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Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a specific amount of medication is given at regular intervals, often multiple times a day, to ensure a consistent drug concentration in the bloodstream.
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Dosage Regimen: Multiple Oral Dosage01:25

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Understanding how a drug's concentration fluctuates within the body over time is crucial in pharmacokinetics, particularly with multiple oral doses. A graphical representation of multiple oral dosages provides insight into these dynamics. Typical accumulation curves of a drug's concentration in the body reveal a sawtooth pattern, indicating periodic peaks and troughs correlating with each dose administration and the drug's subsequent elimination.The plasma concentration at any time during an...
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Rectal contrast increases rectal dose during vaginal cuff brachytherapy.

Sebastia Sabater1, Ignacio Andres1, Esther Jimenez-Jimenez2

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Using rectal contrast during vaginal cuff brachytherapy (VCB) increases rectal volume and radiation dose. Avoiding rectal contrast can improve the therapeutic ratio for VCB patients.

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Area of Science:

  • Gynecologic Oncology
  • Radiation Oncology
  • Medical Imaging

Background:

  • Vaginal cuff brachytherapy (VCB) is a radiotherapy technique used in gynecologic oncology.
  • Optimizing radiation dose delivery is crucial for maximizing treatment efficacy and minimizing toxicity.

Purpose of the Study:

  • To investigate the effect of rectal contrast instillation on rectal dose parameters during VCB.
  • To determine if rectal contrast influences rectal volume and radiation exposure.

Main Methods:

  • Retrospective analysis of 36 pairs of CT scans from patients undergoing VCB.
  • Comparison of rectal dose-volume histogram parameters (Dmax, D(0.1cc), D(1cc), D(2cc)) with and without rectal contrast.
  • Standardized rectal segmentation and treatment planning parameters were applied.

Main Results:

  • Rectal volume was significantly larger by 26.7% when rectal contrast was used.
  • Radiation dose parameters (D(0.1cc), D(1cc), D(2cc)) increased by 7.7%–10.4% with rectal contrast.
  • Dmax did not show a significant difference based on rectal contrast use.

Conclusions:

  • Eliminating rectal contrast during VCB can reduce rectal radiation dose, potentially improving the therapeutic ratio.
  • Strategies to maintain a less full rectum may offer similar benefits in reducing rectal dose.