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Effects of Gadolinium Chelate Administration Timing on T2-weighted and Diffusion-weighted Abdominal MRI Examination:

Su-Lan Jia1, Hui Xu2, Da-Wei Yang2

  • 1Department of Radiology, Daxing Teaching Hospital, Capital Medical University, Beijing, 102600, China.

Current Medical Imaging
|November 4, 2024
PubMed
Abstract

Insights

Optimizing Magnetic Resonance Imaging (MRI) scan timing by administering gadolinium contrast post-sequence reduces abdominal scan duration. This approach maintains image quality for liver, spleen, and pancreas but requires pre-contrast imaging for kidney assessment.

Area of Science:

  • Radiology
  • Medical Imaging
  • Diagnostic Imaging

Background:

  • Magnetic Resonance Imaging (MRI) acquisition sequences can be optimized to reduce scan times.
  • Gadolinium-based contrast agents are frequently used in MRI to enhance image quality and diagnostic information.

Purpose of the Study:

  • To evaluate the effect of gadolinium chelate administration timing on scan duration and image quality.
  • To compare Diffusion-weighted Imaging (DWI) and T2-weighted Imaging (T2WI) quality pre- and post-gadolinium contrast in abdominal MRI.

Main Methods:

  • Prospective study comparing conventional (pre- and post-contrast) and optimized (post-contrast only) MRI protocols.
  • Quantitative analysis of Signal-to-noise Ratio (SNR), Contrast-to-noise Ratio (CNR), and Apparent Diffusion Coefficient (ADC).
  • Assessment of hepatic lesion detectability and inter-observer agreement using Kappa statistics.

Main Results:

  • Optimized group scan duration was significantly shorter (1,015 s vs. 1,304 s) than the conventional group (p<0.05).
  • No significant changes in SNR and ADC for liver, spleen, and pancreas in post-contrast DWI/T2WI (p>0.05).
  • Significant decreases in kidney SNR and ADC observed post-contrast (p<0.05); hepatic lesion detectability remained unchanged.

Conclusions:

  • Post-gadolinium administration of DWI and T2WI sequences shortens abdominal MRI scan time without compromising image quality for the liver, spleen, and pancreas.
  • Kidney assessment using DWI and T2WI should be performed before gadolinium administration to maintain image quality.
Keywords:
Diffusion-weighted imagingGadolinium.Hepatic imagesKidney imagesMagnetic resonance imagingT2-weighted images

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