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Radiological Investigation I: X-ray and CT

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 the...
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Updated: May 20, 2026

Whole-body PET/MRI of Pediatric Patients: The Details That Matter
10:02

Whole-body PET/MRI of Pediatric Patients: The Details That Matter

Published on: December 19, 2017

Justifying referrals for paediatric CT.

Zoe Brady1, Timothy M Cain, Peter N Johnston

  • 1Radiology, Alfred Health, Melbourne, VIC. z.brady@alfred.org.au

The Medical Journal of Australia
|July 17, 2012
PubMed
Summary
This summary is machine-generated.

Diagnostic imaging involving ionizing radiation carries a theoretical cancer risk, particularly for children and females. However, justified computed tomography (CT) scans offer more benefit than harm when medically necessary.

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Area of Science:

  • Medical Physics
  • Radiology
  • Radiation Biology

Background:

  • Radiation protection principles are based on a linear no-threshold dose-response model, extrapolated from high-dose epidemiological data.
  • Ionizing radiation, even at low doses, presents a theoretical risk of carcinogenesis, relevant to diagnostic imaging procedures.
  • Individual radiosensitivity varies, with children and females exhibiting higher susceptibility to radiation-induced risks compared to adults and males, respectively.

Purpose of the Study:

  • To elucidate the theoretical risks associated with low-dose ionizing radiation exposure from diagnostic imaging.
  • To contextualize radiation risk in relation to age and sex.
  • To emphasize the importance of risk-benefit analysis and justification for computed tomography (CT) scans.

Main Methods:

  • Review of epidemiological evidence at higher radiation doses to infer low-dose effects.
  • Application of the linear no-threshold model for radiation risk assessment.
  • Consideration of age- and sex-dependent radiosensitivity factors.

Main Results:

  • A small theoretical risk of carcinogenesis exists from low-dose ionizing radiation exposure during diagnostic imaging.
  • Children and females are identified as more radiosensitive populations.
  • Radiation risk is considered cumulative over an individual's lifetime.

Conclusions:

  • For any individual, a justified and optimized computed tomography (CT) scan provides a net benefit over potential harm.
  • Medical professionals must rigorously justify the necessity of CT scans before patient referral.
  • The current radiation protection system accounts for cumulative lifetime risk and varying radiosensitivity.