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Imaging Studies I: Kidney, Ureter, and Bladder Studies01:28

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Kidney, Ureter, and Bladder (KUB) StudiesKidney, Ureter, and Bladder (KUB) studies are standard diagnostic imaging procedures used to assess the anatomy of the urinary system. They are commonly utilized for patients experiencing abdominal pain or urinary symptoms. By using a simple X-ray of the abdomen, KUB studies can reveal structural and pathological abnormalities within the kidneys, ureters, and bladder. These studies are particularly valuable in diagnosing kidney stones, urinary...
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Navigator-based slice tracking for kidney pCASL using spin-echo EPI acquisition.

Ke Zhang1,2, Simon M F Triphan1, Christian H Ziener2

  • 1Department of Diagnostic & Interventional Radiology, Heidelberg University Hospital, Heidelberg, Germany.

Magnetic Resonance in Medicine
|February 22, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a navigator-based method to reduce kidney motion during pseudo-continuous arterial spin labeling (pCASL) MRI scans. This technique improves the accuracy and detail of renal perfusion maps by minimizing respiratory-induced movement.

Keywords:
arterial spin labelingkidneynavigator-based slice tracking

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Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Renal Physiology

Background:

  • Respiratory motion significantly degrades the quality of kidney imaging, particularly in perfusion studies.
  • Pseudo-continuous arterial spin labeling (pCASL) is a valuable technique for non-invasively assessing renal perfusion.
  • Motion artifacts in pCASL can lead to inaccurate quantification and reduced diagnostic confidence.

Purpose of the Study:

  • To implement and evaluate a navigator-based slice-tracking method for prospectively compensating respiratory motion during kidney pCASL.
  • To assess the impact of this motion compensation technique on the accuracy and reliability of renal perfusion measurements.
  • To improve the visualization and analysis of renal perfusion using spin-echo (SE) echo-planar imaging (EPI) acquisition.

Main Methods:

  • A navigator acquisition using a single gradient-echo slice selection and projection readout was employed at the diaphragm level.
  • Navigator acquisition and fat suppression were integrated before each transverse imaging slice within a 2D SE-EPI pCASL sequence.
  • Real-time slice positioning adjustments were made based on motion information derived from the navigator signal, after accounting for EPI-induced signal saturation.

Main Results:

  • The navigator-based slice-tracking method effectively reduced kidney movement caused by respiration.
  • Application of motion correction led to a significant reduction in the coefficients of variation for renal perfusion values.
  • An average reduction of approximately 20% in the coefficient of variation was observed, enhancing the accuracy and detail of perfusion maps.

Conclusions:

  • The study confirms the feasibility of a navigator-based slice-tracking technique for kidney imaging using a SE-EPI readout pCASL sequence.
  • This method offers a practical approach to mitigate respiratory motion artifacts in renal perfusion imaging.
  • The demonstrated improvements in reducing motion and enhancing perfusion map quality hold significant potential for clinical applications.