Related Experiment Videos
[Pulse triggering for improved diffusion-weighted MR imaging of the abdomen]
1Radiologische Klinik der Universität Bonn. muertz@imsdd.meb.uni-bonn.de
Rofo : Fortschritte Auf Dem Gebiete Der Rontgenstrahlen Und Der Nuklearmedizin
|August 30, 2000
Summary
Pulse triggering significantly reduces motion artifacts in abdominal diffusion-weighted MRI. This technique improves the accuracy and reproducibility of apparent diffusion coefficient (ADC) values, enhancing diagnostic quality.
Area of Science:
- Medical Imaging
- Radiology
- Biophysics
Context:
- Diffusion-weighted magnetic resonance imaging (DW-MRI) is crucial for abdominal diagnostics.
- Motion artifacts, particularly from cardiac and respiratory cycles, degrade image quality and diagnostic accuracy.
- Single-shot echo planar imaging (EPI) sequences are susceptible to motion due to their rapid acquisition.
Purpose:
- To investigate the efficacy of finger pulse triggering in reducing motion artifacts in abdominal DW-MRI.
- To optimize the trigger delay for single-shot EPI sequences.
- To assess the impact of pulse triggering on apparent diffusion coefficient (ADC) measurements.
Summary:
- A study involving five healthy volunteers utilized finger pulse triggering with a 1.5 T DW-MRI system.
- Diffusion-weighted images were acquired at various cardiac phases, with measurements repeated to evaluate reproducibility.
- Signal intensities and ADC values in the spleen, kidney, and liver were analyzed to quantify artifact reduction and accuracy improvements.
Impact:
- Pulse triggering significantly reduces motion artifacts, leading to more homogeneous abdominal organs on DW-MRI.
- Optimal trigger delays (500-600 ms) enhance signal intensity and improve ADC accuracy by up to tenfold compared to untriggered sequences.
- This method enhances the reproducibility of ADC measurements, with standard deviations below 12%, a fourfold improvement over non-triggered scans.