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Radiological Investigation I: X-ray and CT01:30

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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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Repeated Contrast-Enhanced Micro-CT Examinations Decrease Animal Welfare and Influence Tumor Physiology.

Jasmin Baier1, Anne Rix1, Milita Darguzyte1

  • 1From the Institute for Experimental Molecular Imaging, Medical Faculty, RWTH Aachen International University, Aachen, Germany.

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This summary is machine-generated.

Repeated computed tomography (CT) scans, especially contrast-enhanced (CE-CT), negatively impact animal welfare and motor coordination in mice. These imaging procedures also alter tumor physiology, affecting perfusion and proliferation, which requires careful consideration in preclinical research.

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Area of Science:

  • Preclinical research
  • Animal models
  • Medical imaging

Background:

  • Computed tomography (CT) is widely used in preclinical research.
  • Potential welfare and physiological impacts of CT, anesthesia, and handling exist.
  • Longitudinal studies with repeated CT require careful welfare assessment.

Purpose of the Study:

  • To investigate the influence of repeated native and contrast-enhanced CT on animal welfare.
  • To assess the impact of repeated CT on tumor physiology in mice.
  • To evaluate effects in both regorafenib-treated and non-treated tumor-bearing mice.

Main Methods:

  • Mice with 4T1 breast cancer underwent 3 imaging sessions within 1 week.
  • Groups included no imaging, anesthesia only, native CT (4/50 mGy), and contrast-enhanced CT (CE-CT).
  • Animal welfare assessed via behavior, motor tests, heart rate, and corticosterone; tumor physiology analyzed histologically.

Main Results:

  • Anesthesia and CT imaging increased animal burden; CE-CT significantly impaired motor coordination.
  • Native CT did not affect motor coordination, but CE-CT combined with therapy did.
  • Tumor growth and blood vessel density were unaffected, but CT increased tumor perfusion and decreased proliferation.

Conclusions:

  • Repeated CT imaging, particularly CE-CT, can impair animal welfare and motor coordination.
  • Standard CT protocols may induce alterations in tumor physiology with repetitive use.
  • Potential effects of native and CE-CT on preclinical oncological research outcomes must be considered.