Improved Coronary MRA Using Wideband SSFP at 3 Tesla with Sub-millimeter Resolution

論文發表人：李緒磊（南加州大學電機所博士班）

 

http://www.ismrm.org/08/

 

3T MRI 上的 SSFP 序列可提供冠狀動脈影像高訊噪比及高對比，然而 off-resonance 效應限制了此技術中的 TR 參數並降低可取得之空間解析度。Wideband SSFP 使用兩個不同的 TR 而產生交替出現的穩定態 (雙 TR 穩定態)，可抑制 off-resonance 並提升空間解析度。在此我們展示應用於 3T 平台之三維 navigated wideband SSFP 冠狀動脈影像，可在六分鐘內取得頻率編碼方向 0.68 毫米之空間解析度。Wideband SSFP 成功抑制 off-resonance 效應，顯示其改進在 3T 平台上高解析度無顯影劑冠狀動脈造影品質的能力。

 

Coronary artery imaging using SSFP at 3 Tesla exhibits high SNR and CNR, however off-resonance effects limit the TR and hence the achievable spatial resolution. Wideband SSFP sequences utilize an oscillating steady state to suppress off-resonance artifacts and therefore improve spatial resolution. Coronary artery images were obtained at 3T using three-dimensional navigated GRE, SSFP, and wideband SSFP sequences, with an in-plane resolution of 0.68 mm in the frequency-encoding direction. Wideband SSFP successfully suppressed banding artifacts, and is a promising approach for obtaining non-contrast, high-resolution coronary artery images at 3T with reliable image quality.