Feasibility of Free-breathing CCTA using 256-MDCT

Area of Science:

• Radiology
• Cardiovascular Imaging
• Medical Technology

Background:

• Coronary computed tomography angiography (CCTA) traditionally requires breath-holding to minimize respiratory motion artifacts.
• Advancements in CT technology, specifically wide detector scanners, may enable alternative imaging protocols.

Purpose of the Study:

• To evaluate the feasibility of performing CCTA during free-breathing using a 256-MDCT scanner with a wide detector.
• To compare the image quality, radiation dose, and heart rate variation between free-breathing and breath-holding CCTA.

Main Methods:

• Eighty patients undergoing CCTA were divided into two groups: 40 with breath-holding (Group A) and 40 with free-breathing (Group B).
• Coronary artery quality scores (1-3), image noise, signal-to-noise ratio, effective radiation dose, and heart rate variation were analyzed and compared between groups.

Main Results:

• Image noise, signal-to-noise ratio, and effective radiation dose showed no significant differences between the free-breathing and breath-holding groups.
• Heart rate variation was significantly lower in the free-breathing group (3 ± 2.6 bpm) compared to the breath-holding group (7 ± 7.6 bpm).
• Quality scores for coronary arteries were significantly better in the free-breathing group (2.85 ± 0.36) than in the breath-holding group (2.55 ± 0.64).

Conclusions:

• Free-breathing CCTA is feasible with wide detector CT scanners, providing acceptable image quality.
• This technique reduces heart rate variation and can yield superior images for certain patients.
• Free-breathing CCTA represents a viable alternative to breath-holding, potentially improving patient comfort and scan efficiency.