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Related Experiment Video

Updated: Feb 3, 2026

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Collision-avoiding imaging trajectories for linac mounted cone-beam CT.

Andrew M Davis1,2, Erik A Pearson1, Xiaochuan Pan3

  • 1Department of Radiation and Cellular Oncology, University of Chicago, Chicago.

Journal of X-Ray Science and Technology
|November 8, 2018
PubMed
Summary

New cone-beam CT imaging trajectories enable radiation therapy for patients previously excluded due to machine collisions. These advanced methods ensure comparable image quality, expanding access to crucial imaging for cancer treatment.

Keywords:
CBCTIGRTcollision avoidancenoncircular trajectoriesvariable magnificationvirtual isocenter

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Area of Science:

  • Medical Imaging
  • Radiation Oncology
  • Image-Guided Therapy

Background:

  • Patient size, position, or fixation devices can prevent cone-beam CT (CBCT) imaging for image-guided radiation therapy due to machine collisions.
  • This limitation excludes certain patients from receiving necessary imaging for treatment planning and delivery.

Purpose of the Study:

  • To develop and evaluate novel imaging trajectories that circumvent machine-patient collisions during CBCT acquisition.
  • To maintain diagnostic image quality comparable to standard techniques.

Main Methods:

  • Investigated virtual isocenter trajectories to continuously adjust patient position during gantry rotation, increasing clearance.
  • Employed dynamic magnification to adjust the kV detector position, avoiding collision points while acquiring sufficient data.
  • Assessed image quality using metrics like RMSE and SSIM against standard circular acquisition.

Main Results:

  • Collision-avoiding trajectories demonstrated comparable contrast and resolution to standard imaging techniques.
  • Quantitative analysis showed minimal differences in image fidelity (RMSE <7×10-4, SSIM >0.97) compared to standard scans.
  • Both independent and combined strategies successfully avoided collisions.

Conclusions:

  • Proposed imaging trajectories effectively prevent machine-patient collisions during CBCT acquisition.
  • The developed methods provide image quality on par with current standards.
  • This enables CBCT imaging for patients previously unable to undergo the procedure, expanding treatment accessibility.