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Related Concept Videos

Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

Determining the optimal dose size and dosing frequency in pharmacotherapy is crucial for achieving therapeutic effectiveness while minimizing adverse effects. This article explores the methodologies employed in determining these parameters, focusing on their significance and interplay to tailor dosing regimens.Dose Size: Dose size refers to the amount of a drug administered in a single dose. It is determined based on the drug's pharmacodynamics and pharmacokinetics properties and...
Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

A loading dose is an essential pharmacological strategy to rapidly achieve the target plasma drug concentration necessary for an immediate therapeutic effect. This approach is especially critical for drugs characterized by slow absorption or extended half-lives, where delaying therapeutic plasma levels could compromise treatment outcomes. By administering a loading dose, clinicians ensure a prompt onset of drug action, even for agents with complex pharmacokinetic profiles.Achieving steady-state...
Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
Biological Effects of Radiation02:59

Biological Effects of Radiation

All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
Rational Dosage Regimen: Maintenance Dose and Loading Dose01:24

Rational Dosage Regimen: Maintenance Dose and Loading Dose

A rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
In most cases, drugs are administered repetitively or infused continuously to maintain a steady-state concentration in the body. At a steady state,...
Dosage Regimens: Partial Pharmacokinetic Parameters01:01

Dosage Regimens: Partial Pharmacokinetic Parameters

It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...

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Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
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[CUDA-based fast dose calculation in radiotherapy].

Xianliang Wang1, Cao Liu, Qing Hou

  • 1Key Laboratory of Radiation Physics and Technology, Ministry of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China.

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi = Journal of Biomedical Engineering = Shengwu Yixue Gongchengxue Zazhi
|November 22, 2011
PubMed
Summary
This summary is machine-generated.

This study optimized the finite size pencil beam (FSPB) algorithm for radiotherapy dose calculation by porting it to graphics processing units (GPUs). The GPU-implemented FSPB significantly accelerates calculations, enabling real-time treatment planning.

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Area of Science:

  • Medical Physics
  • Computational Science

Context:

  • Radiotherapy dose calculation is crucial for treatment planning.
  • Current algorithms require high accuracy and computational efficiency.
  • The finite size pencil beam (FSPB) algorithm is widely used but needs performance improvements for real-time applications.

Purpose:

  • To enhance the computational efficiency of the FSPB algorithm for radiotherapy dose calculation.
  • To implement and evaluate a graphics processing unit (GPU)-accelerated version of the FSPB algorithm.

Summary:

  • The most time-consuming components of the FSPB algorithm were parallelized and executed on a GPU.
  • The GPU-implemented FSPB demonstrated significant speedups compared to a central processing unit (CPU)-based implementation.
  • Speed improvements ranged from 25-35 times on a consumer GPU and 55-100 times on a high-performance GPU.

Impact:

  • The GPU-accelerated FSPB algorithm achieves dose calculation speeds suitable for real-time radiotherapy treatment planning.
  • This advancement can lead to more efficient and potentially more accurate radiation therapy delivery.
  • The findings suggest a practical approach for improving computational performance in medical physics applications.