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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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Radiological Investigation I: X-ray and CT01:30

Radiological Investigation I: X-ray and CT

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Radiological investigations, including X-rays and computed tomography (CT) scans, are critical for diagnosing and evaluating various medical conditions. These imaging techniques provide valuable insights into the body's internal structures, aiding in the detection of abnormalities, assessment of disease progression, and development of treatment strategies. This article delves into two primary radiological investigations, chest X-rays and CT scans, outlining their purpose, procedures, and...
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Updated: Jun 26, 2025

Positron Emission Tomography-based Dose Painting Radiation Therapy in a Glioblastoma Rat Model using the Small Animal Radiation Research Platform
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Advanced Computational Methods for Radiation Dose Optimization in CT.

Shreekripa Rao1, Krishna Sharan2, Srinidhi Gururajarao Chandraguthi2

  • 1Department of Radiotherapy and Oncology, Manipal College of Health Professions, Manipal 576104, India.

Diagnostics (Basel, Switzerland)
|May 11, 2024
PubMed
Summary
This summary is machine-generated.

This study optimized computed tomography (CT) protocols for radiotherapy, significantly reducing radiation doses. The new protocol achieved lower diagnostic reference levels (DRLs) and effective doses, ensuring patient safety while maintaining image quality.

Keywords:
computed tomographydiagnostic reference leveldose-length producteffective doseradiotherapy

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Area of Science:

  • Radiotherapy Physics
  • Medical Imaging
  • Radiation Oncology

Background:

  • Computed tomography (CT) is essential for radiotherapy planning but involves ionizing radiation exposure.
  • Minimizing radiation doses, adhering to the 'As Low As Reasonably Achievable' principle, is critical for patient safety.
  • Limited literature exists on optimizing CT scans specifically for radiotherapy planning.

Purpose of the Study:

  • To review and optimize radiation doses in head, neck, and pelvic CT scans for radiotherapy planning.
  • To evaluate strategies for reducing effective dose and diagnostic reference levels (DRLs) while preserving image quality.

Main Methods:

  • A cross-sectional study involving 300 cancer patients (head, neck, pelvic regions) was conducted.
  • Calculated diagnostic reference levels (DRLs), effective dose, CTDIvol, and dose-length product (DLP) for standard and optimized protocols.
  • Proposed DRLs for DLP using the 75th percentile, comparing optimized protocols with institutional and external data.

Main Results:

  • Significant reductions in CTDIvol (up to 70%), DLP (up to 61%), and effective dose (up to 67%) were observed with the optimized protocol.
  • The optimized protocol resulted in institutionally low DRLs compared to other centers.
  • Variations in radiation dose metrics were noted between standard and optimized protocols.

Conclusions:

  • An optimized CT protocol effectively reduces radiation dose in radiotherapy planning.
  • Proposed DRLs for the optimized protocol serve as benchmarks for future comparisons.
  • The study demonstrates successful dose reduction strategies for head, neck, and pelvic CT scans.