Digital subtraction angiography using a temporal bandpass filter: associated patient motion properties

Area of Science:

• Medical imaging
• Radiology
• Biomedical engineering

Background:

• Digital angiography is crucial for visualizing blood vessels.
• Traditional methods like mask subtraction have limitations, especially with patient motion.
• Existing fluoroscopic X-ray systems are widely available but require optimization for advanced imaging.

Purpose of the Study:

• To describe a novel system for real-time digital angiography.
• To demonstrate the efficacy of a filtering process over mask subtraction.
• To analyze the system's performance in accommodating patient motion during intraarterial and intravenous studies.

Main Methods:

• Development of a real-time digital angiography system.
• Implementation of a filtering process for image enhancement.
• Continuous operation of fluoroscopic X-ray systems at <70 kVp and 20 mA.
• Analysis of experimental and clinical intravenous angiographic studies.

Main Results:

• Diagnostic-quality angiograms were produced using a filtering process.
• The system effectively managed image degradation from patient motion (breathing, swallowing, sudden movements).
• Certain periodic patient motions were accommodated without postprocessing.

Conclusions:

• The described filtering system offers a viable alternative to mask subtraction for digital angiography.
• Real-time angiography is achievable with existing fluoroscopic systems and the novel filtering approach.
• The system demonstrates significant potential for improving angiographic procedures by managing patient motion.