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Related Concept Videos

Drug Accumulation During Multiple Dosing: Repetitive IV Injections01:21

Drug Accumulation During Multiple Dosing: Repetitive IV Injections

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Calculating drug dosage and accumulation in multiple-dose regimens is crucial for achieving therapeutic efficacy while avoiding toxicity. This involves determining the plasma drug concentrations over time to optimize dosing schedules. The principle of superposition is fundamental in this process, allowing for the prediction of drug concentration in plasma following multiple doses based on single-dose data.The principle of superposition asserts that the plasma concentration-time curves from...
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Drug Accumulation During Multiple Dosing: Intermittent IV Infusions01:24

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Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
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Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Temperature Dependent Deformation01:12

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Deformations in a Symmetric Member in Bending01:18

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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
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Deformable Registration for Dose Accumulation.

Indrin J Chetty1, Mihaela Rosu-Bubulac2

  • 1Department of Radiation Oncology, Henry Ford Cancer Institute, Henry Ford Health System, Detroit, MI.

Seminars in Radiation Oncology
|April 28, 2019
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Summary
This summary is machine-generated.

Deformable image registration and dose accumulation are crucial for adaptive radiotherapy, enabling personalized treatments by analyzing cumulative doses. Patient-specific quality assurance is vital to manage uncertainties in 3D dose distributions for improved outcomes.

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Area of Science:

  • Medical Physics
  • Radiotherapy Oncology
  • Medical Imaging

Background:

  • Deformable image registration (DIR) is increasingly used in clinical practice for image-guided adaptive radiotherapy.
  • Dose accumulation techniques are vital for evaluating cumulative doses to targets and healthy tissues in fractionated treatment regimens.

Purpose of the Study:

  • To review current DIR and dose accumulation techniques in adaptive radiotherapy.
  • To discuss challenges and unanswered questions in applying these methods for personalized treatment and response assessment.

Main Methods:

  • Review of current literature on deformable image registration and dose accumulation algorithms.
  • Discussion of clinical applications and quality assurance requirements for adaptive radiotherapy.

Main Results:

  • DIR and dose accumulation offer potential for understanding dose-volume-effect relationships and personalizing treatment.
  • Patient-specific quality assurance is essential to identify and manage uncertainties in 3D dose distributions.

Conclusions:

  • While DIR and dose accumulation show promise for adaptive radiotherapy, further research is needed to address existing uncertainties.
  • Effective application of these techniques requires careful consideration of their clinical relevance and limitations for treatment adaptation and response assessment.