Improved 3-Tesla cardiac cine imaging using wideband.

Area of Science:

• Cardiovascular Magnetic Resonance Imaging
• Medical Physics

Background:

• Cine balanced steady-state free precession (SSFP) is optimal for cardiac ventricular function assessment at 1.5 T due to high signal-to-noise ratio and contrast.
• At 3 T, SSFP is limited by susceptibility-induced off-resonance, causing banding artifacts or requiring reduced repetition time, which compromises spatial resolution.

Purpose of the Study:

• To evaluate wideband SSFP, a modified SSFP sequence, for cardiac imaging at 3 T.
• To overcome the limitations of conventional SSFP at higher magnetic field strengths.

Main Methods:

• Wideband SSFP utilizes alternating pulse repetition times to achieve a wider frequency response band.
• Prospectively gated cine 2D imaging was performed in healthy volunteers.
• Quantitative metrics and qualitative clinical interpretation were used for comparison with conventional balanced SSFP.

Main Results:

• Wideband SSFP effectively mitigates banding artifacts common in 3 T SSFP.
• This technique allows for approximately 30% higher spatial resolution compared to conventional SSFP.
• A trade-off exists between temporal resolution and signal-to-noise ratio efficiency.

Conclusions:

• Wideband SSFP is a viable alternative to conventional SSFP for cardiac imaging at 3 T.
• It offers improved spatial resolution and artifact reduction, enhancing diagnostic capabilities.