Scholarlink

Background <p>Preoperative cardiac CT for mitral valve assessment is crucial, and improvement of image quality using motion-correction algorithms remains unreported.</p> Materials and methods <p>We retrospectively analyzed 141 datasets from 47 patients with mitral regurgitation, reconstructing images acquired using a CT scanner with 16-cm z-axis coverage with prospective electrocardiography gating utilizing standard (STD), SnapShot Freeze 1.0 (SSF), and SnapShot Freeze 2.0 (SSF2) algorithms. Two radiologists blinded to reconstruction methods, cardiac cycle, and patient information evaluated image quality for mitral valve leaflets (A1-P3) using a five-point Likert scale, assessing 20 cardiac phases for the A2/P2 and systolic phases for all leaflets.</p> Results <p>Image quality scored significantly higher using SSF2 compared to STD or SSF reconstruction for all 20 cardiac phases of the A2/P2 and the systolic phase of all leaflets (<i>P</i> &lt; 0.05). STD and SSF scores did not differ significantly but were higher in atrial fibrillation than sinus rhythm, a difference not observed with SSF2. No reconstruction method showed significant correlation between heart rate and image quality. The mean systolic phase contributing most to mitral regurgitation diagnosis was 27.7% of the R-R interval. Interobserver agreement was excellent (weighted kappa = 0.956 for A2/P2; 0.915 for A1/P1, A2/P2, and A3/P3).</p> Conclusions <p>Mitral valve image quality in preoperative cardiac CT for mitral regurgitation improved significantly using SSF2 reconstruction compared to STD and SSF. Reflected across different cardiac phases and influenced by neither heart rhythm nor rate, findings suggest the robustness of SSF2 for use in various clinical scenarios and to aid surgical planning.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

SnapShot Freeze 2.0, a second-generation motion-correction algorithm, improves mitral valve image quality in preoperative cardiac computed tomography for mitral regurgitation

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月17日

查看全文
  • Hiromi Hashimura,
  • Kentaro Nishiuchi,
  • Yu Izawa,
  • Kei Honde,
  • Kazuki Ishikawa,
  • Hiroaki Takahashi,
  • Takamichi Murakami

摘要

Background

Preoperative cardiac CT for mitral valve assessment is crucial, and improvement of image quality using motion-correction algorithms remains unreported.

Materials and methods

We retrospectively analyzed 141 datasets from 47 patients with mitral regurgitation, reconstructing images acquired using a CT scanner with 16-cm z-axis coverage with prospective electrocardiography gating utilizing standard (STD), SnapShot Freeze 1.0 (SSF), and SnapShot Freeze 2.0 (SSF2) algorithms. Two radiologists blinded to reconstruction methods, cardiac cycle, and patient information evaluated image quality for mitral valve leaflets (A1-P3) using a five-point Likert scale, assessing 20 cardiac phases for the A2/P2 and systolic phases for all leaflets.

Results

Image quality scored significantly higher using SSF2 compared to STD or SSF reconstruction for all 20 cardiac phases of the A2/P2 and the systolic phase of all leaflets (P < 0.05). STD and SSF scores did not differ significantly but were higher in atrial fibrillation than sinus rhythm, a difference not observed with SSF2. No reconstruction method showed significant correlation between heart rate and image quality. The mean systolic phase contributing most to mitral regurgitation diagnosis was 27.7% of the R-R interval. Interobserver agreement was excellent (weighted kappa = 0.956 for A2/P2; 0.915 for A1/P1, A2/P2, and A3/P3).

Conclusions

Mitral valve image quality in preoperative cardiac CT for mitral regurgitation improved significantly using SSF2 reconstruction compared to STD and SSF. Reflected across different cardiac phases and influenced by neither heart rhythm nor rate, findings suggest the robustness of SSF2 for use in various clinical scenarios and to aid surgical planning.