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Related Concept Videos

Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Imaging Studies III: Computed Tomography01:27

Imaging Studies III: Computed Tomography

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Dose Size and Dosing Frequency: Determination Methods01:21

Dose Size and Dosing Frequency: Determination Methods

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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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Determination of Multiple Dosing Parameters: Loading and Maintenance Doses01:25

Determination of Multiple Dosing Parameters: Loading and Maintenance Doses

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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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Lung Capacity01:47

Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Rational Dosage Regimen: Maintenance Dose and Loading Dose01:24

Rational Dosage Regimen: Maintenance Dose and Loading Dose

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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...
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Related Experiment Video

Updated: Jan 25, 2026

Using Micro-computed Tomography for the Assessment of Tumor Development and Follow-up of Response to Treatment in a Mouse Model of Lung Cancer
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Lung Cancer Screening: Use of Low-Dose Computed Tomography.

Encarnación Martínez Pérez1, Karol de Aguiar Quevedo2, Miguel Arrarás Martínez2

  • 1Unidad de Neumología, Servicio de Cirugía Torácica, Fundación Instituto Valenciano de Oncología, Valencia, España.

Archivos De Bronconeumologia
|May 1, 2019
PubMed
Summary

Low-dose CT screening detects lung cancer (LC) early in asymptomatic, high-risk individuals. This approach improves early diagnosis and survival rates for lung cancer.

Keywords:
Cribado de cáncer de pulmónCáncer de pulmónDiagnóstico precoz de cáncer de pulmónEarly diagnosis of lung cancerLow-dose computed tomographyLung cancerLung cancer screeningTomografía computarizada de baja dosis

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Area of Science:

  • Oncology
  • Radiology
  • Public Health

Background:

  • Lung cancer (LC) prognosis is strongly linked to diagnosis stage.
  • Early detection significantly improves patient outcomes.

Purpose of the Study:

  • To evaluate the effectiveness of low-dose CT (LDCT) screening for early lung cancer detection in high-risk asymptomatic individuals.
  • To assess the diagnostic performance and survival rates associated with LDCT screening.

Main Methods:

  • A cohort of 4,951 asymptomatic individuals (≥50 years old, smokers/former smokers) underwent LDCT screening.
  • Nodules were evaluated using a defined algorithm, with follow-up for 5 years.
  • Diagnostic accuracy metrics (sensitivity, specificity, PPV, NPV) were calculated.

Main Results:

  • 52 tumors (49 LC) were detected, with 25 (52.08%) in stage I.
  • The 5-year overall survival rate for LC was 58.5%, and cancer-specific survival was 67.1%.
  • LDCT demonstrated high sensitivity (92.31% baseline) and specificity (89.54% baseline) for detecting lung cancer.

Conclusions:

  • LDCT screening, when integrated with a comprehensive nodule evaluation program, is effective for early lung cancer diagnosis.
  • Early detection through LDCT screening contributes to improved survival rates in lung cancer patients.