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X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
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Radiation dose reduction at MDCT with iterative reconstruction for prenatal diagnosis of skeletal dysplasia:

Chihiro Tani1, Yoshinori Funama, Chikako Fujioka

  • 11 Department of Diagnostic Radiology, Hiroshima University, 1-2-3 Kasumi, Minamiku, Hiroshima 734-8551, Japan.

AJR. American Journal of Roentgenology
|November 22, 2014
PubMed
Abstract

Insights

Radiation dose for fetal bone evaluation using MDCT can be significantly reduced by 83% with adaptive statistical iterative reconstruction (ASIR) 90%, without compromising image quality for diagnostic purposes.

Area of Science:

  • Medical Imaging
  • Radiology
  • Pediatric Imaging

Background:

  • Multidetector computed tomography (MDCT) is crucial for fetal bone assessment.
  • Optimizing radiation dose is essential in pediatric and prenatal imaging to minimize risks.

Purpose of the Study:

  • To determine the extent of radiation dose reduction possible in fetal MDCT scans.
  • To evaluate if reduced doses impact the diagnostic quality of normal fetal bone visualization using iterative reconstruction.

Main Methods:

  • Fifteen fetal specimens were scanned using a 64-MDCT scanner at varying tube currents (50-600 mA) and 100 kVp.
  • Images were reconstructed using adaptive statistical iterative reconstruction (ASIR) 90%.
  • Fetal radiation dose was measured, and image quality was assessed by two radiologists.

Main Results:

  • Radiation dose was reduced by up to 91% compared to the 600 mA standard.
  • No statistically significant difference in image quality was found between standard dose (600 mA) and doses reduced to 100, 150, and 300 mA when using ASIR 90%.
  • A significant difference was observed only between the lowest dose (50 mA) and the standard dose.

Conclusions:

  • Fetal radiation dose can be reduced by 83% using ASIR 90% while maintaining diagnostic image quality for fetal bone evaluation.
  • Iterative reconstruction techniques like ASIR allow for substantial radiation dose reduction in fetal MDCT.
  • This facilitates safer and more efficient prenatal imaging practices.
Keywords:
fetal CTfetal radiation doseiterative reconstructionprenatal imagingskeletal dysplasia

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