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Related Concept Videos

Therapeutic Drug Monitoring: Affecting Factors01:29

Therapeutic Drug Monitoring: Affecting Factors

289
Therapeutic Drug Monitoring (TDM) is the clinical practice of measuring specific drug levels in a patient's blood or body tissues to manage and optimize therapy. TDM is crucial for drugs with narrow therapeutic windows, like warfarin and phenytoin, where incorrect doses can lead to treatment failure or severe side effects. This monitoring ensures the dosage administered is within a safe and effective range. The factors affecting therapeutic drug monitoring include:Patient-Specific Factors:a.
289
Therapeutic Drug Monitoring: Overview and Classification01:16

Therapeutic Drug Monitoring: Overview and Classification

448
Therapeutic Drug Monitoring (TDM) is a clinical practice that measures specific drug levels in a patient's blood at designated intervals to ensure the drug concentration stays within a therapeutic range. This monitoring is crucial for optimizing individual dosage regimens, enhancing therapeutic efficacy, and minimizing drug-related toxicity. TDM is vital for drugs with narrow therapeutic windows, significant variability in pharmacokinetics, and a clear correlation between plasma levels and...
448
Dosage Regimen: Individualization01:24

Dosage Regimen: Individualization

232
Individualization in dosing regimens is the customization of medication doses for individual patients. Its necessity arises from the goal of maximizing therapeutic benefits while minimizing risks. This approach is pivotal because human responses to drugs can vary widely; what is effective for one person may be inadequate or excessive for another. Interpatient (intersubject) variability refers to differences in drug responses between individuals, while intrapatient (intrasubject) variability...
232
Therapeutic Drug Monitoring: Drug Analysis Methods01:26

Therapeutic Drug Monitoring: Drug Analysis Methods

250
Therapeutic Drug Monitoring (TDM) is a clinical practice that measures specific drug levels in a patient's blood or body tissues to tailor drug therapy effectively. This monitoring is critical for managing drugs with narrow therapeutic indices like digoxin and phenytoin, ensuring they are both safe and effective. For instance, monitoring theophylline levels in asthma patients involves precision and sensitivity to adjust doses according to individual responses to therapy, ensuring efficacy and...
250

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Updated: Mar 2, 2026

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TU-D-217A-01: CTDI and Patient Dose: A European Perspective.

W Kalender1

  • 1University of Erlangen.

Medical Physics
|May 19, 2017
PubMed
Summary

Computed tomography dose index (CTDI) is suitable for scanner quality control but not patient dose assessment. Patient dose should be estimated using scanner- and patient-specific methods for better accuracy and understanding.

Keywords:
AnatomyComputed tomographyControl systemsDosimetryEuropeImage scannersLecturesMedical physicsMonte Carlo methodsQuality assurance

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Area of Science:

  • Medical Physics
  • Radiological Protection
  • Imaging Technology

Background:

  • CTDI has been a dominant topic in Medical Physics due to increasing CT use and population dose.
  • Past concerns about high patient exposure have driven technical developments and initiatives.
  • Current discussions on CTDI and patient dose can be overly complicated.

Purpose of the Study:

  • To clarify the distinct roles of CTDI and patient dose assessment.
  • To propose pragmatic solutions for improving patient dose estimation and reporting.
  • To reduce unnecessary quality control burdens for medical physicists.

Main Methods:

  • Reviewing the established concept of CTDI for scanner dosimetry and quality control.
  • Discussing patient dose estimation using air kerma measurements and Monte Carlo calculations.
  • Exploring scanner- and patient-specific dose estimates with advanced software and manufacturer cooperation.
  • Revisiting the concept of Diagnostic Reference Levels (DRL).

Main Results:

  • CTDI is effective for scanner dosimetry and quality control on standard scanners.
  • New IEC dosimetry concepts are acceptable without novel phantoms.
  • Phantoms and concepts are still needed for automated exposure control QC.
  • CTDI should not be expanded for patient dose assessment.
  • Patient dose estimates (organ and effective dose) should be scanner- and patient-specific.
  • DRLs need to be revisited and potentially based on patient-specific conversions.

Conclusions:

  • CTDI and patient dose are distinct concepts requiring separate approaches.
  • Scanner- and patient-specific dose estimates offer more reliable information.
  • Streamlining QC and improving patient dose reporting are key objectives.
  • International consensus on CTDI and patient dose is desirable.