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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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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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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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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...
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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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Dose calculation algorithm accuracy for small fields in non-homogeneous media: The lung SBRT case.

Antonella Fogliata1, Luca Cozzi2

  • 1Humanitas Research Hospital and Cancer Center, Radiotherapy and Radiosurgery Dept, via Manzoni 56, 20089 Milan-Rozzano, Italy.

Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)
|November 29, 2016
PubMed
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This review examines dose calculation accuracy for stereotactic lung lesion treatment. Type "a" algorithms are unsuitable, while types "b" and "c" offer acceptable accuracy for this critical radiotherapy application.

Keywords:
InhomogeneityLow densityLung SBRTSmall fields

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Computational Dosimetry

Background:

  • Stereotactic treatments for lung lesions require high dose calculation accuracy.
  • Algorithm complexity influences accuracy in charged particle transport simulation.
  • Small fields and low-density media present significant challenges in lung radiotherapy.

Purpose of the Study:

  • To review and summarize literature findings on dose calculation accuracy for stereotactic lung treatments.
  • To evaluate the performance of different algorithm types (a, b, c) in complex scenarios.
  • To identify critical factors affecting dose calculation accuracy in lung lesion treatment.

Main Methods:

  • Literature review of studies categorizing algorithms by complexity (type a, b, c).
  • Analysis of findings related to small field dosimetry and heterogeneous low-density media.
  • Comparison of accuracy levels reported for different algorithm types.

Main Results:

  • Type "a" algorithms exhibit significant inaccuracies (20-30%) and are unsuitable for lung stereotactic treatments.
  • Type "b" algorithms achieve approximately 10% accuracy.
  • Type "c" algorithms demonstrate the highest accuracy (around 5%), particularly in heterogeneous media.

Conclusions:

  • Algorithm type is crucial for accurate dose calculation in stereotactic lung treatments.
  • Type "c" algorithms are recommended for their superior accuracy in complex lung environments.
  • Addressing challenges in small field dosimetry and low-density media is essential for improving treatment efficacy.