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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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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
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Computed Tomography01:10

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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.
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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
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Customised weight-based volume contrast media protocol for multiphase abdominal computed tomography.

Lilian Poh Poh Yap1,2, Fadhli Mohamed Sani1,2, Eric Chung1,2

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A new weight-based multiphase CT protocol reduces radiation exposure and costs. This optimized approach maintains excellent image quality and contrast enhancement, benefiting low-weight patients.

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Area of Science:

  • Radiology
  • Medical Imaging
  • Radiation Oncology

Background:

  • Multiphase CT scans with fixed contrast media volumes pose risks of high radiation exposure and toxicity, particularly in low-body-weight patients.
  • Evaluating customized, weight-based protocols is crucial for optimizing patient safety and scan efficacy.

Purpose of the Study:

  • To assess a customized weight-based multiphase CT protocol.
  • To evaluate its impact on radiation exposure, image quality, and cost savings compared to a standard protocol.

Main Methods:

  • A weight-based CT protocol (100 kV, 1 mL/kg contrast) was applied to 224 patients.
  • Image quality metrics (CNR, FOM) and radiation dose were compared to a standard 120 kV, 80 mL fixed volume protocol.
  • Radiologist assessments, renal function, contrast volume, and costs were analyzed.

Main Results:

  • The optimized protocol reduced median effective radiation dose by 16% and significantly increased arterial phase CNR and FOM.
  • Radiologist evaluations confirmed no significant difference in image quality (97% agreement).
  • Contrast media usage decreased by 1,680 mL, yielding cost savings of USD 421, with no adverse impact on renal function.

Conclusions:

  • The weight-based CT protocol is a cost-efficient method for reducing radiation dose.
  • It effectively maintains contrast enhancement and image quality in multiphase CT examinations.
  • This optimized protocol offers a safer and more economical alternative for patient imaging.