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Related Concept Videos

Improving Translational Accuracy02:07

Improving Translational Accuracy

Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
Improving Translational Accuracy02:07

Improving Translational Accuracy

Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Multimodal Cross-Device and Marker-Free Co-Registration of Preclinical Imaging Modalities
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Published on: October 27, 2023

TRACKING ORGAN OVERLAP FOR A CONSTRAINED NON-RIGID REGISTRATION ALGORITHM.

W H Greene1, S Chelikani, X Papademetris

  • 1Department of Biomedical Engineering, Yale University, New Haven, CT, USA.

Proceedings. IEEE International Symposium on Biomedical Imaging
|September 28, 2011
PubMed
Summary
This summary is machine-generated.

This study improved prostate radiotherapy by tracking organ overlap using constrained non-rigid registration (NRR) for computed tomographic (CT) images. The constrained NRR algorithm yielded superior registration results compared to unconstrained methods.

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Published on: November 23, 2019

Area of Science:

  • Medical physics
  • Radiotherapy imaging
  • Computational anatomy

Background:

  • Accurate image registration is crucial for effective external beam prostate radiotherapy.
  • Non-rigid registration (NRR) algorithms are used to account for organ motion during radiotherapy.
  • Tracking organ overlap, including the prostate, rectum, and bladder, is essential for precise treatment planning.

Purpose of the Study:

  • To evaluate the effectiveness of a constrained non-rigid registration (NRR) algorithm in improving the accuracy of computed tomographic (CT) image registration for prostate radiotherapy.
  • To assess the impact of tracking organ overlap on NRR performance.

Main Methods:

  • Development and application of a constrained NRR algorithm incorporating organ overlap tracking.
  • Utilizing a hierarchical multi-resolution Free-Form Deformation (FFD) based on cubic B-splines to model organ motion.
  • Minimizing a cost function combining organ overlap, image similarity, and transformation smoothness.

Main Results:

  • The constrained NRR algorithm demonstrated improved registration accuracy compared to an unconstrained approach.
  • Tracking organ overlap within the NRR algorithm contributed to enhanced registration outcomes.
  • The method effectively described local organ motion using the FFD model.

Conclusions:

  • Constrained NRR with organ overlap tracking offers superior performance for CT image registration in prostate radiotherapy.
  • This approach enhances the precision of radiotherapy by better accounting for anatomical changes.
  • The findings support the clinical utility of advanced NRR techniques in radiation oncology.