PO-1198
Abstract
CBCT review confirm reproducible DIBH with AlignRT InBore
Authors: Daniel NGUYEN1, Fabrice Lorchel1, Adel Mamou2, Nicolas Barbet1, Isabelle Pouchard1, François Renoult1, Jad Farah3, Mustapha Khodri1
1Centre de radiothérapie de Mâcon, Saône et loire, Mâcon, France; 2Neural, Hérault, Montpelier, France; 3Vision RT, London, London, United Kingdom
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Purpose or Objective
To investigate the reproducibility of
deep-inspiration breath hold (DIBH) breast cancer treatments on Halcyon™ performed
using the first clinical version of AlignRT InBore™.
Material and Methods
The ease and feasibility of DIBH treatments was retrospectively
investigated for the initial 22 left breast cancer patients treated on Halcyon™
using the first clinical version of AlignRT InBore™. Setup time, CBCT imaging
and analysis time as well as overall treatment time were recorded. Online and
offline review of CBCT images was undertaken to verify the compliance of
breast, heart, spine, sternum and lung domes positions.
Results
Mean ± standard deviation for patient setup,
CBCT analysis and overall treatment time were 4 ± 0.6 min, 1.1 ± 0.2 min and 14
± 1.8 min respectively. Online review of 520 CBCT acquisitions showed minimal
positioning shifts with AlignRT InBore™ guidance with mean ± standard deviation
of vertical, longitudinal, and lateral shifts of 1.7 ± 2.5 mm, -1.7 ± 3.8 mm,
and -0.2 ± 2.5 mm respectively. Meanwhile, offline review of 115 CBCTs, showed
reproducible BH with average ± standard magnitude deviation of breast, heart,
spine, sternum and lung domes within 2.3 ± 2.4 mm, 2.9 ± 2.0 mm, 3.3 ± 2.2 mm, 3.2
± 2.4 mm and 5.0 ± 6.7 mm respectively.
Conclusion
AlignRT InBore™ allows
for accurate and reproducible DIBH on Halcyon™ with breast and heart organs’
positions within 3 mm (in magnitude) of expected position and fully compliant
with local clinical and dosimetry margins.