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Hania Al-Hallaq, Ph.D.The University of Chicago
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Wednesday, Therapy: Surface Image Guided Radiotherapy Monitoring Systems:◦ 10:15am - Noon (No check in after 10:30am), Room 201B◦ First come first served!
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I receive royalties and licensing fees for computer-aided diagnosis technology through The University of Chicago.
I am co-Chair of “TG-302: Surface Image Guided RT” but this presentation does not represent any AAPM guidelines.
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Introduce surface imaging (SI) & its clinical applications
Motivate QA & safety applications of SI
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Non-invasive, optical 3D imaging modality Registers real-time patient surface to a reference
surface (CT-simulation vs camera-acquired) Registration can be limited to region-of-interest (ROI) Compares registered translations/rotations to a user-
defined threshold to alert the therapy team and/or hold the beam
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3D Surface from CT data
‘Entire’ ROI ‘Breast’ ROI
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Initial patient positioning:◦ 3D modality◦ No radiation dose◦ Real-time feedback over a large field-of-view
Intra-fraction monitoring:◦ Voluntary deep-inspiration breath-hold (DIBH)
for whole-breast radiotherapy (WBRT)◦ Frameless SRS
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Treatment Quality:◦ Efficiency?
Safety Checks:◦ Correct immobilization?◦ Correct isocenter treated?
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Reduce filming frequency Increase throughput
n=50 Before AlignRT AfterAlignRT% of Patients with shifts < 1cm 64% 92%% of Patients with shifts < 1cm; total time < 30mins 44% 72%
The University of Chicago Medicine WBRT
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Pitch problem caused by changed in breath-hold pattern or positioning?
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AP kV LAT kV DRR/Med MV port
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Pitch resolved!
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1) Introduce surface imaging as a quality improvement tool
2) Review current quality improvement applications of surface imaging
3) Discuss potential future quality improvement applications of surface imaging
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Alonso Gutierrez, PhD, Miami Cancer Institute Hui Zhao, PhD, Univ. of Utah David Wiant, PhD, Cone Health Cancer Center Laura Padilla, PhD, Virginia Commonwealth Univ. Mike Tallhamer, MS, Centura Health
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Colleagues:◦ Steven Chmura, M.D., Ph.D.◦ Yasmin Hasan, M.D.◦ Maxine Washington, M.D.◦ Therapy & dosimetry team
TG-302 members