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Practical techniques for reducing radiation exposure during cerebral angiography procedures.

Monica S Pearl1, Collin Torok2, Jiangxia Wang3

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PubMed
Summary

Reducing radiation dose during cerebral angiography is possible by using fluoroscopy instead of digital subtraction angiography (DSA) for femoral artery access. Lowering pulse rates for roadmap guidance and employing variable frame rates for DSA also significantly cut radiation exposure.

Keywords:
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Area of Science:

  • Medical Imaging
  • Radiology
  • Neurointerventional Surgery

Background:

  • Digital subtraction angiography (DSA) is the gold standard for diagnosing cerebrovascular disorders like aneurysms.
  • Minimizing radiation dose in diagnostic imaging is crucial for patient safety.

Purpose of the Study:

  • To evaluate the impact of modifying DSA frame rate, fluoroscopic and roadmap pulse rates, and flat panel detector (FPD) position on radiation dose.
  • To identify strategies for dose reduction during cerebral angiography procedures.

Main Methods:

  • Adult skull and abdomen/pelvis anthropomorphic phantoms were used.
  • Radiation dose metrics (Ka,r, PKA, fluoroscopy time) were compared.
  • Modifications included fluoroscopic pulses per second (p/s), DSA frames per second (f/s), and FPD position/collimation.

Main Results:

  • DSA protocols for femoral artery access showed significantly higher doses than fluoroscopy alone.
  • Roadmaps at 3-4 p/s delivered significantly less dose compared to higher pulse rates.
  • Variable frame rate DSA protocols yielded the lowest radiation doses.

Conclusions:

  • Replacing DSA with fluoroscopy for femoral artery access can lower radiation dose.
  • Utilizing lower pulse rates for fluoroscopy and roadmap guidance is recommended.
  • Variable frame rates for DSA are effective in reducing radiation exposure during cerebral angiography.