Dynamic CT perfusion measurement in a cardiac phantom

Area of Science:

• Cardiovascular Imaging
• Medical Physics
• Radiology

Background:

• Dynamic CT myocardial perfusion is crucial for diagnosing heart conditions.
• Current methods face challenges with accuracy and high radiation exposure.
• Novel techniques are needed to improve clinical applicability.

Purpose of the Study:

• To evaluate the accuracy of a first pass analysis (FPA) dynamic CT myocardial perfusion technique.
• To assess the potential for radiation dose reduction with the FPA technique.
• To compare FPA performance against the maximum slope model (MSM).

Main Methods:

• A pulsatile pump generated known myocardial perfusion rates (0.96-2.49 mL/min/g).
• Perfusion rates were measured using FPA and MSM with a 320-slice CT scanner.
• Results were compared to known perfusion rates determined by an ultrasonic flow probe.

Main Results:

• FPA demonstrated high accuracy (r = 0.98) with a standard error of 0.14 mL/min/g.
• MSM showed lower accuracy (r = 0.96) and a higher standard error of 0.30 mL/min/g.
• FPA required significantly lower radiation doses (2.6 mSv) compared to MSM (11.7-17.5 mSv).

Conclusions:

• The FPA technique provides accurate dynamic CT myocardial perfusion measurements.
• FPA achieves substantial radiation dose reduction (approx. 4x) versus MSM.
• FPA offers a promising, safer alternative for clinical CT perfusion imaging.