Pushing the envelope: new computed tomography techniques for cardiothoracic imaging.

Area of Science:

• Radiology and Medical Imaging
• Cardiovascular Imaging
• Thoracic Imaging

Background:

• Multidetector row computed tomography (MDCT) has evolved significantly since 1999.
• 64-slice CT systems are now standard for routine cardiothoracic CT.
• Ongoing developments address remaining challenges in cardiothoracic CT.

Purpose of the Study:

• Review key advancements influencing newer CT scanner designs.
• Highlight improvements in scan speed, radiation dose reduction, and functional imaging capabilities.
• Discuss the potential of CT in functional assessment of the heart and lungs.

Main Methods:

• Focus on three critical aspects: scan speed, radiation dose reduction, and functional imaging.
• Discuss techniques like electrocardiogram (ECG)-triggered high-pitch spiral acquisition for cardiac CT.
• Examine dose reduction strategies including ECG-controlled dose modulation and iterative reconstruction.
• Explore functional imaging techniques such as first-pass myocardial enhancement and perfusion studies.

Main Results:

• Faster scan speeds enable quicker cardiothoracic imaging, benefiting patient cooperation and expanding clinical applications.
• Advanced techniques like ECG-triggered high-pitch spiral acquisition allow for "snapshot" cardiac imaging.
• Radiation dose reduction methods are crucial due to ongoing concerns about CT radiation exposure.
• Functional imaging provides insights into myocardial enhancement and cardiac perfusion, aiding in assessing coronary artery stenosis relevance.

Conclusions:

• Newer CT scanner designs are driven by the need for faster scans, lower radiation doses, and enhanced functional imaging.
• These advancements are expanding the role of cardiothoracic CT beyond anatomical visualization.
• Functional imaging holds promise for determining the hemodynamic significance of coronary artery disease.