Multidetector computed tomography myocardial perfusion imaging during adenosine stress

Area of Science:

• Cardiovascular Imaging
• Radiology
• Medical Diagnostics

Background:

• Myocardial perfusion imaging using multidetector computed tomography (MDCT) holds promise for diagnosing and managing coronary artery disease.
• Assessing regional myocardial blood flow is crucial for understanding ischemic heart conditions.

Purpose of the Study:

• To validate the accuracy of MDCT for measuring regional myocardial perfusion differences.
• To evaluate MDCT's effectiveness during adenosine stress in a canine model with left anterior descending (LAD) artery stenosis.

Main Methods:

• Contrast-enhanced helical MDCT was performed on eight dogs with induced LAD stenosis during adenosine infusion.
• Regional signal density (SD) ratio in stenosed and remote territories was calculated and compared with myocardial blood flow (MBF) measurements obtained via microspheres.

Main Results:

• Adenosine infusion significantly reduced MBF in stenosed territories compared to remote territories (p < 0.05).
• A strong linear association was found between the SD ratio and MBF in the stenosed territory (R = 0.98, p = 0.001).
• MDCT demonstrated a significant non-linear relationship with myocardial blood flow across the studied range.

Conclusions:

• Adenosine-augmented MDCT myocardial perfusion imaging provides semiquantitative measurements of myocardial perfusion.
• This technique is validated in a canine model of LAD stenosis, supporting its potential clinical utility in assessing coronary artery disease.