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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...
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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...
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Gentamicin, an aminoglycoside antibiotic, is commonly administered via intermittent intravenous infusion to treat severe infections. An intermittent one-hour infusion of gentamicin, administered at eight-hour intervals, allows for precise control of plasma drug concentrations, minimizing toxicity while ensuring therapeutic efficacy. Pharmacokinetic principles govern the dynamics of plasma concentrations and can be mathematically described using specific equations.The plasma drug concentration...
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Comprehensive evaluation and clinical implementation of commercially available Monte Carlo dose calculation

Aizhen Zhang1, Ning Wen, Teamour Nurushev

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Computational Dosimetry

Background:

  • Eclipse treatment planning system now offers a commercial electron Monte Carlo (eMC) dose calculation algorithm.
  • Accurate dose calculation is critical for effective radiation therapy planning and patient outcomes.

Purpose of the Study:

  • To evaluate the accuracy and clinical implementation of the eMC algorithm within the Eclipse treatment planning system.
  • To compare the performance of the eMC algorithm against the pencil beam (PB) algorithm in various phantom conditions and patient cases.

Main Methods:

  • Beam modeling of the eMC algorithm for energies 6-20 MeV on a Varian Trilogy system.
  • Accuracy assessment in homogeneous, heterogeneous (lung, bone), and anthropomorphic phantoms.
  • Clinical implementation evaluated via treatment planning for 15 patients with diverse lesion locations.
  • Comparison of dose distributions and monitor units (MUs) calculated by eMC and PB algorithms, with and without 3D Gaussian smoothing.

Main Results:

  • eMC algorithm achieved overall agreement within 3%/2 mm compared to measurements.
  • PB algorithm showed significant errors (up to 25%) in heterogeneous phantoms, underestimating dose in low-density regions.
  • 3D Gaussian smoothing improved dose distribution visualization and target coverage, increasing eMC calculated MUs.
  • eMC demonstrated deeper penetration in low-density tissues, correcting PB underestimations.
  • eMC computation time was comparable to PB algorithm, ranging from 5 to 66 minutes.

Conclusions:

  • The eMC algorithm provides a significant improvement in dose calculation accuracy over the PB algorithm, particularly in the presence of tissue inhomogeneities.
  • Clinical implementation is feasible, with smoothing techniques enhancing usability and target coverage.
  • eMC is recommended for electron beam therapy planning, especially when dealing with complex patient geometries and heterogeneous tissues.