Quantitative digital subtraction arteriography with a calibration catheter

Area of Science:

• Vascular Imaging
• Medical Device Technology
• Radiology

Background:

• Accurate measurement of arterial diameters is crucial for diagnosing and managing vascular diseases.
• Digital subtraction arteriography (DSA) is a common imaging modality, but its quantitative accuracy requires validation.

Purpose of the Study:

• To evaluate the accuracy of quantitative measurements of abdominal arteries using digital subtraction arteriography (DSA).
• To assess the impact of a calibration catheter with metallic markers on measurement accuracy.

Main Methods:

• Quantitative intraarterial digital subtraction arteriography (DSA) was performed using a calibration catheter with three distal metallic ring markers.
• Measurements of 54 vessel diameters (abdominal aorta, renal, lumbar, iliac arteries) were compared against direct film arteriograms.
• Diameter measurements were performed by both human observers and computer software.

Main Results:

• Measurement deviations on DSA images ranged from 8-13% for vessels <5 mm and 2-6% for vessels >=5 mm, compared to film standards.
• Projectional artifacts contributed 3% or less error to measurements.
• The calibration catheter served as a reliable internal marker.

Conclusions:

• Quantitative DSA provides acceptable accuracy for measuring abdominal artery diameters, with variations dependent on vessel size.
• Understanding these measurement variations is essential for establishing clinical error tolerances.
• The use of a calibration catheter enhances the reliability of DSA measurements.